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Severe Thunderstorm Watch 662
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WW0662 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 662
   NWS STORM PREDICTION CENTER NORMAN OK
   850 PM CDT SUN JUL 6 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHWEST AND SOUTH CENTRAL NEBRASKA
   
   EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 850 PM UNTIL
   300 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 45
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST
   NORTHWEST OF IMPERIAL NEBRASKA TO GRAND ISLAND NEBRASKA.  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 660...WW 661...
   
   DISCUSSION...THE INTERACTION OF MERGING OUTFLOWS AND A STALLED FRONT
   ACROSS SRN NEB WILL SUPPORT ADDITIONAL THUNDERSTORM DEVELOP THROUGH
   THE OVERNIGHT HOURS.  THUNDERSTORM COVERAGE/INTENSITY WILL BE AIDED
   BY THE APPROACH OF A WEAK SHORTWAVE TROUGH FROM THE SW AND WARM
   ADVECTION ON THE NOSE OF A DEVELOPING LLJ IN KS.  MODERATE
   INSTABILITY AND EFFECTIVE BULK SHEAR OF 35-40 KT ON THE COOL SIDE OF
   THE STALLED FRONT SHOULD BE SUFFICIENT FOR ORGANIZED STORM
   CLUSTERS...AND PERHAPS SUPERCELLS.  LARGE HAIL AND DAMAGING WINDS
   WILL BE THE MAIN THREATS...THOUGH AN ISOLATED TORNADO CANNOT BE
   RULED OUT GIVEN THE MOIST BOUNDARY LAYER AND POTENTIAL FOR A FEW
   STORM/BOUNDARY INTERACTIONS.
   
   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 24015.
   
   
   ...THOMPSON
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Page last modified: July 07, 2008
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