Alert archive / Wisconsin / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 677
The Storm Prediction Center issued this severe thunderstorm watch at Jul 23, 2011, 10:14 AM CDT for Allamakee County, Howard County, Winneshiek County, Iowa; 7 counties in Minnesota; 10 counties in Wisconsin. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 23, 2011, 10:14 AM CDT (15:14 UTC)
- Expired
- Jul 23, 2011, 2:00 PM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Allamakee County, IA, Howard County, IA, Winneshiek County, IA, Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Adams County, WI, Buffalo County, WI, Crawford County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Richland County, WI, Trempealeau County, WI, Vernon County, WI
The radar
The La Crosse radar (KARX), 37 km from the middle of the area, began a volume at 15:14 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
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 11:03 AM CDT | Severe Thunderstorm Warning | ARX | Fillmore, Olmsted, Winona | 42 min |
| Jul 23, 11:38 AM CDT | Severe Thunderstorm Warning | ARX | Houston, Winona | 52 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, 3.2 hours before the alert went out and 195 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
- 1467 J/kg
- Mixed-layer CIN
- -142 J/kg
- Mixed-layer LCL
- 875 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 175 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 4.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 7:38 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Bremer, Buchanan, Butler, Cedar and 19 more | 97 min |
| Jul 23, 1:10 PM CDT | Mesoscale Discussion | SPC | Allamakee, Winneshiek | 65 min |
| Jul 23, 1:52 PM CDT | Mesoscale Discussion | SPC | Clay, Dickinson, Emmet, Hancock, Kossuth, Lyon and 6 more | 83 min |
| Jul 23, 4:57 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Cass, Clarke, Dallas and 26 more | 93 min |
| Jul 23, 5:16 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Cass, Clarke, Davis and 25 more | 4 hr |
| Jul 22, 10:11 PM CDT | Mesoscale Discussion | SPC | Becker, Clay, Grant, Norman, Otter Tail, Wilkin | 64 min |
| Jul 22, 10:15 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Clay, Clearwater, Grant, Hubbard, Mahnomen and 6 more | 7 hr |
| Jul 23, 1:25 AM CDT | Mesoscale Discussion | SPC | Becker, Big Stone, Clay, Clearwater, Douglas, Grant and 13 more | 35 min |
| Jul 23, 1:41 AM CDT | Severe Thunderstorm Watch | SPC | Becker, Benton, Big Stone, Chippewa, Douglas, Grant and 20 more | 5 hr |
| Jul 23, 4:38 AM CDT | Mesoscale Discussion | SPC | Aitkin, Anoka, Becker, Benton, Big Stone, Carver and 36 more | 67 min |
| Jul 23, 9:37 AM CDT | Mesoscale Discussion | SPC | Fillmore, Houston, Olmsted, Wabasha, Winona | 53 min |
| Jul 23, 5:26 PM CDT | Mesoscale Discussion | SPC | Adams, Clark, Eau Claire, Jackson, Juneau, Marathon and 9 more | 64 min |
| Jul 23, 6:36 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Clark, Columbia, Dane, Dodge, Fond du Lac and 19 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Wisconsin, 2011Severe Thunderstorm Watches in Minnesota, 2011Severe Thunderstorm Watches in Iowa, 2011Every severe thunderstorm watch in 2011
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.