

000 

WWUS20 KWNS 311217

SEL1

SPC WW 311217

IAZ000-MNZ000-WIZ000-311700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 781

NWS STORM PREDICTION CENTER NORMAN OK

720 AM CDT THU JUL 31 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN IOWA

       SOUTHERN MN MINNESOTA

       SOUTHWEST WI WISCONSIN



EFFECTIVE THIS THURSDAY MORNING FROM 720 AM UNTIL NOON 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 65

STATUTE MILES EITHER SIDE OF A LINE FROM 25 MILES NORTH NORTHWEST

OF FAIRMONT MINNESOTA TO 75 MILES SOUTH SOUTHEAST OF LA CROSSE

WISCONSIN.  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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 780. WATCH NUMBER 780 WILL NOT

BE IN EFFECT AFTER 720 AM CDT. CONTINUE...WW 779...



DISCUSSION...SEVERE MCS/BOW ECHO WITH HISTORY OF WIND DAMAGE WILL

CONTINUE TO QUICKLY SPREAD SOUTHEASTWARD THROUGH THE MORNING ACROSS

SOUTHERN MN INTO SOUTHWEST WI...WITH ADDITIONAL DEVELOPMENT LIKELY

INTO NORTHERN IA. POTENTIAL WILL EXIST FOR WIDESPREAD DAMAGING WINDS

AND SEVERE HAIL THROUGH THE MORNING.



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 500. MEAN STORM

MOTION VECTOR 30040.





...EVANS/GUYER

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