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Severe Thunderstorm Watch 769
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WW0769 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL9
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 769
   NWS STORM PREDICTION CENTER NORMAN OK
   955 PM CDT MON JUL 28 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          WESTERN MINNESOTA
          EASTERN NORTH DAKOTA
   
   EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 955 PM UNTIL
   400 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 55
   STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH
   NORTHEAST OF DEVILS LAKE NORTH DAKOTA TO 65 MILES SOUTH OF FARGO
   NORTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).
   
   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.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 767...WW 768...
   
   DISCUSSION...THUNDERSTORMS ARE INCREASING OVER CENTRAL ND IN REGION
   OF LOW LEVEL WARM ADVECTION...AHEAD OF APPROACHING UPPER TROUGH. 
   RATHER STEEP MID LEVEL LAPSE RATES AND SUFFICIENT INSTABILITY WILL
   MAINTAIN STORMS INTO THE OVERNIGHT HOURS...WHILE 40+ KNOT EFFECTIVE
   SHEAR VALUES PROMOTE SUPERCELL STORM STRUCTURES.  LARGE HAIL AND
   DAMAGING WINDS ARE EXPECTED TO BE THE MAIN THREATS.
   
   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 500. MEAN STORM
   MOTION VECTOR 27030.
   
   
   ...HART
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