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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 145

NWS STORM PREDICTION CENTER NORMAN OK

930 PM EDT FRI MAY 7 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SMALL PART OF SOUTHWEST NEW YORK

       PARTS OF EASTERN OHIO

       LARGE PART OF WESTERN PENNSYLVANIA

       SMALL PART OF WEST VIRGINIA PANHANDLE

       LAKE ERIE



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 930 PM

UNTIL 300 AM 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 65

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

WHEELING WEST VIRGINIA TO 35 MILES NORTH NORTHEAST OF JAMESTOWN

NEW YORK.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 143...WW 144...



DISCUSSION...DEEPENING SURFACE LOW TRACKING ACROSS LAKE ERIE TOWARD

BUF WITH WARM FRONT EXTENDING SEWD INTO WRN PA. SEVERE THUNDERSTORMS

ONGOING  NRN OH EXPECTED TO SPREAD/DEVELOP RAPIDLY ENEWD ACROSS

WATCH WHERE VERY STRONG SHEAR PROFILES ARE IN PLACE.  IN ADDITION TO

LARGE HAIL THE MODEST INSTABILITY WILL SUPPORT A WIND DAMAGE THREAT.



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 500. MEAN STORM

MOTION VECTOR 26045.





...HALES

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