Alert archive / Iowa / Severe Thunderstorm Warnings / 2018
Severe Thunderstorm Warnings in Iowa, September 2018
69 severe thunderstorm warnings in September 2018. 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 in September 2018. Tap one for its archive.
- Severe Thunderstorm Warnings
- 69
- Busiest day
- September 2, 201818 severe thunderstorm warnings
Over time
By day
Days in UTC, the clock the archive keeps.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 10:09 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Cass | 51 min |
| Aug 31, 10:55 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Mahaska, Marion, Poweshiek | 50 min |
| Sep 1, 1:01 AM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 22 min |
| Sep 1, 1:10 AM CDT | Severe Thunderstorm Warning | OAX | Montgomery | 35 min |
| Sep 1, 1:12 AM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware, Linn | 29 min |
| Sep 1, 1:28 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Adams, Cass, Union | 47 min |
| Sep 1, 5:36 AM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery, Pottawattamie | 24 min |
| Sep 1, 5:45 AM CDT | Severe Thunderstorm Warning | DMX | Clarke, Madison, Union, Warren | 29 min |
| Sep 1, 5:58 AM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery, Pottawattamie | 32 min |
| Sep 1, 6:19 AM CDT | Severe Thunderstorm Warning | OAX | Montgomery, Pottawattamie | 41 min |
| Sep 1, 6:30 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Adams, Cass | 45 min |
| Sep 1, 6:57 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Madison, Union | 48 min |
| Sep 1, 7:24 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Dallas, Guthrie, Madison, Polk, Warren | 51 min |
| Sep 1, 6:08 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Madison, Polk | 52 min |
| Sep 1, 7:07 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Polk, Story | 38 min |
| Sep 1, 7:14 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Polk, Story | 46 min |
| Sep 1, 7:36 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Polk | 54 min |
| Sep 1, 7:39 PM CDT | Severe Thunderstorm Warning | DVN | Keokuk | 36 min |
| Sep 1, 7:51 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Polk, Story | 39 min |
| Sep 1, 7:55 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills | 50 min |
| Sep 1, 8:14 PM CDT | Severe Thunderstorm Warning | DVN | Jefferson, Keokuk | 46 min |
| Sep 1, 8:16 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 14 min |
| Sep 1, 8:23 PM CDT | Severe Thunderstorm Warning | DVN | Keokuk | 37 min |
| Sep 1, 8:29 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills | 46 min |
| Sep 1, 8:50 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Polk, Story | 40 min |
| Sep 1, 9:05 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson, Washington | 40 min |
| Sep 1, 9:08 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson, Washington | 52 min |
| Sep 1, 9:08 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills, Montgomery, Page, Pottawattamie | 52 min |
| Sep 1, 9:22 PM CDT | Severe Thunderstorm Warning | DVN | Jefferson | 38 min |
| Sep 1, 9:56 PM CDT | Severe Thunderstorm Warning | OAX | Fremont | 34 min |
| Sep 1, 10:26 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Montgomery, Page | 34 min |
| Sep 2, 3:01 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware | 44 min |
| Sep 3, 6:21 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque | 39 min |
| Sep 4, 2:21 PM CDT | Severe Thunderstorm Warning | DMX | Palo Alto, Pocahontas | 14 min |
| Sep 4, 7:55 PM CDT | Severe Thunderstorm Warning | ARX | Howard | 53 min |
| Sep 17, 3:02 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Humboldt, Kossuth, Wright | 43 min |
| Sep 18, 11:47 AM CDT | Severe Thunderstorm Warning | DVN | Cedar, Johnson, Louisa, Muscatine, Scott, Washington | 58 min |
| Sep 18, 12:32 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Louisa | 58 min |
| Sep 18, 1:23 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines | 39 min |
| Sep 18, 2:12 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Cass | 48 min |
| Sep 18, 2:59 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Dallas, Guthrie, Madison | 46 min |
| Sep 18, 3:22 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold, Taylor | 38 min |
| Sep 18, 4:20 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Ringgold | 40 min |
| Sep 18, 4:49 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills | 41 min |
| Sep 19, 8:49 PM CDT | Severe Thunderstorm Warning | DMX | Palo Alto, Pocahontas | 25 min |
| Sep 19, 8:49 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 12 min |
| Sep 20, 3:32 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 43 min |
| Sep 20, 3:59 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 46 min |
| Sep 20, 4:56 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 34 min |
| Sep 20, 5:02 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, O'Brien, Osceola | 28 min |
| Sep 20, 5:13 PM CDT | Severe Thunderstorm Warning | DMX | Emmet | 47 min |
| Sep 20, 5:26 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona, Shelby | 49 min |
| Sep 20, 5:41 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Kossuth, Palo Alto | 34 min |
| Sep 20, 5:43 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Carroll, Crawford, Pocahontas, Sac | 47 min |
| Sep 20, 5:49 PM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Kossuth, Palo Alto, Pocahontas | 26 min |
| Sep 20, 5:50 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Ida | 25 min |
| Sep 20, 5:52 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Kossuth, Winnebago, Worth | 38 min |
| Sep 20, 6:25 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Hancock, Humboldt, Kossuth, Pocahontas, Webster and 1 more | 50 min |
| Sep 20, 6:28 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Kossuth, Winnebago, Worth | 47 min |
| Sep 20, 6:41 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Hamilton, Webster, Wright | 34 min |
| Sep 20, 7:14 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Pottawattamie, Shelby | 31 min |
| Sep 20, 8:13 PM CDT | Severe Thunderstorm Warning | ARX | Howard, Mitchell | 47 min |
| Sep 20, 8:24 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills | 36 min |
| Sep 20, 8:33 PM CDT | Severe Thunderstorm Warning | ARX | Howard | 42 min |
| Sep 20, 8:49 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills, Montgomery, Page | 26 min |
| Sep 25, 12:48 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Iowa, Johnson, Linn | 42 min |
| Sep 25, 1:17 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson, Keokuk, Washington | 43 min |
| Sep 25, 1:28 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Jackson, Johnson, Jones, Linn and 1 more | 62 min |
| Sep 25, 2:27 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Muscatine, Scott | 63 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Mills County8
- Fremont County8
- Montgomery County7
- Polk County7
- Dallas County6
- Kossuth County6
- Adair County5
- Pottawattamie County5
- Madison County5
- Jefferson County5
- Pocahontas County5
- Cass County4
- Story County4
- Keokuk County4
- Washington County4
- Palo Alto County4
- Hancock County4
- Jasper County3
- Mahaska County3
- Delaware County3
- Linn County3
- Union County3
- Henry County3
- Page County3
- Howard County3
- Humboldt County3
- Wright County3
- Cedar County3
- Johnson County3
- Scott County3
- Harrison County3
- Calhoun County3
- Audubon County2
- Buchanan County2
- Adams County2
- Warren County2
- Guthrie County2
- Boone County2
- Cerro Gordo County2
- Louisa County2
34 more counties
- Muscatine County2
- Des Moines County2
- Ringgold County2
- Buena Vista County2
- Clay County2
- Emmet County2
- Shelby County2
- Winnebago County2
- Worth County2
- Webster County2
- Clinton County2
- Marion County1
- Poweshiek County1
- Clarke County1
- Dubuque County1
- Taylor County1
- Decatur County1
- Lyon County1
- Plymouth County1
- Woodbury County1
- Dickinson County1
- O'Brien County1
- Osceola County1
- Monona County1
- Carroll County1
- Crawford County1
- Sac County1
- Ida County1
- Hamilton County1
- Mitchell County1
- Benton County1
- Iowa County1
- Jackson County1
- Jones County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20172019
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. Warning verification from the Mesonet's Cow. Rebuilt daily.