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Severe Thunderstorm Watch 810
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WW0810 Radar
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   SEL0
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 810
   NWS STORM PREDICTION CENTER NORMAN OK
   300 PM CDT TUE AUG 5 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          CENTRAL AND SOUTHERN ILLINOIS
          SOUTHERN INDIANA
          WESTERN AND CENTRAL KENTUCKY
          EAST CENTRAL AND NORTHEAST MISSOURI
   
   EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 300 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 60
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES SOUTHWEST
   OF QUINCY ILLINOIS TO 80 MILES SOUTHEAST OF LOUISVILLE KENTUCKY. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU0).
   
   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.
   
   DISCUSSION...STORMS ARE EXPECTED TO CONTINUE DEVELOPING OVER PARTS
   OF EASTERN MO AND CENTRAL IL AS A COLD FRONT MOVES SEWD INTO A VERY
   UNSTABLE AIR MASS WITH MUCAPE OF 3500-4500 J/KG.  CLEARING SKIES TO
   THE NORTH OF AN EARLIER OUTFLOW BOUNDARY HAVE ALLOWED RAPID
   DESTABILIZATION INTO CENTRAL/SRN IL...AND NEW STORMS ARE EXPECTED TO
   DEVELOP ACROSS THIS AREA.  NWLY MID LEVEL WINDS HAVE INCREASED
   ACROSS THE MIDDLE MS VALLEY AS A JET STREAK MOVES ACROSS NRN IL
   WHICH WILL ENHANCE STORM ORGANIZATION AND INTENSITY.  DOWNSTREAM
   FROM THIS REGION...CLEARING SKIES AND DESTABILIZATION HAS OCCURRED
   IN PARTS OF KY AND STORMS OVER SERN IL AND SWRN INDIANA WILL MAY
   INTENSIFY AS THEY MOVE ESEWD TOWARD THE OH RIVER.  VAD WIND PROFILES
   EXHIBIT WNWLY FLOW OF 30-40 KT ABOVE 3-4 KM AGL INDICATING
   SUFFICIENT SHEAR TO SUPPORT A SEVERE THREAT ACROSS THIS REGION.
   
   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 28025.
   
   
   ...WEISS
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