IEM :: Storm Based Warning Stats

Storm Based Warning Geometry Statistics

Pick a time period of your choice and get back a summary table of storm based warning polygon statistics. You should be able to highlight this table and paste it into Excel, if you wish. Please note that prior to formal implementation of Storm Based Warnings, the polygons were not the official warning and so their shape may not have been accurately representing the threat.
Note: Areal flood warning polygons have only been issued since summer of 2007.
Perimeter values are in kilometers and area values in square kilometers.
Links: Download shapefile of these warnings - View visual summaries

	Year	Month	Day	Hour
Start:
End:

Data valid for warnings issued between 14 Jan 2026 00:00 and 15 Jan 2026 00:00 UTC
Weather Forecast Office		Summary			Tornado			Severe Thunderstorm			Marine			Flash Flood			Areal Flood			Dust Storm			Snow Squall
ID	Name	Cnt	Perim	Area	Cnt	Perim	Area	Cnt	Perim	Area	Cnt	Perim	Area	Cnt	Perim	Area	Cnt	Perim	Area	Cnt	Perim	Area	Cnt	Perim	Area
HFO	Honolulu	1	322.3	3455.8	0	0.0	0.0	0	0.0	0.0	1	322.3	3455.8	0	0.0	0.0	0	0.0	0.0	0	0.0	0.0	0	0.0	0.0
ILX	Lincoln	3	331.2	4666.7	0	0.0	0.0	0	0.0	0.0	0	0.0	0.0	0	0.0	0.0	0	0.0	0.0	0	0.0	0.0	3	331.2	4666.7
IWX	Northern Indiana	1	380.7	6666.6	0	0.0	0.0	0	0.0	0.0	0	0.0	0.0	0	0.0	0.0	0	0.0	0.0	0	0.0	0.0	1	380.7	6666.6
LOT	Chicago	4	300.3	4225.5	0	0.0	0.0	0	0.0	0.0	1	212.8	2703.4	0	0.0	0.0	0	0.0	0.0	0	0.0	0.0	3	329.5	4732.9
	Total/Averages	9	322.0	4558.3	0	0.0	0.0	0	0.0	0.0	2	267.6	3079.6	0	0.0	0.0	0	0.0	0.0	0	0.0	0.0	7	337.5	4980.7