WATCHES: Severe Thunderstorm Watch Number 687

WWUS20 KWNS 092133
SEL7
SPC WW 092133
DEZ000-MDZ000-CWZ000-100300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 687
NWS STORM PREDICTION CENTER NORMAN OK
535 PM EDT SUN AUG 9 2009

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

DELAWARE
MARYLAND
COASTAL WATERS

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 535 PM UNTIL
1100 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 50
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH OF
BALTIMORE MARYLAND TO 5 MILES SOUTH OF SALISBURY MARYLAND. 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 682...WW 683...WW
684...WW 685...WW 686...

DISCUSSION...VERY HOT/UNSTABLE CONDITIONS HAVE DEVELOPED ACROSS WW
TODAY IN ADVANCE OF SSEWD MOVING COMPLEX OF STORMS EXPECTED TO MOVE
ACROSS THE REGION THIS EVENING. THIS SHOULD ENHANCE THE RISK OF
STRONG/DAMAGING WINDS UNTIL STORMS SHIFT OFF THE COAST.

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 450. MEAN STORM
MOTION VECTOR 34035.

...EVANS

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