URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 482 NWS STORM PREDICTION CENTER NORMAN OK 350 PM EDT WED AUG 7 2013 THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EASTERN OHIO WESTERN PENNSYLVANIA PENNSYLVANIA NORTHERN WEST VIRGINIA PANHANDLE * EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 350 PM UNTIL 1000 PM EDT. * PRIMARY THREATS INCLUDE... SEVERAL DAMAGING WIND GUSTS TO 60 MPH POSSIBLE SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE A FEW TORNADOES POSSIBLE THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTHWEST OF WHEELING WEST VIRGINIA TO 30 MILES EAST NORTHEAST OF LATROBE PENNSYLVANIA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2). PRECAUTIONARY/PREPAREDNESS ACTIONS... 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...STRONG/ISOLATED SEVERE STORM DEVELOPMENT IS ALREADY UNDERWAY...AND COULD STILL INCREASE IN COVERAGE AND INTENSITY DURING THE NEXT COUPLE OF HOURS AS IT DEVELOPS EAST SOUTHEASTWARD ALONG A WARM FRONTAL TYPE ZONE...ACROSS THE UPPER OHIO VALLEY THROUGH THE ALLEGHENY FRONT. ALTHOUGH LOW-LEVEL SHEAR IS WEAK...DEEP LAYER SHEAR IS SUFFICIENT FOR UPDRAFT ROTATION...AND IT IS NOT OUT OF THE QUESTION THAT THE MOIST BOUNDARY LAYER COULD SUPPORT A BRIEF TORNADO. BUT MARGINALLY SEVERE HAIL MAY BE THE PRIMARY HAZARD... BEFORE SOME STORM CONSOLIDATION AND UPSCALE GROWTH YIELDS AN INCREASING RISK FOR DAMAGING WIND GUSTS LATE THIS AFTERNOON INTO EARLY EVENING. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 29030.
Posted on: Wed, 07 Aug 2013 20:45:02 +0000
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