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Severe Thunderstorm Watch 227
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WW0227 Radar
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   SEL7
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 227
   NWS STORM PREDICTION CENTER NORMAN OK
   1020 PM CDT THU APR 24 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTH CENTRAL AND NORTHEAST KANSAS
          SOUTH CENTRAL AND SOUTHEAST NEBRASKA
   
   EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1020 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 60
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES SOUTH
   SOUTHWEST OF KEARNEY NEBRASKA TO 55 MILES EAST SOUTHEAST OF
   BEATRICE NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).
   
   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 226...
   
   DISCUSSION...ELEVATED CONVECTION WILL INCREASE ACROSS NE KS/SE NEB
   OVERNIGHT ON THE NOSE OF THE DEVELOPING LLJ IN KS.  A FEED OF
   MODERATE INSTABILITY /MUCAPE OF 1500-2000 J/KG/ WILL HELP SUSTAIN
   SLIGHTLY ELEVATED STORMS WITH A PRIMARY THREAT OF LARGE HAIL.  THERE
   WILL ALSO BE SOME POTENTIAL FOR CONVECTION TO GROW INTO A SMALL MCS
   OVERNIGHT WITH AN ATTENDANT THREAT FOR DAMAGING WINDS. 
   ADDITIONALLY...THE LONE SUPERCELL IN NRN KS MAY PERSIST FOR A FEW
   HOURS AS IT MOVES INTO AN INCREASINGLY MOIST AIR MASS.  THOUGH AN
   ISOLATED TORNADO CANNOT BE RULED OUT...THIS BOUNDARY LAYER AIR MASS
   IS ALSO COOL ENOUGH TO SUGGEST THAT ISOLATED VERY LARGE
   HAIL/DAMAGING WINDS WILL BE THE MAIN THREATS WITH THIS STORM.
   
   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 26025.
   
   
   ...THOMPSON
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