

195 

WWUS20 KWNS 071816

SEL8

SPC WW 071816

OHZ000-PAZ000-WVZ000-072300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 478

NWS STORM PREDICTION CENTER NORMAN OK

215 PM EDT SAT JUL 7 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND EASTERN OHIO

       WESTERN AND CENTRAL PENNSYLVANIA

       NORTHERN WEST VIRGINIA PANHANDLE



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 215 PM UNTIL

700 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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTH

NORTHWEST OF ZANESVILLE OHIO TO 40 MILES NORTH NORTHEAST OF STATE

COLLEGE 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.



OTHER WATCH INFORMATION...CONTINUE...WW 477...



DISCUSSION...NEW STORMS HAVE DEVELOPED OVER EXTREME SWRN NY AND NERN

OH IN ADVANCE OF A COLD FRONT MOVING SEWD ACROSS THE LOWER GREAT

LAKES.  THE AIR MASS IS HOT/MOIST AND VERY UNSTABLE WITH MLCAPE OF

2500-3500 J/KG.  AREA IS ALONG THE SRN EDGE OF STRONGER WNWLY FLOW

ALOFT...PROVIDING SUFFICIENT DEEP LAYER SHEAR FOR ORGANIZED

MULTICELL STORMS TO DEVELOP.  DAMAGING WIND GUSTS AND LARGE HAIL

WILL BE POSSIBLE WITH STRONGER STORMS.



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 550. MEAN STORM

MOTION VECTOR 28025.





...WEISS

