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Severe Thunderstorm Watch 582
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WW0582 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL2
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 582
   NWS STORM PREDICTION CENTER NORMAN OK
   340 PM CDT FRI AUG 10 2007
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTH CENTRAL NORTH DAKOTA
          NORTH CENTRAL SOUTH DAKOTA
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 340 PM UNTIL
   1000 PM 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 45
   STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH
   NORTHWEST OF JAMESTOWN NORTH DAKOTA TO 35 MILES SOUTH SOUTHWEST
   OF MOBRIDGE SOUTH 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.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 579...WW 580...WW 581...
   
   DISCUSSION...CONVECTION IS BEGINNING TO DEVELOP ALONG A NE-SW
   SURFACE BOUNDARY ACROSS SRN ND/NRN SD.  SURFACE OBSERVATIONS AND
   MODIFIED MODEL SOUNDINGS SUGGEST THAT THE CAP IS WEAKENING ALONG
   THIS CORRIDOR...AND THAT SUPERCELL DEVELOPMENT WILL BE POSSIBLE THE
   NEXT FEW HOURS GIVEN EFFECTIVE BULK SHEAR IN EXCESS OF 40 KT AND
   MLCAPE OF 1500-3000 J/KG.  TEMPERATURE-DEWPOINT SPREADS NEAR 30 F
   SUGGEST THAT THE TORNADO THREAT WILL BE LIMITED IN SD...WITH A
   SLIGHTLY GREATER THREAT FOR AN ISOLATED TORNADO ALONG THE FRONT IN
   ND.  STILL...LARGE HAIL AND DAMAGING WINDS WILL BE THE PRIMARY
   THREATS THROUGH THE EVENING.
   
   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 550. MEAN STORM
   MOTION VECTOR 26025.
   
   
   ...THOMPSON
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