| DATE | CYCLE | CHANGES |
| September 16, 2008 | 1200 UTC |
MDL adds temperature and dewpoint temperature to the Pacific MOS guidance.
More details |
| August 12, 2008 | 1200 UTC |
MDL stops the cycle-averaging of station data in the GFS-based CONUS gridded MOS wind forecasts.
More details |
| June 10, 2008 | 1200 UTC |
MDL begins producing Gridded MOS guidance for Alaska on the 3 km NDFD grid.
More details |
| Dec 18, 2007 | 1200 UTC |
MDL makes modifications to the CONUS gridded MOS guidance -- 1) new land/water mask, 2) new QPF analysis scheme, and 3) removal of problem
stations from analysis.
More details |
| Sept 11, 2007 | 1200 UTC |
MDL updates max/min climate normals for the CONUS stations in the MEX text product and increases the number of stations in the GFS-based vi
sibility, obstruction to vision and probability of precipitation occurrance guidance.
More details |
| June 5, 2007 | 1200 UTC |
MDL replaces Total Sky Cover guidance in short-range GFS MAV MOS with new Opaque Sky Cover guidance.
More details, Verification |
| June 5, 2007 | 1200 UTC |
MDL adds opaque sky cover, wind gusts, 24-h snowfall, and 6-h and 12-h Quantitative Precipitation Forecasts (QPF) to the Gridded MOS system. Also, MDL upgrades processing of previously existing elements, and expands forecast guidance coverage.
More details. |
| April 24, 2007 | 1200 UTC |
MDL adds Probability of Precip (POP) and Probability of Precip Occurrance (POPO) to the GFS MOS guidance for the 15 island locations in the Western Pacific Ocean.
More details. |
| August 15, 2006 | 1200 UTC |
MDL begins producing Gridded MOS guidance on the 5km NDFD grid.
More details. |
| August 15, 2006 | 1200 UTC |
MDL removes obsolete short-range GFS BUFR products.
More details. |
| August 15, 2006 | 1200 UTC |
MDL adds 88 stations to the GFS MOS BUFR and text products.
new station list,
Text details,
BUFR details. |
| July 11, 2006 | 1200 UTC |
MDL modifies GFS-based extended-range wind guidance and adds WND to 12Z MEX text product.
More details. |
| June 20, 2006 | 1200 UTC |
The NWS will run an interim 32-km Eta model for the 0000 and 1200 UTC forecast cycles. Model output from this Eta run will be used as input to the Eta MOS. Direct Eta model output will no longer be available on NWS servers. More details. |
| June 20, 2006 | 1200 UTC |
MDL implements new maximum/minimum temperature, 2-m temperature, dew point, wind, and wind gust equations to generate guidance for all cycles of the GFS-based short- and extended-range MOS guidance. This should reduce the differences between the accuracy and character of the 00Z and 12Z MOS guidance. In addition, about 90 new stations were added to the equations. These new stations will be available in August 2006 - See Above.
|
| June 20, 2006 | 1200 UTC |
MDL adds GFS-based maximum/minimum temperature guidance text product for Alaskan RFC.
More details. |
| June 20, 2006 | 1200 UTC |
MDL changes the inflation technique applied to the wind speed forecasts in the GFS- and Eta-based MOS guidance. We will no longer inflate wind speed forecasts, when the forecasts are below the mean wind speed. The result will be fewer forecasts of calm winds. Wind speeds forecast above the mean wind speed will still be inflated. More details
|
| May 30, 2006 | 1200 UTC |
MDL modifies experimental ensemble messages to respond to NCEP's global ensemble upgrade.
|
| Apr 25, 2006 | 1200 UTC |
MDL's probability of thunderstorm guidance now based on a 40km grid instead of the original 47km grid. Thunderstorm guidance now available out to 192 hours in 1200 UTC MEX text product.
More details. |
| Nov 1, 2005 | 1200 UTC |
MDL adds visibility and obstruction to vision guidance to the Eta MOS.
More details. |
| Nov 1, 2005 | 1200 UTC |
MDL changes the station identifier for Kalispell, MT from KFCA to KGPI in our GFS and Eta-based text products. The NGM-based text product will change from FCA to GPI.
More details. |
| Oct 11, 2005 | 1200 UTC |
MDL begins producing new extended-range GFS-based MOS BUFR products at 0000 and 1200 UTC.
More details. |
| Sept 27, 2005 | 1200 UTC |
MDL removes obsolete NGM-MOS-based Redbook graphics.
More details. |
| Sept 27, 2005 | 1200 UTC |
MDL adds extended-range GFS-based text product for US and Canadian sites for the 1200 UTC model run.
More details. |
| June 7, 2005 | 1200 UTC |
MDL adds wind speed and direction guidance for 13 island locations in the Western Pacific Ocean to the GFS-based short-range MOS at 0000 and 1200 UTC.
More details. |
| April 19, 2005 | 1200 UTC |
MDL adds wind speed and direction guidance for 2 Pacific Ocean sites to the GFS-based short-range MOS at 0000 and 1200 UTC.
More details. |
| February 8, 2005 | 1200 UTC |
MDL modifies GFS-based short-range MOS guidance BUFR products.
More details. |
| February 8, 2005 | 1200 UTC |
MDL begins disseminating Eta-based MOS guidance in BUFR format.
More details. |
| February 8, 2005 | 1200 UTC |
MDL begins Eta-based MOS temperature and wind guidance for marine sites.
More details. |
| February 8, 2005 | 1200 UTC |
MDL sends GFS-based max/min MOS guidance for cooperative observer sites on the SBN. 1200 UTC cycle extended-range message added.
More details. |
| January 11, 2005 | 1200 UTC |
All NGM-based trajectory products removed except for Redbook graphics of net vertical displacements and trajectories.
More details. |
| November 18, 2004 | 1200 UTC |
Graphical depictions of the GFS- and Eta-based snowfall forecasts are added to our webpages.
More details. |
| September 21, 2004 | 1200 UTC |
Air temperature and dew point temperature added to the GFS MOS marine text products.
More details. |
| September 21, 2004 | 1200 UTC |
Change to Dennison, TX station identifier in short- and extended-range GFS MOS text products.
More details in NWS Technical Information Notice 04-29. |
| September 21, 2004 | 1200 UTC |
Several modifications made to GFS-based RFC MOS max/min temperature text product format and station content.
More details in NWS Technical Information Notice 04-28. |
| September 21, 2004 | 1200 UTC |
NGM MOS BUFR messages no longer segmented internally.
More details in NWS Technical Information Notice 04-31. |
| May 26, 2004 | 0000 UTC |
Extended-range GFS MOS guidance production time moved from 0700 UTC to 0500 UTC.
More details in NWS Technical Information Notice 04-11. |
| May 25, 2004 | 1200 UTC |
MDL officially started producing short- and extended-range GFS-based COOP MOS max/min temperature text products. Test guidance had been available since December 2003. Products also made available on NWS FTP server.
More details here. |
| May 18, 2004 | 1200 UTC |
GFS short-range MAV MOS visibility, ceiling height, and sky cover definitions changed.
More details in NWS Technical Information Notice 04-09 |
| April 20, 2004 | 1200 UTC |
66- and 72-hr forecasts added to Eta MET text message.
|
| February 24, 2004 | 1200 UTC |
Changes are being made to the Eta MOS content, including the format of the bulletin and the stations available. Snowfall amount and ceiling height guidance are being added. All the details of the February 2004 Eta changes are outlined
here |
| February 17, 2004 | 1200 UTC |
The Eta MOS forecast equations have been updated. As a result, the guidance delivery time will be delayed by approximately 30 minutes. In addition, some of the sites in the messages have been modified. All the details are outlined
here |
| December 19, 2003 | 1200 UTC |
MDL begins producing test forecasts of GFS MOS maximum/minimum temperature guidance based on data from cooperative observer network data. At this time the guidance is available only on our webpage. All the details are outlined
here |
| December 16, 2003 | 1200 UTC |
MDL makes several significant changes to the GFS MOS, including new stations, new equations, new snowfall amount forecasts, and unifying the AVN and MRF MOS into the GFS MOS system. All the details are outlined
here |
| May 6, 2003 | 1200 UTC |
MDL began producing new Marine MOS wind guidance based on the GFS model.
more details |
| April 8, 2003 | 0000 UTC |
The obsolete MRF MOS products (AWIPS category FMR) were removed from production. The alphanumeric, grib, and
graphics products are no longer available. These products have been
replaced with the improved MRF MOS (AWIPS category MEX) guidance.See change notice |
| October 1, 2002 | 0000 UTC |
Improved AVN POP and QPF guidance for Hawaii will be implemented on October 1, 2002.
more details |
| September 18, 2002 | 0000 UTC |
New medium range wind guidance is being added to the MRF MOS messages.
more details |
| September 17, 2002 | 1200 UTC |
Visibility and obstruction to vision will be added to the 0600/1800 UTC AVN MOS guidance, and the probability of precipitation occurrence (PoPO) will be added for all four cycles of the AVN-based MOS guidance.
more details |
| September 17, 2002 | 1200 UTC |
Eta-based MOS guidance is being updated to include new thunderstorm and severe weather guidance. more details |
| September 16, 2002 | ----- |
Changed Text Message by Station List web page forms posting method from POST to GET to allow automated retrieval and easier bookmarking.more details |
| August 21, 2002 | ----- |
All MDL data available via ftp will be moved from tgsv1.nws.noaa.gov to tgftp.nws.noaa.gov. more details |
| July 30, 2002 | 1200 UTC |
MDL adds climatological values of max/min temperature and PoP for some sites to the MRF MEX MOS message.more details |
| July 25, 2002 | 1200 UTC |
NCEP has scheduled their quarterly test of their back-up systems. Some 1200 UTC products may be disseminated late or not at all. |
| June 11, 2002 | 1200 UTC |
MDL starts disseminating new MOS guidance based on the Eta model. more details |
| May 21, 2002 | 1800 UTC |
A correction is made to the 12-h PoP and QPF forecasts for the Hawaiian sites in the 0600 and 1800 UTC AVN MAV alphanumeric messages. |
| May 14, 2002 | 1200 UTC |
Updated FOUS12 guidance is produced for the remaining four RFCs. Day 11 minimum temperatures added to all 9 RFC messages. |
| April 30, 2002 | 0000 UTC |
The obsolete AVN MOS products (AWIPS category FAN) will be removed from production. The alphanumeric, grib, and
graphics products will no longer be available after April 30, 2002. These products have been
replaced with the improved AVN MOS (AWIPS category MAV) guidance.See change notice |
| April 24, 2002 | 0000 UTC |
On March 6, 2002, NCEP changed the configuration of the Global Forecast System (GFS) to provide four runs
of the Global Spectral Model for forecast projections out to 384 hours.
Since the changes made on March 6 provide four extended runs of the GFS, NCEP is terminating the MRF,
effective April 24, 2002.
The impact of these changes on the current suite of AVN and MRF MOS guidance is minimal.
More Details |
| April 18, 2002 | 1800 UTC |
MDL has begun producing QPF guidance as part of the 0600 and 1800 UTC AVN MAV MOS package. |
| April 4, 2002 | 0000 UTC |
NCEP has scheduled a test of their back-up systems. Therefore 0000 UTC NGM and AVN MOS are expected to be disseminated approximately 6 hours late. |
| April 2, 2002 | 1400 UTC |
MDL's webpages will be moved to the NWS's upgraded web server.
more details |
| April 2, 2002 | 1200 UTC |
MDL will begin producing MOS guidance for max/min temperature, surface temperature, dewpoint, and cloud cover as part of the experimental Eta MOS package.
more details |
| April 2, 2002 | 1200 UTC |
MDL will begin putting graphical images of the AVN MAV, MRF MEX and experimental ETA MOS forecasts on the webpage.
more details |
| March 21, 2002 | 1200 UTC |
MDL begins putting experimental Eta MOS text messages on the webpage. more details
|
| January 22, 2002 | 1200 UTC |
MDL adds 323 new sites to the new AVN and MRF MOS guidance. more details |
| December 11, 2001 | 1200 UTC |
FOUS12 max/min guidance for the North Central RFC has been converted from the old NGM/MRF MOS to the new AVN/MRF MOS. more details |
| November 27, 2001 | 1800 UTC |
Maximum/minimum temperature, surface temperature, dew point, probability of thunderstorms, and conditional probability of severe thunderstorm guidance added to the 0600/1800 UTC AVN MOS. more details |
| November 27, 2001 | 1200 UTC |
Updated equations for maximum/minimum temperature, surface temperature, and dew point are implemented for the 0000/1200 UTC AVN MOS guidance. |
| October 30, 2001 | 1800 UTC |
Probability of Precipitation (PoP) will be added to the 0600/1800 UTC AVN MOS guidance. More details about recent and upcoming changes |
| October 16, 2001 | 1800 UTC |
MDL began producing new 0600/1800 UTC AVN MOS guidance
packages for the same sites and in the same format as the current 0000/1200 UTC packages, but
not all elements are currently available. Please note that the same product identifiers are
used as with the 0000/1200 UTC packages. more details |
| October 10, 2001 | 1200 UTC |
The 1200 UTC AVN MOS guidance will NOT be available on Wednesday, October 10th, 2001
due to the NCEP site outage backup test. more details |
| September 25, 2001 | 1200 UTC |
MDL has begun producing new Air Force alphanumeric bulletins.
These products do not contain any new guidance, but are a repackaging of existing MEX or MAV messages for a subset of stations.
more details |
| July 24, 2001 | 1200 UTC |
MDL has begun producing guidance for categorical forecasts of precipitation amount (QPF) in the AVN MOS alphanumeric messages.
In addition, the equations used to produce the visibility and obstruction to vision guidance have been updated. more details |
| June 25, 2001 | 1200 UTC | MDL has begun producing
test AVN MAV alphanumeric messages containing QPF guidance. more details |
| June 19, 2001 | 1200 UTC |
The 1200 UTC AVN MOS guidance will NOT be available on Tuesday, June 19th, 2001
due to the NCEP site outage backup test. more details |
| May 15, 2001 | 1200 UTC | NCEP's changes to the physics package of the Global Spectral Model expected to impact the new AVN and MRF MOS. more details |
| May 9, 2001 | 0000 UTC | 12- and 24-h Probability of Thunderstorms added to the MRF MOS guidance. more details |
| May 2, 2001 | 1200 UTC | Updated FOUS12 max/min temp guidance for RFCs is produced and disseminated. more details |
| April 3, 2001 | 1200 UTC | BUFR messages containing new AVN(MAV) and MRF(MEX) MOS forecasts are produced and disseminated. more details |
| April 1, 2001 | 0000 UTC | Warm season AVN MAV/MRF MEX forecast equations take effect. more details |
| March 16, 2001 | 0000 UTC | Spring AVN MAV thunderstorm and severe weather equations take effect. |
| February 27, 2001 | 0000 UTC | Experimental MOS guidance based on output from the 0000 UTC Ensemble runs of the MRF made available. more details |
| February 12, 2001 | 1200 UTC | Enhancements made to AVN Visibility, Obstruction to Vision, and Conditional Probability of Severe Thunderstorm guidance. more details |
| October 10, 2000 | 1200 UTC | Visibility and
Obstruction to Vision guidance added to AVN MOS. |
| October 8, 2000 | ----- | NWS Headquarters restructure effective. TDL becomes the
Meteorological Development Laboratory (MDL). The Synoptic Scale Techniques Branch (SSTB) becomes the
Statistical Modeling Branch. |
| October 4, 2000 | 0000 UTC | Precipitation Type and
Mean Total Sky Cover added to the MRF MOS. |
| September 20, 2000 | 1200 UTC | Severe Weather and
Probability of Precipitation (PoP) added to AVN MOS. more details |
| July 19, 2000 | 0000 UTC | Probability of Precipitation (PoP) and
Quantitative Precipitation Forecasting (QPF) added to
MRF MOS. more details |
| July 18, 2000 | 1200 UTC | Precipitation Type and Total
Sky Cover added to AVN MOS. more details |
| May 31, 2000 | 0000 UTC | New MRF MOS issued including
Maximum/Minimum Temperature, Temperature, and Dewpoint. more details (includes AWIPS ID and WMO Headers) |
| May 30, 2000 | 1200 UTC | New AVN MOS issued including
Maximum/Minimum Temperature, Temperature, Dewpoint, and Winds. more details (includes AWIPS ID and WMO Headers) |
| August 1999 | ----- | Synoptic Scale Techniques Branch (SSTB) of TDL
enhances webpage at "www.nws.noaa.gov/mdl/synop".
|
weather.gov 
