Alert archive / Iowa / Severe Thunderstorm Warnings / 2009
Severe Thunderstorm Warnings in Iowa, August 2009
77 severe thunderstorm warnings in August 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 August 2009. Tap one for its archive.
- Severe Thunderstorm Warnings
- 77
- Busiest day
- August 9, 200933 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 2, 9:16 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 44 min |
| Aug 2, 10:57 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 48 min |
| Aug 2, 11:12 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 33 min |
| Aug 2, 11:26 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, O'Brien, Plymouth, Sioux | 34 min |
| Aug 2, 11:32 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Plymouth, Woodbury | 28 min |
| Aug 2, 11:35 PM CDT | Severe Thunderstorm Warning | FSD | Clay, O'Brien, Osceola | 40 min |
| Aug 2, 11:49 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay, O'Brien | 56 min |
| Aug 2, 11:57 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 48 min |
| Aug 3, 12:02 AM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 28 min |
| Aug 3, 12:25 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Pocahontas, Sac | 50 min |
| Aug 3, 12:47 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Calhoun, Carroll, Greene, Hamilton, Humboldt and 4 more | 43 min |
| Aug 3, 1:03 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida, Plymouth, Woodbury | 42 min |
| Aug 3, 1:23 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Carroll, Dallas, Greene, Guthrie, Hamilton and 5 more | 35 min |
| Aug 3, 1:44 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida, Plymouth, Woodbury | 46 min |
| Aug 3, 2:25 AM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 50 min |
| Aug 3, 3:08 AM CDT | Severe Thunderstorm Warning | DMX | Carroll, Crawford, Sac | 52 min |
| Aug 3, 3:25 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Greene | 38 min |
| Aug 3, 4:29 AM CDT | Severe Thunderstorm Warning | DMX | Audubon, Carroll, Guthrie | 46 min |
| Aug 3, 4:53 AM CDT | Severe Thunderstorm Warning | DMX | Dallas, Guthrie, Madison | 52 min |
| Aug 4, 1:13 AM CDT | Severe Thunderstorm Warning | OAX | Fremont | 35 min |
| Aug 4, 1:45 AM CDT | Severe Thunderstorm Warning | OAX | Fremont, Page | 30 min |
| Aug 4, 5:13 AM CDT | Severe Thunderstorm Warning | OAX | Fremont | 32 min |
| Aug 4, 6:48 AM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Henry, Lee, Van Buren | 57 min |
| Aug 4, 7:26 AM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Henry | 64 min |
| Aug 8, 12:42 AM CDT | Severe Thunderstorm Warning | DMX | Grundy, Hamilton, Hardin, Marshall, Story | 48 min |
| Aug 8, 1:42 AM CDT | Severe Thunderstorm Warning | DMX | Tama | 19 min |
| Aug 9, 6:57 AM CDT | Severe Thunderstorm Warning | OAX | Monona | 48 min |
| Aug 9, 7:13 AM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 62 min |
| Aug 9, 7:32 AM CDT | Severe Thunderstorm Warning | DMX | Crawford, Sac | 43 min |
| Aug 9, 7:33 AM CDT | Severe Thunderstorm Warning | OAX | Harrison, Shelby | 57 min |
| Aug 9, 8:10 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Carroll, Crawford, Greene, Sac | 50 min |
| Aug 9, 8:50 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Webster | 55 min |
| Aug 9, 9:30 AM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Webster, Wright | 60 min |
| Aug 9, 9:45 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Hamilton, Story | 45 min |
| Aug 9, 10:07 AM CDT | Severe Thunderstorm Warning | DMX | Franklin, Grundy, Hamilton, Hardin, Marshall, Story | 53 min |
| Aug 9, 10:38 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Butler, Grundy, Marshall, Tama | 67 min |
| Aug 9, 11:31 AM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan, Linn | 59 min |
| Aug 9, 11:46 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 18 min |
| Aug 9, 12:13 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque, Jones, Linn | 77 min |
| Aug 9, 12:34 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque, Jackson | 86 min |
| Aug 9, 1:44 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan, Delaware, Jones, Linn | 61 min |
| Aug 9, 2:39 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque | 42 min |
| Aug 9, 4:00 PM CDT | Severe Thunderstorm Warning | DMX | Cass | 45 min |
| Aug 9, 4:24 PM CDT | Severe Thunderstorm Warning | DMX | Adair | 36 min |
| Aug 9, 4:28 PM CDT | Severe Thunderstorm Warning | OAX | Fremont | 50 min |
| Aug 9, 5:06 PM CDT | Severe Thunderstorm Warning | DMX | Dallas | 39 min |
| Aug 9, 5:12 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Page | 39 min |
| Aug 9, 5:18 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Clarke, Madison, Union, Warren | 57 min |
| Aug 9, 5:26 PM CDT | Severe Thunderstorm Warning | DMX | Polk | 49 min |
| Aug 9, 5:49 PM CDT | Severe Thunderstorm Warning | DMX | Marion, Warren | 41 min |
| Aug 9, 5:52 PM CDT | Severe Thunderstorm Warning | DMX | Adams, Taylor | 38 min |
| Aug 9, 5:53 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Polk | 52 min |
| Aug 9, 6:15 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Lucas, Warren | 45 min |
| Aug 9, 6:17 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Ringgold, Union | 43 min |
| Aug 9, 6:25 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Marion, Poweshiek | 50 min |
| Aug 9, 6:28 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold, Taylor | 47 min |
| Aug 9, 6:33 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Poweshiek, Tama | 57 min |
| Aug 9, 6:47 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Iowa, Keokuk | 58 min |
| Aug 9, 6:54 PM CDT | Severe Thunderstorm Warning | DMX | Marshall, Tama | 51 min |
| Aug 9, 7:00 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Ringgold, Union | 45 min |
| Aug 9, 7:34 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Iowa, Johnson, Keokuk, Linn, Louisa and 1 more | 56 min |
| Aug 9, 7:47 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Iowa | 58 min |
| Aug 9, 8:07 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Johnson, Jones, Linn, Muscatine | 68 min |
| Aug 9, 8:53 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines | 52 min |
| Aug 13, 11:47 AM CDT | Severe Thunderstorm Warning | DMX | Kossuth, Winnebago | 40 min |
| Aug 13, 12:45 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Kossuth, Winnebago | 30 min |
| Aug 19, 1:27 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Henry, Lee, Louisa | 63 min |
| Aug 19, 4:30 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 30 min |
| Aug 19, 4:57 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 33 min |
| Aug 19, 5:04 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Page | 56 min |
| Aug 19, 5:31 PM CDT | Severe Thunderstorm Warning | FSD | Sioux | 29 min |
| Aug 19, 5:48 PM CDT | Severe Thunderstorm Warning | DMX | Adams, Taylor | 42 min |
| Aug 19, 5:49 PM CDT | Severe Thunderstorm Warning | OAX | Page | 26 min |
| Aug 19, 7:28 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 47 min |
| Aug 19, 7:44 PM CDT | Severe Thunderstorm Warning | DMX | Sac | 46 min |
| Aug 19, 8:34 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Sac | 22 min |
| Aug 24, 11:36 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 39 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Woodbury County8
- Sac County7
- Sioux County6
- Plymouth County6
- Hamilton County6
- Fremont County6
- Marshall County6
- Cherokee County5
- Calhoun County5
- Carroll County5
- Ida County5
- Benton County5
- Linn County5
- Lyon County4
- Boone County4
- Greene County4
- Webster County4
- Dallas County4
- Story County4
- Page County4
- Des Moines County4
- Tama County4
- Clarke County4
- O'Brien County3
- Clay County3
- Wright County3
- Guthrie County3
- Hardin County3
- Polk County3
- Crawford County3
- Henry County3
- Grundy County3
- Dubuque County3
- Jones County3
- Union County3
- Warren County3
- Taylor County3
- Ringgold County3
- Iowa County3
- Pocahontas County2
34 more counties
- Madison County2
- Lee County2
- Black Hawk County2
- Buchanan County2
- Delaware County2
- Adair County2
- Marion County2
- Adams County2
- Jasper County2
- Decatur County2
- Poweshiek County2
- Keokuk County2
- Johnson County2
- Louisa County2
- Kossuth County2
- Winnebago County2
- Osceola County1
- Buena Vista County1
- Humboldt County1
- Audubon County1
- Van Buren County1
- Monona County1
- Harrison County1
- Shelby County1
- Franklin County1
- Butler County1
- Jackson County1
- Cass County1
- Lucas County1
- Mahaska County1
- Washington County1
- Cedar County1
- Muscatine County1
- Hancock 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.