

000 

WWUS20 KWNS 271931

SEL5

SPC WW 271931

MNZ000-NDZ000-280300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 655

NWS STORM PREDICTION CENTER NORMAN OK

230 PM CDT MON AUG 27 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN MINNESOTA

       SOUTH CENTRAL AND SOUTHEASTERN NORTH DAKOTA



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 230 PM UNTIL

1000 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 65 MILES WEST

SOUTHWEST OF JAMESTOWN NORTH DAKOTA TO 70 MILES NORTHEAST OF

BRAINERD MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...ELEVATED THUNDERSTORMS CONTINUE TO INCREASE ALONG NRN

EDGE OF STRONG MUCAPE AXIS INVOF H85 SURFACE FRONT FROM SRN ND INTO

NWRN MN EARLY THIS AFTERNOON.  18Z SOUNDINGS INDICATE SUBSTANTIAL

CAP TO SURFACE BASED PARCELS...BUT VERY STEEP MID LEVEL LAPSE RATES.

 THIS WILL CONTINUE TO FUEL INTENSE UPDRAFTS WITHIN AREA OF DEEP

ASCENT.  LARGE HAIL WILL BE PRIMARY SEVERE THREAT AS STORMS INCREASE

IN BOTH COVERAGE AND INTENSITY THROUGH THE AFTERNOON/EARLY

EVENING... ALTHOUGH AN ISOLATED STRONG TO DAMAGING DOWNDRAFT MAY

ALSO OCCUR.



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 24020.





...EVANS

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