

000 

WWUS20 KWNS 252316

SEL2

SPC WW 252316

MNZ000-NDZ000-260600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 552

NWS STORM PREDICTION CENTER NORMAN OK

615 PM CDT WED JUL 25 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHWEST MINNESOTA

       PARTS OF EASTERN NORTH DAKOTA



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 615 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 100

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

SOUTHEAST OF DEVILS LAKE NORTH DAKOTA TO 25 MILES WEST NORTHWEST

OF ROSEAU MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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...VERY WARM AND EXTREMELY UNSTABLE AIR MASS ACROSS WATCH

AREA AS COLD FRONT APPROACHES FROM THE WEST.  SEVERE THUNDERSTORMS

HAVE DEVELOPED SRN MANITOBA AND ARE EXPECTED TO CONTINUE EXPANDING

E/SEWD INTO THE VERY UNSTABLE AIR MASS.  PRIMARY THREAT WILL BE

LARGE HAIL AND DAMAGING DOWNBURSTS WITH MOST INTENSE STORMS.



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 600. MEAN STORM

MOTION VECTOR 27020.





...HALES

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