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000 

WWUS20 KWNS 241950

SEL2

SPC WW 241950

NDZ000-250200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 602

NWS STORM PREDICTION CENTER NORMAN OK

250 PM CDT TUE JUN 24 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL NORTH DAKOTA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 250 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 85

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

MINOT NORTH DAKOTA TO 60 MILES SOUTH SOUTHEAST OF DICKINSON NORTH

DAKOTA.  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...PRONOUNCED MID LEVEL SHORTWAVE TROUGH IS MOVING EWD

FROM MT TOWARD NW ND...AND THE LOW LEVELS CONTINUE TO DESTABILIZE

ACROSS SW AND CENTRAL ND IN ADVANCE OF THE ASSOCIATED SURFACE COLD

FRONT.  THUNDERSTORMS WILL LIKELY CONTINUE TO DEVELOP/INTENSIFY AS

THEY SPREAD EWD FROM MT INTO ND...WITH AN INCREASING THREAT FOR

LARGE HAIL AND DAMAGING WINDS THROUGH THE EVENING.  LOCAL VWP/S AND

MODEL FORECAST SOUNDINGS SHOW SUFFICIENT VERTICAL SHEAR FOR

SUPERCELLS.  WHILE AN ISOLATED TORNADO CANNOT BE RULED OUT...A

RELATIVELY DRY BOUNDARY LAYER AND A TENDENCY FOR MORE LINEAR

CONVECTIVE STRUCTURES LATER THIS EVENING SUGGEST THAT LARGE HAIL AND

DAMAGING WINDS WILL BE THE PRIMARY SEVERE THREATS.



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 27030.





...THOMPSON

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