Severe Thunderstorm Warnings in Iowa
20,090 severe thunderstorm warnings since 1986. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Severe Thunderstorm Warnings
- 20,090
- Busiest year
- 20081,012 severe thunderstorm warnings
- Average year
- 490over 41 years on file
Over time
By year
Before October 2007 these were issued for whole counties, and a storm crossing three counties was often three warnings; since then one polygon follows the storm. The count changed with the practice, not only with the weather.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Pottawattamie County937
- Harrison County716
- Mills County672
- Polk County667
- Jasper County607
- Plymouth County602
- Dallas County598
- Warren County586
- Sioux County582
- Fremont County577
- Linn County569
- Adair County564
- Woodbury County557
- Madison County545
- Marion County533
- Guthrie County532
- Story County528
- Clinton County527
- Scott County523
- Monona County521
- Webster County511
- Boone County506
- Lyon County501
- Montgomery County488
- Marshall County487
- Cedar County480
- Greene County480
- Jones County471
- Cherokee County466
- Johnson County464
- Page County460
- Jackson County457
- Kossuth County454
- Shelby County444
- Cass County441
- Benton County440
- Union County440
- O'Brien County439
- Hamilton County432
- Carroll County431
59 more counties
- Clay County431
- Clarke County428
- Calhoun County422
- Dubuque County421
- Mahaska County416
- Lucas County412
- Delaware County411
- Muscatine County409
- Tama County402
- Hardin County401
- Lee County401
- Adams County397
- Washington County396
- Wright County390
- Grundy County382
- Buchanan County380
- Franklin County380
- Audubon County379
- Louisa County376
- Ringgold County376
- Decatur County363
- Monroe County362
- Pocahontas County361
- Osceola County360
- Poweshiek County360
- Des Moines County358
- Buena Vista County357
- Black Hawk County356
- Hancock County355
- Henry County351
- Wayne County351
- Crawford County350
- Taylor County344
- Cerro Gordo County343
- Iowa County341
- Humboldt County331
- Sac County331
- Jefferson County330
- Van Buren County329
- Dickinson County327
- Butler County324
- Appanoose County320
- Palo Alto County320
- Ida County316
- Keokuk County304
- Wapello County304
- Clayton County284
- Davis County277
- Fayette County268
- Winnebago County266
- Winneshiek County266
- Emmet County255
- Worth County253
- Mitchell County238
- Bremer County237
- Allamakee County235
- Howard County227
- Chickasaw County214
- Floyd County214
The latest severe thunderstorm warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 2:21 AM CDT | Severe Thunderstorm Warning | DVN | Clinton, Muscatine, Scott | 27 min |
| Sep 20, 1:18 AM CDT | Severe Thunderstorm Warning | DVN | Cedar, Henry, Jefferson, Johnson, Keokuk, Louisa and 3 more | 57 min |
| Sep 19, 7:30 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 30 min |
| Sep 19, 7:23 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 37 min |
| Sep 19, 6:52 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Ringgold | 38 min |
| Sep 15, 2:01 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Guthrie | 29 min |
| Sep 15, 1:43 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Audubon, Cass, Guthrie | 32 min |
| Sep 15, 12:54 AM CDT | Severe Thunderstorm Warning | OAX | Harrison, Pottawattamie, Shelby | 66 min |
| Sep 15, 12:38 AM CDT | Severe Thunderstorm Warning | OAX | Harrison, Pottawattamie | 37 min |
| Sep 15, 12:22 AM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 38 min |
| Sep 15, 12:07 AM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 23 min |
| Sep 14, 9:58 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Montgomery, Page | 49 min |
Nearby
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Rebuilt daily.