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
2020-08-1633925GLDSevere Thunderstorm Warning 243
2012-07-0333312DLHSevere Thunderstorm Warning 85
2015-04-2732444EWXSevere Thunderstorm Warning 76
2009-07-0929896BISSevere Thunderstorm Warning 121
2020-08-2129755GGWSevere Thunderstorm Warning 74
2008-08-1929684OTXSevere Thunderstorm Warning 30
2020-07-0828930GGWSevere Thunderstorm Warning 50

Top 10 Smallest for WFO: ALL

Date IssuedSize (sq km)WFOPhenomena
2008-03-050.00AKQSevere Thunderstorm Warning 7
2011-06-030.00FGFSevere Thunderstorm Warning 25
2012-07-020.00HUNSevere Thunderstorm Warning 136
2011-04-040.00MRXTornado Warning 10
2010-08-200.00GRBSevere Thunderstorm Warning 83
2010-11-170.00AKQSevere Thunderstorm Warning 161
2013-06-010.01INDSevere Thunderstorm Warning 66
2008-06-010.01RNKSevere Thunderstorm Warning 103
2011-06-220.01SJTSevere Thunderstorm Warning 148
2011-09-040.02ILNSevere Thunderstorm Warning 355