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WWUS20 KWNS 021740

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NYZ000-OHZ000-PAZ000-WVZ000-LEZ000-030000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 245

NWS STORM PREDICTION CENTER NORMAN OK

140 PM EDT WED JUN 2 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF WESTERN NEW YORK

       PARTS OF EASTERN OHIO

       MUCH OF WESTERN PENNSYLVANIA

       SMALL PART OF NORTHERN WEST VIRGINIA

       LAKE ERIE



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 140 PM UNTIL

800 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH OF

JAMESTOWN NEW YORK TO 35 MILES SOUTH SOUTHWEST OF WHEELING WEST

VIRGINIA.  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...THUNDERSTORMS ARE REDEVELOPING ALONG REMNANT OUTFLOW

FROM EARLY MCS ACTIVITY.  AIR MASS HAS DESTABILIZE SUFFICIENTLY

COUPLED WITH 40 KT OF SHEAR TO SUPPORT SEVERE THUNDERSTORMS.

PRIMARY THREAT WILL BE DAMAGING WINDS...HOWEVER SUFFICIENT VEERING

SHEAR PROFILES FOR SUPERCELLS ENHANCING SEVERE POTENTIAL INCLUDING A

POSSIBLE  BRIEF TORNADO.



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 25035.





...HALES

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