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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 67

NWS STORM PREDICTION CENTER NORMAN OK

450 PM EDT THU APR 8 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL NEW YORK

       EASTERN PENNSYLVANIA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 450 PM UNTIL

1000 PM EDT.



HAIL TO 0.5 INCH 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 75

STATUTE MILES EITHER SIDE OF A LINE FROM 55 MILES EAST SOUTHEAST

OF SYRACUSE NEW YORK TO 25 MILES WEST SOUTHWEST OF STATE COLLEGE

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 65...WW 66...



DISCUSSION...LINE OF CONVECTION HAD RECENTLY DEVELOPED IN SRN PA AND

IS EXPECTED TO MOVE RAPIDLY NNEWD AT 50-60 MPH INTO THE EVENING

HOURS. DESPITE WEAK INSTABILITY...THE FAST MOTION OF THE CONVECTIVE

LINE COMBINED WITH 50-60 KT MEAN SWLY FLOW ALOFT... PERPENDICULAR TO

THE THUNDERSTORM LINE...AND STEEP LOW LEVEL LAPSE RATES WILL BE

FAVORABLE FOR DAMAGING WIND GUSTS.



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

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350. MEAN STORM

MOTION VECTOR 21050.





...IMY

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