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Severe Thunderstorm Watch 743
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WW0743 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL3
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 743
   NWS STORM PREDICTION CENTER NORMAN OK
   1045 PM CDT WED JUL 23 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          WESTERN IOWA
          NORTHEAST AND PARTS OF EASTERN NEBRASKA
          EXTREME SOUTHEAST SOUTH DAKOTA
   
   EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1045 PM
   UNTIL 600 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 65
   STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF
   YANKTON SOUTH DAKOTA TO 35 MILES SOUTH SOUTHEAST OF OMAHA
   NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
   
   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 741...WW 742...
   
   DISCUSSION...STORMS ARE FORECAST TO INCREASE ALONG EASTERN GRADIENT
   OF CENTRAL PLAINS INSTABILITY AXIS AS WEAK HEIGHT FALLS AND
   INCREASINGLY STRONG LOW LEVEL JET AID ASCENT ACROSS THE REGION.
   INFLOW AIR MASS IS STRONGLY UNSTABLE AND EFFECTIVE SHEAR OF 40-50KT
   WILL SUPPORT UPDRAFT ROTATION AND PERSISTENCE WITH THE STRONGER
   CELLS...GENERALLY ROOTED ABOVE 850MB. PRIMARY THREAT WITH THIS
   OVERNIGHT ACTIVITY SHOULD BE LARGE HAIL. GRADUAL UPSCALE EVOLUTION
   INTO A SMALL/COMPACT MCS WITH STRONG/DAMAGING WINDS IS POSSIBLE AS
   COLD POOL STRENGTHENS AND MESOSCALE FORCING/LIFT IS ENHANCED WITHIN
   STRONGLY UNSTABLE REGIME.
   
   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 29025.
   
   
   ...CARBIN
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Page last modified: July 24, 2008
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