

000 

WWUS20 KWNS 272320

SEL6

SPC WW 272320

MNZ000-WIZ000-LSZ000-280600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 656

NWS STORM PREDICTION CENTER NORMAN OK

620 PM CDT MON AUG 27 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST MINNESOTA

       EXTREME NORTHWEST WISCONSIN

       LAKE SUPERIOR



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 620 PM UNTIL

100 AM 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH

SOUTHWEST OF HIBBING MINNESOTA TO 50 MILES EAST OF SILVER BAY

MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 655...



DISCUSSION...DESTABILIZATION ABOVE THE GROUND WILL HELP MAINTAIN A

CLUSTER OF ELEVATED THUNDERSTORMS SPREADING EWD TOWARD NE MN.  STEEP

MID LEVEL LAPSE RATES...MUCAPE NEAR 2000 J/KG...AND EFFECTIVE BULK

SHEAR IN EXCESS OF 50 KT WILL CONTINUE TO SUPPORT SUPERCELL

STRUCTURES WITH A PRIMARY SEVERE THREAT OF LARGE HAIL.  ISOLATED

DAMAGING GUSTS MAY ALSO REACH THE SURFACE IN THE MORE INTENSE

PRECIPITATION CORES.



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 26025.





...THOMPSON

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