WATCHES: Tornado Watch Number 412

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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