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000 

WWUS20 KWNS 021753

SEL1

SPC WW 021753

CTZ000-MAZ000-MEZ000-NHZ000-NYZ000-RIZ000-VTZ000-CWZ000-030000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 331

NWS STORM PREDICTION CENTER NORMAN OK

150 PM EDT SAT JUN 2 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN CONNECTICUT

       MASSACHUSETTS

       SOUTHERN MAINE

       SOUTHERN NEW HAMPSHIRE

       EASTERN AND NORTHERN NEW YORK

       NORTHERN RHODE ISLAND

       SOUTHERN VERMONT

       COASTAL WATERS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 150 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 65

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

SOUTHWEST OF SARANAC LAKE NEW YORK TO 20 MILES SOUTH OF

PORTSMOUTH NEW HAMPSHIRE.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 330...



DISCUSSION...SCATTERED THUNDERSTORMS WILL DEVELOP AND INTENSIFY

THOUGH THE AFTERNOON ALONG AND S OF A STATIONARY FRONT ACROSS NRN

NEW ENGLAND.  MODERATE INSTABILITY /SBCAPE VALUES NEAR 1500 J/KG/

AND 0-6 KM BULK SHEAR OF 30-40 KT WILL SUPPORT A FEW STORMS WITH

SUPERCELL STRUCTURES...WHICH WILL LOCALLY ENHANCE THE THREAT FOR

LARGE HAIL AND DAMAGING WINDS.  IN ADDITION...CONVECTION FORMING IN

ONTARIO MAY EVENTUALLY SPREAD INTO UPSTATE NY LATER THIS

AFTERNOON/EVENING.  FARTHER S...VERTICAL SHEAR IS WEAKER ACROSS

INTERIOR SE NY AND SRN NEW ENGLAND...BUT A FEW OF THE STRONGER

STORMS MAY PRODUCE ISOLATED DAMAGING DOWNBURSTS AND SOME 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 30030.





...THOMPSON

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