Alert archive / Wisconsin / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in Wisconsin, 2009
153 severe thunderstorm warnings in 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 2009. Tap one for its archive.
- Severe Thunderstorm Warnings
- 153
- Busiest month
- June48 severe thunderstorm warnings
- Busiest day
- June 19, 200936 severe thunderstorm warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
84 of 153 severe thunderstorm warnings covering Wisconsin in 2009 had a qualifying storm report inside them; 173 of 241 hail, wind and damage reports fell inside a warning, on average 23 minutes after it went out.
Wisconsin, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Severe thunderstorm warnings | 153 | 84 | 45% | 241 | 72% | 23 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Duluth, MN: severe thunderstorm warnings | 49 | 15 | 69% | 23 | 96% | 22 min |
| NWS Green Bay, WI: severe thunderstorm warnings | 14 | 4 | 71% | 12 | 42% | 21 min |
| NWS Twin Cities, MN: severe thunderstorm warnings | 94 | 49 | 48% | 135 | 62% | 22 min |
| NWS La Crosse, WI: severe thunderstorm warnings | 78 | 50 | 36% | 151 | 85% | 25 min |
| NWS Milwaukee, WI: severe thunderstorm warnings | 53 | 36 | 32% | 128 | 71% | 25 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
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 |
|---|---|---|---|---|
| Feb 26, 1:14 PM CST | Severe Thunderstorm Warning | ARX | Crawford | 37 min |
| Mar 24, 10:04 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Rock | 41 min |
| Mar 24, 10:17 PM CDT | Severe Thunderstorm Warning | MKX | Jefferson, Walworth | 58 min |
| Mar 24, 10:56 PM CDT | Severe Thunderstorm Warning | MKX | Waukesha | 29 min |
| Apr 24, 4:39 PM CDT | Severe Thunderstorm Warning | ARX | Buffalo | 51 min |
| Apr 24, 4:41 PM CDT | Severe Thunderstorm Warning | MPX | Dunn, Eau Claire, Pepin | 49 min |
| Apr 24, 5:19 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa | 56 min |
| Apr 24, 5:28 PM CDT | Severe Thunderstorm Warning | ARX | Buffalo, Trempealeau | 47 min |
| Apr 24, 5:29 PM CDT | Severe Thunderstorm Warning | MPX | Eau Claire | 61 min |
| Apr 24, 5:44 PM CDT | Severe Thunderstorm Warning | ARX | Taylor | 46 min |
| Apr 24, 5:54 PM CDT | Severe Thunderstorm Warning | DLH | Price | 51 min |
| Apr 24, 6:22 PM CDT | Severe Thunderstorm Warning | MPX | Eau Claire | 16 min |
| Apr 24, 6:29 PM CDT | Severe Thunderstorm Warning | DLH | Price | 46 min |
| Apr 24, 6:31 PM CDT | Severe Thunderstorm Warning | ARX | Clark | 59 min |
| Apr 24, 6:40 PM CDT | Severe Thunderstorm Warning | ARX | Buffalo, Trempealeau | 35 min |
| Apr 24, 6:44 PM CDT | Severe Thunderstorm Warning | GRB | Oneida | 61 min |
| Apr 24, 6:48 PM CDT | Severe Thunderstorm Warning | DLH | Price | 42 min |
| Apr 24, 6:58 PM CDT | Severe Thunderstorm Warning | GRB | Lincoln, Marathon, Oneida | 47 min |
| Apr 24, 7:09 PM CDT | Severe Thunderstorm Warning | DLH | Iron, Price | 66 min |
| Apr 24, 7:16 PM CDT | Severe Thunderstorm Warning | ARX | Jackson, Trempealeau | 59 min |
| Apr 24, 7:32 PM CDT | Severe Thunderstorm Warning | DLH | Ashland, Bayfield, Iron, Sawyer | 43 min |
| Apr 24, 7:41 PM CDT | Severe Thunderstorm Warning | GRB | Forest, Langlade, Lincoln, Marathon, Oneida, Portage and 2 more | 64 min |
| Apr 24, 8:04 PM CDT | Severe Thunderstorm Warning | ARX | Clark | 41 min |
| Apr 24, 8:11 PM CDT | Severe Thunderstorm Warning | ARX | Jackson | 64 min |
| Apr 24, 8:36 PM CDT | Severe Thunderstorm Warning | GRB | Marathon | 39 min |
| Apr 24, 8:41 PM CDT | Severe Thunderstorm Warning | ARX | Clark, Jackson | 34 min |
| Apr 24, 8:51 PM CDT | Severe Thunderstorm Warning | GRB | Lincoln | 24 min |
| Apr 24, 9:11 PM CDT | Severe Thunderstorm Warning | GRB | Marinette, Oconto | 34 min |
| Apr 24, 10:56 PM CDT | Severe Thunderstorm Warning | ARX | Juneau, Monroe | 29 min |
| May 5, 2:25 PM CDT | Severe Thunderstorm Warning | MPX | Barron, Dunn, Polk, Saint Croix | 65 min |
| May 5, 3:17 PM CDT | Severe Thunderstorm Warning | DLH | Burnett | 43 min |
| May 5, 3:28 PM CDT | Severe Thunderstorm Warning | DLH | Bayfield, Douglas | 32 min |
| May 5, 3:49 PM CDT | Severe Thunderstorm Warning | DLH | Douglas | 41 min |
| May 5, 3:51 PM CDT | Severe Thunderstorm Warning | MPX | Barron | 54 min |
| May 5, 3:54 PM CDT | Severe Thunderstorm Warning | DLH | Burnett, Douglas, Washburn | 51 min |
| May 5, 3:55 PM CDT | Severe Thunderstorm Warning | DLH | Ashland, Bayfield, Douglas | 50 min |
| May 5, 4:14 PM CDT | Severe Thunderstorm Warning | DLH | Bayfield, Douglas | 21 min |
| May 5, 4:27 PM CDT | Severe Thunderstorm Warning | DLH | Burnett | 48 min |
| May 5, 4:39 PM CDT | Severe Thunderstorm Warning | DLH | Burnett, Douglas, Washburn | 28 min |
| May 5, 4:44 PM CDT | Severe Thunderstorm Warning | MPX | Barron, Rusk | 61 min |
| May 5, 5:04 PM CDT | Severe Thunderstorm Warning | DLH | Burnett, Washburn | 41 min |
| May 5, 5:15 PM CDT | Severe Thunderstorm Warning | MPX | Polk | 30 min |
| May 5, 6:38 PM CDT | Severe Thunderstorm Warning | DLH | Price, Sawyer | 52 min |
| May 6, 4:52 PM CDT | Severe Thunderstorm Warning | GRB | Langlade, Oconto | 39 min |
| May 13, 5:05 PM CDT | Severe Thunderstorm Warning | ARX | Buffalo | 40 min |
| May 13, 7:46 PM CDT | Severe Thunderstorm Warning | GRB | Waushara | 29 min |
| May 13, 10:53 PM CDT | Severe Thunderstorm Warning | MKX | Milwaukee, Racine, Waukesha | 31 min |
| Jun 8, 2:04 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Green, Rock | 26 min |
| Jun 8, 2:28 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Jefferson, Rock | 47 min |
| Jun 8, 3:21 PM CDT | Severe Thunderstorm Warning | MKX | Jefferson, Walworth, Waukesha | 24 min |
| Jun 8, 3:38 PM CDT | Severe Thunderstorm Warning | MKX | Racine | 37 min |
| Jun 8, 3:58 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Racine | 32 min |
| Jun 13, 3:07 PM CDT | Severe Thunderstorm Warning | GRB | Vilas | 53 min |
| Jun 17, 10:48 PM CDT | Severe Thunderstorm Warning | MPX | Pierce | 42 min |
| Jun 17, 11:20 PM CDT | Severe Thunderstorm Warning | MPX | Pepin, Pierce | 40 min |
| Jun 18, 7:19 PM CDT | Severe Thunderstorm Warning | DLH | Burnett | 56 min |
| Jun 18, 9:56 PM CDT | Severe Thunderstorm Warning | ARX | Vernon | 42 min |
| Jun 18, 10:00 PM CDT | Severe Thunderstorm Warning | ARX | Juneau, Monroe | 45 min |
| Jun 18, 10:29 PM CDT | Severe Thunderstorm Warning | MKX | Sauk | 46 min |
| Jun 18, 10:30 PM CDT | Severe Thunderstorm Warning | ARX | Crawford, Grant | 45 min |
| Jun 18, 10:36 PM CDT | Severe Thunderstorm Warning | ARX | Monroe, Vernon | 24 min |
| Jun 18, 10:38 PM CDT | Severe Thunderstorm Warning | MKX | Columbia | 52 min |
| Jun 18, 10:59 PM CDT | Severe Thunderstorm Warning | MKX | Iowa, Sauk | 61 min |
| Jun 18, 11:01 PM CDT | Severe Thunderstorm Warning | MKX | Dane | 59 min |
| Jun 18, 11:02 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Jefferson | 43 min |
| Jun 18, 11:18 PM CDT | Severe Thunderstorm Warning | MKX | Columbia | 42 min |
| Jun 18, 11:25 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 35 min |
| Jun 18, 11:28 PM CDT | Severe Thunderstorm Warning | ARX | Crawford | 32 min |
| Jun 18, 11:47 PM CDT | Severe Thunderstorm Warning | ARX | Crawford, Grant, Richland | 28 min |
| Jun 18, 11:51 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Green, Iowa, Lafayette | 54 min |
| Jun 19, 12:01 AM CDT | Severe Thunderstorm Warning | MKX | Dane, Dodge, Jefferson, Washington, Waukesha | 59 min |
| Jun 19, 12:14 AM CDT | Severe Thunderstorm Warning | ARX | Grant | 25 min |
| Jun 19, 12:18 AM CDT | Severe Thunderstorm Warning | MKX | Dane, Green, Jefferson, Lafayette, Rock | 72 min |
| Jun 19, 12:29 AM CDT | Severe Thunderstorm Warning | MKX | Iowa | 36 min |
| Jun 19, 12:51 AM CDT | Severe Thunderstorm Warning | MKX | Green, Rock, Walworth | 54 min |
| Jun 19, 1:23 AM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Racine | 52 min |
| Jun 19, 4:08 AM CDT | Severe Thunderstorm Warning | DLH | Burnett, Washburn | 37 min |
| Jun 19, 4:43 AM CDT | Severe Thunderstorm Warning | DLH | Sawyer, Washburn | 47 min |
| Jun 19, 6:11 AM CDT | Severe Thunderstorm Warning | DLH | Price | 49 min |
| Jun 19, 6:50 AM CDT | Severe Thunderstorm Warning | GRB | Lincoln, Oneida | 55 min |
| Jun 19, 6:56 AM CDT | Severe Thunderstorm Warning | DLH | Price | 19 min |
| Jun 19, 6:58 AM CDT | Severe Thunderstorm Warning | ARX | Taylor | 47 min |
| Jun 19, 8:28 AM CDT | Severe Thunderstorm Warning | ARX | Grant | 47 min |
| Jun 19, 8:35 AM CDT | Severe Thunderstorm Warning | MKX | Lafayette | 85 min |
| Jun 19, 8:58 AM CDT | Severe Thunderstorm Warning | MKX | Green | 77 min |
| Jun 19, 9:33 AM CDT | Severe Thunderstorm Warning | MKX | Rock | 65 min |
| Jun 19, 2:54 PM CDT | Severe Thunderstorm Warning | ARX | Adams | 36 min |
| Jun 19, 3:08 PM CDT | Severe Thunderstorm Warning | MKX | Marquette | 52 min |
| Jun 19, 4:15 PM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac, Green Lake | 35 min |
| Jun 19, 6:43 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Racine, Walworth | 51 min |
| Jun 19, 6:55 PM CDT | Severe Thunderstorm Warning | MKX | Rock, Walworth | 42 min |
| Jun 25, 5:16 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Jefferson, Rock | 29 min |
| Jun 25, 5:32 PM CDT | Severe Thunderstorm Warning | MKX | Jefferson, Rock, Walworth | 43 min |
| Jun 27, 7:44 PM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dodge | 46 min |
| Jun 27, 8:13 PM CDT | Severe Thunderstorm Warning | MKX | Dodge | 47 min |
| Jul 11, 2:11 AM CDT | Severe Thunderstorm Warning | MKX | Dane | 34 min |
| Jul 11, 2:34 AM CDT | Severe Thunderstorm Warning | MKX | Dane, Jefferson | 31 min |
| Jul 14, 9:36 PM CDT | Severe Thunderstorm Warning | DLH | Burnett, Douglas | 39 min |
| Jul 14, 10:01 PM CDT | Severe Thunderstorm Warning | DLH | Bayfield, Burnett, Douglas, Sawyer, Washburn | 44 min |
| Jul 21, 6:37 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa | 38 min |
| Jul 23, 1:11 PM CDT | Severe Thunderstorm Warning | MKX | Columbia, Marquette | 19 min |
| Jul 23, 2:47 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Racine | 36 min |
| Jul 23, 3:37 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha | 33 min |
| Jul 23, 4:32 PM CDT | Severe Thunderstorm Warning | MKX | Rock, Walworth | 24 min |
| Jul 24, 5:34 AM CDT | Severe Thunderstorm Warning | DLH | Burnett, Douglas, Washburn | 39 min |
| Jul 24, 9:01 AM CDT | Severe Thunderstorm Warning | MPX | Pierce | 29 min |
| Jul 24, 9:28 AM CDT | Severe Thunderstorm Warning | MPX | Pepin, Pierce | 48 min |
| Jul 24, 1:32 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 58 min |
| Jul 24, 3:07 PM CDT | Severe Thunderstorm Warning | ARX | Crawford | 53 min |
| Jul 24, 3:48 PM CDT | Severe Thunderstorm Warning | ARX | Crawford, Grant | 57 min |
| Jul 24, 4:24 PM CDT | Severe Thunderstorm Warning | ARX | Crawford | 66 min |
| Jul 24, 4:28 PM CDT | Severe Thunderstorm Warning | MKX | Iowa, Lafayette | 92 min |
| Jul 24, 4:44 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 76 min |
| Jul 24, 5:48 PM CDT | Severe Thunderstorm Warning | MKX | Lafayette | 72 min |
| Jul 24, 5:59 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 61 min |
| Jul 27, 2:15 PM CDT | Severe Thunderstorm Warning | ARX | Clark, Jackson | 60 min |
| Jul 27, 2:50 PM CDT | Severe Thunderstorm Warning | ARX | Jackson | 25 min |
| Jul 27, 3:07 PM CDT | Severe Thunderstorm Warning | ARX | Jackson, Trempealeau | 33 min |
| Jul 27, 3:12 PM CDT | Severe Thunderstorm Warning | ARX | Jackson, Juneau | 48 min |
| Jul 27, 3:29 PM CDT | Severe Thunderstorm Warning | ARX | Monroe | 46 min |
| Jul 27, 4:12 PM CDT | Severe Thunderstorm Warning | ARX | Monroe | 48 min |
| Jul 27, 4:21 PM CDT | Severe Thunderstorm Warning | ARX | Adams | 39 min |
| Jul 27, 4:22 PM CDT | Severe Thunderstorm Warning | MKX | Marquette | 83 min |
| Jul 27, 4:44 PM CDT | Severe Thunderstorm Warning | ARX | Juneau, Monroe, Vernon | 61 min |
| Jul 27, 5:00 PM CDT | Severe Thunderstorm Warning | ARX | Crawford, Richland | 60 min |
| Jul 27, 6:59 PM CDT | Severe Thunderstorm Warning | MKX | Iowa, Lafayette | 61 min |
| Jul 27, 8:15 PM CDT | Severe Thunderstorm Warning | MKX | Green, Lafayette | 32 min |
| Aug 2, 9:07 PM CDT | Severe Thunderstorm Warning | DLH | Burnett, Washburn | 38 min |
| Aug 2, 9:16 PM CDT | Severe Thunderstorm Warning | MPX | Rusk | 44 min |
| Aug 2, 11:48 PM CDT | Severe Thunderstorm Warning | MPX | Pierce, Saint Croix | 57 min |
| Aug 3, 12:06 AM CDT | Severe Thunderstorm Warning | ARX | Clark, Taylor | 41 min |
| Aug 3, 1:41 AM CDT | Severe Thunderstorm Warning | GRB | Portage, Wood | 39 min |
| Aug 8, 8:37 AM CDT | Severe Thunderstorm Warning | MPX | Polk, Saint Croix | 38 min |
| Aug 8, 10:59 AM CDT | Severe Thunderstorm Warning | MPX | Dunn, Saint Croix | 46 min |
| Aug 8, 10:54 PM CDT | Severe Thunderstorm Warning | DLH | Bayfield, Douglas | 57 min |
| Aug 9, 12:38 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 62 min |
| Aug 9, 12:55 PM CDT | Severe Thunderstorm Warning | MKX | Lafayette | 95 min |
| Aug 9, 2:40 PM CDT | Severe Thunderstorm Warning | MKX | Rock | 50 min |
| Aug 9, 2:45 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 45 min |
| Aug 9, 3:01 PM CDT | Severe Thunderstorm Warning | MKX | Iowa, Lafayette, Sauk | 59 min |
| Aug 9, 3:16 PM CDT | Severe Thunderstorm Warning | MKX | Jefferson, Walworth, Waukesha | 44 min |
| Aug 9, 3:40 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Milwaukee, Racine, Walworth, Waukesha | 50 min |
| Aug 9, 3:48 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Green, Iowa, Lafayette | 57 min |
| Aug 9, 4:21 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Jefferson, Rock | 54 min |
| Aug 9, 4:47 PM CDT | Severe Thunderstorm Warning | MKX | Jefferson, Walworth, Waukesha | 58 min |
| Aug 9, 5:01 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Milwaukee, Racine, Waukesha | 59 min |
| Aug 9, 11:25 PM CDT | Severe Thunderstorm Warning | MKX | Rock | 50 min |
| Aug 13, 8:40 PM CDT | Severe Thunderstorm Warning | MPX | Pierce | 35 min |
| Aug 13, 10:05 PM CDT | Severe Thunderstorm Warning | ARX | Buffalo | 55 min |
| Aug 14, 4:44 PM CDT | Severe Thunderstorm Warning | GRB | Marinette | 31 min |
| Aug 20, 2:43 PM CDT | Severe Thunderstorm Warning | GRB | Calumet, Outagamie, Winnebago | 25 min |
| Aug 20, 3:18 PM CDT | Severe Thunderstorm Warning | GRB | Portage | 42 min |
| Sep 27, 4:41 PM CDT | Severe Thunderstorm Warning | ARX | Taylor | 64 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Rock County13
- Dane County12
- Jefferson County12
- Burnett County11
- Grant County11
- Walworth County10
- Douglas County10
- Lafayette County10
- Crawford County8
- Waukesha County8
- Washburn County8
- Racine County8
- Price County7
- Jackson County7
- Green County7
- Kenosha County7
- Iowa County7
- Bayfield County6
- Monroe County6
- Pierce County6
- Buffalo County5
- Clark County5
- Trempealeau County4
- Taylor County4
- Oneida County4
- Lincoln County4
- Sawyer County4
- Juneau County4
- Saint Croix County4
- Columbia County4
- Dodge County4
- Dunn County3
- Eau Claire County3
- Pepin County3
- Marathon County3
- Portage County3
- Barron County3
- Polk County3
- Milwaukee County3
- Vernon County3
22 more counties
- Sauk County3
- Marquette County3
- Chippewa County2
- Iron County2
- Ashland County2
- Langlade County2
- Wood County2
- Marinette County2
- Oconto County2
- Rusk County2
- Richland County2
- Adams County2
- Forest County1
- Shawano County1
- Waushara County1
- Vilas County1
- Washington County1
- Fond du Lac County1
- Green Lake County1
- Calumet County1
- Outagamie County1
- Winnebago County1
The busiest days
Days with the most alerts issued, by UTC date.
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.