SEL7
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 487
   NWS STORM PREDICTION CENTER NORMAN OK
   145 PM EDT THU JUN 17 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          EASTERN OHIO
          MUCH OF PENNSYLVANIA
          NORTHERN WEST VIRGINIA PANHANDLE
   
   EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 145 PM UNTIL
   800 PM EDT.
   
   HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 120 STATUTE MILES
   EAST AND WEST OF A LINE FROM 50 MILES NORTH OF WILLIAMSPORT
   PENNSYLVANIA TO 40 MILES SOUTHEAST OF WHEELING WEST VIRGINIA.
   
   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...WITH A TROPICAL AND VERY UNSTABLE AIR MASS ACROSS
   AREA...ALONG WITH 30KT OF FLOW...THUNDERSTORMS EXPECTED TO BECOME
   ORGANIZED INTO SHORT LINES AND CLUSTERS THIS AFTERNOON INCREASING
   WIND DAMAGE POTENTIAL
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
   A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION
   VECTOR 27030.
   
   
   ...HALES