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000 

WWUS20 KWNS 182103

SEL3

SPC WW 182103

MNZ000-WIZ000-190300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 533

NWS STORM PREDICTION CENTER NORMAN OK

400 PM CDT WED JUL 18 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST MINNESOTA

       WESTERN WISCONSIN



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 400 PM UNTIL

1000 PM 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES EAST

SOUTHEAST OF EAU CLAIRE WISCONSIN TO 25 MILES NORTH OF MANKATO

MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 529...WW 530...WW

531...WW 532...



DISCUSSION...TSTMS DEVELOPING RAPIDLY ALONG WIND SHIFT BOUNDARY

DEVELOPING SWD INTO VERY UNSTABLE AIR MASS ACROSS SRN MN/WRN WI.

INCREASINGLY STRONG ASCENT FROM MCV...AND LARGE SCALE HEIGHT FALLS

ASSOCIATED WITH MID/UPPER IMPULSE DEVELOPING SEWD FROM NRN

NM/WI...SHOULD CONTINUE TO AID STRONG TO SEVERE STORM DEVELOPMENT

INTO THIS EVENING. SHEAR AND INSTABILITY VALUES WILL SUPPORT

ROTATING STORMS/SUPERCELLS WITH LARGE HAIL AND HIGH WINDS LIKELY

FROM THE MORE INTENSE AND LONGER-LIVED CELLS.



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 32025.





...CARBIN/WEISS

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