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762 

WWUS20 KWNS 191407

SEL2

SPC WW 191407

MNZ000-WIZ000-192000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 662

NWS STORM PREDICTION CENTER NORMAN OK

910 AM CDT TUE JUL 19 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EAST CENTRAL AND SOUTHEAST MINNESOTA

       NORTHWEST AND WEST CENTRAL WISCONSIN



EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 910 AM UNTIL

300 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 70 MILES NORTH

NORTHWEST OF MINNEAPOLIS MINNESOTA TO 60 MILES EAST SOUTHEAST OF

EAU CLAIRE WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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...PERSISTENT MCS MOVING ACROSS CENTRAL MN HAS DEVELOPED

SUPERCELL STRUCTURES ALONG ITS SRN FLANK.  THE ENVIRONMENT

DOWNSTREAM ALONG THE STALLED SURFACE FRONT REMAINS STRONGLY UNSTABLE

BASED ON THE 12Z MPX SOUNDING...WITH SUFFICIENT VERTICAL SHEAR TO

MAINTAIN AN ORGANIZED CLUSTER CAPABLE OF PRODUCING DAMAGING WINDS

AND LARGE HAIL FOR THE NEXT FEW HOURS.



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 650. MEAN STORM

MOTION VECTOR 31025.





...THOMPSON

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