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597 

WWUS20 KWNS 130007

SEL9

SPC WW 130007

MIZ000-WIZ000-LMZ000-LSZ000-130500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 849

NWS STORM PREDICTION CENTER NORMAN OK

710 PM CDT MON SEP 12 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       UPPER MICHIGAN

       EXTREME NORTHERN WISCONSIN

       LAKE MICHIGAN

       LAKE SUPERIOR



EFFECTIVE THIS MONDAY NIGHT FROM 710 PM UNTIL MIDNIGHT 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 100

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

NORTHEAST OF MARQUETTE MICHIGAN TO 50 MILES WEST OF IRON MOUNTAIN

MICHIGAN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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...VIGOROUS PV MAX WILL CONTINUE A ESE TREK ACROSS THE

GREAT LAKES THIS EVENING.  STRONG UVV WILL SUPPORT/MAINTAIN BAND OF

STG-SVR TSTMS AS THEY CROSS UPR MI AND FAR NRN WI THROUGH LATE THIS

EVENING.  STRONG FORCING FOR ASCENT AND STRONG WIND FIELDS THROUGH

THE COLUMN WILL SUPPORT A FEW BOW ECHOES/EMBEDDED SUPERCELLS WITH

LARGE HAIL AND DMGG WIND GUSTS.



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.





...RACY

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