

747 

WWUS20 KWNS 041728

SEL9

SPC WW 041728

CTZ000-MAZ000-NHZ000-NYZ000-PAZ000-VTZ000-050000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 139

NWS STORM PREDICTION CENTER NORMAN OK

125 PM EDT TUE MAY 4 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN CONNECTICUT

       WESTERN AND CENTRAL MASSACHUSETTS

       CENTRAL AND SOUTHERN NEW HAMPSHIRE

       EASTERN NEW YORK

       NORTHEAST PENNSYLVANIA

       CENTRAL AND SOUTHERN VERMONT



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 125 PM UNTIL

800 PM EDT.



HAIL TO 1 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 100

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHWEST OF

LEBANON NEW HAMPSHIRE TO 20 MILES SOUTHEAST OF WILKESBARRE

PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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...THUNDERSTORMS CONTINUE TO DEVELOP AND MOVE QUICKLY EWD

ACROSS PARTS OF PA/NY/SRN NEW ENGLAND...AHEAD OF A PRONOUNCED UPPER

VORT MAX NOW CROSSING SRN ONTARIO.  CONTINUED

HEATING/DESTABILIZATION COMBINED WITH MODERATELY-STRONG/ROUGHLY

UNIDIRECTIONAL WLY FLOW ALOFT WILL SUPPORT A THREAT FOR LOCALLY

DAMAGING WINDS...AND MARGINALLY-SEVERE HAIL WILL ALSO BE POSSIBLE

WITH STRONGER STORMS INTO EARLY EVENING.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM MOTION

VECTOR 26040.





...GOSS

