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.

Updated:  SPC Mesoscale Analysis Page has been extensively revised! 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. This new format is expected to replace the existing set of pages on April 13, 2010.

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

Note:  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.

Severe Weather GIS (SVRGIS) page has been updated with tornadoes (1950-2008), hail/wind (1955-2008) reports converted into shapefile (.shp) format. Visit http://www.spc.noaa.gov/gis/svrgis/ for details.