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000 

WWUS20 KWNS 211949

SEL9

SPC WW 211949

MIZ000-WIZ000-LSZ000-220400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 679

NWS STORM PREDICTION CENTER NORMAN OK

250 PM CDT FRI SEP 21 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN PORTIONS OF UPPER MICHIGAN

       LARGE PART OF NORTHERN AND CENTRAL WISCONSIN

       LAKE SUPERIOR



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 250 PM UNTIL

1100 PM CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES WEST NORTHWEST OF

HOUGHTON MICHIGAN TO 35 MILES EAST OF CAMP DOUGLAS WISCONSIN.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



DISCUSSION...VERY STRONG S/WV TROUGH AND ASSOCIATED WIND FIELDS

SUPPORTS RAPID DEVELOPMENT OF SEVERE THUNDERSTORMS ALONG/AHEAD OF

COLD FRONT NOW MOVING INTO WRN WI.  WITH STRONG/VEERING SHEAR

PROFILES AND MLCAPES TO 1500 J/KG...SUPERCELLS ARE LIKELY

ALONG/AHEAD OF THE FRONT.  STORMS WILL QUICKLY EVOLVE INTO A SQUALL

LINE WITH AN ENHANCED WIND DAMAGE POTENTIAL SPREADING EWD ACROSS THE

WATCH DURING THE EVENING.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24040.





...HALES

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