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000 

WWUS20 KWNS 172211

SEL2

SPC WW 172211

MNZ000-NDZ000-180500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 412

NWS STORM PREDICTION CENTER NORMAN OK

510 PM CDT SUN JUN 17 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       FAR WEST CENTRAL MINNESOTA

       CENTRAL AND SOUTHEASTERN NORTH DAKOTA



EFFECTIVE THIS SUNDAY AFTERNOON FROM 510 PM UNTIL MIDNIGHT CDT.



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

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 105 STATUTE

MILES EAST AND WEST OF A LINE FROM 75 MILES SOUTH SOUTHWEST OF

JAMESTOWN NORTH DAKOTA TO 60 MILES NORTH NORTHEAST OF JAMESTOWN

NORTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 407...WW 408...WW

409...WW 410...WW 411...



DISCUSSION...SEVERE THUNDERSTORMS...INCLUDING A FEW SUPERCELLS...ARE

EXPECTED TO DEVELOP AHEAD OF STRONG SURFACE COLD FRONT AND LOW

CENTER NOW MOVING INTO CENTRAL ND.  AIR MASS IS MODERATE TO STRONGLY

UNSTABLE EARLY THIS EVENING WITH WEAKENING CAP.  DEEP LAYER SHEAR

REMAINS QUITE STRONG WITH EFFECTIVE SHEAR IN EXCESS OF 50 KT.  IN

ADDITION...LOW LEVEL SHEAR SHOULD FAVOR LOW LEVEL ROTATION AND THE

POTENTIAL FOR TORNADOES...AS WELL AS LARGE HAIL AND DAMAGING WINDS.



AVIATION...TORNADOES AND 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 24035.





...EVANS

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