Tornado Watch 481

Issued

Jul 3, 2007, 6:08 PM CDT (23:08 UTC)

Expired

Jul 4, 2007, 12:00 AM CDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The La Crosse radar (KARX), 55 km from the middle of the area, began a volume at 23:07 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

50%

One or more EF2 to EF5 tornadoes

30%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1370Jul 3, 4:32 PM CDT
• Mesoscale Discussion 1371Jul 3, 5:50 PM CDT
• Mesoscale Discussion 1375Jul 3, 10:24 PM CDT

000
WWUS20 KWNS 032309
SEL1  
SPC WW 032309
IAZ000-ILZ000-MNZ000-WIZ000-040500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 481
NWS STORM PREDICTION CENTER NORMAN OK
610 PM CDT TUE JUL 3 2007

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

       NORTHEASTERN IOWA
       FAR NORTHWEST ILLINOIS
       SOUTHEAST MINNESOTA
       WESTERN INTO SOUTH CENTRAL WISCONSIN

EFFECTIVE THIS TUESDAY NIGHT FROM 610 PM UNTIL MIDNIGHT CDT.

TORNADOES...HAIL TO 2 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 NORTH AND SOUTH OF A LINE FROM 55 MILES NORTHWEST OF
WATERLOO IOWA TO 15 MILES NORTH NORTHEAST OF MADISON WISCONSIN. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).

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 477...WW 478...WW
479...WW 480...

DISCUSSION...SHEAR PROFILES CONTINUE TO INCREASE ACROSS THIS REGION
AS NWLY MID LEVEL JET INVOF VORT MAX MOVING ACROSS THE NRN MS RIVER
VALLEY OVERSPREADS THE AREA.  ASSOCIATED SWLY LLJ IS ALSO FORECAST
TO INCREASE THROUGH THE EVENING...FURTHER BOOSTING LOW AND DEEP
LAYER SHEAR PROFILES.  GIVEN MODERATE TO STRONG INSTABILITY IN
PLACE...SUPERCELLS WITH ATTENDANT THREAT OF ISOLATED TORNADOES ARE
EXPECTED.  LARGE HAIL AND DAMAGING WINDS WILL BE ADDITIONAL HAZARDS
WITH STORMS THROUGH THE EVENING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 30025.


...EVANS

Tornado Watches in Wisconsin, 2007Tornado Watches in Iowa, 2007Tornado Watches in Minnesota, 2007Every tornado watch in 2007

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.