Alert archive / Iowa / 2020
Weather alerts in Iowa, September 2020
55 weather alerts in September 2020, 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 2020. Tap one for its archive.
- Alerts
- 55
- Warnings
- 22
- Watches
- 3
- Advisories
- 9
- Busiest day
- September 6, 202031 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 2, 1:58 AM CDT | Dense Fog Advisory | OAX | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 7 hr |
| Sep 2, 2:21 AM CDT | Dense Fog Advisory | DMX | Adair, Adams, Cass, Ringgold, Taylor, Union | 7 hr |
| Sep 5, 7:53 PM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 19 more | 2 hr |
| Sep 5, 9:34 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 47 more | 7 hr |
| Sep 5, 11:23 PM CDT | Special Weather Statement | ARX | Howard, Mitchell | 52 min |
| Sep 5, 11:26 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Bremer, Buchanan, Butler, Cerro Gordo and 28 more | 94 min |
| Sep 6, 12:10 AM CDT | Special Weather Statement | ARX | Allamakee, Chickasaw, Clayton, Fayette, Howard, Mitchell and 1 more | 65 min |
| Sep 6, 12:39 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer | 36 min |
| Sep 6, 12:56 AM CDT | Severe Thunderstorm Warning | ARX | Fayette | 49 min |
| Sep 6, 12:58 AM CDT | Severe Thunderstorm Warning | DVN | Buchanan | 62 min |
| Sep 6, 1:06 AM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 28 more | 84 min |
| Sep 6, 1:15 AM CDT | Special Weather Statement | ARX | Allamakee, Chickasaw, Clayton, Fayette, Howard, Winneshiek | 60 min |
| Sep 6, 1:32 AM CDT | Severe Thunderstorm Warning | DMX | Emmet, Hancock, Kossuth, Winnebago | 43 min |
| Sep 6, 1:35 AM CDT | Severe Thunderstorm Warning | DVN | Buchanan, Delaware | 55 min |
| Sep 6, 1:41 AM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Howard | 49 min |
| Sep 6, 2:13 AM CDT | Severe Thunderstorm Warning | ARX | Fayette, Winneshiek | 47 min |
| Sep 6, 2:14 AM CDT | Severe Thunderstorm Warning | DMX | Emmet, Hancock, Kossuth, Winnebago | 46 min |
| Sep 6, 2:17 AM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque, Jones, Linn | 58 min |
| Sep 6, 2:21 AM CDT | Severe Thunderstorm Warning | DMX | Bremer | 19 min |
| Sep 6, 2:32 AM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 45 more | 88 min |
| Sep 6, 2:53 AM CDT | Severe Thunderstorm Watch | SPC | Benton, Black Hawk, Boone, Bremer, Buchanan, Butler and 33 more | 6 hr |
| Sep 6, 2:56 AM CDT | Severe Thunderstorm Warning | ARX | Clayton | 49 min |
| Sep 6, 2:57 AM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Kossuth, Winnebago, Worth | 48 min |
| Sep 6, 3:14 AM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock, Kossuth, Wright | 46 min |
| Sep 6, 3:14 AM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque, Jones | 32 min |
| Sep 6, 3:40 AM CDT | Severe Thunderstorm Warning | DMX | Butler, Cerro Gordo, Franklin, Hancock, Hardin, Wright | 50 min |
| Sep 6, 3:42 AM CDT | Severe Thunderstorm Warning | ARX | Floyd | 48 min |
| Sep 6, 4:04 AM CDT | Severe Thunderstorm Warning | DVN | Clinton, Scott | 41 min |
| Sep 6, 4:28 AM CDT | Severe Thunderstorm Warning | DVN | Cedar, Delaware, Jones, Linn | 47 min |
| Sep 6, 5:14 AM CDT | Special Weather Statement | DVN | Scott | 31 min |
| Sep 6, 5:30 AM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Boone, Bremer, Buchanan, Butler and 31 more | 90 min |
| Sep 6, 5:54 AM CDT | Special Weather Statement | ARX | Allamakee, Chickasaw, Howard, Winneshiek | 51 min |
| Sep 6, 9:03 AM CDT | Special Weather Statement | DVN | Linn | 42 min |
| Sep 6, 9:32 PM CDT | Mesoscale Discussion | SPC | Clinton, Scott | 118 min |
| Sep 7, 7:14 PM CDT | Mesoscale Discussion | SPC | Appanoose, Clarke, Davis, Decatur, Des Moines, Henry and 7 more | 2 hr |
| Sep 7, 7:49 PM CDT | Special Weather Statement | DVN | Van Buren | 41 min |
| Sep 7, 8:17 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Ringgold, Union | 21 min |
| Sep 7, 9:40 PM CDT | Special Weather Statement | DVN | Louisa, Washington | 35 min |
| Sep 7, 10:49 PM CDT | Special Weather Statement | DVN | Scott | 26 min |
| Sep 8, 2:12 AM CDT | Special Weather Statement | DVN | Des Moines | 33 min |
| Sep 8, 2:16 AM CDT | Severe Thunderstorm Warning | DVN | Des Moines | 44 min |
| Sep 8, 3:31 AM CDT | Special Weather Statement | DVN | Scott | 29 min |
| Sep 8, 10:34 PM CDT | Special Weather Statement | DVN | Lee | 41 min |
| Sep 11, 2:28 PM CDT | Flash Flood Watch | DVN | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 15 more | 15 hr |
| Sep 13, 4:02 AM CDT | Dense Fog Advisory | OAX | Fremont, Harrison, Mills, Monona, Montgomery, Page and 2 more | 5 hr |
| Sep 13, 4:04 AM CDT | Dense Fog Advisory | DMX | Adair, Adams, Audubon, Boone, Calhoun, Carroll and 21 more | 5 hr |
| Sep 13, 4:33 AM CDT | Dense Fog Advisory | FSD | Buena Vista, Cherokee, Clay, Ida, O'Brien, Plymouth and 2 more | 4 hr |
| Sep 23, 5:55 AM CDT | Dense Fog Advisory | OAX | Fremont, Mills, Montgomery, Page, Pottawattamie, Shelby | 3 hr |
| Sep 23, 6:07 AM CDT | Dense Fog Advisory | DMX | Adams, Cass, Decatur, Ringgold, Taylor, Union | 3 hr |
| Sep 24, 9:22 AM CDT | Special Weather Statement | ARX | Winneshiek | 53 min |
| Sep 24, 10:15 AM CDT | Special Weather Statement | ARX | Allamakee, Winneshiek | 75 min |
| Sep 25, 12:32 AM CDT | Dense Fog Advisory | ARX | Allamakee | 7 hr |
| Sep 29, 10:47 AM CDT | Red Flag Warning | FSD | Cherokee, Ida, Lyon, O'Brien, Plymouth, Sioux and 1 more | 8 hr |
| Sep 29, 2:36 PM CDT | Wind Advisory | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 29 hr |
| Sep 30, 3:33 AM CDT | Red Flag Warning | FSD | Buena Vista, Cherokee, Ida, Plymouth, Sioux, Woodbury | 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 | 20 |
| Severe Thunderstorm Watch | 2 |
| Mesoscale Discussion | 7 |
| Special Weather Statement | 14 |
| Flooding | |
| Flash Flood Watch | 1 |
| Wind and dust | |
| Wind Advisory | 1 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Delaware County12
- Hancock County12
- Buchanan County10
- Cerro Gordo County10
- Chickasaw County10
- Fayette County10
- Howard County10
- Kossuth County10
- Winnebago County10
- Winneshiek County10
- Linn County10
- Allamakee County9
- Bremer County9
- Wright County9
- Scott County9
- Benton County8
- Black Hawk County8
- Butler County8
- Franklin County8
- Hardin County8
- Tama County8
- Jones County8
- Clayton County7
- Emmet County7
- Floyd County7
- Grundy County7
- Mitchell County7
- Worth County7
- Clinton County7
- Dubuque County7
- Iowa County7
- Johnson County7
- Marshall County7
- Washington County7
- Cedar County6
- Hamilton County6
- Humboldt County6
- Poweshiek County6
- Boone County5
- Clay County5
59 more counties
- Dickinson County5
- Jackson County5
- Jasper County5
- Story County5
- Webster County5
- Des Moines County5
- Louisa County5
- Ringgold County4
- Union County4
- Buena Vista County4
- Keokuk County4
- O'Brien County4
- Osceola County4
- Palo Alto County4
- Muscatine County4
- Cherokee County4
- Ida County4
- Plymouth County4
- Sioux County4
- Woodbury County4
- Fremont County3
- Mills County3
- Montgomery County3
- Page County3
- Pottawattamie County3
- Shelby County3
- Adams County3
- Cass County3
- Taylor County3
- Mahaska County3
- Polk County3
- Clarke County3
- Decatur County3
- Lee County3
- Van Buren County3
- Harrison County2
- Monona County2
- Adair County2
- Calhoun County2
- Pocahontas County2
- Henry County2
- Jefferson County2
- Lyon County2
- Appanoose County1
- Davis County1
- Lucas County1
- Monroe County1
- Wapello County1
- Wayne County1
- Audubon County1
- Carroll County1
- Crawford County1
- Dallas County1
- Greene County1
- Guthrie County1
- Madison County1
- Marion County1
- Sac County1
- Warren County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20192021
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.