WATCHES: Severe Thunderstorm Watch Number 356

WWUS20 KWNS 201637
SEL6
SPC WW 201637
MAZ000-MEZ000-NHZ000-CWZ000-202300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 356
NWS STORM PREDICTION CENTER NORMAN OK
1240 PM EDT SUN JUN 20 2010

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

MUCH OF EASTERN MASSACHUSETTS
MUCH OF MAINE
MUCH OF NEW HAMPSHIRE
COASTAL WATERS

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 1240 PM UNTIL
700 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 85
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH
SOUTHEAST OF HOULTON MAINE TO 45 MILES NORTH NORTHWEST OF
WORCESTER MASSACHUSETTS. FOR A COMPLETE DEPICTION OF THE WATCH
SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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...THUNDERSTORMS ARE INCREASING IN NUMBER AND INTENSITY
OVER THE MOUNTAINS OF NEW ENGLAND. WITH STRONG HEATING ACROSS LOWER
ELEVATIONS...MLCAPES ARE AOA 1000 J/KG. COUPLED WITH 30-35 KT OF
SHEAR...A FEW OF THE THUNDERSTORMS WILL BECOME SEVERE AS THEY
DEVELOP/MOVE EWD ACROSS THE WATCH.

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.

...HALES

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