WATCHES: Severe Thunderstorm Watch Number 325

WWUS20 KWNS 031709
SEL5
SPC WW 031709
DCZ000-DEZ000-MDZ000-NJZ000-VAZ000-WVZ000-CWZ000-040000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 325
NWS STORM PREDICTION CENTER NORMAN OK
105 PM EDT WED JUN 3 2009

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

DISTRICT OF COLUMBIA
DELAWARE
MUCH OF MARYLAND
SOUTHERN NEW JERSEY
CENTRAL AND NORTHERN VIRGINIA
CENTRAL...SOUTHERN AND EASTERN WEST VIRGINIA
COASTAL WATERS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 105 PM UNTIL
800 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 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTH
SOUTHWEST OF CHARLESTON WEST VIRGINIA TO 40 MILES NORTHEAST OF
SALISBURY MARYLAND. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).

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 LIKELY INCREASE IN
COVERAGE/INTENSITY ALONG AND S OF A SLOW-MOVING COLD FRONT FROM WV
INTO THE NRN CHESAPEAKE REGION THROUGH THE AFTERNOON AS SURFACE
HEATING RESULTS IN SUBSTANTIAL DESTABILIZATION. MODERATE
INSTABILITY AND 25-30 KT LOW-MID LEVEL FLOW WILL SUPPORT ORGANIZED
MULTICELL CLUSTERS/LINE SEGMENTS CAPABLE OF PRODUCING DAMAGING WINDS
AND LARGE HAIL. OTHER SMALLER SCALE CONVECTIVE OUTFLOWS AND TERRAIN
INFLUENCES WILL SUPPORT THE THREAT OF AT LEAST ISOLATED PULSE-TYPE
SEVERE STORMS FARTHER S IN VA.

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 500. MEAN STORM
MOTION VECTOR 26030.

...THOMPSON

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