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000 

WWUS20 KWNS 271751

SEL0

SPC WW 271751

CTZ000-MAZ000-NHZ000-NYZ000-VTZ000-280200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 690

NWS STORM PREDICTION CENTER NORMAN OK

150 PM EDT THU SEP 27 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWESTERN CONNECTICUT

       FAR WESTERN MASSACHUSETTS

       MUCH OF NEW HAMPSHIRE

       EASTERN NEW YORK

       VERMONT



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 150 PM UNTIL

1000 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 80

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

NEWPORT VERMONT TO 55 MILES EAST SOUTHEAST OF BINGHAMTON NEW

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...TSTMS ARE EXPECTED TO INCREASE IN BOTH COVERAGE AND

INTENSITY THIS AFTERNOON ALONG PRE-FRONTAL TROUGH AND AHEAD OF COLD

FRONT WHERE AIR MASS HAS BECOME MODERATELY UNSTABLE WITH MLCAPES OF

1000-1500 J/KG.  STEEP LOW-LEVEL LAPSE RATES COUPLED WITH SWLY...

UNIDIRECTIONAL WIND PROFILES INDICATE THE POTENTIAL FOR DAMAGING

WINDS WITH ANY LINE SEGMENTS/STORM CLUSTERS THAT DEVELOP.



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 450. MEAN STORM MOTION

VECTOR 25035.





...CARBIN/MEAD

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