Alert archive / Iowa / 2011
Weather alerts in Iowa, April 2011
160 weather alerts in April 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
Weather alerts by county
Each county as a circle sized by its count in April 2011. Tap one for its archive.
- Alerts
- 160
- Warnings
- 115
- Watches
- 7
- Advisories
- 21
- Busiest day
- April 10, 201181 alerts
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 |
|---|---|---|---|---|
| Apr 1, 5:35 PM CDT | Special Weather Statement | DVN | Scott | 55 min |
| Apr 3, 4:17 AM CDT | Wind Advisory | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 36 hr |
| Apr 3, 11:08 AM CDT | Wind Advisory | OAX | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 28 hr |
| Apr 3, 3:47 PM CDT | Wind Advisory | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more | 26 hr |
| Apr 3, 4:49 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Black Hawk, Buchanan, Cedar, Clarke and 31 more | 56 min |
| Apr 3, 5:57 PM CDT | Tornado Watch | SPC | Appanoose, Cedar, Clinton, Davis, Delaware, Des Moines and 20 more | 6 hr |
| Apr 3, 6:00 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 45 min |
| Apr 3, 6:06 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Iowa, Johnson, Linn | 39 min |
| Apr 3, 6:14 PM CDT | Severe Thunderstorm Warning | DMX | Poweshiek | 31 min |
| Apr 3, 6:30 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Jefferson, Johnson, Keokuk, Linn, Louisa and 2 more | 45 min |
| Apr 3, 6:36 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Monroe, Wapello | 24 min |
| Apr 3, 6:51 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque, Jackson, Jones, Linn | 39 min |
| Apr 3, 6:59 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Jackson, Jones | 46 min |
| Apr 3, 7:13 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Johnson, Keokuk, Washington | 51 min |
| Apr 3, 7:24 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque | 21 min |
| Apr 3, 7:44 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Cedar, Clinton, Davis, Delaware and 21 more | 61 min |
| Apr 3, 7:59 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Henry, Jefferson, Johnson, Louisa, Muscatine and 1 more | 34 min |
| Apr 3, 8:07 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque, Jackson, Jones | 29 min |
| Apr 3, 8:28 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Louisa, Muscatine, Scott | 46 min |
| Apr 3, 8:33 PM CDT | Severe Thunderstorm Warning | OAX | Page | 15 min |
| Apr 3, 8:36 PM CDT | Severe Thunderstorm Warning | DMX | Taylor | 24 min |
| Apr 3, 8:51 PM CDT | Severe Thunderstorm Warning | DMX | Adams, Union | 24 min |
| Apr 3, 8:51 PM CDT | Severe Thunderstorm Warning | DVN | Scott | 54 min |
| Apr 3, 9:36 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Lee | 38 min |
| Apr 3, 10:23 PM CDT | Mesoscale Discussion | SPC | Clinton, Jackson, Louisa, Muscatine, Scott | 67 min |
| Apr 4, 2:01 AM CDT | Wind Advisory | ARX | Chickasaw, Clayton, Fayette, Floyd, Howard, Mitchell and 1 more | 16 hr |
| Apr 4, 11:58 AM CDT | Wind Advisory | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more | 6 hr |
| Apr 7, 11:55 AM CDT | River Flood Warning | DVN | Jackson | 21 days |
| Apr 9, 3:59 AM CDT | Special Weather Statement | DVN | Clinton, Scott | 61 min |
| Apr 9, 4:27 AM CDT | Special Weather Statement | DVN | Clinton | 63 min |
| Apr 9, 5:00 PM CDT | Mesoscale Discussion | SPC | Audubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 17 more | 60 min |
| Apr 9, 5:48 PM CDT | Tornado Watch | SPC | Audubon, Boone, Buena Vista, Calhoun, Carroll, Cass and 36 more | 7 hr |
| Apr 9, 6:09 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 36 min |
| Apr 9, 6:16 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 14 min |
| Apr 9, 6:33 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 27 min |
| Apr 9, 6:39 PM CDT | Tornado Warning | OAX | Monona | 35 min |
| Apr 9, 6:41 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 34 min |
| Apr 9, 6:55 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 17 min |
| Apr 9, 7:08 PM CDT | Tornado Warning | OAX | Monona | 33 min |
| Apr 9, 7:09 PM CDT | Tornado Warning | DMX | Crawford | 51 min |
| Apr 9, 7:09 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 36 min |
| Apr 9, 7:31 PM CDT | Tornado Warning | FSD | Ida | 29 min |
| Apr 9, 7:42 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Chickasaw, Floyd, Howard, Mitchell, Winneshiek | 7 hr |
| Apr 9, 7:44 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 31 min |
| Apr 9, 7:46 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida, Woodbury | 29 min |
| Apr 9, 7:56 PM CDT | Tornado Warning | FSD | Ida | 34 min |
| Apr 9, 7:58 PM CDT | Tornado Warning | DMX | Sac | 47 min |
| Apr 9, 8:08 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Ida, Woodbury | 37 min |
| Apr 9, 8:11 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 34 min |
| Apr 9, 8:19 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 41 min |
| Apr 9, 8:23 PM CDT | Tornado Warning | DMX | Sac | 22 min |
| Apr 9, 8:40 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 35 min |
| Apr 9, 8:41 PM CDT | Tornado Warning | DMX | Sac | 34 min |
| Apr 9, 8:41 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 19 min |
| Apr 9, 8:49 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 41 min |
| Apr 9, 8:55 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 35 min |
| Apr 9, 8:57 PM CDT | Severe Thunderstorm Warning | DMX | Kossuth, Palo Alto | 33 min |
| Apr 9, 9:06 PM CDT | Mesoscale Discussion | SPC | Audubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 31 more | 54 min |
| Apr 9, 9:08 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 37 min |
| Apr 9, 9:09 PM CDT | Tornado Warning | FSD | Buena Vista | 36 min |
| Apr 9, 9:11 PM CDT | Tornado Warning | DMX | Calhoun, Pocahontas, Sac | 49 min |
| Apr 9, 9:15 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 30 min |
| Apr 9, 9:17 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 43 min |
| Apr 9, 9:19 PM CDT | Severe Thunderstorm Warning | DMX | Sac | 26 min |
| Apr 9, 9:24 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Plymouth, Woodbury | 36 min |
| Apr 9, 9:25 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 20 min |
| Apr 9, 9:31 PM CDT | Tornado Warning | FSD | Plymouth, Woodbury | 29 min |
| Apr 9, 9:36 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay | 39 min |
| Apr 9, 9:46 PM CDT | Tornado Warning | FSD | Buena Vista | 29 min |
| Apr 9, 9:48 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Kossuth, Winnebago | 42 min |
| Apr 9, 9:48 PM CDT | Tornado Warning | FSD | Cherokee | 27 min |
| Apr 9, 9:55 PM CDT | Tornado Warning | DMX | Palo Alto, Pocahontas | 35 min |
| Apr 9, 9:58 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 32 min |
| Apr 9, 10:02 PM CDT | Tornado Warning | FSD | Buena Vista | 28 min |
| Apr 9, 10:09 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 36 min |
| Apr 9, 10:12 PM CDT | Tornado Warning | DMX | Hancock, Kossuth | 33 min |
| Apr 9, 10:13 PM CDT | Tornado Warning | FSD | Buena Vista, Cherokee | 47 min |
| Apr 9, 10:18 PM CDT | Tornado Warning | DMX | Cerro Gordo, Hancock, Winnebago, Worth | 42 min |
| Apr 9, 10:22 PM CDT | Tornado Warning | DMX | Pocahontas | 38 min |
| Apr 9, 10:24 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, O'Brien, Plymouth, Sioux | 36 min |
| Apr 9, 10:28 PM CDT | Tornado Warning | DMX | Humboldt, Kossuth, Palo Alto, Pocahontas | 47 min |
| Apr 9, 10:31 PM CDT | Tornado Warning | FSD | Cherokee | 29 min |
| Apr 9, 10:35 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 30 min |
| Apr 9, 10:43 PM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Buena Vista, Butler, Cerro Gordo and 25 more | 62 min |
| Apr 9, 10:50 PM CDT | Tornado Warning | FSD | Buena Vista, Cherokee | 40 min |
| Apr 9, 10:53 PM CDT | Tornado Warning | ARX | Chickasaw, Floyd, Howard, Mitchell | 37 min |
| Apr 9, 10:54 PM CDT | Tornado Warning | DMX | Humboldt, Kossuth, Palo Alto, Pocahontas | 51 min |
| Apr 9, 10:58 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Worth | 25 min |
| Apr 9, 11:01 PM CDT | Tornado Watch | SPC | Allamakee, Bremer, Buena Vista, Butler, Cerro Gordo, Cherokee and 19 more | 5 hr |
| Apr 9, 11:08 PM CDT | Severe Thunderstorm Warning | ARX | Mitchell | 52 min |
| Apr 9, 11:11 PM CDT | Tornado Warning | DMX | Kossuth, Palo Alto | 12 min |
| Apr 9, 11:11 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 34 min |
| Apr 9, 11:15 PM CDT | Severe Thunderstorm Warning | ARX | Howard, Winneshiek | 45 min |
| Apr 9, 11:24 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Kossuth, Palo Alto | 36 min |
| Apr 9, 11:27 PM CDT | Tornado Warning | FSD | Buena Vista, Clay | 18 min |
| Apr 9, 11:29 PM CDT | Tornado Warning | DMX | Hancock, Kossuth, Winnebago | 33 min |
| Apr 9, 11:36 PM CDT | Tornado Warning | DMX | Emmet, Palo Alto | 39 min |
| Apr 9, 11:39 PM CDT | Tornado Warning | FSD | Clay | 21 min |
| Apr 9, 11:41 PM CDT | Severe Thunderstorm Warning | DMX | Kossuth, Winnebago | 49 min |
| Apr 9, 11:55 PM CDT | Tornado Warning | DMX | Kossuth, Palo Alto | 35 min |
| Apr 9, 11:58 PM CDT | Severe Thunderstorm Warning | DMX | Winnebago, Worth | 32 min |
| Apr 10, 12:15 AM CDT | Severe Thunderstorm Warning | OAX | Monona | 33 min |
| Apr 10, 12:24 AM CDT | Severe Thunderstorm Warning | DMX | Hancock, Kossuth, Winnebago, Worth | 31 min |
| Apr 10, 12:24 AM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 36 min |
| Apr 10, 12:47 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida | 28 min |
| Apr 10, 12:53 AM CDT | Severe Thunderstorm Warning | DMX | Worth | 22 min |
| Apr 10, 1:07 AM CDT | Severe Thunderstorm Warning | DMX | Sac | 38 min |
| Apr 10, 1:26 AM CDT | Mesoscale Discussion | SPC | Allamakee, Buena Vista, Cerro Gordo, Chickasaw, Clay, Dickinson and 14 more | 64 min |
| Apr 10, 1:38 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Humboldt, Pocahontas, Webster | 52 min |
| Apr 10, 3:52 AM CDT | Wind Advisory | OAX | Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more | 11 hr |
| Apr 10, 3:54 AM CDT | Wind Advisory | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 33 more | 15 hr |
| Apr 10, 3:55 AM CDT | Wind Advisory | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more | 12 hr |
| Apr 10, 1:30 PM CDT | Mesoscale Discussion | SPC | Allamakee, Buchanan, Clayton, Delaware, Dubuque, Fayette and 5 more | 2 hr |
| Apr 10, 3:19 PM CDT | Tornado Watch | SPC | Allamakee, Clayton, Fayette, Howard, Winneshiek | 7 hr |
| Apr 10, 3:39 PM CDT | Severe Thunderstorm Warning | ARX | Howard | 41 min |
| Apr 10, 4:11 PM CDT | Severe Thunderstorm Warning | ARX | Winneshiek | 34 min |
| Apr 10, 5:03 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 27 min |
| Apr 10, 5:03 PM CDT | Mesoscale Discussion | SPC | Cedar, Clinton, Davis, Delaware, Des Moines, Dubuque and 12 more | 57 min |
| Apr 10, 6:05 PM CDT | Tornado Watch | SPC | Clinton, Des Moines, Jackson, Lee, Louisa, Muscatine and 1 more | 7 hr |
| Apr 10, 8:35 PM CDT | Severe Thunderstorm Warning | DVN | Louisa | 55 min |
| Apr 12, 1:48 PM CDT | Red Flag Warning | FSD | 4 hr | |
| Apr 13, 10:07 PM CDT | Wind Advisory | OAX | Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more | 27 hr |
| Apr 14, 12:00 PM CDT | River Flood Warning | DVN | Lee | 21 days |
| Apr 14, 3:05 PM CDT | Wind Advisory | ARX | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 31 hr |
| Apr 15, 4:30 AM CDT | Wind Advisory | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 13 more | 15 hr |
| Apr 15, 6:59 AM CDT | Wind Advisory | DMX | Black Hawk, Bremer, Butler, Cerro Gordo, Franklin, Grundy and 15 more | 9 hr |
| Apr 15, 10:41 AM CDT | River Flood Warning | FSD | Clay | 34 hr |
| Apr 15, 10:41 AM CDT | River Flood Warning | FSD | Buena Vista, Clay | 11 hr |
| Apr 15, 9:23 PM CDT | River Flood Warning | OAX | Mills | 36 hr |
| Apr 15, 9:23 PM CDT | River Flood Warning | OAX | Fremont | 167 days |
| Apr 18, 3:52 AM CDT | Winter Storm Watch | ARX | Allamakee, Howard, Winneshiek | 18 hr |
| Apr 18, 10:30 AM CDT | River Flood Warning | FSD | Clay | 6 days |
| Apr 18, 3:33 PM CDT | Winter Weather Advisory | DMX | Cerro Gordo, Emmet, Hancock, Kossuth, Palo Alto, Winnebago and 1 more | 24 hr |
| Apr 18, 9:22 PM CDT | River Flood Warning | FSD | Buena Vista, Clay | 12 days |
| Apr 18, 9:49 PM CDT | Winter Weather Advisory | ARX | Allamakee, Chickasaw, Floyd, Howard, Mitchell, Winneshiek | 24 hr |
| Apr 19, 3:11 AM CDT | Severe Thunderstorm Warning | OAX | Fremont | 34 min |
| Apr 19, 4:46 AM CDT | Severe Thunderstorm Warning | DMX | Ringgold, Taylor | 24 min |
| Apr 19, 5:21 AM CDT | Special Weather Statement | DVN | Des Moines, Henry, Jefferson, Lee, Van Buren | 114 min |
| Apr 19, 5:52 AM CDT | Mesoscale Discussion | SPC | Appanoose, Davis, Decatur, Lee, Ringgold, Van Buren and 1 more | 83 min |
| Apr 19, 7:32 AM CDT | Special Weather Statement | DVN | Henry, Jefferson, Washington | 58 min |
| Apr 19, 8:31 AM CDT | Special Weather Statement | DVN | Louisa | 59 min |
| Apr 19, 10:14 AM CDT | River Flood Warning | DMX | Humboldt | 6 days |
| Apr 19, 10:14 AM CDT | Special Weather Statement | DVN | Delaware, Dubuque, Linn | 61 min |
| Apr 20, 10:49 AM CDT | River Flood Warning | DMX | Boone, Hamilton, Webster | 4 days |
| Apr 20, 8:39 PM CDT | River Flood Warning | DMX | Humboldt, Kossuth | 4 days |
| Apr 23, 4:11 AM CDT | River Flood Advisory | OAX | Mills | 36 hr |
| Apr 24, 6:34 AM CDT | River Flood Warning | OAX | Mills | 11 hr |
| Apr 25, 12:11 AM CDT | River Flood Advisory | OAX | Mills | 36 hr |
| Apr 25, 8:57 PM CDT | River Flood Warning | DMX | Humboldt, Kossuth | 5 days |
| Apr 25, 8:57 PM CDT | River Flood Warning | DMX | Boone, Hamilton, Webster | 3 days |
| Apr 26, 9:04 AM CDT | River Flood Warning | DVN | Clinton, Scott | 7 days |
| Apr 26, 10:25 AM CDT | River Flood Warning | DMX | Humboldt | 44 hr |
| Apr 26, 5:21 PM CDT | River Flood Advisory | OAX | Mills | 7 days |
| Apr 26, 9:32 PM CDT | River Flood Warning | DVN | Iowa, Johnson | 5 days |
| Apr 28, 3:27 AM CDT | Frost Advisory | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 3 more | 29 hr |
| Apr 28, 3:57 PM CDT | Wind Advisory | OAX | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 28 hr |
| Apr 29, 3:12 AM CDT | Wind Advisory | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 16 hr |
| Apr 29, 3:33 AM CDT | River Flood Warning | DMX | Black Hawk | 25 hr |
| Apr 29, 9:11 PM CDT | Wind Advisory | FSD | Lyon, O'Brien, Osceola, Plymouth, Sioux, Woodbury | 28 hr |
| Apr 30, 3:31 PM CDT | River Flood Warning | OAX | Mills | 4 days |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 65 |
| Tornado Warning | 30 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 10 |
| Special Weather Statement | 7 |
| Flooding | |
| River Flood Warning | 19 |
| River Flood Advisory | 3 |
| Winter | |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 2 |
| Cold | |
| Frost Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 15 |
| Fire | |
| Red Flag Warning | 1 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Buena Vista County23
- Kossuth County21
- Cherokee County19
- Clay County17
- Woodbury County17
- Palo Alto County16
- Jackson County15
- Scott County14
- Ida County14
- Plymouth County14
- Humboldt County14
- Winnebago County14
- Clinton County14
- Louisa County14
- Hancock County13
- Pocahontas County13
- Worth County13
- Dubuque County13
- Linn County13
- Howard County13
- Mills County12
- Delaware County12
- Johnson County12
- Jones County12
- Muscatine County12
- Winneshiek County12
- Monona County11
- Des Moines County11
- Jefferson County11
- Lee County11
- Washington County11
- O'Brien County10
- Sac County10
- Cedar County10
- Henry County10
- Iowa County10
- Allamakee County10
- Cerro Gordo County9
- Emmet County9
- Webster County9
59 more counties
- Mitchell County9
- Fremont County8
- Mahaska County8
- Keokuk County8
- Van Buren County8
- Chickasaw County8
- Floyd County8
- Osceola County7
- Sioux County7
- Harrison County7
- Page County7
- Pottawattamie County7
- Shelby County7
- Davis County7
- Hamilton County7
- Wapello County7
- Wright County7
- Benton County7
- Dickinson County6
- Montgomery County6
- Appanoose County6
- Black Hawk County6
- Boone County6
- Calhoun County6
- Franklin County6
- Monroe County6
- Poweshiek County6
- Wayne County6
- Buchanan County6
- Fayette County6
- Lyon County5
- Audubon County5
- Bremer County5
- Butler County5
- Carroll County5
- Crawford County5
- Greene County5
- Guthrie County5
- Hardin County5
- Clayton County5
- Cass County4
- Decatur County4
- Grundy County4
- Jasper County4
- Lucas County4
- Marion County4
- Marshall County4
- Ringgold County4
- Tama County4
- Taylor County4
- Adams County3
- Clarke County3
- Story County3
- Union County3
- Warren County3
- Adair County2
- Dallas County2
- Madison County2
- Polk County2
Nearby
Alerts in force nowTornadoes on recordThe radar archive20102012
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.