Alert archive / Wisconsin / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 712
The Storm Prediction Center issued this severe thunderstorm watch at Aug 1, 2011, 2:04 PM CDT for 4 counties in Iowa; 7 counties in Minnesota; 9 counties in Wisconsin. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 1, 2011, 2:04 PM CDT (19:04 UTC)
- Expired
- Aug 1, 2011, 6:53 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Allamakee County, IA, Howard County, IA, Mitchell 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, Buffalo County, WI, Clark County, WI, Crawford County, WI, Jackson 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), 72 km from the middle of the area, began a volume at 19:04 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
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
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, 7.1 hours before the alert went out and 159 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
- 2974 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 898 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 1:50 PM CDT | Mesoscale Discussion | SPC | Allamakee, Chickasaw, Clayton, Fayette, Howard, Mitchell and 1 more | 25 min |
| Aug 1, 3:53 PM CDT | Mesoscale Discussion | SPC | Allamakee, Chickasaw, Howard, Mitchell, Winneshiek, Worth | 67 min |
| Jul 31, 10:26 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Clay, Clearwater, Grant, Kittson, Mahnomen and 8 more | 8 hr |
| Aug 1, 12:35 AM CDT | Mesoscale Discussion | SPC | Clay, Norman, Polk | 85 min |
| Aug 1, 2:31 AM CDT | Mesoscale Discussion | SPC | Becker, Cass, Clay, Clearwater, Crow Wing, Douglas and 11 more | 89 min |
| Aug 1, 4:57 AM CDT | Severe Thunderstorm Watch | SPC | Becker, Benton, Big Stone, Brown, Cass, Chippewa and 28 more | 7 hr |
| Aug 1, 7:31 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 33 more | 89 min |
| Aug 1, 10:42 AM CDT | Mesoscale Discussion | SPC | Benton, Kandiyohi, Meeker, Mille Lacs, Morrison, Pope and 5 more | 63 min |
| Aug 1, 11:29 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Carver, Chisago, Dakota, Hennepin and 8 more | 31 min |
| Aug 1, 11:52 AM CDT | Severe Thunderstorm Watch | SPC | Anoka, Becker, Benton, Big Stone, Blue Earth, Brown and 43 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.