Note:  On April 19, 2011 SPC began issuing the Experimental Probabilistic Day 3-8 Fire Weather Outlooks. Please read the Product Description Document (PDD) and provide feedback using this link: http://www.weather.gov/survey/nws-survey.php?code=spc38firewx.

Updated:  Severe Weather GIS (SVRGIS) page has been updated with tornadoes (1950-2010), hail/wind (1955-2010) reports converted into shapefile (.shp) format. Visit http://www.spc.noaa.gov/gis/svrgis/ for details.

Note:  Beginning March 15, 2011, the SPC will provide multimedia weather briefings on an experimental basis for most Moderate and all High Risk severe weather days during the Day 1 period. As a supplement to the Public Severe Weather Outlook (PWO), these once-per-day recorded briefings will be available during the early morning hours (approximately 6:00-10:30AM Central Time) on the SPC website.

Note:  On March 8, 2011, the SPC removed space/time filtering on incoming National Weather Service (NWS) Local Storm Reports (LSRs). This filtering had been used by SPC in an attempt to reduce duplicate reports and limit artificially inflated initial estimates of severe weather events when many reports arrived for the same event. Space/time filtering is no longer being applied to decoded NWS LSRs and this approach is consistent with NWS storm-based verification methods. However, identical reports should still be removed from SPC logs and should not appear on the preliminary maps and lists.

The Experimental Thunderstorm Outlooks product will continue to be issued through winter. Please click here for the Product Description Document (PDD). Please click here to take the survey. Public comment period ends on September 30, 2011.

The Mesoscale Analysis page has been substantially redesigned. Several additions and improvements have been added, such as image overlays, larger images, and fixed sector areas that permanently cover the entire contiguous United States. For more information, visit the Mesoscale Analysis Page, or download a MPEG4 video clip here. (5.8MB)

The Storm Prediction Center is one of the initial participants in the NWS experimental email updates service. The SPC products available with email updates are: Tornado/Severe Thunderstorm Watches and Watch Status updates, Mesoscale Discussions, Day 1, 2, 3 and 4-8 Convective Outlooks, Day 1, 2 and 3-8 Fire Weather Outlooks. More info.

Effective Tuesday March 23, 2010, the SPC began issuing fire weather products during the daylight hours. Click here for more details.

Note:  Starting January 5, 2010, the daily storm report summaries will record 1 inch and greater diameter hail, as well as severe thunderstorm wind and tornado reports. Please see this link for more information.

Public Severe Weather Outlooks for nighttime tornado potential will be issued December 1 through March 31. More information here.

Day 4-8 Convective Outlook NDFD grid became operational December 1, 2009. Click here for the Product Description Document. Click here for the Technical Implementation Notice 09-38.