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Severe Thunderstorm Watch 618
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WW0618 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL8
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 618
   NWS STORM PREDICTION CENTER NORMAN OK
   1240 PM EDT FRI JUN 27 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          DISTRICT OF COLUMBIA
          DELAWARE
          EASTERN MARYLAND
          SOUTHERN NEW JERSEY
          PARTS OF SOUTHEAST PENNSYLVANIA
          A LARGE PART OF VIRGINIA
          COASTAL WATERS
   
   EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1240 PM UNTIL
   800 PM EDT.
   
   HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
   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 55 MILES SOUTH
   SOUTHEAST OF ROANOKE VIRGINIA TO 10 MILES NORTH OF PHILADELPHIA
   PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
   
   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 WILL INCREASE IN NUMBER AND INTENSITY
   OVER AND E OF HIGHER TERRAIN AS AIR MASS IS NOW MDTLY UNSTABLE WITH
   MLCAPES AOA 2000 J/KG.  WITH 20-30 KT OF MID LEVEL FLOW PRIMARY
   THREAT WILL BE DAMAGING WINDS ASSOCIATED WITH SHORT LINE SEGMENTS
   ALONG WITH MARGINALLY SEVERE HAIL.  ACTIVITY WILL DEVELOP EWD ACROSS
   THE LOWER ELEVATIONS THRU THE AFTERNOON.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 26020.
   
   
   ...HALES
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