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000 

WWUS20 KWNS 271751

SEL0

SPC WW 271751

NYZ000-OHZ000-PAZ000-WVZ000-280000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 300

NWS STORM PREDICTION CENTER NORMAN OK

150 PM EDT SUN MAY 27 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL NEW YORK

       EASTERN OHIO

       WESTERN AND NORTHERN PENNSYLVANIA

       NORTHERN WEST VIRGINIA PANHANDLE



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 150 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 70

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

NORTHWEST OF WHEELING WEST VIRGINIA TO 45 MILES NORTH NORTHEAST

OF MONTICELLO NEW YORK.  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.



DISCUSSION...SCATTERED THUNDERSTORMS ARE INCREASING ACROSS EASTERN

OH AND MUCH OF PA THIS AFTERNOON IN AXIS OF WARM/MOIST AND

MODERATELY UNSTABLE AIR MASS.  DESPITE ONLY MARGINAL VERTICAL

SHEAR...STEEP LOW LEVEL LAPSE RATES AND 30+ KNOT WESTERLY FLOW ALOFT

WILL PROMOTE GUSTY/DAMAGING WINDS IN STRONGER STORMS.



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 450. MEAN STORM

MOTION VECTOR 24025.





...HART

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