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Severe Thunderstorm Watch 638
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WW0638 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 638
   NWS STORM PREDICTION CENTER NORMAN OK
   1215 PM EDT SUN JUN 29 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          LARGE PART OF WESTERN NEW YORK
          PARTS OF EASTERN OHIO
          LARGE PART OF WESTERN PENNSYLVANIA
          PARTS OF NORTHERN WEST VIRGINIA
          LAKE ERIE
          LAKE ONTARIO
   
   EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 1215 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 65
   STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTHWEST OF
   WATERTOWN NEW YORK TO 45 MILES SOUTHEAST OF ZANESVILLE OHIO.  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.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 637...
   
   DISCUSSION...THUNDERSTORMS ARE INCREASING ALONG/AHEAD OF COLD FRONT
   ACROSS ERN OH. WITH MLCAPES TO 1500 J/KG AND 40KT OF DEEP LAYER
   SHEAR AHEAD OF LARGE UPPER TROUGH...SEVERE THUNDERSTORMS WILL
   DEVELOP AND SPREAD QUICKLY NEWD.  PRIMARY THREAT WILL BE DAMAGING
   WINDS AND HAIL AS STORMS EVOLVE INTO LINE SEGMENTS/BOWS.
   
   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 23035.
   
   
   ...HALES
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