SEL7
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 737
   NWS STORM PREDICTION CENTER NORMAN OK
   115 PM EDT SAT AUG 20 2005
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHERN AND EASTERN INDIANA
          NORTHERN KENTUCKY
          OHIO
          LAKE ERIE
   
   EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 115 PM UNTIL
   700 PM EDT.
   
   HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 100
   STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF
   CLEVELAND OHIO TO 40 MILES WEST SOUTHWEST OF LOUISVILLE KENTUCKY. 
   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.
   
   DISCUSSION...THUNDERSTORMS ARE DEVELOPING ALONG BOUNDARY FROM
   EXTREME NERN INDIANA INTO SWRN INDIANA IN ADVANCE OF VIGOROUS UPPER
   TROUGH MOVING TOWARD THE GREAT LAKES.  AIRMASS IS VERY MOIST AND
   UNSTABLE WITH MLCAPE VALUES IN THE 2500-3500 J/KG RANGE...AND
   ADDITIONAL DESTABILIZATION IS POSSIBLE AS STRONG HEATING OCCURS THIS
   AFTERNOON.  MODERATELY STRONG UNIDIRECTIONAL MID LEVEL WINDS OF
   35-50 KT AND LARGE DCAPE WILL PROMOTE DEVELOPMENT OF BOWING LINE
   SEGMENTS WITH POTENTIAL FOR WIDESPREAD DAMAGING WINDS.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
   MOTION VECTOR 25035.
   
   
   ...WEISS