

918 

WWUS20 KWNS 030438

SEL1

SPC WW 030438

IAZ000-MNZ000-WIZ000-031100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 651

NWS STORM PREDICTION CENTER NORMAN OK

1140 PM CDT SUN AUG 2 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHERN IOWA

       PARTS OF SOUTHEAST MINNESOTA

       PARTS OF CENTRAL AND SOUTHWESTERN WISCONSIN



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1140 PM UNTIL

600 AM CDT.



HAIL TO 2 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTHEAST

OF MOSINEE WISCONSIN TO 25 MILES SOUTH OF SPENCER IOWA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU1).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 649...WW 650...



DISCUSSION...STRONG/SEVERE THUNDERSTORMS CONTINUE TO DEVELOP ACROSS

NWRN IA INTO SRN MN IN STRONG MOISTURE AND INSTABILITY ADVECTION

AHEAD OF S/WV TROUGH FROM THE W.  AT LEAST AN ELEVATED LARGE HAIL

CONCERN WILL SPREAD EWD ACROSS THE WATCH WITH POTENTIAL FOR SHORT

LINE SEGMENTS DEVELOPING ALONG WITH DAMAGING WINDS.



AVIATION...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 27035.





...HALES

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