Alert archive / Iowa / 2011
Weather alerts in Iowa, September 2011
68 weather alerts in September 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 September 2011. Tap one for its archive.
- Alerts
- 68
- Warnings
- 29
- Watches
- 5
- Advisories
- 22
- Busiest day
- September 3, 201127 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 |
|---|---|---|---|---|
| Sep 1, 10:40 AM CDT | Heat Advisory | DVN | Cedar, Des Moines, Henry, Iowa, Jefferson, Johnson and 7 more | 32 hr |
| Sep 2, 2:33 AM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 27 min |
| Sep 2, 2:56 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, O'Brien, Plymouth, Sioux | 34 min |
| Sep 2, 3:09 AM CDT | Tornado Warning | FSD | Cherokee, Plymouth | 24 min |
| Sep 2, 3:27 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay, O'Brien | 33 min |
| Sep 2, 3:27 AM CDT | Mesoscale Discussion | SPC | Buena Vista, Cerro Gordo, Clay, Emmet, Floyd, Hancock and 10 more | 93 min |
| Sep 2, 3:40 AM CDT | Severe Thunderstorm Warning | FSD | Clay, O'Brien | 35 min |
| Sep 2, 3:48 AM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 15 more | 6 hr |
| Sep 2, 3:49 AM CDT | Severe Thunderstorm Warning | DMX | Kossuth, Palo Alto | 41 min |
| Sep 2, 4:27 AM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Kossuth, Palo Alto, Pocahontas | 48 min |
| Sep 2, 5:33 AM CDT | Severe Thunderstorm Warning | DMX | Worth | 27 min |
| Sep 2, 5:46 AM CDT | Severe Thunderstorm Warning | ARX | Mitchell | 44 min |
| Sep 2, 6:15 AM CDT | Severe Thunderstorm Warning | ARX | Howard, Winneshiek | 60 min |
| Sep 2, 7:02 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Winneshiek | 58 min |
| Sep 2, 2:41 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Allamakee, Audubon, Benton, Black Hawk and 66 more | 94 min |
| Sep 2, 9:01 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Pottawattamie, Shelby | 44 min |
| Sep 2, 9:30 PM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Webster | 45 min |
| Sep 2, 9:40 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Carroll, Cass, Greene, Guthrie | 65 min |
| Sep 2, 9:43 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Pottawattamie, Shelby | 41 min |
| Sep 2, 10:04 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Benton, Black Hawk, Boone and 22 more | 86 min |
| Sep 2, 10:23 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Benton, Black Hawk, Boone, Buchanan, Cass and 26 more | 6 hr |
| Sep 2, 10:48 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Greene, Guthrie | 42 min |
| Sep 2, 11:02 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler, Grundy, Marshall, Tama | 46 min |
| Sep 2, 11:25 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Polk, Story | 34 min |
| Sep 2, 11:45 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer | 45 min |
| Sep 2, 11:50 PM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware | 55 min |
| Sep 2, 11:56 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Buchanan, Cedar, Clayton and 26 more | 94 min |
| Sep 2, 11:58 PM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 62 min |
| Sep 3, 12:48 AM CDT | Severe Thunderstorm Watch | SPC | Clayton, Fayette | 6 hr |
| Sep 3, 12:54 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton | 66 min |
| Sep 3, 1:05 AM CDT | Special Weather Statement | DVN | Delaware, Dubuque | 55 min |
| Sep 3, 1:27 AM CDT | Special Weather Statement | DVN | Buchanan, Delaware | 63 min |
| Sep 3, 1:46 AM CDT | Flash Flood Warning | ARX | Fayette | 4 hr |
| Sep 3, 2:13 AM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 47 min |
| Sep 3, 2:29 AM CDT | Special Weather Statement | DVN | Benton, Buchanan, Delaware, Dubuque, Linn | 61 min |
| Sep 3, 2:53 AM CDT | Flash Flood Warning | ARX | Clayton | 3 hr |
| Sep 3, 9:56 AM CDT | Special Weather Statement | DVN | Cedar, Clinton | 64 min |
| Sep 3, 1:45 PM CDT | Special Weather Statement | DVN | Cedar, Clinton, Muscatine, Scott | 45 min |
| Sep 3, 1:54 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Jefferson | 66 min |
| Sep 3, 2:20 PM CDT | Special Weather Statement | DVN | Scott | 55 min |
| Sep 3, 2:42 PM CDT | Special Weather Statement | DVN | Des Moines | 48 min |
| Sep 3, 2:52 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Louisa | 53 min |
| Sep 13, 3:53 AM CDT | Freeze Watch | DMX | Cerro Gordo, Emmet, Hancock, Kossuth, Palo Alto, Winnebago and 1 more | 24 hr |
| Sep 13, 3:54 AM CDT | Freeze Watch | FSD | Clay, Dickinson, Lyon, O'Brien, Osceola | 11 hr |
| Sep 13, 3:12 PM CDT | Freeze Warning | FSD | Clay, Dickinson, Lyon, O'Brien, Osceola, Sioux | 41 hr |
| Sep 13, 3:47 PM CDT | River Flood Advisory | OAX | Pottawattamie | 10 days |
| Sep 14, 3:34 AM CDT | Frost Advisory | ARX | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 28 hr |
| Sep 14, 3:48 AM CDT | Frost Advisory | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 5 more | 28 hr |
| Sep 14, 3:52 AM CDT | Frost Advisory | DMX | Audubon, Black Hawk, Boone, Bremer, Butler, Calhoun and 20 more | 28 hr |
| Sep 14, 3:52 AM CDT | Freeze Warning | DMX | Cerro Gordo, Emmet, Hancock, Kossuth, Palo Alto, Winnebago and 1 more | 28 hr |
| Sep 14, 4:02 AM CDT | Frost Advisory | FSD | Buena Vista, Cherokee, Ida, Plymouth, Woodbury | 28 hr |
| Sep 14, 4:12 AM CDT | Frost Advisory | OAX | Harrison, Monona, Pottawattamie, Shelby | 28 hr |
| Sep 14, 10:33 AM CDT | River Flood Advisory | OAX | Harrison | 9 days |
| Sep 18, 10:51 PM CDT | Dense Fog Advisory | OAX | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 10 hr |
| Sep 18, 10:54 PM CDT | Dense Fog Advisory | DMX | Adair, Adams, Audubon, Calhoun, Carroll, Cass and 13 more | 10 hr |
| Sep 18, 11:04 PM CDT | Dense Fog Advisory | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, O'Brien and 3 more | 10 hr |
| Sep 19, 3:28 PM CDT | Wind Advisory | FSD | Lyon, Osceola, Sioux | 34 hr |
| Sep 22, 3:40 PM CDT | Frost Advisory | OAX | Harrison, Monona, Shelby | 16 hr |
| Sep 25, 5:24 PM CDT | Special Weather Statement | DVN | Benton, Iowa, Johnson, Jones, Keokuk, Linn and 1 more | 51 min |
| Sep 28, 1:54 AM CDT | Dense Fog Advisory | ARX | Allamakee, Clayton, Fayette, Winneshiek | 9 hr |
| Sep 28, 2:59 AM CDT | Dense Fog Advisory | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 7 more | 8 hr |
| Sep 28, 3:04 PM CDT | Wind Advisory | ARX | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 32 hr |
| Sep 28, 3:50 PM CDT | Wind Advisory | DMX | Black Hawk, Boone, Bremer, Butler, Cerro Gordo, Emmet and 22 more | 27 hr |
| Sep 28, 3:57 PM CDT | Wind Advisory | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more | 27 hr |
| Sep 29, 3:20 AM CDT | Wind Advisory | FSD | Buena Vista, Clay, Dickinson, O'Brien, Osceola | 16 hr |
| Sep 30, 3:27 AM CDT | Frost Advisory | ARX | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 30 hr |
| Sep 30, 3:48 AM CDT | Frost Advisory | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 3 more | 28 hr |
| Sep 30, 3:29 PM CDT | Frost Advisory | DMX | Adair, Adams, Audubon, Black Hawk, Boone, Bremer and 28 more | 17 hr |
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 | 24 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 4 |
| Special Weather Statement | 8 |
| Flooding | |
| Flash Flood Warning | 2 |
| River Flood Advisory | 2 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 2 |
| Frost Advisory | 9 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Clayton County12
- Delaware County12
- Buchanan County11
- Cedar County10
- Fayette County10
- Benton County10
- Linn County10
- Johnson County9
- Kossuth County9
- Palo Alto County9
- Winneshiek County9
- Black Hawk County9
- Boone County9
- Clinton County9
- Dubuque County9
- Greene County9
- Iowa County8
- O'Brien County8
- Humboldt County8
- Pocahontas County8
- Allamakee County8
- Dallas County8
- Grundy County8
- Guthrie County8
- Jones County8
- Marshall County8
- Story County8
- Tama County8
- Scott County7
- Clay County7
- Cerro Gordo County7
- Emmet County7
- Hancock County7
- Howard County7
- Worth County7
- Bremer County7
- Hamilton County7
- Hardin County7
- Harrison County7
- Jackson County7
55 more counties
- Polk County7
- Keokuk County6
- Muscatine County6
- Floyd County6
- Mitchell County6
- Winnebago County6
- Butler County6
- Audubon County6
- Cass County6
- Jasper County6
- Pottawattamie County6
- Poweshiek County6
- Shelby County6
- Webster County6
- Louisa County5
- Washington County5
- Plymouth County5
- Cherokee County5
- Buena Vista County5
- Chickasaw County5
- Franklin County5
- Wright County5
- Adair County5
- Carroll County5
- Marion County5
- Osceola County5
- Des Moines County4
- Jefferson County4
- Sioux County4
- Adams County4
- Calhoun County4
- Crawford County4
- Madison County4
- Mahaska County4
- Monona County4
- Sac County4
- Warren County4
- Dickinson County4
- Henry County3
- Ida County3
- Union County3
- Lyon County3
- Lee County2
- Van Buren County2
- Fremont County2
- Mills County2
- Montgomery County2
- Wapello County2
- Woodbury County2
- Taylor County2
- Clarke County1
- Lucas County1
- Monroe County1
- Page County1
- Ringgold County1
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.