Top 10 NWS WFO Storm Based Warnings by Size

This application prints out a listing of the top 10 largest and smallest storm based warnings by Weather Forecast Office (WFO). You can click the Event ID to get more information on that warning. This page defaults to show the largest and smallest warnings from any WFO. Storm Based Warnings did not become operational until 1 Oct 2007, so warning polygons prior to that date were only experimental at best. The areas shown are computed using EPSG:2163 (US National Atlas Equal Area).

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Top 10 Largest for WFO: ALL

Date IssuedSize (sq km)WFOPhenomena
2009-07-0939717BISSevere Thunderstorm Warning 119
2009-07-0937902BISSevere Thunderstorm Warning 116
2013-09-0635499PDTSevere Thunderstorm Warning 38
2012-07-0333312DLHSevere Thunderstorm Warning 85
2015-04-2732444EWXSevere Thunderstorm Warning 76
2009-07-0929896BISSevere Thunderstorm Warning 121
2008-08-1929684OTXSevere Thunderstorm Warning 30
2012-08-1528179TFXSevere Thunderstorm Warning 72
2009-06-2727923BISSevere Thunderstorm Warning 86
2013-05-2927516OUNSevere Thunderstorm Warning 410

Top 10 Smallest for WFO: ALL

Date IssuedSize (sq km)WFOPhenomena
2009-03-293.54MHXTornado Warning 6
2015-07-115.52MHXSevere Thunderstorm Warning 38
2016-01-157.80MFLSevere Thunderstorm Warning 2
2014-04-198.91MFLSevere Thunderstorm Warning 8
2008-06-229.85OKXSevere Thunderstorm Warning 49
2015-04-0810.28JKLSevere Thunderstorm Warning 18
2011-06-1012.61PAHSevere Thunderstorm Warning 237
2009-04-2214.47MHXSevere Thunderstorm Warning 20
2008-09-1014.58KEYTornado Warning 15
2009-05-2716.73MOBSevere Thunderstorm Warning 203