SEL4
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 834
   NWS STORM PREDICTION CENTER NORMAN OK
   350 PM EDT FRI SEP 17 2004
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          NORTHERN MARYLAND
          FAR EASTERN WEST VIRGINIA PANHANDLE
          COASTAL WATERS
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 350 PM UNTIL 800
   PM EDT.
   
   TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
   TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE TORNADO WATCH AREA IS ALONG AND 65 STATUTE MILES EAST AND WEST
   OF A LINE FROM 40 MILES SOUTHEAST OF MARTINSBURG WEST VIRGINIA TO
   15 MILES EAST NORTHEAST OF HAGERSTOWN MARYLAND.
   
   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.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 832...WW 833...
   
   DISCUSSION...NARROW AREA OF HEATING AND DESTABILIZATION HAS OCCURRED
   JUST NORTH OF TORNADO WATCH 833 INTO NRN MD.  GIVEN THE EXTREME LOW
   LEVEL SHEAR AND PRESENCE OF SEVERAL ROTATING STORMS NOW MOVING
   RAPIDLY NWD ACROSS NRN VA...THE THREAT OF ISOLATED TORNADOES APPEARS
   TO EXTEND TO THE MD-PA BORDER REGION INTO THE EVENING.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND
   GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
   MEAN STORM MOTION VECTOR 19035.
   
   
   ...EVANS