Alert archive / Wisconsin / Tornado Watches in 2011
Tornado Watch 532
The Storm Prediction Center issued this tornado watch at Jun 21, 2011, 2:11 PM CDT for 13 counties in Minnesota; 28 counties in Wisconsin. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 21, 2011, 2:11 PM CDT (19:11 UTC)
- Expired
- Jun 21, 2011, 9:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 41 counties
Anoka County, MN, Chisago County, MN, Dakota County, MN, Goodhue County, MN, Hennepin County, MN, Houston County, MN, Isanti County, MN, Ramsey County, MN, Sherburne County, MN, Wabasha County, MN, Washington County, MN, Winona County, MN, Wright County, MN, Adams County, WI, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Columbia County, WI, Dane County, WI, Dodge County, WI, Dunn County, WI, Eau Claire County, WI, Green Lake County, WI, Iowa County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, La Crosse County, WI, Marquette County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Richland County, WI, Rusk County, WI, Saint Croix County, WI, Sauk County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI
The radar
The La Crosse radar (KARX), 90 km from the middle of the area, began a volume at 19:10 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 2:21 PM CDT | Tornado Warning | MPX | Dakota, Washington | 24 min |
| Jun 21, 2:42 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Jefferson, Walworth, Washington, Waukesha | 33 min |
| Jun 21, 2:45 PM CDT | Tornado Warning | MKX | Marquette | 30 min |
| Jun 21, 3:06 PM CDT | Tornado Warning | MKX | Green Lake, Marquette | 24 min |
| Jun 21, 3:09 PM CDT | Tornado Warning | ARX | Wabasha | 48 min |
| Jun 21, 3:10 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Milwaukee, Ozaukee, Washington, Waukesha | 50 min |
| Jun 21, 3:13 PM CDT | Tornado Warning | MPX | Anoka, Hennepin, Ramsey | 32 min |
| Jun 21, 3:14 PM CDT | Tornado Warning | MKX | Dodge, Fond du Lac, Green Lake | 31 min |
| Jun 21, 3:27 PM CDT | Tornado Warning | MKX | Green Lake, Marquette | 33 min |
| Jun 21, 3:44 PM CDT | Tornado Warning | MKX | Fond du Lac, Green Lake | 31 min |
| Jun 21, 3:59 PM CDT | Tornado Warning | MKX | Green Lake | 31 min |
| Jun 21, 7:20 PM CDT | Severe Thunderstorm Warning | MKX | Dane | 16 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, 7.2 hours before the alert went out and 149 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 629 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 316 m²/s²
- 0-3 km storm-relative helicity
- 260 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
054
WWUS20 KWNS 211911
SEL2
SPC WW 211911
MNZ000-WIZ000-220200-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 532
NWS STORM PREDICTION CENTER NORMAN OK
215 PM CDT TUE JUN 21 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
PARTS OF SOUTHEASTERN MINNESOTA
PARTS OF SOUTHERN AND WESTERN WISCONSIN
EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 215 PM UNTIL
900 PM CDT.
TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH NORTHEAST OF
MINNEAPOLIS MINNESOTA TO 20 MILES SOUTH SOUTHWEST OF MADISON
WISCONSIN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 531...
DISCUSSION...BANDS OF THUNDERSTORMS WILL ROTATE ACROSS THE WATCH AS
THE UPPER LOW OVER NWRN IA MOVES SLOWLY E. LOW LEVEL SHEAR
ENVIRONMENT VERY FAVORABLE FOR LOW TOPPED SUPERCELLS. TORNADOES WILL
BE POSSIBLE WITH ANY SUPERCELLS AS ACTIVITY SLOWLY MOVES E ACROSS
THE WATCH.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
400. MEAN STORM MOTION VECTOR 18030.
...HALESSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 7:46 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Carroll, Cass, Crawford and 12 more | 59 min |
| Jun 20, 9:02 PM CDT | Mesoscale Discussion | SPC | Audubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 21 more | 58 min |
| Jun 20, 10:22 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Black Hawk, Boone, Bremer, Buchanan and 48 more | 83 min |
| Jun 20, 10:58 PM CDT | Tornado Watch | SPC | Appanoose, Black Hawk, Bremer, Butler, Cerro Gordo, Davis and 17 more | 4 hr |
| Jun 21, 1:25 AM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Bremer, Buchanan, Butler, Chickasaw and 14 more | 35 min |
| Jun 21, 11:45 AM CDT | Mesoscale Discussion | SPC | Allamakee, Clayton, Clinton, Delaware, Dubuque, Fayette and 5 more | 3 hr |
| Jun 21, 5:42 PM CDT | Severe Thunderstorm Watch | SPC | Green, Kenosha, Milwaukee, Racine, Rock, Walworth and 1 more | 4 hr |
Nearby
Tornado Watches in Wisconsin, 2011Tornado Watches in Minnesota, 2011Every tornado 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.