Alert archive / Iowa / 2012
Weather alerts in Iowa, September 2012
122 weather alerts in September 2012, 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 2012. Tap one for its archive.
- Alerts
- 122
- Warnings
- 72
- Watches
- 15
- Advisories
- 7
- Busiest day
- September 5, 201249 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 3, 7:48 AM CDT | Special Weather Statement | OAX | Harrison, Monona | 27 min |
| Sep 3, 8:09 AM CDT | Special Weather Statement | OAX | Harrison | 36 min |
| Sep 3, 8:47 AM CDT | Special Weather Statement | OAX | Shelby | 43 min |
| Sep 4, 4:39 AM CDT | Dense Fog Advisory | ARX | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 4 hr |
| Sep 4, 1:33 PM CDT | Mesoscale Discussion | SPC | Allamakee, Bremer, Chickasaw, Clayton, Delaware, Fayette and 2 more | 117 min |
| Sep 4, 3:27 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Butler, Chickasaw and 9 more | 8 hr |
| Sep 4, 5:08 PM CDT | Mesoscale Discussion | SPC | Harrison, Monona | 97 min |
| Sep 4, 5:17 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 28 min |
| Sep 4, 6:09 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton | 36 min |
| Sep 4, 6:37 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton | 38 min |
| Sep 4, 6:38 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 52 min |
| Sep 4, 6:39 PM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Butler, Chickasaw and 9 more | 66 min |
| Sep 4, 7:06 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 24 min |
| Sep 4, 7:27 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Cherokee, Clay, Dickinson, Lyon, O'Brien and 3 more | 63 min |
| Sep 4, 7:35 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 70 min |
| Sep 4, 7:45 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 6 hr |
| Sep 4, 8:09 PM CDT | Flash Flood Warning | ARX | Allamakee, Clayton | 6 hr |
| Sep 4, 8:14 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 46 min |
| Sep 4, 8:30 PM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Butler, Chickasaw and 8 more | 60 min |
| Sep 4, 8:51 PM CDT | Severe Thunderstorm Watch | SPC | Buchanan, Clinton, Delaware, Dubuque, Jackson, Jones | 5 hr |
| Sep 4, 8:55 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, O'Brien, Osceola, Sioux | 50 min |
| Sep 4, 8:57 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Plymouth, Sioux, Woodbury | 48 min |
| Sep 4, 9:32 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, O'Brien, Osceola | 58 min |
| Sep 4, 9:44 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Clay, Ida, O'Brien, Plymouth and 1 more | 61 min |
| Sep 4, 9:51 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Calhoun, Cerro Gordo, Clay, Dickinson, Emmet and 12 more | 54 min |
| Sep 4, 10:01 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Palo Alto | 44 min |
| Sep 4, 10:08 PM CDT | Special Weather Statement | DVN | Cedar, Clinton, Muscatine, Scott | 52 min |
| Sep 4, 10:10 PM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 65 min |
| Sep 4, 10:15 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 45 min |
| Sep 4, 10:19 PM CDT | Severe Thunderstorm Watch | SPC | Black Hawk, Bremer, Butler, Calhoun, Cerro Gordo, Emmet and 14 more | 5 hr |
| Sep 4, 10:22 PM CDT | Severe Thunderstorm Warning | DMX | Palo Alto, Pocahontas | 23 min |
| Sep 4, 10:28 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Dickinson, O'Brien, Osceola | 47 min |
| Sep 4, 10:42 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Winneshiek | 33 min |
| Sep 4, 10:44 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Kossuth, Palo Alto | 46 min |
| Sep 4, 10:45 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, O'Brien, Plymouth, Sioux | 45 min |
| Sep 4, 10:47 PM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Kossuth, Palo Alto, Pocahontas | 43 min |
| Sep 4, 11:09 PM CDT | Flash Flood Warning | ARX | Allamakee, Winneshiek | 5 hr |
| Sep 4, 11:09 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Kossuth, Winnebago | 51 min |
| Sep 4, 11:14 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 46 min |
| Sep 4, 11:16 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 4 hr |
| Sep 4, 11:27 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, Ida, Plymouth, Woodbury | 48 min |
| Sep 4, 11:36 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton, Fayette, Winneshiek | 47 min |
| Sep 4, 11:37 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Winnebago, Worth | 38 min |
| Sep 4, 11:59 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 61 min |
| Sep 5, 12:12 AM CDT | Severe Thunderstorm Warning | ARX | Floyd, Mitchell | 63 min |
| Sep 5, 12:14 AM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Worth | 16 min |
| Sep 5, 12:14 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Humboldt, Pocahontas, Webster | 46 min |
| Sep 5, 12:31 AM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Howard | 44 min |
| Sep 5, 1:06 AM CDT | Severe Thunderstorm Warning | ARX | Fayette, Winneshiek | 24 min |
| Sep 5, 1:09 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler, Grundy | 29 min |
| Sep 5, 1:14 AM CDT | Mesoscale Discussion | SPC | Allamakee, Audubon, Benton, Black Hawk, Boone, Bremer and 54 more | 91 min |
| Sep 5, 1:23 AM CDT | Special Weather Statement | DVN | Buchanan, Delaware | 52 min |
| Sep 5, 1:28 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 32 min |
| Sep 5, 1:51 AM CDT | Flash Flood Warning | ARX | Clayton, Fayette | 3 hr |
| Sep 5, 1:54 AM CDT | Special Weather Statement | DVN | Benton, Buchanan, Delaware | 51 min |
| Sep 5, 1:59 AM CDT | Flash Flood Warning | ARX | Allamakee, Clayton | 3 hr |
| Sep 5, 2:21 AM CDT | Special Weather Statement | DVN | Delaware, Dubuque | 54 min |
| Sep 5, 3:05 AM CDT | Special Weather Statement | DVN | Cedar, Clinton, Iowa, Jackson, Johnson, Jones and 1 more | 55 min |
| Sep 5, 3:41 AM CDT | Severe Thunderstorm Warning | DVN | Cedar, Des Moines, Henry, Johnson, Louisa, Muscatine and 1 more | 64 min |
| Sep 5, 3:43 AM CDT | Mesoscale Discussion | SPC | Benton, Cedar, Clinton, Des Moines, Dubuque, Henry and 14 more | 92 min |
| Sep 5, 4:16 AM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Henry, Jefferson, Lee, Louisa, Scott and 1 more | 59 min |
| Sep 6, 9:06 PM CDT | Severe Thunderstorm Warning | FSD | O'Brien, Sioux | 39 min |
| Sep 6, 9:33 PM CDT | Mesoscale Discussion | SPC | Audubon, Boone, Buena Vista, Butler, Calhoun, Carroll and 25 more | 117 min |
| Sep 6, 9:34 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee, O'Brien | 26 min |
| Sep 6, 10:38 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 22 min |
| Sep 6, 10:42 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Pocahontas, Sac | 48 min |
| Sep 6, 11:15 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Carroll, Greene, Webster | 45 min |
| Sep 6, 11:53 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Greene | 27 min |
| Sep 6, 11:56 PM CDT | Mesoscale Discussion | SPC | Audubon, Black Hawk, Boone, Buena Vista, Calhoun, Carroll and 33 more | 2 hr |
| Sep 7, 1:06 AM CDT | Special Weather Statement | DVN | Johnson | 54 min |
| Sep 7, 1:18 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 42 min |
| Sep 7, 1:20 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Greene, Story | 40 min |
| Sep 7, 1:45 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Poweshiek, Tama | 45 min |
| Sep 7, 1:48 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Pocahontas, Sac, Webster | 42 min |
| Sep 7, 1:51 AM CDT | Severe Thunderstorm Warning | DVN | Cedar, Johnson, Muscatine | 39 min |
| Sep 7, 1:58 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Polk, Story | 47 min |
| Sep 7, 2:35 AM CDT | Special Weather Statement | DVN | Cedar, Johnson, Scott | 85 min |
| Sep 7, 2:47 AM CDT | Special Weather Statement | DVN | Benton, Iowa | 88 min |
| Sep 7, 2:54 AM CDT | Special Weather Statement | DVN | Louisa | 81 min |
| Sep 7, 3:05 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Hamilton, Story, Webster | 40 min |
| Sep 7, 3:17 AM CDT | Severe Thunderstorm Warning | DVN | Louisa | 13 min |
| Sep 7, 3:25 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Mahaska, Poweshiek | 50 min |
| Sep 7, 3:56 AM CDT | Severe Thunderstorm Warning | DVN | Iowa, Johnson, Keokuk, Washington | 34 min |
| Sep 7, 4:13 AM CDT | Severe Thunderstorm Warning | DVN | Keokuk | 32 min |
| Sep 7, 5:20 AM CDT | Severe Thunderstorm Warning | DVN | Louisa, Muscatine | 40 min |
| Sep 8, 3:34 AM CDT | Red Flag Warning | FSD | 15 hr | |
| Sep 8, 3:46 AM CDT | Red Flag Warning | OAX | Monona | 15 hr |
| Sep 8, 4:19 PM CDT | Fire Weather Watch | FSD | 19 hr | |
| Sep 9, 11:30 AM CDT | Red Flag Warning | FSD | 58 hr | |
| Sep 9, 12:45 PM CDT | Red Flag Warning | OAX | Monona | 30 hr |
| Sep 10, 4:10 AM CDT | Fire Weather Watch | DMX | Audubon, Calhoun, Carroll, Cass, Cerro Gordo, Crawford and 13 more | 11 hr |
| Sep 10, 4:10 AM CDT | Fire Weather Watch | OAX | Harrison, Monona, Pottawattamie, Shelby | 11 hr |
| Sep 10, 2:40 PM CDT | Red Flag Warning | ARX | Chickasaw, Floyd, Howard, Mitchell | 30 hr |
| Sep 10, 3:24 PM CDT | Red Flag Warning | DMX | Adair, Adams, Audubon, Boone, Bremer, Butler and 30 more | 28 hr |
| Sep 10, 3:39 PM CDT | Red Flag Warning | OAX | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 27 hr |
| Sep 14, 3:34 AM CDT | Dense Fog Advisory | DVN | Clinton, Des Moines, Henry, Lee, Louisa, Muscatine and 1 more | 4 hr |
| Sep 17, 2:15 PM CDT | Special Weather Statement | DVN | Scott | 60 min |
| Sep 17, 3:09 PM CDT | Frost Advisory | FSD | Clay, Dickinson, Lyon, O'Brien, Osceola | 17 hr |
| Sep 17, 3:14 PM CDT | Special Weather Statement | DVN | Des Moines | 61 min |
| Sep 18, 11:59 AM CDT | Fire Weather Watch | FSD | 16 hr | |
| Sep 18, 3:36 PM CDT | Fire Weather Watch | OAX | Harrison, Monona, Shelby | 11 hr |
| Sep 19, 2:22 AM CDT | Red Flag Warning | OAX | Harrison, Monona | 17 hr |
| Sep 19, 4:11 AM CDT | Red Flag Warning | FSD | 16 hr | |
| Sep 19, 6:37 PM CDT | Special Weather Statement | DVN | Jones | 23 min |
| Sep 19, 7:01 PM CDT | Special Weather Statement | DVN | Jackson | 29 min |
| Sep 21, 12:57 PM CDT | Red Flag Warning | FSD | 6 hr | |
| Sep 21, 1:13 PM CDT | Special Weather Statement | DVN | Louisa | 62 min |
| Sep 21, 2:15 PM CDT | Special Weather Statement | DVN | Scott | 60 min |
| Sep 21, 2:50 PM CDT | Freeze Watch | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more | 25 hr |
| Sep 21, 2:54 PM CDT | Freeze Watch | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more | 24 hr |
| Sep 21, 2:55 PM CDT | Freeze Watch | ARX | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 24 hr |
| Sep 21, 3:28 PM CDT | Freeze Watch | OAX | Harrison, Mills, Monona, Montgomery, Page, Pottawattamie and 1 more | 12 hr |
| Sep 21, 3:41 PM CDT | Freeze Watch | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 11 hr |
| Sep 22, 3:09 AM CDT | Freeze Warning | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 29 hr |
| Sep 22, 3:29 AM CDT | Freeze Warning | DMX | Adair, Adams, Audubon, Black Hawk, Boone, Bremer and 33 more | 29 hr |
| Sep 22, 3:35 AM CDT | Freeze Warning | OAX | Harrison, Mills, Monona, Montgomery, Page, Pottawattamie and 1 more | 29 hr |
| Sep 22, 3:06 PM CDT | Freeze Warning | ARX | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 17 hr |
| Sep 22, 3:16 PM CDT | Frost Advisory | DMX | Appanoose, Clarke, Davis, Decatur, Lucas, Madison and 6 more | 17 hr |
| Sep 22, 3:24 PM CDT | Frost Advisory | OAX | Fremont | 18 hr |
| Sep 22, 3:55 PM CDT | Frost Advisory | DVN | Des Moines, Henry, Jefferson, Lee, Louisa, Muscatine and 2 more | 16 hr |
| Sep 22, 3:55 PM CDT | Freeze Warning | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 9 more | 16 hr |
| Sep 23, 3:44 PM CDT | Frost Advisory | DVN | Clinton, Des Moines, Henry, Jackson, Lee, Louisa and 2 more | 15 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 | 53 |
| Severe Thunderstorm Watch | 5 |
| Mesoscale Discussion | 10 |
| Special Weather Statement | 18 |
| Flooding | |
| Flash Flood Warning | 4 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 5 |
| Frost Advisory | 5 |
| Fire | |
| Red Flag Warning | 10 |
| Fire Weather Watch | 5 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Allamakee County20
- Clayton County19
- O'Brien County14
- Calhoun County14
- Pocahontas County14
- Fayette County13
- Winneshiek County13
- Buena Vista County13
- Webster County13
- Palo Alto County12
- Scott County12
- Louisa County12
- Chickasaw County11
- Howard County11
- Delaware County11
- Grundy County11
- Cherokee County11
- Clay County11
- Hancock County11
- Humboldt County11
- Kossuth County11
- Sac County11
- Monona County10
- Floyd County10
- Bremer County10
- Butler County10
- Sioux County10
- Cerro Gordo County10
- Muscatine County10
- Greene County10
- Johnson County10
- Harrison County9
- Mitchell County9
- Black Hawk County9
- Buchanan County9
- Dubuque County9
- Plymouth County9
- Clinton County9
- Hamilton County9
- Winnebago County9
59 more counties
- Worth County9
- Wright County9
- Cedar County9
- Boone County9
- Story County9
- Dickinson County8
- Osceola County8
- Ida County8
- Jackson County8
- Emmet County8
- Franklin County8
- Carroll County8
- Iowa County8
- Des Moines County8
- Shelby County7
- Lyon County7
- Jones County7
- Hardin County7
- Audubon County7
- Crawford County7
- Guthrie County7
- Jasper County7
- Keokuk County7
- Marshall County7
- Polk County7
- Poweshiek County7
- Henry County7
- Woodbury County6
- Benton County6
- Dallas County6
- Mahaska County6
- Washington County6
- Linn County5
- Tama County5
- Jefferson County5
- Lee County5
- Marion County4
- Madison County4
- Cass County4
- Pottawattamie County4
- Wapello County3
- Van Buren County3
- Lucas County3
- Monroe County3
- Warren County3
- Adair County3
- Adams County3
- Ringgold County3
- Taylor County3
- Union County3
- Mills County3
- Montgomery County3
- Page County3
- Fremont County2
- Appanoose County2
- Clarke County2
- Davis County2
- Decatur County2
- Wayne County2
Nearby
Alerts in force nowTornadoes on recordThe radar archive20112013
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.