

637 

WWUS20 KWNS 291649

SEL4

SPC WW 291649

CTZ000-MAZ000-NJZ000-NYZ000-PAZ000-VTZ000-CWZ000-300000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 634

NWS STORM PREDICTION CENTER NORMAN OK

1250 PM EDT WED JUL 29 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN CONNECTICUT

       WESTERN MASSACHUSETTS

       NORTHERN NEW JERSEY

       SOUTHERN AND EASTERN NEW YORK

       NORTHEASTERN PENNSYLVANIA

       SOUTHERN VERMONT

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL

800 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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES EAST OF

TRENTON NEW JERSEY TO 25 MILES NORTH NORTHWEST OF ALBANY NEW

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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.



DISCUSSION...STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO CONTINUE

DEVELOPING AHEAD OF SUBTLE SHORTWAVE TROUGH MOVING INTO THE NRN MID

ATLANTIC REGION TODAY.  MODERATE INSTABILITY AND 35-45 KT EFFECTIVE

SHEAR SHOULD SUPPORT SUPERCELLS...ALONG WITH SMALL BOW ECHOES...WITH

PRIMARY THREATS OF LARGE HAIL AND DAMAGING WINDS.



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 450. MEAN STORM

MOTION VECTOR 25020.





...EVANS

