SEL5
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 735
   NWS STORM PREDICTION CENTER NORMAN OK
   405 PM EDT FRI AUG 19 2005
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          WESTERN NEW YORK
          NORTHWEST PENNSYLVANIA
          LAKE ERIE
          LAKE ONTARIO
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 405 PM UNTIL 1000
   PM EDT.
   
   TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
   GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
   AREAS.
   
   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE MILES
   EAST AND WEST OF A LINE FROM 35 MILES NORTH OF ROCHESTER NEW YORK
   TO 35 MILES SOUTH OF JAMESTOWN NEW YORK.  FOR A COMPLETE DEPICTION
   OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS
   WOU5).
   
   REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
   TORNADOES AND 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.
   
   DISCUSSION...THUNDERSTORMS ARE BEGINNING TO DEVELOP SWD ALONG
   PRE-FRONTAL BOUNDARY FROM SWRN ONTARIO INTO ERN LAKE ERIE IN
   RESPONSE TO INCREASING DYNAMIC FORCING FOR ASCENT IN ADVANCE OF
   UPPER SHORT WAVE MOVING ACROSS SWRN ONTARIO.  AIRMASS HAS
   DESTABILIZED ALONG THE SRN SHORE OF LAKE ONTARIO SSWWD INTO ERN OH
   AND WRN PA...AND CONTINUING SOUTHERLY WINDS NEAR THE SURFACE VEER
   MARKEDLY ABOVE THE BOUNDARY LAYER RESULTING IN STRONG VERTICAL SHEAR
   SUPPORTIVE OF SEVERE STORMS INCLUDING POSSIBLE TORNADOES.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   450. MEAN STORM MOTION VECTOR 26030.
   
   
   ...WEISS