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000 

WWUS20 KWNS 140249

SEL5

SPC WW 140249

IAZ000-MNZ000-WIZ000-140900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 595

NWS STORM PREDICTION CENTER NORMAN OK

945 PM CDT MON AUG 13 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST IOWA

       SOUTHEAST MINNESOTA

       SOUTHWEST AND CENTRAL WISCONSIN



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 945 PM UNTIL

400 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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 50 MILES NORTHWEST OF

WATERLOO IOWA TO 45 MILES NORTHEAST OF CAMP DOUGLAS WISCONSIN.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 594...



DISCUSSION...ORGANIZING DERECHO IS RACING SEWD AT ROUGHLY 45 KT

ACROSS ECNTRL MN INTO WCNTRL WI.  THIS ACTIVITY SHOULD CONTINUE

PROPAGATING ALONG AN AXIS ORIENTED TO THE MS RIVER...NOT TOO

DISSIMILAR TO THE WARM FRONTAL BOUNDARY WHERE SUSTAINED WARM

ADVECTION WILL ASSIST DEEP CONVECTION.  ADDITIONAL UPSTREAM

DEVELOPMENT TO THE WEST OF MSP WILL SURGE INTO PORTIONS OF NERN IA

BY 0530Z.  DAMAGING WINDS ARE LIKELY WITH THIS ACTIVITY.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 29040.





...DARROW

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