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Severe Thunderstorm Watch 746
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WW0746 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL6
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 746
   NWS STORM PREDICTION CENTER NORMAN OK
   305 PM CDT THU JUL 24 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          PARTS OF SOUTHEAST MONTANA
          PARTS OF NORTHERN NEBRASKA
          PARTS OF WESTERN AND SOUTHERN SOUTH DAKOTA
          PARTS OF NORTHEAST WYOMING
   
   EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 305 PM UNTIL
   1000 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 NORTH AND SOUTH OF A LINE FROM 25 MILES WEST
   NORTHWEST OF GILLETTE WYOMING TO 65 MILES SOUTH SOUTHEAST OF
   CHAMBERLAIN SOUTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH
   SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).
   
   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 744...WW 745...
   
   DISCUSSION...AIRMASS HAS DESTABILIZED WITH LITTLE REMAINING CINH
   ACROSS THE WATCH AREA.  WITH STEEP LAPSE RATES AND 30-40KT OF DEEP
   LAYER SHEAR...SEVERE THUNDERSTORMS EXPECTED TO DEVELOP VICINITY OF
   LOW LEVEL BOUNDARIES AND EWD OFF THE HIGHER TERRAIN.  LARGE HAIL AND
   DAMAGING DOWNBURSTS WINDS ARE LIKELY WITH POTENTIAL FOR A FEW
   SUPERCELLS THAT WILL ENHANCE SEVERE THREAT.
   
   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 550. MEAN STORM
   MOTION VECTOR 29020.
   
   
   ...HALES
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