WATCHES: Severe Thunderstorm Watch Number 654

WWUS20 KWNS 172337
SEL4
SPC WW 172337
NHZ000-NYZ000-VTZ000-180500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 654
NWS STORM PREDICTION CENTER NORMAN OK
740 PM EDT SUN JUL 17 2011

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

NORTHERN NEW HAMPSHIRE
UPSTATE NEW YORK
NORTHERN VERMONT

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 740 PM UNTIL
100 AM 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 40
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH
SOUTHWEST OF MASSENA NEW YORK TO 15 MILES SOUTH SOUTHEAST OF
BERLIN NEW HAMPSHIRE. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

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 652...WW 653...

DISCUSSION...A FAST MOVING BOW ECHO ALONG THE ONTARIO/QUEBEC BORDER
WILL TRACK RAPIDLY SOUTHEASTWARD ACROSS THE WATCH AREA DURING THE
NEXT FEW HOURS. STRONG WINDS ALOFT AND STEEP LOW LEVEL LAPSE RATES
WILL PROMOTE A RISK OF DAMAGING WINDS ALONG THE LEADING EDGE OF THE
BOW. INSTABILITY WILL BEGIN TO WEAKEN AFTER SUNSET...WHICH MAY
LIMIT THE SOUTH AND SOUTHEASTWARD EXTENT OF THE SEVERE THREAT.

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 30040.

...HART

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