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WWUS20 KWNS 091731

SEL5

SPC WW 091731

NYZ000-PAZ000-100000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 355

NWS STORM PREDICTION CENTER NORMAN OK

130 PM EDT TUE JUN 9 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL AND CENTRAL NEW YORK

       CENTRAL AND EASTERN PENNSYLVANIA



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 130 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 75 MILES NORTHEAST OF

BINGHAMTON NEW YORK TO 50 MILES SOUTHWEST OF HARRISBURG

PENNSYLVANIA.  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 354...



DISCUSSION...SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG

AND AHEAD OF  A COLD FRONT AND A SUBTLE MID LEVEL TROUGH MOVING EWD

INTO CENTRAL NY/PA THIS AFTERNOON...AND W OF THE COOL AIR MASS STILL

RESIDING OVER NEW ENGLAND.  MODERATE INSTABILITY AND 30-40 KT

LOW-MID LEVEL FLOW SHOULD SUPPORT A FEW ORGANIZED MULTICELLS...AND

POSSIBLY ISOLATED SUPERCELLS...CAPABLE OF PRODUCING DAMAGING WINDS

AND LARGE HAIL.



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 27025.





...THOMPSON

