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020 

WWUS20 KWNS 072259

SEL0

SPC WW 072259

OHZ000-PAZ000-WVZ000-080400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 480

NWS STORM PREDICTION CENTER NORMAN OK

700 PM EDT SAT JUL 7 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN OHIO

       SOUTHWEST PENNSYLVANIA

       THE NORTHERN WEST VIRGINIA PANHANDLE



EFFECTIVE THIS SATURDAY NIGHT FROM 700 PM UNTIL MIDNIGHT 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 APPROXIMATELY ALONG AND 30

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTHWEST

OF WHEELING WEST VIRGINIA TO 25 MILES SOUTHEAST OF LATROBE

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 478. WATCH NUMBER 478 WILL NOT

BE IN EFFECT AFTER 700 PM EDT. CONTINUE...WW 477...WW 479...



DISCUSSION...SCTD TSTMS...INCLUDING A FEW SUSTAINED

STORMS...EXPECTED TO CONTINUE FORMING ALONG SLOWLY-MOVING WNW-ESE

COLD FRONT.  VERY WARM LOW LVL TEMPS/STEEP LOW LVL LAPSE

RATES...WEAK UPSLOPE FLOW...AND 25-30 MID LVL WNW FLOW MAY SUPPORT A

CONTINUED RISK FOR LOCALLY DMGG WIND AND SVR HAIL THROUGH LATE EVE.



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 550. MEAN STORM

MOTION VECTOR 30020.





...CORFIDI

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