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000 

WWUS20 KWNS 081858

SEL1

SPC WW 081858

NYZ000-PAZ000-LEZ000-LOZ000-090200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 371

NWS STORM PREDICTION CENTER NORMAN OK

255 PM EDT FRI JUN 8 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL NEW YORK

       LARGE PART OF NORTHERN AND WESTERN PENNSYLVANIA

       LAKE ERIE

       LAKE ONTARIO



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 255 PM UNTIL

1000 PM EDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 95

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST

SOUTHWEST OF FRANKLIN PENNSYLVANIA TO 10 MILES SOUTHEAST OF UTICA

NEW YORK.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 367...WW 368...WW

369...WW 370...



DISCUSSION...SEVERE THUNDERSTORMS CONTINUE TO INCREASE IN NUMBER AND

INTENSITY ACROSS OH AHEAD OF STRONG UPPER S/WV TROUGH.  AIR MASS EWD

INTO PA/NY HAS BECOME VERY UNSTABLE WITH MLCAPES AOA 2000 J/KG

COMMON.  WITH 40-50 KT OF SHEAR SEVERE THUNDERSTORMS WILL MOVE EWD

INTO THE WATCH WITH LINE SEGMENTS/BOWS EVOLVING ASSOCIATED WITH AN

ENHANCED WIND DAMAGE POTENTIAL.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 24040.





...HALES

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