Daily Storm Based Warning Summaries
This application displays an image summary of NWS Storm Based Warnings for a given UTC date (0z to 0z). This summary is based on an archive the IEM maintains and may contain errors. Also, prior to 1 October 2007, these warnings were not official and their shapes may or may not have been considered by the issuing forecaster. This page works for dates between 1 Jan 2002 and 01 Dec 2023. Areas are computed and polygons shown using a US National Atlas Equal Area projection (EPSG:2163).
Red text indicates less than 25% reduction in size
Green text indicates greater than 75% reduction in size