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000 

WWUS20 KWNS 292011

SEL2

SPC WW 292011

CTZ000-MAZ000-NJZ000-NYZ000-PAZ000-VTZ000-CWZ000-300300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 642

NWS STORM PREDICTION CENTER NORMAN OK

410 PM EDT SUN JUN 29 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN CONNECTICUT

       WESTERN MASSACHUSETTS

       MUCH OF NEW JERSEY

       MUCH OF EASTERN NEW YORK

       MUCH OF CENTRAL AND EASTERN PENNSYLVANIA

       PARTS OF SOUTHERN VERMONT

       COASTAL WATERS



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 410 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 125

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

HARRISBURG PENNSYLVANIA TO 45 MILES NORTH NORTHEAST OF SARANAC

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 637...WW 638...WW

639...WW 640...WW 641...



DISCUSSION...THUNDERSTORMS INCREASING IN NUMBER AND INTENSITY OVER

MUCH OF THE WATCH AREA AS AIR MASS BECOMES MDTLY UNSTABLE.  WITH

30-40 KT OF SHEAR AND MLCAPES TO 2000 J/KG...SEVERE THUNDERSTORMS

WITH PRIMARY THREAT OF DAMAGING WINDS WILL INCREASER REMAINDER OF

AFTERNOON.



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 23030.





...HALES

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