Alert archive / Iowa / Severe Thunderstorm Warnings / 2009
Severe Thunderstorm Warnings in Iowa, July 2009
101 severe thunderstorm warnings in July 2009. 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 July 2009. Tap one for its archive.
- Severe Thunderstorm Warnings
- 101
- Busiest day
- July 10, 200924 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 |
|---|---|---|---|---|
| Jul 7, 7:51 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 39 min |
| Jul 7, 8:02 PM CDT | Severe Thunderstorm Warning | FSD | Sioux | 43 min |
| Jul 7, 8:23 PM CDT | Severe Thunderstorm Warning | FSD | Clay, O'Brien | 52 min |
| Jul 7, 8:39 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 51 min |
| Jul 7, 8:44 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 46 min |
| Jul 7, 8:58 PM CDT | Severe Thunderstorm Warning | FSD | Sioux | 32 min |
| Jul 7, 8:59 PM CDT | Severe Thunderstorm Warning | DMX | Kossuth, Palo Alto | 46 min |
| Jul 7, 9:53 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 37 min |
| Jul 7, 10:22 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 38 min |
| Jul 7, 11:29 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 46 min |
| Jul 8, 12:36 AM CDT | Severe Thunderstorm Warning | OAX | Harrison, Mills, Pottawattamie | 39 min |
| Jul 8, 1:13 AM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills, Pottawattamie | 47 min |
| Jul 8, 1:49 AM CDT | Severe Thunderstorm Warning | OAX | Fremont | 41 min |
| Jul 9, 8:29 AM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 61 min |
| Jul 9, 8:47 AM CDT | Severe Thunderstorm Warning | OAX | Monona | 58 min |
| Jul 9, 9:41 AM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona | 49 min |
| Jul 9, 11:14 AM CDT | Severe Thunderstorm Warning | FSD | Sioux | 31 min |
| Jul 9, 2:02 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 28 min |
| Jul 9, 2:29 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Osceola, Sioux | 31 min |
| Jul 9, 2:48 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 27 min |
| Jul 9, 3:14 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, O'Brien, Osceola, Sioux | 17 min |
| Jul 9, 3:15 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 30 min |
| Jul 9, 3:38 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, O'Brien | 21 min |
| Jul 9, 3:46 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 12 min |
| Jul 9, 6:15 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 30 min |
| Jul 9, 6:30 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 30 min |
| Jul 9, 6:48 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 42 min |
| Jul 9, 7:19 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, O'Brien, Osceola, Sioux | 41 min |
| Jul 9, 7:44 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Osceola | 46 min |
| Jul 9, 7:52 PM CDT | Severe Thunderstorm Warning | FSD | O'Brien, Osceola | 38 min |
| Jul 9, 8:24 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, O'Brien, Osceola | 51 min |
| Jul 9, 8:57 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Palo Alto | 48 min |
| Jul 9, 9:15 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson | 45 min |
| Jul 9, 9:42 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Palo Alto | 48 min |
| Jul 9, 10:51 PM CDT | Severe Thunderstorm Warning | DMX | Kossuth | 39 min |
| Jul 10, 1:30 AM CDT | Severe Thunderstorm Warning | ARX | Floyd, Mitchell | 32 min |
| Jul 10, 2:54 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler | 36 min |
| Jul 10, 3:06 AM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 54 min |
| Jul 10, 3:27 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler, Grundy | 48 min |
| Jul 10, 4:05 AM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan, Delaware, Linn | 55 min |
| Jul 10, 4:58 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Grundy, Marshall, Tama | 47 min |
| Jul 10, 5:00 AM CDT | Severe Thunderstorm Warning | DVN | Cedar, Delaware, Dubuque, Jackson, Jones, Linn | 60 min |
| Jul 10, 5:10 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 35 min |
| Jul 10, 6:36 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee | 25 min |
| Jul 10, 8:02 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Hamilton, Webster | 43 min |
| Jul 10, 8:10 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Carroll, Crawford, Greene, Sac | 50 min |
| Jul 10, 8:29 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Greene, Hamilton, Story | 46 min |
| Jul 10, 8:45 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Greene, Guthrie | 29 min |
| Jul 10, 8:51 AM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware, Jones, Linn | 54 min |
| Jul 10, 9:10 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Polk, Story | 50 min |
| Jul 10, 9:36 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall | 39 min |
| Jul 10, 10:52 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Iowa, Johnson, Linn | 53 min |
| Jul 12, 10:36 AM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie, Shelby | 39 min |
| Jul 12, 11:30 AM CDT | Severe Thunderstorm Warning | OAX | Harrison | 45 min |
| Jul 12, 11:52 AM CDT | Severe Thunderstorm Warning | DMX | Adams, Taylor | 38 min |
| Jul 14, 7:42 PM CDT | Severe Thunderstorm Warning | FSD | Dickinson | 33 min |
| Jul 14, 7:51 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Palo Alto | 54 min |
| Jul 14, 8:00 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee | 45 min |
| Jul 14, 8:19 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson | 26 min |
| Jul 14, 8:27 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Ida | 33 min |
| Jul 14, 8:48 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Kossuth, Winnebago | 42 min |
| Jul 14, 9:20 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Winnebago, Worth | 55 min |
| Jul 14, 10:48 PM CDT | Severe Thunderstorm Warning | DMX | Carroll, Greene, Guthrie | 46 min |
| Jul 14, 11:23 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Polk | 52 min |
| Jul 14, 11:38 PM CDT | Severe Thunderstorm Warning | DMX | Bremer | 22 min |
| Jul 14, 11:41 PM CDT | Severe Thunderstorm Warning | ARX | Fayette | 49 min |
| Jul 15, 12:00 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Polk, Story | 46 min |
| Jul 15, 12:22 AM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Marion, Monroe | 38 min |
| Jul 15, 12:29 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marion, Polk, Warren | 46 min |
| Jul 15, 1:02 AM CDT | Severe Thunderstorm Warning | DMX | Davis, Wapello | 43 min |
| Jul 15, 2:03 AM CDT | Severe Thunderstorm Warning | DMX | Davis | 42 min |
| Jul 21, 6:03 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Pocahontas, Webster | 42 min |
| Jul 22, 5:55 PM CDT | Severe Thunderstorm Warning | DMX | Pocahontas | 50 min |
| Jul 22, 6:31 PM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Pocahontas, Webster | 44 min |
| Jul 22, 6:49 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 29 min |
| Jul 23, 5:56 AM CDT | Severe Thunderstorm Warning | DMX | Appanoose | 49 min |
| Jul 24, 12:11 PM CDT | Severe Thunderstorm Warning | ARX | Howard, Winneshiek | 64 min |
| Jul 24, 12:40 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Chickasaw, Clayton, Fayette, Howard, Winneshiek | 65 min |
| Jul 24, 1:32 PM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 58 min |
| Jul 24, 1:48 PM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 27 min |
| Jul 24, 1:55 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware, Dubuque | 65 min |
| Jul 24, 2:47 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque, Jones | 40 min |
| Jul 24, 3:07 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 53 min |
| Jul 24, 3:42 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 63 min |
| Jul 24, 4:24 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 66 min |
| Jul 24, 5:10 PM CDT | Severe Thunderstorm Warning | ARX | Fayette, Winneshiek | 65 min |
| Jul 24, 5:36 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton, Fayette | 69 min |
| Jul 24, 6:19 PM CDT | Severe Thunderstorm Warning | DMX | Bremer | 41 min |
| Jul 24, 6:20 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque, Jackson | 70 min |
| Jul 24, 6:22 PM CDT | Severe Thunderstorm Warning | ARX | Fayette | 53 min |
| Jul 24, 6:27 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware, Dubuque | 63 min |
| Jul 24, 6:44 PM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 54 min |
| Jul 24, 6:53 PM CDT | Severe Thunderstorm Warning | DVN | Jackson | 82 min |
| Jul 24, 7:30 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware, Dubuque, Jackson, Jones, Linn | 60 min |
| Jul 24, 7:41 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson | 64 min |
| Jul 24, 7:48 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Cedar, Clinton, Jones, Linn | 62 min |
| Jul 24, 8:43 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Cedar, Iowa, Johnson, Jones, Linn and 1 more | 62 min |
| Jul 24, 8:46 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Scott | 89 min |
| Jul 24, 9:18 PM CDT | Severe Thunderstorm Warning | DVN | Keokuk, Louisa, Washington | 57 min |
| Jul 24, 9:54 PM CDT | Severe Thunderstorm Warning | DVN | Johnson, Muscatine | 43 min |
| Jul 29, 4:12 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida, Woodbury | 24 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Sioux County12
- Fayette County9
- Clay County8
- Lyon County7
- Plymouth County7
- Delaware County7
- Linn County7
- O'Brien County6
- Osceola County6
- Clayton County6
- Dubuque County6
- Jones County6
- Buena Vista County5
- Woodbury County5
- Dickinson County5
- Buchanan County5
- Jackson County5
- Allamakee County5
- Palo Alto County4
- Harrison County4
- Bremer County4
- Benton County4
- Cherokee County4
- Greene County4
- Jasper County4
- Polk County4
- Kossuth County3
- Monona County3
- Pottawattamie County3
- Emmet County3
- Black Hawk County3
- Marshall County3
- Cedar County3
- Calhoun County3
- Webster County3
- Boone County3
- Story County3
- Johnson County3
- Pocahontas County3
- Winneshiek County3
38 more counties
- Clinton County3
- Mills County2
- Fremont County2
- Butler County2
- Grundy County2
- Hamilton County2
- Carroll County2
- Dallas County2
- Guthrie County2
- Iowa County2
- Ida County2
- Hancock County2
- Winnebago County2
- Marion County2
- Davis County2
- Howard County2
- Muscatine County2
- Floyd County1
- Mitchell County1
- Tama County1
- Crawford County1
- Sac County1
- Shelby County1
- Adams County1
- Taylor County1
- Cerro Gordo County1
- Worth County1
- Mahaska County1
- Monroe County1
- Warren County1
- Wapello County1
- Humboldt County1
- Appanoose County1
- Chickasaw County1
- Scott County1
- Keokuk County1
- Louisa County1
- Washington County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20082010
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.