WATCHES: Severe Thunderstorm Watch Number 663

WWUS20 KWNS 301909
SEL3
SPC WW 301909
MAZ000-MEZ000-NHZ000-NYZ000-VTZ000-310100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 663
NWS STORM PREDICTION CENTER NORMAN OK
310 PM EDT THU AUG 30 2007

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

WESTERN MASSACHUSETTS
WEST AND SOUTHERN MAINE
NEW HAMPSHIRE
EASTERN NEW YORK
CENTRAL AND SOUTHERN VERMONT

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 310 PM UNTIL
900 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 45 MILES WEST
NORTHWEST OF ALBANY NEW YORK TO 15 MILES EAST OF AUGUSTA MAINE.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU3).

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...BROAD AREA OF MID LEVEL HEIGHTS FALLS WILL OVERSPREAD
THE NORTHEAST AHEAD OF PROGRESSIVE TROUGH MOVING ACROSS ONTARIO/WRN
QUEBEC ATTM. THIS IS HELPING DRIVE A SURFACE COLD SEWD INTO NEW
ENGLAND...WHERE PREFRONTAL TEMPERATURES WILL REACH INTO THE UPPER
80S/LOWER 90S IN SOME LOCATIONS. RESULTANT MODERATE INSTABILITY AND
MODEST SWLY FLOW ALOFT/SHEAR WILL CONTINUE TO SUPPORT STRONG TO
SEVERE STORMS...INCLUDING A FEW ORGANIZED LINES/CLUSTERS AND
POSSIBLY A SUPERCELL OR TWO. DAMAGING WINDS AND LARGE HAIL SHOULD
ACCOMPANY THE MORE INTENSE STORMS.

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 26020.

..EVANS

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