WATCHES: Severe Thunderstorm Watch Number 427

WWUS20 KWNS 281747
SEL7
SPC WW 281747
CTZ000-MAZ000-NHZ000-NJZ000-NYZ000-RIZ000-CWZ000-290100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 427
NWS STORM PREDICTION CENTER NORMAN OK
145 PM EDT MON JUN 28 2010

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

CONNECTICUT
MASSACHUSETTS
SOUTHERN NEW HAMPSHIRE
EXTREME NORTHEAST NEW JERSEY
SOUTHEAST NEW YORK
RHODE ISLAND
COASTAL WATERS

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 145 PM UNTIL 900
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 60
STATUTE MILES EITHER SIDE OF A LINE FROM 25 MILES WEST SOUTHWEST
OF NEWARK NEW JERSEY TO 40 MILES EAST OF BOSTON MASSACHUSETTS.
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 426...

DISCUSSION...DEEPENING CUMULUS CONVECTION IN VISIBLE IMAGERY AND
SURFACE TEMPERATURES IN THE 90S ACROSS INTERIOR SRN NEW ENGLAND
SUGGEST THAT THUNDERSTORM DEVELOPMENT IS LIKELY WITHIN THE NEXT 1-2
HOURS. GIVEN 35-45 KT WSWLY MIDLEVEL FLOW AND MODERATE
INSTABILITY...ORGANIZED MULTICELL CLUSTERS AND EMBEDDED
BOWS/SUPERCELLS WILL BE CAPABLE OF PRODUCING DAMAGING GUSTS THROUGH
THE AFTERNOON/EVENING AS STORMS INCREASE IN COVERAGE AND SPREAD
TOWARD THE COAST.

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 500. MEAN STORM MOTION
VECTOR 26035.

...THOMPSON

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