Iowa Environmental Mesonet
Iowa State University Department of Agronomy
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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.
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Top 10 Largest for WFO: ALL
| Date Issued | Size (sq km) | WFO | Phenomena |
|---|---|---|---|
| 2009-07-09 | 39717 | BIS | Severe Thunderstorm Warning 119 |
| 2009-07-09 | 37902 | BIS | Severe Thunderstorm Warning 116 |
| 2009-07-09 | 29896 | BIS | Severe Thunderstorm Warning 121 |
| 2008-08-19 | 29684 | OTX | Severe Thunderstorm Warning 30 |
| 2009-06-27 | 27923 | BIS | Severe Thunderstorm Warning 86 |
| 2010-05-25 | 27340 | ABR | Severe Thunderstorm Warning 54 |
| 2009-02-12 | 25385 | CTP | Severe Thunderstorm Warning 2 |
| 2011-02-01 | 25134 | HGX | Severe Thunderstorm Warning 11 |
| 2011-07-22 | 23692 | GGW | Severe Thunderstorm Warning 104 |
| 2009-02-12 | 23321 | PBZ | Severe Thunderstorm Warning 7 |
Top 10 Smallest for WFO: ALL
| Date Issued | Size (sq km) | WFO | Phenomena |
|---|---|---|---|
| 2009-03-29 | 3.54 | MHX | Tornado Warning 6 |
| 2008-06-22 | 9.85 | OKX | Severe Thunderstorm Warning 49 |
| 2011-06-10 | 12.61 | PAH | Severe Thunderstorm Warning 237 |
| 2009-04-22 | 14.47 | MHX | Severe Thunderstorm Warning 20 |
| 2008-09-10 | 14.58 | KEY | Tornado Warning 15 |
| 2009-05-27 | 16.73 | MOB | Severe Thunderstorm Warning 203 |
| 2011-08-18 | 16.90 | ILM | Tornado Warning 28 |
| 2011-10-18 | 19.08 | KEY | Tornado Warning 2 |
| 2011-08-18 | 19.47 | ILM | Tornado Warning 27 |
| 2008-09-01 | 20.25 | TAE | Tornado Warning 58 |