

232 

WWUS20 KWNS 282002

SEL5

SPC WW 282002

OHZ000-PAZ000-WVZ000-LEZ000-290200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 695

NWS STORM PREDICTION CENTER NORMAN OK

400 PM EDT THU JUL 28 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN AND EASTERN OHIO

       WESTERN PENNSYLVANIA

       NORTHERN WEST VIRGINIA PANHANDLE

       LAKE ERIE



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 400 PM UNTIL

1000 PM 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 50

STATUTE MILES EITHER SIDE OF A LINE FROM 60 MILES WEST NORTHWEST

OF MANSFIELD OHIO TO 25 MILES NORTH NORTHEAST OF LATROBE

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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...STORMS ARE EVELOPING FROMNWRN OH INTO WRN PA WITHIN LOW

LEVEL MOISTURE/INSTABILITY AXIS WHERE SURFACE DEW POINTS ARE IN THE

LOW 70S AND MLCAPE IS 2000-2500 J/KG.  VAD WINDS AT CLE AND PBZ SHOW

30-35 KT WNWLY WINDS ABOVE 3 KM WHICH SHOULD PROVIDE SUFFICIENT LOW

LEVEL SHEAR TO ENHANCE SEVERE THUNDERSTORM THREAT.  STRONGER CELLS

WILL BE CAPABLE OF PRODUCING DAMAGING WIND GUSTS AND OCCASIONAL HAIL

AS ACTIVITY SPREADS/DEVELOPS ESEWD WITH TIME.



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 500. MEAN STORM

MOTION VECTOR 28025.





...WEISS

