National Service Change Notices and Public Statements

When NWS proposes or finalizes changes to products or services, this page is updated and official notices are sent out on the NOAA Weather Wire Service (NWWS), the Emergency Managers Weather Information Network (EMWIN) and NOAAPort.

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• Service Change Notices
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Public Information Statements 2020

• Dec 15: PNS20-78 Updated: Soliciting comments through January 15, 2021,  on a proposal to add polygons to Non-Weather Emergency  Messages (NWEM) disseminated by NWS in World  Meteorological Organization (WMO) text products
• Dec 11: PNS20-91: Soliciting Comments on Experimental Graphical Forecasts for Aviation over Alaska through September 30, 2021
• Dec 8: PNS20-90: Soliciting comments through January 7, 2021, on the discontinuance of certain short-fused NWS warning update statements
• Dec 8: PNS20-89: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to take place on December 10, 2020
• Dec 7: PNS20-88: NWS to issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on December 8, 2020
• Nov 20: PNS20-87: Soliciting Comments through December 20, 2020, on the Discontinuation of the Collaborative Nearshore Swell and Wind Forecast for Oahu 
• Nov 19: PNS20-86: Soliciting public comments through December 19, 2020, on proposed changes to MRMS products available on SBN and the removal of binary products from the MRMS system
• Nov 18: PNS20-85: Seeking Comments on Proposed Changes to  User Access of NCEP Web Services through December 18, 2020
• Dec 11: PNS20-84 Updated: Soliciting comments on the Experimental Avalanche Weather Guidance product through April 30, 2021
• Nov 13: PNS20-83: Soliciting comments on the use of NWS frost and freeze  products and services through December 17, 2020
• Nov 10:  PNS20-82: National Tsunami Warning Center Routine Communications  Tests for the West Coast and Alaska Coast to take place on November 13, 2020
• Nov 10: PNS20-81: Soliciting comments on the proposed transition of LAMP  and GLMP products from TGFTP to NCEP web services  through December 10, 2020
• Nov 10: PNS19-33 Updated: Extending the status of the Experimental  Beach Forecast Webpage and the Experimental Rip Current Risk Graphic until a new NWS GIS viewer is implemented at a date to be determined
• Nov 6: PNS20-80: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on November 10, 2020
• Nov 2: PNS20-79: Seeking Public Comment on the Prototype Instagram Social Media Service through June 8, 2021
• Dec 15: PNS20-78 Updated: Soliciting comments through January 15, 2021,  on a proposal to add polygons to Non-Weather Emergency  Messages (NWEM) disseminated by NWS in World  Meteorological Organization (WMO) text products
• Oct 27: PNS20-77: Soliciting Comments on a Format Change to the Rangeland Fire Danger Forecast Issued by WFO Corpus Christi through December 4, 2020
• Oct 6: PNS20-76: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on October 8, 2020
• Oct 6: PNS20-75: Soliciting Comments on Proposed Changes to the Extreme Wind Warning (EWW) Text Product to Align with Impact-Based Warning (IBW) Format through November 23, 2020
• Oct 6: PNS20-74: Soliciting Comments on Discontinuing the Satellite-Derived Tropical Rainfall Estimate Text Product through November 23, 2020
• Oct 6: PNS20-73: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on October 6, 2020
• Oct 5: PNS20-72: Soliciting Comments on Discontinuing Temperature and Precipitation Table Product for Tennessee through October 29, 2020
• Nov 3: PNS20-71 Updated: Known Bugs Introduced into National Blend of Models (NBM) v4.0 Implementation Tuesday, November 3, 2020
• Oct 2: PNS20-70 Updated: Soliciting Comments through October 30, 2020 for Potential Changes to Tsunami Advisory Text Product Formats
• Oct 2: PNS20-69 Corregido: Se solicitan comentarios hasta el 30 de Octubre de 2020 para posibles cambios en el formato de los productos de texto de Advertencia de Tsunami
• Sep 25: PNS20-68: Network Maintenance on September 28, 2020 to Affect Dissemination of Tsunami Products
• Sep 24: PNS20-67: Soliciting Comments through October 30, 2020, for Potential Changes to Tsunami Advisory Text Product Formats
• Sep 22: PNS19-36 Updated: Soliciting Comments on Experimental Winter Storm Outlook through May 15, 2021
• Sep 16: PNS20-66: Soliciting Comments through October 30, 2020 on Proposal to Change High Surf Advisory to a Plain-Language Statement
• Sep 8: PNS20-65: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on September 10, 2020
• Sep 4: PNS20-64: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on September 8, 2020
• Aug 26: PNS20-63: Soliciting Comments through September 30, 2020 on a Proposal to Terminate the Automated Flood Warning System (AFWS) Webpage
• Aug 24: PNS20-62: Soliciting Comments on the Proposed Upgrade of LAMP and Gridded LAMP Guidance through September 23, 2020
• Aug 20: PNS20-61: Anchorage Federal Building Power Outage will Affect NWS Operational Data Effective Saturday, August 22, 2020
• Aug 5: PNS20-60: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on August 7, 2020
• Aug 4: PNS20-59: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to take place on August 6, 2020
• Jul 27: PNS20-58: Hurricane Threats and Impacts (HTI) Mosaic Testing on July 28, 2020
• Jul 24: PNS20-57: Soliciting Comments on the Use of the Zone Forecast Product (ZFP) through August 19, 2020
• Jul 20: PNS20-56: Spanish-Language Survey Now Available as NWS Solicits Comments through August 21, 2020 on Proposed Major Changes to the NWS Watch, Warning, and Advisory (WWA) System
• Jul 15: PNS20-55: Soliciting Comments through August 17, 2020 on a Proposal to Implement Partial County Alerting via NWR and the EAS for Clark County, NV
• Jul 10: PNS20-54: The Second ICAO APAC Volcanic Ash Exercise, Named APAC VOLCEX 20/02, is Scheduled for July 16, 2020 and will Include the Honolulu Meteorological Watch Office, the Washington Volcanic Ash Advisory Center, and Center Weather Service Unit Oakland
• Jul 8: PNS20-53: Seeking Public Comment on the Proposed Impact-Based Reformatting of NWS Special Weather Statements and Added Issuance Phenomena through August 6, 2020
• Jul 6: PNS20-52: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on July 9, 2020
• Jul 6: PNS20-51: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on July 8, 2020
• Jul 2: PNS20-50: Seeking comments through August 2, 2020, on on proposed replacement of RIDGE I Radar Webpage with RIDGE II Radar Webpage
• Jun 30: PNS20-49: Seeking Public Comment through July 30, 2020 on the Proposed Use of Impact-Based Damage Threat Categories in NWS Severe Thunderstorm Warnings
• Jun 26: PNS20-48: Soliciting Comments on the Upgrade of the National Water Model to Version 2.1 through August 5, 2020
• Jun 26: PNS20-47: Soliciting Comments on Removing Certain Products from the Proposed Upgrade of the Nearshore Wave Prediction System through July 26, 2020
• Jun 23: PNS20-46: National Tropical Cyclone Watch Warning Product (TCV) Collaboration Testing on June 24, 2020
• Jun 18: PNS20-45: Anchorage Federal Building Power Outage will Affect NWS Operational Data Effective Saturday, June 20, 2020
• Jun 17: PNS20-44: Soliciting Comments on the Proposed Upgrade of the GFS through August 31, 2020
• Jun 11: PNS20-43: Soliciting Comments through August 21, 2020 on Proposed Major Changes to the NWS Watch, Warning, and Advisory (WWA) System
• Jun 8: PNS20-42: Soliciting Public Comments on the Removal of Certain gaugeQC Products through July 8, 2020
• Jun 8: PNS20-41: Soliciting Public Comments on Changing the Product Suite from the Proposed Upgrade of the Real Time Ocean Forecast System (RTOFS) Global Model through July 8, 2020
• Jun 8: PNS20-40: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on June 11, 2020
• Jun 8: PNS20-39: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on June 12, 2020 
• Jun 3: PNS20-38: Soliciting Comments on the Proposed Upgrade of the Nearshore Wave Prediction System through July 15, 2020
• Jun 1: PNS20-37: NWS is Soliciting Feedback from Specified Partner Sectors on their Use of NWS Tropical Products and Services through June 30, 2021
• May 20: PNS20-36: Soliciting Comments through November 30, 2020 on an Experimental Graphic Depicting the Peak Storm Surge Forecast from the Tropical Cyclone Public Advisory Product when Storm Surge Watch/Warnings are in Effect
• May 20: PNS20-35: Announcing Partner Webinars in June and July 2020 on Proposed Major Changes to the NWS Watch, Warning and Advisory (WWA) System
• May 18: PNS20-34: Seeking Public Comment and Review on Additions to Experimental Severe Weather Impact Graphics through April 30, 2021 for Contiguous U.S. Only
• May 14: PNS20-33: Soliciting Public Comments on the Removal of Products from the Global Wave Deterministic Forecast System (Multi_1) through June 13, 2020
• May 14: PNS20-32: Soliciting Public Comments on the Proposed Upgrade of the RTOFS Global Model through June 15, 2020
• May 12: PNS20-31: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on May 14, 2020
• May 8: PNS20-30: NWS to issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on May 12, 2020
• May 7: PNS20-29: National Safe Boating Week: May 16-22, 2020
• May 1: PNS20-28: Soliciting Comments on the Prototype National Water Model Visualization Services through August 1, 2020
• Apr 28: PNS20-27: Soliciting Comments on Discontinuing Temperature and Precipitation Table Product for Florida through May 29, 2020
• Apr 22: PNS20-26: Soliciting Comments on Proposed Changes to Wireless Emergency Alert (WEA) Wording for Snow Squall Warnings until July 1, 2020
• Apr 21: PNS20-25: Soliciting Public Comments on the Proposed Upgrades to the P-ETSS and ETSS Models through May 22, 2020
• Apr 21: PNS20-24: Soliciting Comments about an Upgrade of the High Resolution Ensemble Forecast (HREF) System through June 24, 2020
• Apr 20: PNS20-23: Hurricane Threats and Impacts (HTI) Mosaic Testing on April 21, 2020 (Backup Date April 22)
• Apr 20: PNS20-22: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on April 21, 2020
• Apr 13: PNS20-21 Updated: Soliciting Public Comments on Prototype Point Forecast Display through May 15, 2020
• Apr 7: PNS20-20: Soliciting Public Comments on the Removal of Products from the Global Wave Ensemble Forecast System (GWES) through May 7, 2020 
• Apr 6: PNS20-19: Soliciting Public Comments on the Proposed Upgrade of the ESTOFS Global Extratropical Surge and Tide Operational Model through July 7, 2020
• Apr 3: PNS20-18: Soliciting Comments on the Termination of the San Francisco Marine Stratus Forecast System through May 3, 2020
• Apr 1: PNS20-17: Soliciting Public Comments on the Removal of Products from the Global Forecast System (GFS) through April 30, 2020
• Apr 1: PNS20-16: Soliciting Comments on the Upgrade of the National Blend of Models Guidance through May 22, 2020
• Mar 31: PNS20-15: Soliciting Public Comments on the Proposed Upgrade of Hurricane Weather and Research Operational Model through April 14, 2020
• May 18: PNS20-14 Updated: Soliciting Comments on Proposal to Change Small Craft Advisory to Small Craft Warning through June 30, 2020
• Mar 24: PNS20-13: Soliciting Public Comments on the Proposed Upgrade of the HMON Hurricane Operational Model through April 7, 2020
• Mar 24: PNS20-12 Updated: The National Tsunami Warning Center National East Coast Exercise LANTEX20 has been Postponed until Further Notice
• Mar 20: PNS20-11: Soliciting Comments through May 19, 2020 on Potential Changes to Headlines Used in the El Niño/Southern Oscillation (ENSO) Alert System
• Mar 17: PNS20-10 Updated: Postponed Test Dissemination of High Seas Forecast for the North Atlantic Tuesday, March 17, 2020
• Mar 9: PNS20-09: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on March 12, 2020
• Mar 9: PNS20-08: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on March 10, 2020
• Mar 4: PNS20-07: Soliciting Comments on the Changes to Product Timeliness Associated with Upgrade of Global Ensemble Forecast System Version 12.0 Model Implementation through April 14, 2020
• Mar 3: PNS20-06: Soliciting Comments on the Termination of the Model Diagnostic Discussion (PMDHMD) and 500-mb Height Preference Graphics through April 14, 2020
• Jun 3:  PNS20-05 Updated: Experimental Period for the 7-day Expansion of the National Fire Danger Rating System (NFDRS) Forecast Product (FWM) Effective March 2, 2020 through August 31, 2020
• Feb 20: PNS20-04: Soliciting Comments on the Termination of the Ceiling and Visibility Analysis Static Imagery on or around March 31, 2020
• Feb 11: PNS20-03: New Training Resource: The Weather, Water, and Climate Enterprise: Enhancing Science, Service and Partnerships for a Weather-Ready Nation Available Now
• Jan 23: PNS20-02: Soliciting Comments through February 22, 2020 on Proposal for Provisioning of NWS Data in Geospatial Form
• Jan 16: PNS20-01: Soliciting Comments until February 20, 2020 on Discontinuing the National Hurricane Center Spanish Translation of the Tropical Cyclone Discussion for the Atlantic Basin

• Nov 10: PNS19-33 Updated: Extending the status of the Experimental  Beach Forecast Webpage and the Experimental Rip Current Risk Graphic until a new NWS GIS viewer is implemented at a date to be determined
• May 18: PNS19-24 Updated: Soliciting Comments on Experimental Provision of Wet Bulb Globe Temperature (WBGT) Grids in the NDFD through September 30, 2020
• Apr 9: PNS19-15 Updated: Soliciting Comments on the Experimental Tropical-Storm-Force Winds Timing Base Data through November 30, 2020
• Mar 30: PNS19-01 Updated: Soliciting Public Comments through April 1, 2021 on Experimental Probabilistic Flood Outlook Summary
• Apr 30: PNS19-02 Updated: Soliciting Comments until April 30, 2021 on Addition of Probabilistic Snow Grids for Select WFOs as an Experimental Element in NDFD for CONUS
• May 5: PNS15 Updated: Comment Period Extended through April 30, 2021 on the Experimental Lake Effect Snow (LES) Warning Polygons from NWS WFOs Buffalo, NY, Binghamton, NY, Albany, NY, and Cleveland, OH
• May 27: PNS15 Updated: Soliciting Comments until April 30, 2021 on the Days 3-7 Winter Storm Threat Index from NWS Weather Forecast Offices (WFOs) Baltimore/Washington, DC, State College, PA, and Wakefield, VA 
• Jun 29: PNS20-14 Updated: Soliciting Comments on Proposal to Change Small Craft Advisory to Small Craft Warning through August 31, 2020
• Mar 5: PNS14 Updated: Soliciting Comments until April 30, 2021 on the Continuation of the Probabilistic Winter Precipitation Forecast Experiment Beginning Immediately

Public Information Statements 2019

• Dec 17: PNS19-39: Soliciting Comments through January 17, 2020 on the Addition of 60-hour Tropical Cyclone Forecasts When Applicable
• Dec 3: PNS19-38: Soliciting Comments on the Experimental Probabilistic Quantitative Precipitation Forecast (PQPF) Graphics through July 1, 2020
• Dec 2: PNS19-37: Soliciting Public Comments on the Removal of Products from the Global Ensemble Forecast System (GEFS) through December 31, 2019
• Sep 22, 2020: PNS19-36 Updated: Soliciting Comments on Experimental Winter Storm Outlook through May 15, 2021
• Oct 17: PNS19-35 Updated: Soliciting Comments on the Experimental Enhanced Helicopter Emergency Medical Services Tool through January 17, 2020
• Oct 17: PNS19-34: NWS is Soliciting Comments/Feedback on a new Experimental Product, Alaskan Aviation Guidance (AAG), from October 17, 2019 through October 16, 2020
• Oct 15: PNS15 Updated: Continuing Experimental Status of Offshore and High Seas Gridded Forecast in the Pacific Basin through June 30, 2020
• Oct 15: PNS19-33: Soliciting Comments on Experimental Beach Forecast Webpage and Rip Current Risk Graphic through April 1, 2020
• Oct 10: PNS19-32: NWS is Soliciting Comments through May 15, 2020 on the Proposed Implementation of U.S. Meteorological Information  Exchange Model (IWXXM) Data Format to Report Aviation Weather Information
• Oct 10: PNS19-31: Soliciting Comments on Proposed Changes to Wireless Emergency Alert (WEA) Wording for Flash Flood Warnings until November 10, 2019
• Oct 4: PNS17-03 Updated: Soliciting Comments until April 15, 2020 on the Experimental Winter Storm Severity Index (WSSI)
• Sep 26: PNS19-30: Soliciting Comments on Experimental Graphical Forecasts for Aviation for the Pacific Ocean through December 31, 2019
• Sep 19: PNS19-29: Soliciting Comments on the Experimental Water Information Interface Webpage until December 31, 2019 
• Sep 19: PNS19-28: Comments Sought on Proposed Implementation of International Civil Aviation Organization Mandated Space Weather Advisory Products by October 1, 2019
• Sep 17: PNS19-27: Soliciting Public Comments on the Removal of the DMSP/SSM/I Neural Net 3 Product on NOAAPORT and GTS through October 18, 2019
• Sep 17: PNS19-26: Seeking Comments on the Termination of NWSTG TUA to BUFR Conversion through October 16, 2019
• Sep 11: PNS19-25: Notifying of Users of the Opportunity to Submit Comments on the Proposed Termination of U.S. Coast Guard Medium Frequency Broadcast of NAVTEX and Shift to Satellite through November 12, 2019
• May 18, 2020: PNS19-24 Updated: Soliciting Comments on Experimental Provision of Wet Bulb Globe Temperature (WBGT) Grids in the NDFD through September 30, 2020
• Aug 23:  PNS19-23: Soliciting Comments on Experimental Provision of Lightning Climatology through March 31, 2020
• Jul 24: PNS19-22: Nationwide Emergency Alert System Test Scheduled for August 7, 2019
• Jul 3: PNS19-21: Soliciting Comments on Discontinuing the Text Only River Forecast and Daily River Text Products in Alaska until August 2, 2019 
• Jun 26: PNS19-20: Opportunity to Participate in Partner Webinars on July 24 and July 25, 2019 on Possible Changes to the NWS Watch, Warning and Advisory (WWA) System
• Jun 6: PNS19-19 Updated: Soliciting Comments on Experimental Modernized Open Lakes Forecast for the Great Lakes through November 30, 2019
• Jun 4: PNS19-18: Soliciting Comments on the Upgrade of Experimental National Blend of Models Guidance through August 31, 2019
• May 30: PNS19-17: National Tropical Cyclone Watch Warning Product Collaboration Tests June 3-6, 2019
• May 29: PNS19-16: Soliciting Comments on the Experimental Tropical Cyclone JavaScript Object Notation File May 31, 2019 through November 30, 2019
• May 29: PNS19-15: Soliciting Comments on Changes to the Experimental Arrival of Tropical-Storm-Force Winds Base Data May 31, 2019 through November 30, 2019
• May 22: PNS19-14: Soliciting Comments on the Experimental Nearshore Wave Prediction System (NWPS) Gulf Stream Forecast Guidance Webpage for WFO Miami, FL, through December 31, 2019
• May 17: PNS19-13: Soliciting Comments through June 30, 2019 on the Use of Impact-Based Warning Format for Flash Flood Warnings
• May 16: PNS19-12: Updated Data-Feed for Experimental ETSS and P-ETSS Websites Effective May 28, 2019
• May 11: PNS19-11: National Safe Boating Week: May 18-24, 2019
• May 10: PNS19-10: National Tropical Cyclone Watch Warning Product (TCV) Product Collaboration Tests to Run May 13-16, 2019
• May 6: PNS19-09: Update on GFS Version 15.1 Model Implementation Effective May 6, 2019
• May 1: PNS19-08: Soliciting Comments on Discontinuing the Alaska Pacific River Forecast Center (APRFC) Hydrometeorological Discussion (HMD) Text Product through May 31, 2019
• Dec 30: PNS19-07 Updated: Removal of Redbook Graphics, GIF Images, Fax Charts, AFOS Products and Bulletins Effective December 30, 2019
• Apr 5: PNS19-06: Soliciting Comments on the Termination of Products Generated from the Guantanamo Bay, Cuba ARSR-4 Radar through May 9, 2019
• Mar 20: PNS15 Updated: Comment Period Extended until April 18, 2019, for the Experimental Gate Forecast
• Mar 14: PNS19-05: Soliciting Comments on Experimental use of Facebook Live and Periscope Social Media Applications Effective April 1 through June 30, 2019 
• Mar 8: PNS19-04: Change of GOES-W Mesoscale Domain Sector 2 Default Center Position on March 5, 2019
• Mar 7: PNS19-03: Expansion of Offices and Solicitation of Comments for the Experimental Enhanced Hazardous Weather Outlook through June 30, 2019
• Mar 5: PNS19-02 Updated: Soliciting Comments until April 30, 2021 on Addition of Probabilistic Snow Grids for Select Weather Forecast Offices (WFOs) as an Experimental Element in the National Digital Forecast Database (NDFD) for the Contiguous United States (CONUS)
• Feb 19: PNS19-01: Seeking Public Comment and Review on a Prototype Probabilistic Flood Outlook Summary through May 31, 2019

Public Information Statements 2018

• Dec 20: PNS14 Updated: Soliciting Comments until April 30, 2019 on the Expansion of the Probabilistic Winter Precipitation Forecast Experiment Beginning Immediately
• Dec 20: PNS17-03 Updated: Soliciting Comments until April 30, 2019 on the Experimental Winter Storm Severity Index
• Dec 19: PNS18-36: NWS Planning to Disseminate Blue Alerts at a Date to be Determined
• Dec 14: PNS18-35: Soliciting Comments on the Termination of WSR-88D Product 171 on or around February 28, 2020
• Dec 14: PNS18-34: Soliciting Comments on the Termination of TDWR Products on or around June 28, 2019
• Nov 30: PNS18-33: Soliciting Public Comment through December 31, 2018 on Proposed 360 Character NWS Messages for Select Weather Warnings Carried by WEA
• Nov 15: PNS18-32: Soliciting Comments on Experimental Graphical Forecasts for Aviation for the Gulf of Mexico, Caribbean Sea and Western North Atlantic Ocean through December 31, 2018
• Nov 6: PNS18-31: Soliciting Comments on the Termination of the GEFS MOS Product (MEN) and GMOS/MOSGuide through December 31, 2018
• Oct 19: PNS18-30: Comments Solicited on Addition of Snow Level Grids for Select CONUS WFOs as an Experimental Element in the NDFD through April 30, 2019
• Oct 16: PNS18-29: NWS Hazard Simplification (Haz Simp) Project: Soliciting Public Comments through November 10, 2018 on Proposed Consolidation of NWS Winter Precipitation Warning Products
• Sep 15: PNS18-28: Soliciting Comments on NWS Provision of Avalanche Information through October 31 2018
• Sep 17: PNS18-26 Updated: Nationwide Wireless Emergency Alert and Emergency Alert Systems Tests Scheduled for October 3, 2018
• Sep 13: PNS18-27: Alerting Partners to the Potential for Non-Sequential Tropical Cyclone (TC) Storm Numbering in the Atlantic Basin effective immediately
• Aug 31: PNS18-25: Soliciting Comments on the Experimental Lake Erie Harmful Algal Bloom Webpage Hosted by WFO Cleveland through October 31, 2018
• Aug 28: PNS18-24: Soliciting Comments on Experimental Graphics Provided by the CPHC for Tropical Cyclones in the South Pacific Basin Based on Forecasts Issued by the JTWC through December 31, 2018
• Aug 23: PNS18-23: Soliciting Comments through September 26, 2018, on Changes to VTEC and Event Tracking Numbers (ETN) for Domestic Tsunami Test Products
• Aug 8: PNS18-22: NWS Hazard Simplification Project: Collecting Public Comment on the Proposed Consolidation and Reformatting of NWS Flood Hazard Messaging Products through September 7, 2018
• Aug 6: PNS18-21: National Tropical Cyclone Watch Warning Product (TCV) Product Collaboration Tests August 6-10, 2018
• Jul 31: PNS18-20: Soliciting Comments on Proposed Format Change to the Surf Zone Forecast through August 31, 2018
• Jul 16: PNS18-19: Soliciting Comments on the Annotated Outline of NOAA's Subseasonal and Seasonal Forecasting Innovation: Plans for the 21st Century, a Report to Congress though August 10, 2018
• Jul 2: PNS18-18: Soliciting Comments on an Experimental Arrival of Tropical-Storm-Force Winds Base Data through November 30, 2018
• Jun 15: PNS18-17: NWS Test of Fixed Grid Mapped Geostationary Operational Environmental Satellite-16 (GOES-16) Imagery, June 14-15, 2018
• Jun 8: PNS18-16: NOAAPort/SBN Earth Station – Registration of Earth Station Receive Antenna(s)
• May 21: PNS18-14: Soliciting Comments on the Proposed Upgrade of the RTMA/URMA/RTMA-RU through June 18, 2018
• May 17: PNS18-13: Soliciting Comments on Proposed Termination of County-based Flash Flood Guidance (FFG) at All Locations through June 30, 2018
• May 17: PNS18-12: National Tropical Cyclone Watch Warning Product (TCV) Product Collaboration Tests May 21-24, 2018
• May 15: PNS18-11: NWS Hazard Simplification (Haz Simp) Project: Soliciting Public Comments through June 15, 2018 on Proposed Consolidation and Reformatting of NWS Non-Precipitation Weather Hazard Products
• May 14: PNS18-10: National Safe Boating Week: May 19-25, 2018
• May 11: PNS18-08 Updated: Comment Period Extended through June 30, 2018 on the Proposed Termination of the NWS Hydrologic Information Center (HIC) Website
• May 8: PNS18-09: Science Improvements to the Suomi National Polar-orbiting Partnership (S-NPP) Satellite's NUCAPS Atmospheric Soundings Products Effective May 3, 2018
• Apr 27: PNS18-07: Changes to Section E of the Post Tropical Cyclone Report (PSH) Noted in the 2018 Version of NWSI 10-601 Will Be Delayed Until Further Notice
• Apr 26: PNS18-06: Soliciting Comments on PQPF Graphics from May 1, 2018 through March 1, 2019
• Apr 2: PNS18-05: Soliciting Public Comments on the Proposed Upgrade of the CMAQ through Apr 13, 2018
• Mar 27: PNS18-04 Updated: Soliciting Comments through June 30, 2018, on Proposed Enhancements to the Alaska River Ice Breakup Map
• Mar 21: PNS18-03: Soliciting Public Comments on the Proposed Upgrade of HWRF and HMON Operational Models through April 12, 2018
• Mar 15: PNS18-02: Soliciting Comments on the Upgrade of Experimental National Blend of Models Guidance through June 27, 2018
• Mar 13: PNS18-01 Updated: Soliciting Public Comments on the Proposed Upgrade of the NLDAS Operational System through April 09, 2018

For older PNS, SCNs (and TINs), go to https://www.weather.gov/notification/archive

Services Change Notices 2020

• Dec 15: SCN20-117: Static Radar Image Files Temporarily Suspended on EMWIN Services, Effective December 16, 2020
• Dec 14: SCN20-116: The Nearshore Wave Prediction System (NWPS) Update v1.3  Effective on or about January 13, 2021
• Dec 10: SCN20-115: Storm Prediction Center Probabilistic Day 3-8 Fire Weather Outlooks will transition to Operational Status effective on or about February 23, 2021
• Dec 9: SCN20-114: NWS Upper Air Observations Resume at Simpson Bay, St. Maarten as of November 17, 2020
• Dec 4: SCN20-113: The U.S. National Ice Center (USNIC) is  transitioning to a new website (usicecenter.gov) effective December 7, 2020
• Nov 23: SCN20-112: Termination of gaugeQC Products Effective January 5, 2021
• Nov 20: SCN20-111: IP Address Changes to NWSChat and NOAA Weather Wire   Service Open Interface on or about February 18, 2021
• Nov 18: SCN20-110: Changes to River Forecast (RVF) Products issued by Middle Atlantic River Forecast Center effective January 27, 2021
• Nov 16: SCN20-109: Operational implementation of the 7-day extension for the National Fire  Danger Rating System (NFDRS) forecast product (FWM) effective December 31, 2020
• Nov 16: SCN20-108: The Special Avalanche Bulletin (SAB) will become  authorized for use at additional Weather Forecast Offices (WFO) effective December 16, 2020
• Nov 12: SCN20-107: New Damage Assessment Toolkit (DAT) effective November 20, 2020
• Dec 4: SCN20-106 Updated: Probabilistic Extra-Tropical Storm Surge (P-ETSS) model upgrade and Extra-Tropical Storm Surge (ETSS) model upgrade effective January 12, 2021
• Nov 6: SCN20-105: Upgrade to Real-Time Ocean Forecasting System (RTOFS) Effective December 8, 2020
• Nov 6: SCN20-104: Deactivation of Legacy GINI Global Multi-Satellite Geostationary Imagery Composite Products from the NOAAPort/SBN Effective December 10, 2020
• Nov 3: SCN10-103: Termination of "Minutes to Skin Damage" Information Provided on UV Index 58 City Graphic Effective December 3, 2020
• Nov 2: SCN20-102: Planned Power Outage at NWS Silver Spring Headquarters for Emergency Building Maintenance November 5, 2020
• Nov 2: SCN20-101 Updated: Immediate Cessation of ASOS Weather Observations and Climate Products for Campo, California (KCZZ)
• Nov 2: SCN20-100: Geospace Model (SWMF) Upgraded to Version 2.0 Effective December 3, 2020
• Oct 29: SCN20-99: Changes to LAMP Station-Based and Gridded Guidance Effective January 12, 2021
• Oct 28: SCN20-98: Improved Aurora Forecasts at the Space Weather Prediction Center Effective October 28, 2020
• Nov 6: SCN20-97 Updated: Upgrade Current Icing Product Effective December 8, 2020
• Oct 21: SCN20-96: Network Maintenance on October 22, 2020 to Affect Dissemination of Tsunami Products
• Oct 21: SCN20-95: Temporary Addition of Select RAP Fields to NOAAPort Effective Date: October 22 and November 10, 2020
• Oct 19: SCN20-94: Outage of some NWS Products on SBN/NOAAPort/NWS ftp Server and Delivered to the FAA Due to Planned Maintenance Effective Date: October 22, 2020
• Oct 20: SCN20-93 Updated: Outage of NOMADS Website for Planned Maintenance Effective Date: October 22, 2020 
• Oct 13: SCN20-92: Native Unsigned Datatypes in GOES-16 L2 Products on the Satellite Broadcast Network Effective November 12, 2020
• Oct 26: SCN20-91 Updated: NOAAPort / Satellite Broadcast Network (SBN) National Blend of Models (NBM) Dissemination Test on October 27, 2020
• Sep 29: SCN20-90: Addition of Air Quality Alerts for Smoke Effective September 29, 2020 in Central and Western Wyoming
• Oct 23: SCN20-89 Updated: Implementation of the Extratropical Surge and Tide Operational Forecast System Global (ESTOFS-Global) Effective November 24, 2020
• Sep 24: SCN20-88: Regional Geoelectric Model Upgraded to 3D-Empirical at the Space Weather Prediction Center Effective September 24, 2020
• Sep 17: SCN20-87: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Quillayute, WA, on or about October 27, 2020
• Sep 21: SCN20-86 Updated: Outage of Some NWS Products on SBN/NOAAPort and NWS Web Services for Planned Maintenance
• Nov 24: SCN20-85 Updated: Replacement of RIDGE I radar with RIDGE II  Radar Web Page Effective on or about December 16, 2020
• Sep 11: SCN20-84: Add Loop Heat Pipe Metadata to GOES-R ABI Imagery on the Satellite Broadcast Network (a.k.a., NOAAPort), Effective September 2, 2020
• Sep 8: SCN20-83: Add GOES-17 ASOS Satellite Cloud Product to the Satellite Broadcast Network (SBN or NOAAPort) on or after September 28, 2020
• Sep 2: SCN20-82: NWS Upper Air Station in International Falls, MN to Use GPS Lockheed Martin LMS-6 403 MHz Radiosonde with the Lockheed Martin Groundstation (LMG) Starting on or about October 11, 2020
• Aug 28: SCN20-81: Probabilistic Tropical Cyclone Storm Surge (P-Surge) Model Upgrades: Effective September 29, 2020
• Oct 27: SCN20-80 Updated: The Winter Storm Severity Index for 116 Weather Forecast Offices across the CONUS Became Operational Effective September 29, 2020
• Aug 26: SCN20-79: Discontinuation of the Hourly Weather Roundup Text Product and Replace with the Regional Weather Roundup Text Product for WFO Corpus Christi, TX, Effective October 1, 2020
• Aug 31: SCN20-78 Updated: Upgrade of National Blend of Models Guidance Effective September 29, 2020
• Sep 22: SCN20-77 Updated: NOAAPort/Satellite Broadcast Network (SBN) Channel Realignment and Re-Prioritization Effective September 22, 2020
• Aug 24: SCN20-76: Datum Revised for Upper Air Release Point at Green Bay, Wisconsin
• Aug 20: SCN20-75: Announcement of Upgrade to the Global Ensemble Forecast System (GEFS), Coupled with the Global Wave Ensemble System (GWES) and the NEMS GFS Aerosol Component (NGAC), Effective September 23, 2020, and Request for Comments
• Aug 20: SCN20-74: Notification of Timing Changes of All Model Data onto NCEP Web Services Effective September 23, 2020
• Aug 14: SCN20-73: Enhancement of WEA Messages for Snow Squall Warnings (SQW) to Include 360 Character English Messages and Spanish Messages in Both 90 and 360 Characters on or after September 15, 2020
• Sep 10: SCN20-72 Updated: Upgrade IDP Multi-Radar, Multi-Sensor Application Effective October 14, 2020
• Aug 25: SCN20-71 Updated: Remove GOES-16 L2 Volcanic Ash Derived Product from the Satellite Broadcast Network (NOAAPort),
  Effective on or after September 19, 2020
• Oct 29: SCN20-70 Updated: Changes to Fire Weather Forecast Zones for WFO Tucson, AZ Effective November 10, 2020
• Oct 29: SCN20-69 Updated: Changes to the Boundaries of Fire Weather Forecast Zones in Central and Eastern South Dakota and Northeast Nebraska Served by WFOs Aberdeen, SD, (ABR) and Sioux Falls, SD (FSD) Effective November 10
• Aug 12: SCN20-68: Correction to the North American Model (NAM) Model Output Statistics (MOS) Ceiling Thresholds, to be Implemented on or about September 21, 2020
• Aug 11: SCN20-67: Addition of Global Multi-Satellite Geostationary Imagery Composite Products to the Satellite Broadcast Network (SBN or NOAAPort) Effective on or after September 16, 2020
• Aug 11: SCN20-66: Addition of GOES-16 Fog and Low Stratus (FLS) Product to the Satellite Broadcast Network (SBN or NOAAPort) Effective on or after September 9, 2020
• Aug 10: SCN20-65: Upgrade IDP GIS Application for New Tropical Services Effective August 25, 2020
• Aug 4: SCN20-64: Addition of Air Quality Alerts for Smoke Effective in Cheyenne, WY, on or about September 2, 2020
• Aug 4: SCN20-63: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Salem, OR, on or about August 31, 2020
• Jul 24: SCN20-61 Updated: Enforce TLS 1.2 or Higher on Several NWS Websites Effective January 12, 2021
• Jul 14: SCN20-62: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Oakland, CA, on or about July 31, 2020
• Jun 26: SCN20-60: Change to Name of Sea Ice Advisory Product Effective on September 1, 2020 
• Jul 9: SCN20-59 Updated: Changes to HRRRv3 Smartinit Output in Support of RTMA/URMA Upgrade Effective July 23, 2020
• Jun 19: SCN20-58: Termination of the Model Diagnostic Discussion (PMDHMD) and 500-mb Height Preference Graphics on August 15, 2020
• Jun 19: SCN20-57: Suspension of the Mayaguez, Puerto Rico (TJMZ) TAF Effective September 14, 2020
• Jun 19: SCN20-56: Discontinuation of the Max/Min Temperature and Precipitation Table Product for Florida Effective Wednesday, July 22, 2020
• Jun 18: SCN20-52 Updated: Snow Level Grids for Select CONUS WFOs as an Element in the National Digital Forecast Database will Become Operational Effective December 15, 2020
• Jun 17: SCN20-55: Deactivation of Legacy GINI Blended Hydrology Products from the NOAAPort/Satellite Broadcast Network (SBN) Effective July 21, 2020
• Jul 9: SCN20-54 Updated: Upgrade to Hurricane Weather and Research Forecast (HWRF) Effective July 22, 2020
• May 15: SCN20-53: NWS to Continue the San Francisco Marine Stratus Forecast System as Long as Feasible
• Jun 18: SCN20-52 Updated: Snow Level Grids for Select CONUS WFOs as an Element in the National Digital Forecast Database will Become Operational Effective December 15, 2020
• May 8: SCN20-51: Upgrade to Hurricanes in a Multi-scale Ocean-Coupled Non-Hydrostatic (HMON) Effective June 9, 2020
• May 4: SCN20-50: Format Change to the Great Lakes Marine Website on or around July 1, 2020
• Jun 15: SCN20-49 Updated: Changes to the Aviation Tropical Cyclone Advisory (TCA) Effective Immediately
• Jul 29: SCN20-48 Updated: Operational Implementation of Graphical Forecasts for Aviation (GFA) for Hawaii and Portions of the Pacific Ocean Effective August 4, 2020
• May 22: SCN20-47: Beginning May 26, 2020, NWS will Proceed with Providing NWS Data in Geospatial Formats
• Nov 2: SCN20-46 Updated: Upgrade to the RAP and HRRR Analysis and Forecast System, Including Change to Location of North America Rapid Refresh Ensemble (NARRE) Data Effective December 2, 2020
• Jun 24: SCN20-45 Updated: Announcement of RTMA/URMA/RTMA-RU Upgrade, Including Changes to NAM SmartInit, Effective July 23, 2020, and Request for Comments
• Apr 15: SCN20-44: Cessation of Weather Observations and Suspension of TAF and Climate Products for Bisbee-Douglas International Airport (KDUG) in Arizona Effective April 15, 2020, until Further Notice
• Jun 11: SCN19-43 Updated: Implementation of NWS 360 Character English and Spanish Wireless Emergency Alerts (WEA) Messages on or after June 17, 2020, and Technical Reminder for Common Alerting Protocol (CAP) Users
• Jul 10: SCN20-42 Updated: Change to NEXRAD Level III Product Dissemination on or around June 16, 2020
• Apr 9: SCN20-41: Update to Model Analyses and Guidance (MAG) Website WaveWatch III Model (WW3) on or about April 21, 2020
• Apr 9: SCN20-40 Update: Removal of National Operational Hydrologic Remote Sensing Center (NOHRSC) National Snow Analysis (NSA) FTP Services Effective May 1, 2020
• Apr 1: SCN20-39: Changes to NWS SDM Administrative Message Product Headers and Request for Comments to be Implemented on or after April 30, 2020
• Apr 1: SCN20-38: Termination of toc.nwstg@noaa.gov Email Account with Request for Comments, to be Implemented May 1, 2020
• Apr 1: SCN20-37: Termination of the 1-800 OneNWSnet Phone Numbers with Request for Comments, to be Implemented May 1, 2020
• Mar 31: SCN20-36: Termination of the National Ceiling and Visibility Analysis (NCVA) Display Effective April 30, 2020
• Mar 31: SCN20-35: Operational Implementation of the Helicopter Emergency Medical Services (HEMS) Tool Enhancements Effective March 31, 2020
  Mar 31: SCN20-34: Implementation of Updated Description of NWS Use of Twitter Service Effective April 23, 2020
• Mar 30: SCN20-33: Upgrade NOAA nowCOAST GIS Web Mapping Portal Effective March 31, 2020
• Mar 24: SCN20-32: Upgrade of IDP National Water Model Post-Processing Effective April 28, 2020
• Aug 3: SCN19-31 Updated: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Anchorage, AK, on or about May 3, 2019
• Apr 14: SCN20-30 Updated: RDA/RPG Build 19.0 Beta Test Sites Delayed until Further Notice
• Mar 4: SCN 20-29: Four NWS Eastern Region Weather Forecast Offices (WFOs) will Begin Issuing Tropical Cyclone Forecast Products Effective on or about June 1, 2020
• Mar 3: SCN20-28: Addition of Fire Weather Hazards on the National Forecast Chart Effective Tuesday, April 7, 2020
• Mar 17: SCN20-27 Updated: Four NWS Eastern Region WFOs Will NOT Begin Issuing Tropical Cyclone Forecast Products as Previously Planned for the 2020 Hurricane Season
• Mar 2: SCN20-26: Discontinuing Experimental Graphical Weather Review Webpage Effective April 15, 2020
• Feb 27: SCN20-25: National Hurricane Center (NHC) Tropical Cyclone JavaScript Object Notation File Transition to Operational on or about May 15, 2020
• Feb 26: SCN20-24: Discontinuation of Spanish Translation of the Tropical Cyclone Discussion for the Atlantic Basin Effective April 9, 2020
• Apr 27: SCN20-23 Updated: NESDIS to Replace 4 Kilometer Resolution Version of the Blended Vegetation Health Products with a Version at 1 Kilometer Resolution on or about May 28, 2020
• Feb 13: SCN20-22: Add (GOES-West) CONUS Sector Derived Motion Winds Product and Channel Reassignments for Other Satellite Products on SBN/NOAAPort Effective March 10, 2020
• Feb 13: SCN20-21: HazCollect Service Termination Effective Immediately
• Feb 13: SCN20-20: Addition of 60-hour Tropical Cyclone Forecasts on or about May 15, 2020
• Feb 11: SCN20-19: Format Change to the Surf Zone Forecast Effective April 22, 2020
• Feb 11: SCN20-18: NWS Alaska Pacific River Forecast Center will Discontinue Issuing Text Only River Forecast Products and Daily River Text Products Effective April 1, 2020
• Feb 10: SCN20-17: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on  February 13, 2020
• Feb 7: SCN20-16: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on February 11, 2020
• Feb 7: SCN20-15: Change to NEXRAD Level III Product Dissemination on or around April 15, 2020
• Mar 25: SCN20-14 Updated: Termination of the NWS Pacific Tsunami Warning Center (PTWC) Website Effective March 23, 2020
• Feb 6: SCN20-13: Notification of Security Changes for NCEP NOMADS Website Effective April 28, 2020
• Aug 3: SCN20-12 Updated: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at San Diego, CA, on or about February 29, 2020
• Jan 24: SCN20-11: Additions and Changes to the Station Time Series BUFR Station Lists for the NAM, GFS, RAP, HRRR, SREF and HIRESW Effective February 25, 2020
• Jan 21: SCN20-10: Implement Near Sea Surface Temperature to Replace RTGSST and SSTOI, Including an Update to CDAS SST Output Effective on or about February 11, 2020
• Jan 16: SCN20-09: Earlier Release Time for RTOFS Global Products Effective January 17, 2020
• Feb 3: SCN20-08 Updated: Changes to Satellite Broadcast Network (SBN or NOAAPort) Products Associated with the End of GOES-15 Tandem Supplemental Operations on March 2, 2020
• Jan 13: SCN20-07: Correct Issue with NBM v3.1 GFS QPF Input on January 21, 2020
• Jan 13: SCN20-06: National Tsunami Warning Center Routine Communications Tests for the West Coast and Alaska Coast to Take Place on  January 16, 2020
• Jan 10: SCN20-05: NWS to Issue National Tsunami Warning Center Routine Communications Tests for the East and Gulf Coast on January 14,  2020
• an 3: SCN20-04: Termination of DMSP/SSM/I Neural Net 3 Products Effective February 4, 2020
• Feb 24: SCN20-03 Updated: Addition of Global Blended Hydrology products to the NOAAPort/Satellite Broadcast Network (SBN) Effective March 12, 2020
• Aug 3: SCN 20-02 Updated: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Del Rio, TX, on or about January 24, 2020
• Jan 2: SCN20-01: Change to the Content of the NWS Hydrologic Short-term Meteorological Model-Based Ensemble Forecasting System Effective February 11, 2020
   

Updated SCNs Sent in 2020 for Previous Years

• Jun 5: SCN19-113 Updated: Upgrade Weather.gov API Services Effective Date: June 17, 2020
• Feb 14: SCN19-101 Updated: Implementation of Wireless Emergency Alerts (WEA) Changes for Flash Flood Warnings on or after February 18,  2020
• Jan 24: SCN19-94 Updated: Addition of Risk Graphics for Individual Convective Threats in the Storm Prediction Center's Day 2 Outlook Effective with the 1730 UTC Outlook on January 30, 2020
• Jan 13: SCN19-92 Updated: Correction to Properly Pack Low Level Wind Shear Data for Downstream NBM Processing. Implementation Date has been Delayed to Tuesday, February 18, 2020
• Jan 6: SCN19-80 Updated: Removal of Redbook Graphics, GIF Images, Fax Charts, AFOS Products and Bulletins Effective December 30, 2019
• Feb 14: SCN19-43 Updated: Implementation of NWS 360 Character English and Spanish Wireless Emergency Alerts (WEA) Messages at a Date to be Determined and Technical Reminder for CAP Users

Services Change Notices 2019

• Dec 30: SCN19-80 Updated: Removal of Redbook Graphics, GIF Images, Fax Charts, AFOS Products and Bulletins Effective December 30, 2019
• Dec 17: SCN19-113: Upgrade Weather.gov API Services Effective date: January 2, 2020 
• Dec 17: SCN19-112: Changes to Public and Fire Weather Forecast Zones for WFO Eureka, CA, and WFO Sacramento, CA, Affecting Lake County,  CA, Effective March 3, 2020
• Dec 17: SCN19-111: Transfer of Responsibility of Fire Weather Forecast Zone 662 from WFO Seattle, WA, to WFO Spokane, WA, Effective March 3, 2020
• Dec 17: SCN19-110: Implementing Improved Fire Weather Zone Coverage for WFO Midland/Odessa, TX, Effective March 3, 2020
• Dec 17: SCN19-109: Changes to Public Forecast Zones for WFO Chicago, IL, Effective March 3, 2020
• Dec 17: SCN19-108: Changes to Fire Weather Forecast Zones for WFO Elko, NV, and WFO Reno, NV, Effective March 3, 2020
• Dec 17: SCN19-107: Renaming of Two Public Forecast Zones for WFO Hanford, CA, Effective March 3, 2020
• Dec 17: SCN19-106: Changes to Public Forecast Zones for WFO Honolulu, Hawaii, Effective March 3, 2020
• Dec 17: SCN19-105: Changes in Public and Fire Forecast Zones and Boundary Changes for NWS Gray, ME, Effective March 3, 2020
• Dec 17: SCN19-104: New Fire, Public and Marine Forecast Zones and Boundary Changes for NWS Caribou, ME, Effective March 3, 2020
• Dec 17: SCN19-103: Change to Public Forecast Zone-County Correlation File for Alaska Zone 125 Effective March 3, 2020
• Dec 16: SCN19-102: Initial Release of SPADES Distribution Services Effective December 16, 2019
• Dec 13: SCN19-92 Update: Processing the National Blend of Models (NBM) Mean Absolute Error (MAE) Files for the Oceanic Domain Changed to January 14, 2020
• Dec 10: SCN19-101: Implementation of Wireless Emergency Alerts (WEA) Changes for Flash Flood Warnings on or after January 8, 2020
• Dec 10: SCN19-100: Resumption of NTWC Communications Tests Effective January 14, 2019
• Dec 10: SCN19-98 Updated: New Services and Updates to the NWS IDP GIS Effective December 17, 2019
• Dec 2: SCN19-99: Alerting Partners that NDBC Weather Buoy #46015 Near Port Orford, Oregon, Was Damaged by a Passing Vessel on November 16, 2019, and is Inoperable
• Dec 10: SCN19-98 Updated: New Services and Updates to the NWS IDP GIS Effective December 17, 2019
• Nov 26: SCN19-72 Updated: Marine Forecasts Website will be Redirected on or around December 31, 2019
• Nov 22: SCN19-97: RDA/RPG Build 19.0 to Begin Beta Test on or around April 15, 2020
• Nov 19: SCN19-96: Addition of Snow Squall to SPC Mesoscale Discussions (CONUS Only) Effective on or about December 16, 2019
• Nov 21: SCN19-95 Updated: Changes to GOES Data at the Space Weather Prediction Center Effective December 9, 2019
• Jan 24: SCN19-94 Updated: Addition of Risk Graphics for Individual Convective Threats in the Storm Prediction Center's Day 2 Outlook Effective with the 1730 UTC Outlook on January 30, 2020
• Nov 13: SCN19-93: Temporary Implementation of Terminal Aerodrome Forecast (TAF) Service Related to Super Bowl Effective January 28, 2020, through February 4, 2020
• Nov 12: SCN19-69 Updated: Adjusting Issuance Times for Oceanic Gridded Marine Offshore and High Seas Forecasts in NDFD Effective on or about December 10, 2019
• Nov 12: SCN19-83 Updated: NWS Hazard Simplification Project: Implementation of Consolidation and Re-formatting of NWS Marine Products on December 3, 2019
• Jan 13: SCN19-92 Update: Correction to Properly Pack Low Level Wind Shear Data for Downstream NBM Processing. Implementation Date has been Delayed to Tuesday, February 18, 2020
• Oct 31: SCN19-91: Termination of Legacy BUFR and GRIB 1 MOS Products on or about December 17, 2019
• Oct 31: SCN19-28 Update: Termination of the Gridded Model Output Statistics (GMOS/MOSGuide) on or about December 17, 2019
• Oct 28: SCN19-90: CPC will be Changing its Station-Based Precipitation and Temperature Analysis Timeseries Charts from Static Style to  Dynamically Generated Graphics Effective February 21, 2020
• Oct 28: SCN19-89: CPC to Update Station-Based Precipitation and Temperature Data Files and Tables on or about January 31, 2020
• Oct 24: SCN19-88: Legacy EMWIN Service Termination Effective December 2, 2019
• Oct 22: SCN19-87: NWS WFO Dissemination of Blue Alerts Begins on or After January 7, 2020
• Oct 17: SCN19-68 Updated: Implementation of TAF Service for Minden-Tahoe Airport (KMEV) in Nevada has been Delayed until Further Notice
• Oct 10:  SCN19-83 Updated: NWS Hazard Simplification Project: Implementation of Consolidation and Re-formatting of NWS Marine Products on December 3, 2019
• Oct 10: SCN19-86: Implementation of International Civil Aviation Organization Space Weather Advisory Products Effective on or about November 7, 2019
• Oct 10: SCN19-85: Changes to Transmission Deadlines of Several WPC Medium-Range Products Effective on or about November 14, 2019
• Oct 10: SCN19-84: Upgrade NCEP Global Forecast Systems to v15.2.0 Effective on or about November 7, 2019
• Sep 19: SCN19-61 Updated: Changes to LAMP Station-Based and Gridded Guidance Effective on or about October 22, 2019
• Nov 12: SCN19-83 Updated: NWS Hazard Simplification Project: Implementation of Consolidation and Re-formatting of NWS Marine Products on December 3, 2019
• Sep 18: SCN19-82: Change to TDWR SPG Product Dissemination on or around November 19, 2019
• Sep 18: SCN19-81 Updated: Graphical Turbulence Guidance Product Effective November 12, 2019
• Sep 17: SCN19-80: Removal of Redbook Graphics, GIF Images, Fax Charts, AFOS Products and Bulletins Effective November 12, 2019
• Sep 17: SCN19-64 Updated: Implementation of TAF Service for Hamilton Airport in Montana Effective September 24, 2019 has been Rescinded until Further Notice
• Sep 12: SCN19-79: Change to Real Time Data Monitoring System Website URL Effective September 12, 2019
• Sep 11: SCN19-78: Transition Gate Forecast to Operational Status Effective October 10, 2019
• Sep 10: SCN19-77: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Cold Bay, Alaska, on or about September 29, 2019
• Sep 10: SCN19-58 Updated: Changes to the Boundaries of Fire Weather Forecast Zones in Northeastern Wyoming and Western South Dakota Effective October 10, 2019
• Sep 10: SCN19-57 Updated: Changes to Public Forecast Zones for WFO Albuquerque, NM, Effective October 10, 2019
• Sep 10: SCN19-56 Updated: Changes to Fire Weather Forecast Zones for the Kittitas and Yakima Valleys of Washington and the Eastern Columbia River Gorge in Washington Effective October 10, 2019
• Sep 10: SCN19-55 Updated: Changes in Public Forecast Zones for Southeast Montana and Northeast Wyoming Effective October 10, 2019
• Sep 9: SCN19-76: SPG Build 10.0 to Begin Beta Test on or around March 16, 2020
• Sep 5: SCN19-61 Updated: Changes to LAMP Station-Based and Gridded Guidance Effective on a Date to be Determined
• Sep 3: SCN19-75: Termination of ASOS Operations on Annette Island, Alaska (PANT), on or after October 1, 2019
• Aug 27: SCN19-53 Updated: Enterprise EMWIN Service Transition to Operations for GOES-East and GOES-West Satellite Broadcasts Effective: August 29, 2019
• Aug 27: SCN16-35: Postponed: Implementation of Changes to the NWS Forecast Website on or about July 10, 2019
• Aug 26: SCN19-62 Updated: Upgrade of the MADIS Distribution Services Effective Date September 4, 2019
• Aug 21: SCN19-74: Earlier Release Time for SREF Ensemble Products Effective August 21, 2019
• Aug 20: SCN19-73: NWS Alaska Pacific River Forecast Center will Discontinue Issuing Text Only River Forecast Products and Daily River Text Products Effective September 23, 2019
• Nov 26: SCN19-72 Updated: Marine Forecasts Website will be Redirected on or around December 31, 2019
• Aug 14: SCN19-71: Operational Implementation of Graphical Forecasts for Aviation (GFA) for the Gulf of Mexico, Caribbean Sea and Western North Atlantic Ocean Effective August 14, 2019
• Aug 12: SCN19-70 Updated: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Kotzebue, AK, on or about August 19, 2019
• Nov 12: SCN19-69 Updated: Adjusting Issuance Times for Oceanic Gridded Marine Offshore and High Seas Forecasts in NDFD Effective on or about December 10, 2019
• Jul 19: SCN19-67: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Nome, AK, on or after August 12, 2019
• Jul 16: SCN19-66: Replace S-NPP VIIRS NCC Imagery with NOAA-20 VIIRS NCC Imagery on SBN Between July 16, 2019 and August 20, 2019
• Jul 16: SCN19-65: Discontinuation of Output from the NOS Lake Michigan Operational Forecast System and Lake Huron Operational Forecast System on NOAA nowCOAST Map Services Effective July 23, 2019
• Sep 17: SCN19-64 Updated: Implementation of TAF Service for Hamilton Airport in Montana Effective September 24, 2019 has been Rescinded until Further Notice
• Aug 27: SCN19-53 Updated: Enterprise EMWIN Service Transition to Operations for GOES-East and GOES-West Satellite Broadcasts Effective: August 29, 2019
• Jul 10: SCN19-63 Updated: NWS Hazard Simplification (Haz Simp) Project: Reinstatement of Lake Effect Snow Warning Product and Addition of "Impacts" Bullet Effective October 1, 2019
• Jul 9: SCN19-63 Updated: NWS Hazard Simplification (Haz Simp) Project: Reinstatement of Lake Effect Snow Warning Product and Addition of "Impacts" Bullet Effective October 1, 2019
• Jul 8: SCN19-63: NWS Hazard Simplification (Haz Simp) Project: Reinstatement of Lake Effect Snow Warning Product and Addition of "Impacts" Bullet Effective October 1, 2019
• Aug 12: SCN19-62 Updated: Upgrade of the MADIS Distribution Services Effective Date September 4, 2019
• Jul 31: SCN19-61 Updated: Changes to LAMP Station-Based and Gridded Guidance Effective September 10, 2019
• Jul 2: SCN19-60: Implementation of Impact-Based Warnings for Flash Floods Effective on or after September 16, 2019
• Jun 28: SCN19-11 Updated: Converting Legacy Ocean Prediction Center .shtml Webpages to .php Format Effective July 9, 2019
• Jun 27: SCN19-54 Updated: NWS Hazard Simplification (Haz Simp) Project: Reformatting NWS Non-Precipitation Weather Hazard Products Effective September 24, 2019
• Jun 26: SCN19-59: Replace S-NPP NUCAPS Soundings with NOAA-20 NUCAPS Soundings on Satellite Broadcast Network (SBN) on July 2, 2019
• Jun 26: SCN19-58: Changes to the Boundaries of Fire Weather Forecast Zones in Northeastern Wyoming and Western South Dakota Effective September 10, 2019
• Jun 26: SCN19-57: Changes to Public Forecast Zones for WFO Albuquerque, NM, Effective September 10, 2019
• Jun 26: SCN19-56: Changes to Fire Weather Forecast Zones for the Kittitas and Yakima Valleys of Washington and the Eastern Columbia River Gorge in Washington Effective September 10, 2019
• Sep 10: SCN19-55 Updated: Changes in Public Forecast Zones for Southeast Montana and Northeast Wyoming Effective October 10, 2019
• Jun 27: SCN19-54 Updated: NWS Hazard Simplification (Haz Simp) Project: Reformatting NWS Non-Precipitation Weather Hazard Products Effective September 24, 2019
• Jun 25: SCN19-53: Enterprise EMWIN Service Transition to Operations for GOES-East and GOES-West Satellite Broadcasts Effective July 24, 2019
• Jun 25: SCN19-52: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at McGrath, Alaska, on or after June 25, 2019
• Jun 20: SCN19-51: Implementation of New Oceanographic Forecast Modeling Systems for the Cook Inlet and Lake Michigan and Lake Huron Effective July 23, 2019
• Jun 19: SCN19-50: New Services and Updates to the NWS IDP GIS Effective Date June 24, 2019
• Jun 13: SCN19-49: Changes to the Drought Information Statement (DGT) Text Product Issued by WFOs Under Local Drought Conditions Effective on or around September 1, 2019
• Jun 11: SCN19-48: Modification to Support E-mail for Software Development Branch on or about October 1, 2019
• Jun 10: SCN19-47: Additional Point Locations Within the Global Wave Forecasting System: Effective June 12, 2019
• May 31: SCN19-46: NWS Alaska Pacific River Forecast Center will Discontinue Issuing its Text Hydrometerological Discussion Product Effective July 1, 2019
• May 22: SCN19-45: NOAA Profiler Network (NPN) Data Available on or around July 15, 2019
• May 17: SCN19-44: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at King Salmon, Alaska, on or after May 17, 2019
• Feb 14: SCN19-43 Updated: Implementation of NWS 360 Character English and Spanish Wireless Emergency Alerts (WEA) Messages at a Date to be Determined and Technical Reminder for CAP Users
• Jan 7: SCN19-113 Updated: Upgrade Weather.gov API Services, Effective Date: January 7, 2020
• May 16: SCN19-42: Upgrade of National Water Model Effective: June 19, 2019
• Jul 9: SCN19-21 Updated: Termination of Legacy METAR and TAF Bulletins Distributed by the Washington OPMET Databank will be Delayed until a Date to be Determined
• May 9: SCN19-41: Additions and Changes to the NAM Nest and HiResW Effective June 12, 2019
• May 7: SCN19-40: Upgrade NCEP Global Forecast Systems (GFS) to V15.1 Effective June 12, 2019
• May 6: SCN19-39: Replacement of the Marine Fog Product with GFS Visibility Product Effective June 12, 2019
• May 6: SCN19-38: HYSPLIT Model Update Effective June 12, 2019
• May 6: SCN19-37:  Implementation of TAF Service for West Yellowstone Airport (KWYS) in Montana Effective July 16, 2019
• May 2: SCN18-86 Updated: NWS Upper Air Station in Boise, ID Transitioned to GPS Lockheed Martin LMS-6 403 MHz Radiosonde with the Lockheed Martin Groundstation (LMG) on April 11, 2019
• Apr 29: SCN19-36: Upgrade of WSA-Enlil Heliospheric Model and Downscaled Products Effective May 28, 2019
• Apr 29: SCN19-35: Changes to Forecast Data Available on Web Relating to Data Endpoints on or about June 24, 2019
• Apr 25: SCN19-34: Discontinuation of the Peachtree City/Atlanta, GA Other Supplemental Observations Product Effective May 29, 2019
• Apr 25: SCN19-33: Changes to NWS Dissemination Webpage URLs Effective October 31, 2019
• Apr 23: SCN19-32: WSR-88D RDA/RPG Build 18.2 Beta Test to Begin on or around June 11, 2019
• Apr 16: SCN19-23 Updated: Termination of the GEFS-based MOS Product (MEN) on or about April 23, 2019
• Apr 5: SCN19-31: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Anchorage, AK, on or about May 3, 2019
• Apr 5: SCN19-30: GOES ABI Mode 6 Transition on April 2, 2019
• Apr 1: SCN19-29: Changes to the Post Tropical Cyclone Text Product Issued by WFOs Following Tropical Cyclones Effective on or around June 1, 2019
• Oct 31: SCN19-28 Update: Termination of the Gridded Model Output Statistics (GMOS/MOSGuide) on or about December 17, 2019
• Mar 26: SCN19-27: Discontinuation of OPeNDAP NetCDF Service at NOS/CO-OPS, Effective May 31, 2019
• Mar 22: SCN18-89 Updated: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Barrow, AK, on February 12, 2019
• Mar 22: SCN19-26: Temporary NWS NDBC Outages for Some C-MAN Stations Projected to Occur on or after April 6, 2019
• Mar 18: SCN19-25: Transition Lake Erie Harmful Algal Bloom Web Page to Operational Status Effective May 1, 2019
• Mar 15: SCN19-24: Transition of Offshore Waters Forecasts for the East Pacific Ocean within 250 NM of Mexico, Central America, Columbia, and Ecuador to Operational Effective April 16, 2019
• Mar 15: SCN19-23 Updated: Termination of the GEFS-based MOS Product (MEN) on or about April 23, 2019
• Mar 14: SCN19-22: Honolulu High Seas Charts Coverage Area Change Effective on or about April 15, 2019
• May 16: SCN19-21 Updated: Termination of Some Legacy METAR and TAF Bulletins Distributed by the Washington OPMET Databank will be on or around July 17, 2019
• Mar 12: SCN19-20: Degraded Functionality on the forecast.weather.gov Application for Users of Internet Explorer Versions 9 and 10
  on or about April 16, 2019
• Mar 7: SCN19-19: Enhanced Group Calling (EGC) Messages via INMARSAT C \ to Provide Urgent Code 2 for all Weather Systems with Hurricane Force Winds, Effective April 9, 2019
• Mar 7: SCN19-18: Addition of Tropical Cyclone Storm Surge Watches and Warnings for Puerto Rico and the United States Virgin Islands Effective on or around June 1, 2019
• Mar 6: SCN19-17: Termination of the NWS Pacific Region Web Service Effective May 30, 2019
• Feb 27: SCN19-16: Modification of AWIPS PILs in WFO Guam's Product Suite Effective April 9, 2019 
• Feb 26: SCN19-15: WPC Experimental National Forecast Chart will Become Operational on March 28, 2019
• Feb 26: SCN19-14: Discontinuation of the Temperature and Precipitation Table Product for Alabama and Replace with Regional Temperature and Precipitation Table Product for Birmingham Effective Thursday, March 28, 2019
• Feb 26: SCN19-13: Termination of the NWS Hydrologic Information Center (HIC) Web Site Effective March 29, 2019
• Feb 26: SCN19-12: GFS Version 15 Model Implementation Schedule is Paused until a Date to be Determined
• Jun 28: SCN19-11 Updated: Converting Legacy Ocean Prediction Center .shtml Webpages to .php Format Effective July 9, 2019
• Feb 22: SCN19-10: Termination of Legacy OPC Website Address Effective July 9, 2019
• Feb 22: SCN19-09: Operational Implementation of AWC Extended Traffic Flow Management (TFM) Convective Forecast (TCF) Effective February 28, 2019
• Feb 22: SCN18-118 Updated: Implementing Improved Public Zone Coverage for WFO Midland/Odessa, TX, Effective April 2, 2019
• Feb 21: SCN18-117 Updated: Changes in Fire and Public Zones for NWS Weather Forecast Office Jacksonville, FL, Effective April 2, 2019
• Feb 20: SCN18-120 Updated: Change in Fire Weather Forecast Zones and Boundaries for WFO Morristown, TN and WFO Nashville, TN, Effective April 2, 2019
• Feb 20: SCN18-119 Updated: Changes in Fire, Public, and Marine Forecast Zones and Boundary Changes for WFO Newport/Morehead City, NC, Effective April 2, 2019
• Feb 22: SCN18-118 Updated: Implementing Improved Public Zone Coverage for WFO Midland/Odessa, TX, Effective April 2, 2019
• Feb 21: SCN18-117 Updated: Changes in Fire and Public Zones for NWS Weather Forecast Office Jacksonville, FL, Effective April 2, 2019
• Feb 20: SCN18-116 Updated: Changes in Public and Fire Weather Forecast Zones for Central California Effective April 2, 2019
• Feb 20: SCN18-115 Updated: Changes to Public and Fire Forecast Zones for WFO Gaylord, MI Effective April 2, 2019
• Feb 20: SCN18-114  Updated: New Fire and Public Forecast Zones and Boundary Changes for Lancaster County in north central South Carolina Effective April 2, 2019
• Feb 20: SCN18-113 Updated: Changes to Marine and Land Zones of Coastal Northwest California Effective April 2, 2019
• Feb 19: SCN18-93 Updated: WPC will Assume NWS Operational Preparation and Dissemination Responsibility for the Days 3-7 Part of the U.S. Hazards Outlook on or about February 21, 2019
• Feb 19: SCN19-08 Updated: Termination of the SPC Watch Corner Points Message Effective on or about April 30, 2019
• Feb 12: SCN19-07: Temporary Change of SBN/NOAAPORT Transmission of National Blend of Models (NBM) Guidance Effective March 11-13, 2019
• Feb 12: SCN19-06: Change in the Scheduled Issuance Time of the Day 1 WPC Excessive Rainfall Outlook Effective March 14, 2019
• Feb 12: SCN19-05: NWS High Seas Forecasts Will No Longer Use the Term PAN PAN Effective March 14, 2019
• Feb 12: SCN18-93 Updated: WPC will Assume NWS Operational Preparation and Dissemination Responsibility for the Days 3-7 Part of the U.S. Hazards Outlook Starting Feb 20, 2019
• Feb 8: SCN19-04: Transition of GOES-17 to GOES West, February 11-15, 2019
• Feb 8: SCN19-03: GOES Advanced Baseline Imager ABI Mode 6 Tests in February 2019
• Feb 4: SCN18-93 Updated: WPC will Assume NWS Operational Preparation and Dissemination Responsibility for the Days 3-7 Portion of the U.S. Hazards Outlook Starting on February 12, 2019
• Jan 31: SCN18-111 Updated: Upgrade In-Flight Icing Forecast Icing Product Effective February 19, 2019
• Jan 31: SCN18-121 Updated: Extending Forecast for Quantitative Precipitation Forecast, Ice Accumulation and Snow Accumulation Grids Across CONUS in the NDFD Effective February 5, 2019
• Jan 30: SCN19-02: Implementation of Terminal Aerodrome Forecast (TAF) Service for: KCOT, Cotulla-La Salle County Airport Cotulla, TX, Effective: April 15, 2019
• Jan 30: SCN19-01: Discontinuation of the Little Rock, AR, Regional Weather Summary Effective February 28, 2019
• Jan 29: SCN18-100 Updated: URLs for the NOAA NCEP Websites will be Redirected to HTTPS Effective February 4, 2019

Services Change Notices 2018

• Dec 24: SCN18-121: Extending Forecast Quantitative Precipitation Forecast, Ice Accumulation and Snow Accumulation Across CONUS in the NDFD Effective January 24, 2019
• Dec 24: SCN18-100 Updated: URLs for the NOAA NCEP Websites will be Redirected to HTTPS Effective Immediately through January 15, 2019
• Dec 18: SCN18-115 Updated: Changes to Public and Fire Forecast Zones for WFO Gaylord, MI Effective March 5, 2019
• Feb 20: SCN18-120 Updated: Change in Fire Weather Forecast Zones and Boundaries for WFO Morristown, TN and WFO Nashville, TN, Effective April 2, 2019
• Feb 20: SCN18-119 Updated: Changes in Fire, Public, and Marine Forecast Zones and Boundary Changes for WFO Newport/Morehead City, NC, Effective April 2, 2019
• Feb 22: SCN18-118 Updated: Implementing Improved Public Zone Coverage for WFO Midland/Odessa, TX, Effective April 2, 2019
• Feb 21: SCN18-117 Updated: Changes in Fire and Public Zones for NWS Weather Forecast Office Jacksonville, FL, Effective April 2, 2019
• Feb 20: SCN18-116 Updated: Changes in Public and Fire Weather Forecast Zones for Central California Effective April 2, 2019
• Feb 20: SCN18-115 Updated: Changes to Public and Fire Forecast Zones for WFO Gaylord, MI Effective April 2, 2019
• Feb 20: SCN18-114 Updated: New Fire and Public Forecast Zones and Boundary Changes for Lancaster County in North Central South Carolina Effective April 2, 2019
• Feb 20: SCN18-113 Updated: Changes to Marine and Land Zones of Coastal Northwest California Effective April 2, 2019
• Dec 14: SCN18-80 Updated: Termination of County-based Flash Flood Guidance (FFG) At All Locations Effective March 31, 2019
• Dec 14: SCN18-112: WSR-88D VCP 35 to be Modified at 10 Radars on or around January 23, 2019
• Dec 7: SCN18-111: Upgrade In-Flight Icing Forecast Icing Product Effective January 8, 2019
• Dec 6: SCN18-100 Updated: URLs for the NOAA NCEP Websites will be Redirected to HTTPS Effective Immediately through December 31, 2018
• Dec 4: SCN18-110: Temporary Suspension of TAF Service for McAlester Regional Airport (KMLC) in Oklahoma Effective December 4, 2018, until Further Notice
• Nov 28: SCN18-78 Update: Correction of the GRIB2 Encoding of the Probability of Thunder in the Experimental National Blend of Models Guidance (NBM) Effective December 5, 2018, and the Request for Comments
• Nov 28: SCN18-109: Implementation of TAF Service for Phoenix Deer Valley Airport (KDVT) in Arizona Effective March 6, 2019
• Nov 28: SCN18-108 Updated: Implementation of TAF Service for KMVN, Mount Vernon, IL, Effective February 13, 2019
• Nov 21: SCN18-107: Modification of the WMO Header for Alaska Region TAF Products Effective February 4, 2019
• Nov 20: SCN18-100 Updated: URLs for the NOAA NCEP Websites will be Redirected to HTTPS Effective Immediately through December 31, 2018
• Nov 20: SCN18-96 Updated: RTMA/URMA/RTMA-RU Upgrade Implementation Start Time Changed to the 1200z Cycle on December 4, 2018
• Nov 19: SCN18-106: Changes to GOES-17 Imagery on the Satellite Broadcast Network (SBN or NOAAPORT) Leading to the GOES West Transition Effective November 15, 2018
• Nov 16: SCN18-105: Discontinuation of Great Lakes Online (GLOL) Great Lake Observation Product at NOS/CO-OPS, Effective December 4, 2018
• Nov 16: SCN18-104: Air Quality Prediction Update: Effective December 18, 2018
• Nov 15: SCN18-103: Upgrade of NOAA nowCOAST GIS Web Mapping Portal Effective on or about November 19, 2018
• Nov 15: SCN18-102 Updated: Discontinuation of NWS High Seas and Storm Warnings over NIST Time Frequency Broadcasts Effective January 31, 2019
• Nov 15: SCN18-101: NDBC Removing Files from TGFTP Service Effective November 20, 2018
• Dec 6: SCN18-100 Updated: URLs for the NOAA NCEP Websites will be Redirected to HTTPS Effective Immediately through December 31, 2018
• Nov 9: SCN18-99: Transition Long Range River Flood Risk Outlook (LRO) to Operational Status Effective December 10, 2018
• Nov 5: SCN18-95 Updated: Upgrade Multi-Radar, Multi-Sensor Application Effective November 7, 2018
• Nov 1: SCN18-98: Transition NWS Extreme Precipitation Monitor (EPM) to Operational Status Effective December 1, 2018
• Oct 29: SCN18-97 Updated: Change to Water Level Datum Displayed on the Advanced Hydrologic Prediction Service (AHPS) Webpage Postponed until Further Notice
• Oct 25: SCN18-90 Updated: Polygon-based Snow Squall Warnings and Polygon-based Dust Storm Warnings and Dust Advisories Transition to Operational Status on or about November 1, 2018
• Oct 23: SCN18-91 Updated: Modification of AWIPS PILs in WFO Guam's Product Suite Effective on Date to be Determined
• Nov 20: SCN18-96 Updated: RTMA/URMA/RTMA-RU Upgrade Implementation Start Time Changed to the 1200z Cycle on December 4, 2018
• Nov 5: SCN18-95 Updated: Upgrade Multi-Radar, Multi-Sensor Application Effective November 7, 2018
• Oct 3: SCN18-94: Changes to Valid Time Event Codes (VTEC) and Event Tracking Numbers (ETN) for Domestic Tsunami Test Products Effective April 1, 2019
• Sep 28: SCN18-80 Updated: Termination of County-based Flash Flood Guidance (FFG) At All Locations Effective December 31, 2018
• Sep 26: SCN18-93: WPC will Assume NWS Operational Preparation and Dissemination Responsibility for the Days 3-7 Portion of the U.S. Hazards Outlook Starting on January 3, 2019
• Sep 26: SCN18-92: Soliciting Comments until November 4, 2018 on Ending Dissemination of Redbook Graphic Images as Part of the NWS Operational Delivery of the CPC Days 3-14 U.S. Hazards Outlook on November 6, 2018
• Oct 23: SCN18-91 Updated: Modification of AWIPS PILs in WFO Guam's Product Suite Effective on Date to be Determined
• Oct 25: SCN18-90 Updated: Polygon-based Snow Squall Warnings and Polygon-based Dust Storm Warnings and Dust Advisories Transition to Operational Status on or about November 1, 2018
• Sep 21: SCN18-36 Updated: Probabilistic Tropical Cyclone Storm Surge (P-Surge) Update to NDGD NWS Web Service: Effective October 23, 2018
• Mar 22: SCN18-89 Updated: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Barrow, AK, on February 12, 2019
• Sep 11: SCN18-88: Upgrade of NOAA nowCOAST GIS Web Mapping Portal Effective late September 2018
• Sep 10: SCN18-77 Updated: Changes to the Global Forecast System (GFS)-based Model Output Statistics (MOS) Guidance, Effective on or about October 3, 2018
• Sep 10: SCN18-76 Updated: Changes to Ensemble Kernel Density Model Output Statistics (EKDMOS) Effective October 3, 2018
• Sep 10: SCN18-70 Updated: To Include Datum Information for Koror. NWS Upper Air Station in Koror, Palau, to Use GPS Lockheed Martin LMS-6 403 MHz Radiosonde with the Lockheed Martin Groundstation (LMG) Starting on or about August 11, 2018
• Aug 31: SCN18-87: Testing of GOES-17 Advanced Baseline Imager (ABI) Mode 6 Imagery on the Satellite Broadcast Network (SBN or NOAAPort), Effective September 10-21, 2018
• May 2: SCN18-86 Updated: NWS Upper Air Station in Boise, ID, Transitioned to GPS Lockheed Martin LMS-6 403 MHz Radiosonde with the Lockheed Martin Groundstation (LMG) on April 11, 2019
• Aug 24: SCN18-85: Addition of GOES-17 Imagery to the Satellite Broadcast Network Effective August 28, 2018
• Aug 23: SCN17-77 Updated: NWS Hazard Simplification Project: Lake Effect Snow Warning Consolidation Expanded Nationwide Effective October 15, 2018
• Aug 20: SCN18-67 Updated: Changes to the Radiofacsimile Broadcast Schedules from the Boston, MA; Pt. Reyes, CA; and Kodiak, AK, Effective September 19, 2018
• Aug 16: SCN18-84: Corrections to Gridded Binary Version 2 (GRIB2) Encoding Parameters for National Digital Forecast Database (NDFD) Products Effective October 30, 2018
• Aug 16: SCN18-83: Availability of Standard Hydrometeorological Exchange Format (SHEF) for NOS Water Level Data Relative to Mean Higher High Water (MHHW) Effective Immediately
• Aug 16: SCN18-82: WSR-88D Low Elevation Angle to be Implemented at KBUF Buffalo, NY, on or around October 9, 2018
• Aug 13: SCN18-81: Mixed Case Messaging for 6 to 10 day, 8 to 14 Day, and U.S. Hazards Outlooks Effective October 24, 2018
• Aug 13: SCN 18-79 Updated: CANCELLED: Modification of AWIPS PILs in WFO Guam's Product Suite September 11, 2018
• Dec 14: SCN18-80 Updated: Termination of County-based Flash Flood Guidance (FFG) At All Locations Effective March 31, 2019
• Nov 28: SCN18-78 Update: Correction of the GRIB2 Encoding of the Probability of Thunder in the Experimental National Blend of Models Guidance (NBM) Effective December 05, 2018, and the Request for Comments
• Aug 9: SCN18-77 Updated: Changes to the Global Forecast System (GFS)-based Model Output Statistics (MOS) Guidance, Effective on or about October 3, 2018
• Aug 9: SCN18-76 Updated: Changes to Ensemble Kernel Density Model Output Statistics (EKDMOS) Effective October 3, 2018
• Aug 6: SCN18-75: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Bethel, Alaska, Effective on or about September 15, 2018
• Aug 2: SCN18-71 Updated: Change in the METAR Code for the United States Regarding Hail Reporting Effective September 13, 2018
• Aug 2: SCN18-74: Transition NDFD 3 km Alaska Region (AR) Gridded Forecasts to Operational Status Effective August 30, 2018
• Jul 23: SCN18-72 UPDATED URGENT: Possible Radiosonde Data Interruptions at Hilo and Lihue, Hawaii Effective on July 24-25, 2018
• Jul 23: SCN18-73: Service Transfer of Lawrence and Randolph Counties, AR, to the Little Rock NWS Weather Forecast Office Effective October 2, 2018
• Jul 16: SCN18-70 Updated: To Include Datum Information for Koror. NWS Upper Air Station in Koror, Palau, to Use GPS Lockheed Martin LMS-6 403 MHz Radiosonde with the Lockheed Martin Groundstation (LMG) Starting on or about August 11, 2018
• Jul 5: SCN18-69: Add Jason-3 Satellite Marine Altimetry Products to the Satellite Broadcast Network (SBN or NOAAPort) Effective July 17, 2018
• Jul 2: SCN18-68: Termination of Aviation Weather Observations from WSO Koror, Republic of Palau Effective July 31, 2018 
• Jun 20: SCN18-51 Updated: Climatology Calibrated Precipitation Analysis (CCPA) Changes: Effective July 18, 2018
• Jun 20: SCN18-50 Updated: Upgrade of GEFS/NAEFS Bias-Corrected and Downscaled Products: Effective July 18, 2018
• Jun 18: SCN18-66: Transition of NOAAPORT Geostationary Operational Environmental Satellite-16 (GOES-16) Imagery to Fixed Grid Effective June 19, 2018
• Jun 18: SCN18-65: Upgrading National Ocean Service (NOS) Operational Forecast Systems for the Great Lakes Effective July 16, 2018
• Jun 18: SCN18-64: Transfer of Open Lake Forecast and Open Lake Watches, Warnings and Advisory Responsibility for Lake Michigan from WFO Chicago to WFO Milwaukee Effective September 5, 2018
• Jun 18: SCN18-45 Updated: WSR-88D Low Elevation Angle Field Test to Begin on or around September 17, 2018, at Medford, OR and San Francisco, CA
• Jun 15: SCN18-53 Updated: Changes to Ensemble Kernel Density MOS (EKDMOS) Effective July 18, 2018
• Jun 15: SCN18-63: Use of Mixed Case Text/95 ASCII Character Set in Selected NWS Weather Prediction Center Forecast Discussion Products Effective July 24, 2018
• Jun 8: SCN17-120 Updated: GOES-14 Emergency Managers Weather Information Network Broadcast Available on or before December 11, 2017
• Jun 8: SCN18-62: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at St. Paul, Alaska, Effective on or about July 1, 2018
• Jun 8: SCN18-61: Minor Adjustment to Storm Prediction Center (SPC) Watch Hazard Probabilities Product, Effective July 18, 2018
• Jun 8: SCN18-60: Upgrade Hurricane Weather and Research Forecast (HWRF) Model: Effective July 9, 2018
• Jun 8: SCN18-59: Upgrade the Hurricanes in a Multi-scale Ocean-coupled Non-hydrostatic (HMON) Model: Effective July 9, 2018
• May 31: SCN18-58: Upgrade to the RAP and HRRR Analysis and Forecast System: Effective July 11, 2018
• May 31: SCN18-57: Additions and Changes to the BUFR Station Lists for the NAM, GFS, RAP, HRRR, SREF and Hi-Res W  Effective July 11, 2018
• May 30: SCN18-56: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Yakutat, Alaska Effective on or about June 10, 2018
• May 30: SCN18-53 Updated: Changes to Ensemble Kernel Density MOS (EKDMOS) Effective July 2, 2018
• May 28: SCN18-55: Change of Heat Advisory Thresholds Across Upstate New York and Northern New England Effective June 1, 2018
• May 24: SCN18-54: Discontinuation of the Precipitation Forecast (AGF) for Hawaii Effective June 25, 2018
• May 17: SCN18-49 Updated: Discontinuation of Several NWS NCO Websites and Relocation of Others Effective June 18, 2018
• May 17: SCN18-52: Removal of Drought Information from the U.S. Hazards Outlook Starting with the July 25, 2018 Release
• Jun 20: SCN18-51 Updated: Climatology Calibrated Precipitation Analysis (CCPA) Changes: Effective July 18, 2018
• Jun 20: SCN18-50 Updated: Upgrade of GEFS/NAEFS Bias-Corrected and Downscaled Products: Effective July 18, 2018
• May 15: SCN18-19 Updated: Format for the Reconnaissance Vortex Data Message Changing on or around June 1, 2018
• May 17: SCN18-49 Updated: Discontinuation of Several NWS NCO Websites and Relocation of Others Effective June 18, 2018
• May 10: SCN18-47 Updated: Consolidate WPC Quantitative Precipitation Discussion and Excessive Rainfall Discussion, Effective June 5, 2018
• May 1: SCN18-48: Public County Shapefile Renaming for WFO Newport/Morehead City, NC, Effective July 10, 2018
• Apr 27: SCN18-46: Use of Above Ground Level in the Coastal Hazard Message Effective On or Around May 31, 2018
• Apr 26: SCN18-45: WSR-88D Low Elevation Angle Field Test to Begin on or around July 2, 2018, at Medford, OR, and San Francisco, CA
• Apr 24: SCN18-44: CPHC will Discontinue National Tropical Cyclone Watch/Warning Products (TCV) Effective on or about June 1, 2018
• Apr 24: SCN18-43: Changes to City Name for Barrow, AK, Effective for NWS Products and Services on or about August 15, 2018
• Apr 20: SCN18-42: Approval of Service Description Document describing NWS Impact-based Decision Support Services Effective April 20, 2018
• Apr 17: SCN18-41: Changes to Public Forecast Zones for WFO Pocatello, ID, Effective July 10, 2018
• Apr 13: SCN18-19 Updated: Format for the Reconnaissance Vortex Data Message Changing on or around May 15, 2018
• Apr 13: SCN18-40: The Tropical Cyclone Marine Danger Graphic from the CPHC will Match the NHC Danger Graphic Effective on or about June 1, 2018
• Apr 13: SCN18-13 Updated: Implementing Improved Public and Fire Zone Coverage for WFO Brownsville/Rio Grande Valley, TX, Effective May 1, 2018
• Apr 13: SCN17-126 Updated: Implementing Improved Public and Fire Zone Coverage for the Coastal Counties Along the Middle Texas Coast Effective May 1, 2018
• Apr 13: SCN18-12 Updated: Changes in Fire and Public Zones for WFO Melbourne, FL, Effective May 1, 2018
• Apr 11: SCN18-39: Arrival of Tropical-Storm-Force Winds Graphics Becomes Operational on or around May 15, 2018
• Apr 11: SCN18-38: WFOs to be Allowed to Issue Coastal Hazard Message, Special Weather Statements, and Surf Zone Forecast Products During Tropical Cyclone Events Effective on or about May 31, 2018
• Apr 10: SCN18-37: Changes to the Boundaries of Fire Weather Forecast Zones in Western Wyoming Effective June 25, 2018
• Apr 10: SCN17-35 Updated: Changes to Access, Planned Termination of Common Alerting Protocol Version 1.1, and Operational Implementation of Common Alerting Protocol Version 1.2 No Sooner than July 1, 2018
• Apr 6: SCN18-12 Updated: Changes in Fire and Public Zones for WFO Melbourne, FL, Effective May 1, 2018
• Apr 4: SCN18-35: New TAF Service for Hattiesburg/Laurel Regional Airport (KPIB) in Moselle, MS, Effective July 19, 2018
• Apr 3: SCN18-31 Updated: Inclusion of Minor Additions to SPC Convective Outlook Text Products Effective April 26, 2018
• Apr 2: SCN18-34: Use of Mixed Case Text/95 ASCII Character Set in Selected WPC Forecast Discussion Products Effective May 2, 2018
• Apr 2: SCN18-33: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Annette, AK, Effective on or about May 1, 2018
• Mar 29: SCN18-32: Changes to Southeast Alaska Climate Products Effective on or about May 1, 2018
• Mar 27: SCN17-122 Updated: Changes in Fire and Public Zones for NWS Weather Forecast Office Jacksonville, FL, St. Johns and Flagler Counties, Effective May 1, 2018
• Apr 3: SCN18-31 Updated: Inclusion of Minor Additions to SPC Convective Outlook Text Products Effective April 26, 2018
• Mar 27: SCN18-22 Updated: Experimental Grids for the 0.25 Inch (~6 mm) Threshold of the Day 4-7 Winter Weather Outlook will Become an Operational Element in the NDFD for the CONUS Effective on or about April 3, 2018
• Mar 23: SCN18-30: WSR-88D Mid-Volume Rescan of Low-Level Elevations Field Test to Begin on or around May 14, 2018
• Mar 20: SCN17-101 Updated: Changes to LAMP Station-Based and Gridded Guidance Effective January 25, 2018
• Mar 15: SCN18-29 Updated: Mixed Case Messaging for Seasonal Hurricane Outlook in AWIPS in Late May 2018
• Mar 14: SCN18-29: Mixed Case Messaging for Seasonal Hurricane Outlook in AWIPS in Late May 2018
• Mar 9: SCN18-28: Ending TAFs at the Gage, OK, (KGAG) and Hobart, OK, (KHBR) Effective March 21, 2018
• Mar 9: SCN18-27: Implementation of TAF Service for Modesto (KMOD) and McClellan (KMCC), CA, Effective May 31, 2018
• Mar 9: SCN18-26: Four NWS WFOs will Stop Issuing Local Tropical Cyclone Forecast Products Effective on or about June 1, 2018
• Mar 9: SCN18-25: Four NWS WFOs will Begin Issuing Tropical Cyclone Forecast Products Effective on or about June 1, 2018
• Mar 8: SCN18-24: Transition of Manual Radiosonde Observations to Automated Radiosonde Observations at Fairbanks, Alaska, WMO# 70261 Effective on or about April 1, 2018
• Mar 6: SCN18-23: Discontinuation of the MRX Tennessee Basin Lake Stages and Forecasts Effective April 06, 2018
• Feb 27: SCN17-114 Updated: Resumption of Overnight Mesoscale Precipitation and Model Diagnostics Products During the Warm Season from WPC Effective March 12, 2018
• Mar 27: SCN18-22 Updated: Experimental Grids for the 0.25 Inch (~6 mm) Threshold of the Day 4-7 Winter Weather Outlook will Become an Operational Element in the NDFD for the CONUS Effective on or about April 3, 2018
• Feb 23: SCN18-21: Transition of Experimental WPC Day 4-7 Web-based Winter Weather Outlook to Operational Status on or about March 27, 2018
• Feb 23: SCN18-20: NHC and CPHC to Begin Issuing 48-hour 64-knot Wind Radii Forecasts Effective on or around May 15, 2018
• May 16: SCN18-19 Updated: Format for the Reconnaissance Vortex Data Message Changing on or around June 1, 2018
• Feb 23: SCN18-18: Changes to Tropical Cyclone Public Advisory Products Beginning on or around May 15, 2018
• Feb 12: SCN18-17: Add GOES-East Level 2 Derived Products to the SBN or NOAAPort Effective February 28, 2018
• Feb 6: SCN18-16: Upgrade of National Water Model Effective March 6, 2018
• Feb 2: SCN18-15: Changes in Fire and Public Zones for NWS Weather Forecast Office Houston, TX, Effective May 1, 2018
• Feb 2: SCN18-14: Changes in Fire and Public Zones for WFO Amarillo, TX, Effective May 1, 2018
• Apr 13: SCN18-13 Updated: Implementing Improved Public and Fire Zone Coverage for WFO Brownsville/Rio Grande Valley, TX, Effective May 1, 2018
• Apr 13: SCN18-12 Updated: Changes in Fire and Public Zones for WFO Melbourne, FL, Effective May 1, 2018
• Feb 1: SCN18-11: Implementation of TAF Service for Battle Mountain Airport (KBAM) in Nevada Effective April 24, 2018
• Feb 1: SCN18-10: NWS West Gulf RFC will Discontinue Issuing its Text Hydrometerological Discussion Product Effective March 1, 2018
• Jan 26: SCN18-09: Termination of the National Convective Weather Diagnostic and Forecast Product on March 31, 2018
• Jan 26: SCN17-117 Updated: Transition to Operational Status of Offshore and High Seas Gridded Forecasts from the NHC TAFB and the Offshore Gridded Forecasts from the OPC in the Atlantic Basin Effective February 6, 2018
• Jan 25: SCN18-08: Termination of Ensemble Kernel Density MOS (EKDMOS) Dissemination over the SBN Effective April 12, 2018
• Jan 24: SCN17-105 Updated: RTMA, URMA and NAM DNG Upgrade and Introduction of RTMA with Rapid Updates Effective February 7, 2018
• Jan 24: SCN18-07: Use of Mixed-Case Text/95 ASCII Character Set and Removal of Coded Isohyet Points in the Quantitative Precipitation Forecast Discussion Effective February 26, 2018
• Jan 19: SCN17-112 Updated: Polygon-based Snow Squall Warnings to Begin on or about January 31, 2018, for Select Offices and Polygon-based Dust Storm Warnings and Dust Advisory Product Operational Demonstration at Select WFOs on or about June 20, 2018
• Jan 18: SCN18-06: Changes to the Surface Analyses and Surface Forecast Charts Produced by the OPC, TAFB and WFO Honolulu and Addition of 72-hour Surface and Wind/Wave Forecast Charts by OPC Effective March 7, 2018
• Jan 12: SCN17-111 Final Update: Change in Satellite Broadcast Network (SBN) Effective from December 5, 2017, to January 16, 2018
• Jan 12: SCN18-05: Implementation of New Extratropical Surge and Tide Operational Forecast System for Micronesia Effective February 13, 2018
• Jan 12: SCN18-04: Correction to Global Forecast System (GFS) Model Station Time Series in the Binary Universal Form for Representation of Meteorological Data (BUFR) Output Effective January 10, 2018
• Jan 5: SCN18-03: Implementation of Temporary TAF Service for Minnesota Sites, Effective February 1-6, 2018
• Jan 4: SCN18-02: Implementation of TAF Service for Yampa Valley Regional Airport (KHDN) Hayden, CO, Effective: March 21, 2018
• Jan 4: SCN17-125 Updated: Updating National Ocean Service's Oceanographic Forecast Modeling Systems Effective Jan 10, 2018
• Jan 3: SCN17-137 Updated: Assimilation of GOES-16 AMV Data into GDAS/GFS Effective January 5, 2018
• Jan 2: SCN18-01: Addition of ESTOFS Atlantic SHEF Effective January 31, 2018
• Jan 2: SCN17-84 Updated: The Nearshore Wave Prediction System (NWPS) Upgrade v1.2 will be Provided over SBN and NOAAPORT on or about January 17, 2018

For older PNS, SCNs and TINs see our archive: https://www.weather.gov/notification/archive