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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 611

NWS STORM PREDICTION CENTER NORMAN OK

305 PM CDT MON SEP 3 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       UPPER MICHIGAN MICHIGAN

       NORTHEAST WISCONSIN

       LAKE MICHIGAN

       LAKE SUPERIOR



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 305 PM UNTIL 900

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 70

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES EAST

SOUTHEAST OF MOSINEE WISCONSIN TO 80 MILES EAST NORTHEAST OF

MARQUETTE MICHIGAN.  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.



DISCUSSION...SEVERAL SMALL CLUSTERS OF SUSTAINED STORMS/SUPERCELLS

EXPECTED TO TRACK MAINLY E ACROSS NRN WI AND CNTRL/ERN UPR MI AHEAD

OF DISTURBANCE IN MODERATE...DEEP WSWLY MID/UPR LVL FLOW. WHILE

LOW-LVL FORCING WILL REMAIN WEAK...SFC HEATING AND STRENGTH OF DEEP

SHEAR EXPECTED TO SUPPORT CONTINUED STORM DEVELOPMENT/STORM SPLITS

IN AREAS UNAFFECTED BY PREVIOUS ACTIVITY. THE STORMS MAY YIELD DMGG

WIND AND SVR HAIL THROUGH EARLY EVE GIVEN FAIRLY STRONG UPDRAFT

STRENGTH AND LONGEVITY.



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 27030.





...CORFIDI

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