SEL8
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 708
   NWS STORM PREDICTION CENTER NORMAN OK
   255 PM EDT WED AUG 4 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          WESTERN AND CENTRAL MARYLAND
          CENTRAL PENNSYLVANIA
          EXTREME NORTHERN VIRGINIA
          EASTERN WEST VIRGINIA PANHANDLE
   
   EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 255 PM UNTIL
   900 PM EDT.
   
   HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 80 STATUTE MILES
   EAST AND WEST OF A LINE FROM 70 MILES NORTH OF HARRISBURG
   PENNSYLVANIA TO 55 MILES WEST SOUTHWEST OF MARTINSBURG 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.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 706...WW 707...
   
   DISCUSSION...LINE OF SEVERE STORMS OVER WESTERN PA IS EXPECTED TO
   MAINTAIN INTENSITY AS IT CROSSES THE MOUNTAINS INTO CENTRAL
   PA/EASTERN WV PANHANDLE/WESTERN MD.  MOIST/UNSTABLE AIRMASS AND
   SUFFICIENT WESTERLY MID LEVEL WINDS SUGGEST A CONTINUED THREAT OF
   DAMAGING WINDS AND LARGE HAIL WITH STRONGER CELLS.
   
   AVIATION...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 500. MEAN STORM
   MOTION VECTOR 27035.
   
   
   ...HART