

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

