

721 

WWUS20 KWNS 241538

SEL6

SPC WW 241538

IAZ000-MNZ000-WIZ000-242200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 616

NWS STORM PREDICTION CENTER NORMAN OK

1035 AM CDT FRI JUL 24 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF CENTRAL AND EASTERN IOWA

       PORTIONS OF SOUTH CENTRAL AND SOUTHEASTERN MINNESOTA

       FAR SOUTHWEST WISCONSIN



EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 1035 AM UNTIL

500 PM CDT.



HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85

STATUTE MILES EITHER SIDE OF A LINE FROM 30 MILES SOUTHWEST OF

FORT DODGE IOWA TO 35 MILES SOUTH SOUTHEAST OF LA CROSSE

WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...ONGOING/ELEVATED STORMS NOW OVER SOUTHEAST MINNESOTA

AND ADJACENT FAR WESTERN WISCONSIN SHOULD CONTINUE/INCREASE THROUGH

THE DAY WHILE MOVING SWD/SEWD...BECOMING INCREASINGLY SURFACE-BASED

WITH TIME IN CONJUNCTION WITH BOUNDARY-LAYER

HEATING/DESTABILIZATION.  WITH DEEP-LAYER WIND FIELD SUPPORTIVE OF

ORGANIZED/ROTATING STORMS...LARGE HAIL THREAT WILL CONTINUE.  IN

ADDITION...AN INCREASING THREAT FOR DAMAGING WINDS IS EXPECTED TO

EVOLVE WITH TIME AS STORMS BECOME MORE SURFACE-BASED THROUGH LATE

MORNING/EARLY AFTERNOON.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 33035.





...GOSS

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