

177 

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

