

517 

WWUS20 KWNS 252129

SEL3

SPC WW 252129

NJZ000-NYZ000-PAZ000-VTZ000-260300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 513

NWS STORM PREDICTION CENTER NORMAN OK

530 PM EDT THU JUN 25 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF NORTHERN NEW JERSEY

       PARTS OF SOUTHEAST NEW YORK

       PARTS OF NORTHEAST PENNSYLVANIA

       SMALL PART OF SOUTHERN VERMONT



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 530 PM UNTIL

1100 PM 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 60

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

NORTHWEST OF ALBANY NEW YORK TO 30 MILES SOUTHEAST OF WILKESBARRE

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 508...WW 509...WW

510...WW 511...WW 512...



DISCUSSION...STRONG/SEVERE THUNDERSTORMS DEVELOPING IN A

MOIST/UNSTABLE  AIR MASS WITHIN A  RATHER WEAK WIND FIELD.  WITH

STEEP LOW LEVEL LAPSE RATES...PULSE SEVERE/DAMAGING WIND STORMS WILL

DEVELOP ALONG WITH A MORE ORGANIZED COLD POOL THAT HAS DEVELOP

CENTRAL NY AND MOVING EWD.



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 30015.





...HALES

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