Tornado Watch 120

Issued

Apr 10, 2011, 3:19 PM CDT (20:19 UTC)

Expired

Apr 10, 2011, 10:26 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Particularly dangerous situation

Yes

Largest hail expected

4 in

Strongest gust expected

60 kt

The La Crosse radar (KARX), 167 km from the middle of the area, began a volume at 20:19 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.

Two or more tornadoes

90%

One or more EF2 to EF5 tornadoes

60%

Ten or more severe wind reports

80%

One or more gusts of 65 knots or more

60%

Ten or more severe hail reports

95%

One or more hailstones of 2 inches or more

80%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 396Apr 10, 1:30 PM CDT
• Mesoscale Discussion 399Apr 10, 6:02 PM CDT
• Mesoscale Discussion 402Apr 10, 8:55 PM CDT

708 
WWUS20 KWNS 102022
SEL0
SPC WW 102022
IAZ000-MIZ000-MNZ000-WIZ000-LSZ000-110400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 120
NWS STORM PREDICTION CENTER NORMAN OK
320 PM CDT SUN APR 10 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

       PARTS OF NORTHEAST IOWA
       PARTS OF WESTERN NORTHERN MICHIGAN
       SMALL PART OF SOUTHEAST MINNESOTA
       MUCH OF WISCONSIN
       LAKE SUPERIOR

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 320 PM UNTIL
1100 PM CDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

DESTRUCTIVE TORNADOES...LARGE HAIL TO 4 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 105 STATUTE
MILES EAST AND WEST OF A LINE FROM 5 MILES NORTH NORTHWEST OF
IRONWOOD MICHIGAN TO 45 MILES SOUTH OF CAMP DOUGLAS WISCONSIN.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).

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.

DISCUSSION...RAPID DEVELOPMENT OF SEVERE SUPERCELL THUNDERSTORMS
IMMINENT ALONG THE COLD FRONT FROM WI/MN BORDER INTO NERN IA.  AIR
MASS HAS DESTABILIZED AHEAD OF FRONT WITH MLCAPES TO 2000
J/KG...COUPLED WITH A VERY INTENSE WIND FIELD WILL LEAD TO POTENTIAL
OF BOTH VERY LARGE HAIL AND TORNADOS  WITH ANY SUPERCELL.  THERE IS
THE THREAT OF LONG LIVED SUPERCELLS ALONG WITH STRONG/DAMAGING
TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24050.


...HALES

Tornado Watches in Wisconsin, 2011Tornado Watches in Iowa, 2011Tornado Watches in Minnesota, 2011Every tornado watch in 2011

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.