

000 

WWUS20 KWNS 280922

SEL8

SPC WW 280922

MIZ000-WIZ000-LMZ000-281400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 658

NWS STORM PREDICTION CENTER NORMAN OK

415 AM CDT TUE AUG 28 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       A SMALL PART OF UPPER MICHIGAN

       NORTH CENTRAL AND NORTHEAST WISCONSIN

       LAKE MICHIGAN



EFFECTIVE THIS TUESDAY MORNING FROM 415 AM UNTIL 900 AM 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 40

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

NORTHWEST OF WAUSAU WISCONSIN TO 45 MILES SOUTHEAST OF IRON

MOUNTAIN MICHIGAN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 657...



DISCUSSION...SMALL MCS NOW OVER W CNTRL WI EXPECTED TO CONTINUE ENE.

SYSTEM SHOULD GRADUALLY WEAKEN AS IT ENCOUNTERS LESS UNSTABLE LOW

LVL ENVIRONMENT.  HOWEVER...WIND PROFILES REMAIN FAVORABLE FOR STORM

ORGANIZATION AND...POTENTIALLY...LOCALLY DAMAGING WIND.  IN

ADDITION...SYSTEM APPEARS TO BE SUPPORTED BY LARGER SCALE SHORTWAVE

IMPULSE THAT IS ENHANCING WAA AHEAD OF MCS INTO NE WI.  COMBINATION

OF EXISTING MCS WITH WAA STORMS TO ITS EAST WILL POSE A THREAT FOR

LOCALLY DAMAGING WIND/MARGINALLY SVR HAIL EWD INTO N CNTRL AND

POSSIBLY NE WI.



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 500. MEAN STORM MOTION

VECTOR 25040.





...CORFIDI

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