The counties highlighted in blue are under a Severe Thunderstorm Watch until 8 PM EDT this evening.

Nelson County, Virginia
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URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 377
NWS STORM PREDICTION CENTER NORMAN OK
200 PM EDT THU JUN 11 2009

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

DISTRICT OF COLUMBIA
MUCH OF CENTRAL MARYLAND
CENTRAL VIRGINIA
THE EXTREME ERN WEST VIRGINIA PANHANDLE
COASTAL WATERS

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 200 PM UNTIL
800 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 60
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES EAST
NORTHEAST OF MARTINSBURG WEST VIRGINIA TO 10 MILES SOUTH
SOUTHWEST OF SOUTH HILL VIRGINIA. 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 374…WW 375…WW 376…

DISCUSSION…THE REMNANT OUTFLOW WITH AN OVERNIGHT AND MORNING MCS
IS PROGRESSING EWD INTO WRN/CENTRAL VA AND MD ALONG WITH A BELT OF
40-50 KT MID LEVEL FLOW ACCOMPANYING AN ASSOCIATED MCV. GIVEN
SURFACE HEATING/DESTABILIZATION E OF THIS SYSTEM…ESPECIALLY ACROSS
CENTRAL/SRN VA…EXPECT CONVECTION TO INCREASE ALONG THE OUTFLOW
BOUNDARY WITH AN INCREASING THREAT FOR DAMAGING WINDS AND LARGE HAIL
THROUGH THE AFTERNOON.

SEVERE THUNDERSTORM WATCH 377 IS IN EFFECT UNTIL 800 PM EDT
FOR THE FOLLOWING LOCATIONS

DCC001-120000-
/O.NEW.KWNS.SV.A.0377.090611T1800Z-090612T0000Z/

DC
. DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE

DISTRICT OF COLUMBIA

MDC003-005-009-013-017-021-025-027-031-033-037-043-510-120000-
/O.NEW.KWNS.SV.A.0377.090611T1800Z-090612T0000Z/

MD
. MARYLAND COUNTIES INCLUDED ARE

ANNE ARUNDEL BALTIMORE CALVERT
CARROLL CHARLES FREDERICK
HARFORD HOWARD MONTGOMERY
PRINCE GEORGES ST. MARYS WASHINGTON

MARYLAND INDEPENDENT CITIES INCLUDED ARE

BALTIMORE CITY

VAC003-007-011-013-025-029-033-036-037-041-043-047-049-053-057-
059-061-065-069-073-075-079-081-083-085-087-093-095-097-099-101-
103-107-109-111-113-117-119-125-127-133-135-137-145-147-149-153-
157-159-175-177-179-181-183-187-193-510-540-570-595-600-610-620-
630-670-683-685-730-760-800-830-840-120000-
/O.NEW.KWNS.SV.A.0377.090611T1800Z-090612T0000Z/

VA
. VIRGINIA COUNTIES INCLUDED ARE

ALBEMARLE AMELIA APPOMATTOX
ARLINGTON BRUNSWICK BUCKINGHAM
CAROLINE CHARLES CITY CHARLOTTE
CHESTERFIELD CLARKE CULPEPER
CUMBERLAND DINWIDDIE ESSEX
FAIRFAX FAUQUIER FLUVANNA
FREDERICK GLOUCESTER GOOCHLAND
GREENE GREENSVILLE HALIFAX
HANOVER HENRICO ISLE OF WIGHT
JAMES CITY KING AND QUEEN KING GEORGE
KING WILLIAM LANCASTER LOUDOUN
LOUISA LUNENBURG MADISON
MECKLENBURG MIDDLESEX NELSON
NEW KENT NORTHUMBERLAND NOTTOWAY
ORANGE POWHATAN PRINCE EDWARD
PRINCE GEORGE PRINCE WILLIAM RAPPAHANNOCK
RICHMOND SOUTHAMPTON SPOTSYLVANIA
STAFFORD SURRY SUSSEX
WARREN WESTMORELAND

VIRGINIA INDEPENDENT CITIES INCLUDED ARE

ALEXANDRIA CHARLOTTESVILLE COLONIAL HEIGHTS
EMPORIA FAIRFAX FALLS CHURCH
FRANKLIN FREDERICKSBURG HOPEWELL
MANASSAS MANASSAS PARK PETERSBURG
RICHMOND SUFFOLK WILLIAMSBURG
WINCHESTER

WVC003-037-065-120000-
/O.NEW.KWNS.SV.A.0377.090611T1800Z-090612T0000Z/

WV
. WEST VIRGINIA COUNTIES INCLUDED ARE

BERKELEY JEFFERSON MORGAN