Alert archive / Iowa / Severe Thunderstorm Warnings / 2018
Severe Thunderstorm Warnings in Iowa, May 2018
123 severe thunderstorm warnings in May 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 May 2018. Tap one for its archive.
- Severe Thunderstorm Warnings
- 123
- Busiest day
- May 29, 201822 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 |
|---|---|---|---|---|
| May 1, 4:00 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Ida, Woodbury | 45 min |
| May 1, 4:35 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Story | 40 min |
| May 1, 4:37 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay | 38 min |
| May 1, 5:08 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 52 min |
| May 1, 5:09 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Story | 51 min |
| May 1, 5:11 PM CDT | Severe Thunderstorm Warning | DMX | Kossuth, Winnebago | 32 min |
| May 1, 5:24 PM CDT | Severe Thunderstorm Warning | DMX | Butler, Cerro Gordo, Franklin, Wright | 33 min |
| May 1, 5:29 PM CDT | Severe Thunderstorm Warning | DMX | Palo Alto, Pocahontas | 46 min |
| May 1, 5:31 PM CDT | Severe Thunderstorm Warning | DMX | Winnebago, Worth | 44 min |
| May 1, 5:54 PM CDT | Severe Thunderstorm Warning | DMX | Marshall, Story | 36 min |
| May 1, 6:05 PM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Kossuth, Palo Alto, Pocahontas | 40 min |
| May 1, 6:08 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona | 52 min |
| May 1, 6:24 PM CDT | Severe Thunderstorm Warning | DMX | Marshall, Tama | 36 min |
| May 1, 6:40 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Humboldt, Kossuth, Wright | 50 min |
| May 1, 7:15 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, O'Brien, Osceola, Sioux | 45 min |
| May 1, 7:25 PM CDT | Severe Thunderstorm Warning | FSD | Dickinson, O'Brien, Osceola | 35 min |
| May 1, 7:47 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Cass, Guthrie | 43 min |
| May 1, 8:17 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Greene, Guthrie | 43 min |
| May 1, 8:25 PM CDT | Severe Thunderstorm Warning | DVN | Delaware | 35 min |
| May 2, 2:53 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Humboldt, Pocahontas, Webster | 41 min |
| May 2, 4:39 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson | 38 min |
| May 2, 5:04 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson | 56 min |
| May 2, 5:10 PM CDT | Severe Thunderstorm Warning | OAX | Page | 35 min |
| May 2, 5:32 PM CDT | Severe Thunderstorm Warning | DMX | Adams, Taylor | 43 min |
| May 2, 5:44 PM CDT | Severe Thunderstorm Warning | OAX | Page | 16 min |
| May 2, 5:58 PM CDT | Severe Thunderstorm Warning | OAX | Page | 17 min |
| May 2, 6:15 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold, Taylor, Union | 45 min |
| May 2, 6:20 PM CDT | Severe Thunderstorm Warning | DVN | Jackson | 15 min |
| May 2, 6:24 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Union | 51 min |
| May 2, 6:34 PM CDT | Severe Thunderstorm Warning | DVN | Keokuk | 56 min |
| May 2, 7:18 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Johnson, Washington | 57 min |
| May 2, 7:51 PM CDT | Severe Thunderstorm Warning | DVN | Scott | 39 min |
| May 2, 7:58 PM CDT | Severe Thunderstorm Warning | DVN | Keokuk, Washington | 29 min |
| May 2, 8:05 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold, Taylor | 40 min |
| May 2, 8:07 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Johnson, Muscatine | 53 min |
| May 2, 8:19 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque | 36 min |
| May 2, 8:34 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Scott | 27 min |
| May 2, 8:43 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Ringgold, Taylor, Union | 47 min |
| May 2, 11:33 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Davis, Monroe, Wapello | 29 min |
| May 3, 5:39 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Polk, Warren | 25 min |
| May 3, 6:25 PM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Webster, Wright | 50 min |
| May 3, 7:50 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Story | 55 min |
| May 3, 8:23 PM CDT | Severe Thunderstorm Warning | DMX | Grundy, Hardin, Marshall, Tama | 52 min |
| May 3, 8:48 PM CDT | Severe Thunderstorm Warning | DMX | Poweshiek, Tama | 42 min |
| May 4, 6:39 AM CDT | Severe Thunderstorm Warning | DVN | Lee | 19 min |
| May 8, 8:14 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson | 46 min |
| May 8, 8:58 PM CDT | Severe Thunderstorm Warning | FSD | Dickinson | 32 min |
| May 12, 1:44 AM CDT | Severe Thunderstorm Warning | OAX | Harrison, Pottawattamie, Shelby | 31 min |
| May 12, 1:58 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Dallas, Guthrie, Madison | 47 min |
| May 12, 3:39 AM CDT | Severe Thunderstorm Warning | DMX | Lucas, Marion, Warren | 33 min |
| May 12, 3:50 AM CDT | Severe Thunderstorm Warning | DVN | Keokuk, Louisa, Washington | 40 min |
| May 13, 2:17 PM CDT | Severe Thunderstorm Warning | DVN | Keokuk, Washington | 43 min |
| May 14, 2:27 AM CDT | Severe Thunderstorm Warning | DMX | Carroll, Crawford | 48 min |
| May 14, 3:07 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Carroll, Sac | 32 min |
| May 14, 7:21 AM CDT | Severe Thunderstorm Warning | DVN | Jones | 24 min |
| May 14, 7:43 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 32 min |
| May 14, 8:29 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Louisa, Washington | 46 min |
| May 14, 8:49 PM CDT | Severe Thunderstorm Warning | DMX | Lucas, Wayne | 26 min |
| May 14, 9:12 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Henry | 39 min |
| May 14, 9:13 PM CDT | Severe Thunderstorm Warning | DMX | Lucas, Wayne | 47 min |
| May 25, 3:35 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 25 min |
| May 25, 4:11 PM CDT | Severe Thunderstorm Warning | DMX | Winnebago, Worth | 49 min |
| May 25, 4:58 PM CDT | Severe Thunderstorm Warning | DMX | Franklin, Wright | 47 min |
| May 25, 5:28 PM CDT | Severe Thunderstorm Warning | DMX | Butler, Franklin, Grundy, Hardin | 62 min |
| May 25, 5:38 PM CDT | Severe Thunderstorm Warning | ARX | Floyd, Mitchell | 19 min |
| May 25, 5:48 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Story | 42 min |
| May 25, 6:06 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 24 min |
| May 25, 6:25 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Story | 50 min |
| May 25, 6:31 PM CDT | Severe Thunderstorm Warning | DMX | Grundy, Hardin | 44 min |
| May 25, 6:43 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 47 min |
| May 25, 6:48 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 27 min |
| May 25, 6:55 PM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 50 min |
| May 25, 6:57 PM CDT | Severe Thunderstorm Warning | DMX | Polk | 48 min |
| May 25, 7:05 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 40 min |
| May 25, 7:06 PM CDT | Severe Thunderstorm Warning | DMX | Grundy, Marshall, Tama | 54 min |
| May 25, 7:12 PM CDT | Severe Thunderstorm Warning | DMX | Hardin, Marshall | 29 min |
| May 25, 7:23 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware, Dubuque | 52 min |
| May 25, 7:39 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Polk | 28 min |
| May 25, 7:40 PM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 65 min |
| May 25, 7:46 PM CDT | Severe Thunderstorm Warning | DMX | Marshall, Tama | 25 min |
| May 25, 8:10 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware, Dubuque, Jackson | 50 min |
| May 25, 8:22 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Worth | 19 min |
| May 25, 8:25 PM CDT | Severe Thunderstorm Warning | DMX | Poweshiek, Tama | 19 min |
| May 25, 10:26 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware | 34 min |
| May 26, 12:35 AM CDT | Severe Thunderstorm Warning | DVN | Iowa | 40 min |
| May 26, 12:51 AM CDT | Severe Thunderstorm Warning | DVN | Benton | 24 min |
| May 26, 1:07 AM CDT | Severe Thunderstorm Warning | DVN | Iowa, Johnson, Linn | 38 min |
| May 26, 3:53 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 37 min |
| May 26, 5:19 PM CDT | Severe Thunderstorm Warning | DVN | Lee | 27 min |
| May 27, 2:49 PM CDT | Severe Thunderstorm Warning | DVN | Scott | 16 min |
| May 27, 3:11 PM CDT | Severe Thunderstorm Warning | DVN | Cedar | 49 min |
| May 27, 4:20 PM CDT | Severe Thunderstorm Warning | DVN | Scott | 18 min |
| May 28, 2:50 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Polk, Story | 40 min |
| May 28, 3:20 PM CDT | Severe Thunderstorm Warning | DMX | Jasper | 25 min |
| May 28, 3:32 PM CDT | Severe Thunderstorm Warning | DMX | Marshall | 28 min |
| May 28, 3:42 PM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Webster, Wright | 48 min |
| May 28, 4:35 PM CDT | Severe Thunderstorm Warning | DMX | Wright | 40 min |
| May 28, 4:48 PM CDT | Severe Thunderstorm Warning | DMX | Polk, Warren | 27 min |
| May 28, 5:03 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Franklin, Hancock, Wright | 57 min |
| May 28, 5:41 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Winnebago, Worth | 64 min |
| May 29, 2:34 PM CDT | Severe Thunderstorm Warning | OAX | Montgomery, Pottawattamie | 26 min |
| May 29, 2:50 PM CDT | Severe Thunderstorm Warning | OAX | Shelby | 14 min |
| May 29, 3:24 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Pottawattamie, Shelby | 21 min |
| May 29, 3:27 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Shelby | 18 min |
| May 29, 3:30 PM CDT | Severe Thunderstorm Warning | DMX | Polk, Story | 18 min |
| May 29, 3:36 PM CDT | Severe Thunderstorm Warning | DMX | Story | 24 min |
| May 29, 3:45 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Shelby | 30 min |
| May 29, 3:49 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 41 min |
| May 29, 3:54 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Pottawattamie | 36 min |
| May 29, 3:59 PM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Story | 16 min |
| May 29, 4:18 PM CDT | Severe Thunderstorm Warning | OAX | Fremont | 42 min |
| May 29, 4:20 PM CDT | Severe Thunderstorm Warning | OAX | Montgomery, Page, Pottawattamie | 40 min |
| May 29, 4:28 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 32 min |
| May 29, 4:58 PM CDT | Severe Thunderstorm Warning | OAX | Montgomery, Pottawattamie | 47 min |
| May 29, 5:15 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Cass | 45 min |
| May 29, 5:26 PM CDT | Severe Thunderstorm Warning | DMX | Polk, Warren | 34 min |
| May 29, 5:37 PM CDT | Severe Thunderstorm Warning | DMX | Polk | 23 min |
| May 29, 6:00 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Guthrie, Madison | 30 min |
| May 29, 6:12 PM CDT | Severe Thunderstorm Warning | DMX | Dallas | 33 min |
| May 29, 6:14 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Palo Alto | 46 min |
| May 29, 6:24 PM CDT | Severe Thunderstorm Warning | DMX | Worth | 21 min |
| May 29, 6:50 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Story | 15 min |
| May 29, 10:38 PM CDT | Severe Thunderstorm Warning | DVN | Scott | 52 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Story County11
- Marshall County8
- Harrison County8
- Polk County8
- Wright County7
- Boone County6
- Tama County6
- Pottawattamie County6
- Dallas County5
- Worth County5
- Delaware County5
- Washington County5
- Scott County5
- Jasper County5
- Shelby County5
- Winnebago County4
- Cerro Gordo County4
- Franklin County4
- Guthrie County4
- Jackson County4
- Page County4
- Taylor County4
- Keokuk County4
- Warren County4
- Grundy County4
- Hardin County4
- Buena Vista County3
- Clay County3
- Kossuth County3
- Palo Alto County3
- Pocahontas County3
- Humboldt County3
- Hancock County3
- Dickinson County3
- Webster County3
- Clinton County3
- Ringgold County3
- Union County3
- Iowa County3
- Johnson County3
50 more counties
- Cedar County3
- Dubuque County3
- Hamilton County3
- Lucas County3
- Wayne County3
- Allamakee County3
- Clayton County3
- Buchanan County3
- Montgomery County3
- Cherokee County2
- Butler County2
- O'Brien County2
- Osceola County2
- Audubon County2
- Cass County2
- Calhoun County2
- Clarke County2
- Decatur County2
- Poweshiek County2
- Lee County2
- Madison County2
- Louisa County2
- Carroll County2
- Crawford County2
- Henry County2
- Fayette County2
- Ida County1
- Woodbury County1
- Monona County1
- Lyon County1
- Sioux County1
- Greene County1
- Adams County1
- Muscatine County1
- Appanoose County1
- Davis County1
- Monroe County1
- Wapello County1
- Adair County1
- Marion County1
- Sac County1
- Jones County1
- Des Moines County1
- Floyd County1
- Mitchell County1
- Benton County1
- Linn County1
- Mahaska County1
- Fremont County1
- Emmet 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.