Alert archive / Wisconsin / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 614
The Storm Prediction Center issued this severe thunderstorm watch at Sep 4, 2012, 3:27 PM CDT for 4 states. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 4, 2012, 3:27 PM CDT (20:27 UTC)
- Expired
- Sep 4, 2012, 11:00 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 91 counties
Allamakee County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Chickasaw County, IA, Clayton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Grundy County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Gogebic County, MI, Ontonagon County, MI, Carlton County, MN, Cook County, MN, Dodge County, MN, Fillmore County, MN, Goodhue County, MN, Houston County, MN, Itasca County, MN, Koochiching County, MN, Lake County, MN, Mower County, MN, Olmsted County, MN, Pine County, MN, Saint Louis County, MN, Wabasha County, MN, Winona County, MN, Adams County, WI, Ashland County, WI, Barron County, WI, Bayfield County, WI, Brown County, WI, Buffalo County, WI, Burnett County, WI, Calumet County, WI, Chippewa County, WI, Clark County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Douglas County, WI, Dunn County, WI, Eau Claire County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Iron County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, Kenosha County, WI, La Crosse County, WI, Lafayette County, WI, Lincoln County, WI, Marathon County, WI, Milwaukee County, WI, Monroe County, WI, Oneida County, WI, Outagamie County, WI, Ozaukee County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Portage County, WI, Price County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Rusk County, WI, Saint Croix County, WI, Sauk County, WI, Sawyer County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Vilas County, WI, Walworth County, WI, Washburn County, WI, Washington County, WI, Waukesha County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI
The radar
The Duluth radar (KDLH), 123 km from the middle of the area, began a volume at 20:29 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 70%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
45 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 3:48 PM CDT | Severe Thunderstorm Warning | DLH | Saint Louis | 42 min |
| Sep 4, 4:00 PM CDT | Severe Thunderstorm Warning | ARX | Winona | 30 min |
| Sep 4, 4:17 PM CDT | Severe Thunderstorm Warning | MPX | Barron, Chippewa, Rusk | 43 min |
| Sep 4, 4:29 PM CDT | Severe Thunderstorm Warning | ARX | Winona | 46 min |
| Sep 4, 4:29 PM CDT | Severe Thunderstorm Warning | DLH | Lake, Saint Louis | 46 min |
| Sep 4, 4:39 PM CDT | Severe Thunderstorm Warning | DLH | Ashland, Bayfield | 36 min |
| Sep 4, 4:55 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa | 50 min |
| Sep 4, 5:06 PM CDT | Severe Thunderstorm Warning | MPX | Eau Claire | 39 min |
| Sep 4, 5:14 PM CDT | Severe Thunderstorm Warning | DLH | Cook, Lake, Saint Louis | 31 min |
| Sep 4, 5:17 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 28 min |
| Sep 4, 5:19 PM CDT | Severe Thunderstorm Warning | MPX | Eau Claire | 26 min |
| Sep 4, 5:29 PM CDT | Severe Thunderstorm Warning | ARX | Houston, Winona | 46 min |
| Sep 4, 5:38 PM CDT | Severe Thunderstorm Warning | ARX | Fillmore | 28 min |
| Sep 4, 5:39 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Eau Claire | 36 min |
| Sep 4, 5:41 PM CDT | Severe Thunderstorm Warning | ARX | Clark | 64 min |
| Sep 4, 5:50 PM CDT | Severe Thunderstorm Warning | ARX | Houston | 40 min |
| Sep 4, 5:56 PM CDT | Severe Thunderstorm Warning | ARX | La Crosse, Vernon | 64 min |
| Sep 4, 6:09 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton | 36 min |
| Sep 4, 6:11 PM CDT | Severe Thunderstorm Warning | MPX | Eau Claire | 30 min |
| Sep 4, 6:14 PM CDT | Severe Thunderstorm Warning | ARX | Houston | 46 min |
| Sep 4, 6:16 PM CDT | Severe Thunderstorm Warning | ARX | Clark | 29 min |
| Sep 4, 6:26 PM CDT | Severe Thunderstorm Warning | GRB | Marathon, Wood | 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, 6:48 PM CDT | Severe Thunderstorm Warning | ARX | Crawford, Vernon | 57 min |
| Sep 4, 6:59 PM CDT | Severe Thunderstorm Warning | GRB | Marathon, Portage, Wood | 46 min |
| Sep 4, 7:00 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 60 min |
| Sep 4, 7:06 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 24 min |
| Sep 4, 7:10 PM CDT | Severe Thunderstorm Warning | ARX | Richland | 65 min |
| Sep 4, 7:20 PM CDT | Severe Thunderstorm Warning | MKX | Iowa, Sauk | 55 min |
| Sep 4, 7:35 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 70 min |
| Sep 4, 7:40 PM CDT | Severe Thunderstorm Warning | GRB | Marathon, Portage, Shawano, Waupaca, Waushara | 39 min |
| Sep 4, 7:41 PM CDT | Tornado Warning | ARX | Grant | 34 min |
| Sep 4, 7:42 PM CDT | Severe Thunderstorm Warning | MQT | Ontonagon | 63 min |
| Sep 4, 7:46 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Iowa, Sauk | 59 min |
| Sep 4, 7:48 PM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dane, Sauk | 42 min |
| Sep 4, 8:09 PM CDT | Flash Flood Warning | ARX | Allamakee, Clayton | 6 hr |
| Sep 4, 8:12 PM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dane, Dodge, Green, Jefferson, Rock | 63 min |
| Sep 4, 8:16 PM CDT | Severe Thunderstorm Warning | GRB | Outagamie, Shawano, Waupaca | 35 min |
| Sep 4, 8:16 PM CDT | Severe Thunderstorm Warning | MKX | Green, Iowa, Lafayette | 59 min |
| Sep 4, 8:35 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Jefferson, Rock, Walworth, Washington, Waukesha | 55 min |
| Sep 4, 8:51 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 39 min |
| Sep 4, 9:07 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Milwaukee, Ozaukee, Racine, Walworth, Washington and 1 more | 83 min |
| Sep 4, 10:10 PM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 65 min |
| Sep 4, 10:42 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Winneshiek | 33 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 8.5 hours before the alert went out and 186 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1446 J/kg
- Mixed-layer CIN
- -171 J/kg
- Mixed-layer LCL
- 1471 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 172 m²/s²
- 0-3 km storm-relative helicity
- 221 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 1:33 PM CDT | Mesoscale Discussion | SPC | Allamakee, Bremer, Chickasaw, Clayton, Delaware, Fayette and 2 more | 117 min |
| Sep 4, 5:08 PM CDT | Mesoscale Discussion | SPC | Harrison, Monona | 97 min |
| Sep 4, 6:39 PM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Butler, Chickasaw and 9 more | 66 min |
Nearby
Severe Thunderstorm Watches in Wisconsin, 2012Severe Thunderstorm Watches in Iowa, 2012Severe Thunderstorm Watches in Minnesota, 2012Every severe thunderstorm watch in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.