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000 

WWUS20 KWNS 241924

SEL7

SPC WW 241924

MIZ000-WIZ000-LMZ000-LSZ000-250200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 297

NWS STORM PREDICTION CENTER NORMAN OK

225 PM CDT THU MAY 24 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       UPPER MICHIGAN

       CENTRAL AND NORTHEAST WISCONSIN

       LAKE MICHIGAN

       LAKE SUPERIOR



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 225 PM UNTIL

900 PM CDT.



HAIL TO 1 INCH 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 65

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH OF

MARQUETTE MICHIGAN TO 25 MILES WEST SOUTHWEST OF OSHKOSH

WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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...LINE OF THUNDERSTORMS WITH EMBEDDED SMALL BOWING

SEGMENTS WILL TRACK RAPIDLY NORTHEASTWARD ACROSS PARTS OF WI AND

UPPER MI THIS AFTERNOON AND EVENING.  STRONG AND INCREASING LOW/MID

LEVEL WIND FIELDS... STEEP LOW LEVEL LAPSE RATES...AND SUFFICIENT

MLCAPE VALUES WILL PROMOTE A RISK OF LOCALLY DAMAGING WINDS IN

STRONGER CELLS.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM MOTION

VECTOR 23045.





...HART

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