

000 

WWUS20 KWNS 271843

SEL7

SPC WW 271843

MEZ000-NHZ000-NYZ000-VTZ000-CWZ000-280200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 457

NWS STORM PREDICTION CENTER NORMAN OK

245 PM EDT WED JUN 27 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN MAINE

       MUCH OF NEW HAMPSHIRE

       NORTHEAST NEW YORK

       MUCH OF VERMONT

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 245 PM UNTIL

1000 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 80

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTHEAST

OF BAR HARBOR MAINE TO 40 MILES SOUTH SOUTHWEST OF SARANAC LAKE

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 456...



DISCUSSION...ISOLATED THUNDERSTORMS ARE INCREASING THIS AFTERNOON

ALONG SURFACE COLD FRONT EXTENDING ACROSS CENTRAL MAINE.  OTHER MORE

ISOLATED STORMS ARE EXPECTED TO INTENSIFY FROM NORTHEAST NY INTO

VT/NH IN AXIS OF MODERATE INSTABILITY.  VERTICAL SHEAR PROFILES ARE

STRONG ENOUGH TO PROMOTE MULTICELLS CAPABLE OF DAMAGING WINDS AND

LARGE 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 27025.





...HART

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