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000 

WWUS20 KWNS 261901

SEL0

SPC WW 261901

NDZ000-270200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 610

NWS STORM PREDICTION CENTER NORMAN OK

200 PM CDT THU JUN 26 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL NORTH DAKOTA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 200 PM UNTIL

900 PM CDT.



HAIL TO 2.5 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 90

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH

NORTHWEST OF MINOT NORTH DAKOTA TO 65 MILES SOUTH SOUTHEAST OF

DICKINSON NORTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...A MID LEVEL TROUGH IS MOVING EWD OVER CENTRAL/ERN

MT...WITH LARGE SCALE ASCENT EXPECTED TO OVERSPREAD WRN ND THIS

AFTERNOON IN ADVANCE OF THIS TROUGH.  MEANWHILE...THE LOW LEVELS

CONTINUE TO WARM WITH DAYTIME HEATING...AND CONVECTIVE INHIBITION IS

WEAKENING.  THE NET RESULT WILL BE A GRADUAL INCREASE IN

THUNDERSTORM COVERAGE AND INTENSITY ACROSS WRN ND THIS AFTERNOON.

MODERATE INSTABILITY AND 0-6 KM SHEAR AROUND 40 KT WILL SUPPORT A

FEW SUPERCELLS CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WINDS.

THERE MAY BE AN INCREASE IN THE DAMAGING WIND THREAT LATER THIS

AFTERNOON IN CONJUNCTION WITH STORM MERGERS AND COLD POOL

DEVELOPMENT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 29025.





...THOMPSON

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