WATCHES: Severe Thunderstorm Watch Number 817

WWUS20 KWNS 101440
SEL7
SPC WW 101440
CTZ000-DEZ000-MAZ000-NJZ000-NYZ000-PAZ000-VTZ000-CWZ000-102300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 817
NWS STORM PREDICTION CENTER NORMAN OK
1040 AM EDT SUN AUG 10 2008

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

WESTERN CONNECTICUT
NORTHERN DELAWARE
FAR WESTERN MASSACHUSETTS
NEW JERSEY
EASTERN NEW YORK
EASTERN PENNSYLVANIA
FAR SOUTHERN VERMONT
COASTAL WATERS

EFFECTIVE THIS SUNDAY MORNING AND EVENING FROM 1040 AM UNTIL 700
PM EDT.

HAIL TO 2 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 50
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTHEAST OF
PHILADELPHIA PENNSYLVANIA TO 25 MILES NORTH NORTHWEST OF GLENS
FALLS 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.

DISCUSSION...THUNDERSTORMS WILL BECOME INCREASINGLY WIDESPREAD AS
AFTERNOON HEATING ELIMINATES SURFACE INHIBITION AND BOOSTS MLCAPE
INTO THE 1000-1500 J/KG RANGE ACROSS THIS REGION. VERY COLD AIR
ALOFT WILL SUPPORT LARGE HAIL THREAT...ALONG WITH POTENTIAL FOR
ISOLATED DAMAGING WINDS...DESPITE THE MODEST DEEP LAYER FLOW.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM
MOTION VECTOR 22015.

...EVANS

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