SEL4

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 604
NWS Storm Prediction Center Norman OK
230 PM EDT Thu Aug 20 2026

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
District Of Columbia
Delaware
Central and Eastern Maryland
Northeast North Carolina
Much of New Jersey
Eastern and Southeast Pennsylvania
Northern into Southern and Eastern Virginia
Coastal Waters

* Effective this Thursday afternoon and evening from 230 PM until
1000 PM EDT.

* Primary threats include...
Scattered damaging wind gusts to 70 mph likely
Isolated large hail events to 1.5 inches in diameter possible
A tornado or two possible

SUMMARY...Scattered severe thunderstorms are forecast to develop and
intensify this afternoon. The stronger thunderstorms will likely
organize into line segments and a few supercells. Scattered
damaging gusts will be the primary hazard but a tornado or two is
possible. Upscale growth into one or more line segments is expected
by the evening as this activity moves east towards the coast.

The severe thunderstorm watch area is approximately along and 90
statute miles east and west of a line from 20 miles north northwest
of Trenton NJ to 15 miles southeast of Roanoke Rapids NC. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU4).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

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 500. Mean storm motion vector
26025.

...Smith

WOUS64 KWNS 201829
WOU4

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 604
NWS STORM PREDICTION CENTER NORMAN OK
230 PM EDT THU AUG 20 2026

SEVERE THUNDERSTORM WATCH 604 IS IN EFFECT UNTIL 1000 PM EDT
FOR THE FOLLOWING LOCATIONS

DCC001-210200-
/O.NEW.KWNS.SV.A.0604.260820T1830Z-260821T0200Z/

DC
. DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE

DISTRICT OF COLUMBIA


DEC001-003-005-210200-
/O.NEW.KWNS.SV.A.0604.260820T1830Z-260821T0200Z/

DE
. DELAWARE COUNTIES INCLUDED ARE

KENT NEW CASTLE SUSSEX


MDC003-005-009-011-013-015-017-019-021-025-027-029-031-033-035-
037-039-041-045-047-510-210200-
/O.NEW.KWNS.SV.A.0604.260820T1830Z-260821T0200Z/

MD
. MARYLAND COUNTIES INCLUDED ARE

ANNE ARUNDEL BALTIMORE CALVERT
CAROLINE CARROLL CECIL
CHARLES DORCHESTER FREDERICK
HARFORD HOWARD KENT
MONTGOMERY PRINCE GEORGES QUEEN ANNE'S
SOMERSET ST. MARYS TALBOT
WICOMICO WORCESTER


MARYLAND INDEPENDENT CITIES INCLUDED ARE

BALTIMORE CITY


NCC015-029-041-053-073-091-131-139-143-210200-
/O.NEW.KWNS.SV.A.0604.260820T1830Z-260821T0200Z/

NC
. NORTH CAROLINA COUNTIES INCLUDED ARE

BERTIE CAMDEN CHOWAN
CURRITUCK GATES HERTFORD
NORTHAMPTON PASQUOTANK PERQUIMANS


NJC001-005-007-009-011-015-019-021-023-025-029-033-035-041-
210200-
/O.NEW.KWNS.SV.A.0604.260820T1830Z-260821T0200Z/

NJ
. NEW JERSEY COUNTIES INCLUDED ARE

ATLANTIC BURLINGTON CAMDEN
CAPE MAY CUMBERLAND GLOUCESTER
HUNTERDON MERCER MIDDLESEX
MONMOUTH OCEAN SALEM
SOMERSET WARREN


PAC001-011-017-029-045-071-075-077-091-095-101-133-210200-
/O.NEW.KWNS.SV.A.0604.260820T1830Z-260821T0200Z/

PA
. PENNSYLVANIA COUNTIES INCLUDED ARE

ADAMS BERKS BUCKS
CHESTER DELAWARE LANCASTER
LEBANON LEHIGH MONTGOMERY
NORTHAMPTON PHILADELPHIA YORK


VAC001-007-013-025-033-036-041-047-049-053-057-059-061-065-073-
075-081-085-087-093-095-097-099-101-103-107-109-111-113-115-117-
119-127-131-133-135-137-145-147-149-153-157-159-175-177-179-181-
183-193-199-510-550-570-595-600-610-620-630-650-670-683-685-700-
710-730-735-740-760-800-810-830-210200-
/O.NEW.KWNS.SV.A.0604.260820T1830Z-260821T0200Z/

VA
. VIRGINIA COUNTIES INCLUDED ARE

ACCOMACK AMELIA ARLINGTON
BRUNSWICK CAROLINE CHARLES CITY
CHESTERFIELD CULPEPER CUMBERLAND
DINWIDDIE ESSEX FAIRFAX
FAUQUIER FLUVANNA GLOUCESTER
GOOCHLAND GREENSVILLE HANOVER
HENRICO ISLE OF WIGHT JAMES CITY
KING AND QUEEN KING GEORGE KING WILLIAM
LANCASTER LOUDOUN LOUISA
LUNENBURG MADISON MATHEWS
MECKLENBURG MIDDLESEX NEW KENT
NORTHAMPTON NORTHUMBERLAND NOTTOWAY
ORANGE POWHATAN PRINCE EDWARD
PRINCE GEORGE PRINCE WILLIAM RAPPAHANNOCK
RICHMOND SOUTHAMPTON SPOTSYLVANIA
STAFFORD SURRY SUSSEX
WESTMORELAND YORK


VIRGINIA INDEPENDENT CITIES INCLUDED ARE

ALEXANDRIA CHESAPEAKE COLONIAL HEIGHTS
EMPORIA FAIRFAX FALLS CHURCH
FRANKLIN FREDERICKSBURG HAMPTON
HOPEWELL MANASSAS MANASSAS PARK
NEWPORT NEWS NORFOLK PETERSBURG
POQUOSON PORTSMOUTH RICHMOND
SUFFOLK VIRGINIA BEACH WILLIAMSBURG


ANZ430-431-450-451-452-453-454-455-530-531-532-533-534-535-536-
537-538-539-540-541-542-543-630-631-632-633-634-635-636-637-639-
650-652-654-656-658-210200-
/O.NEW.KWNS.SV.A.0604.260820T1830Z-260821T0200Z/

CW

. ADJACENT COASTAL WATERS INCLUDED ARE

DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE

DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE

COASTAL WATERS FROM SANDY HOOK TO MANASQUAN INLET NJ OUT 20 NM

COASTAL WATERS FROM MANASQUAN INLET TO LITTLE EGG INLET NJ OUT 20
NM

COASTAL WATERS FROM LITTLE EGG INLET TO GREAT EGG INLET NJ OUT 20
NM

COASTAL WATERS FROM GREAT EGG INLET TO CAPE MAY NJ OUT 20 NM

COASTAL WATERS FROM CAPE MAY NJ TO CAPE HENLOPEN DE OUT 20 NM

COASTAL WATERS FROM CAPE HENLOPEN TO FENWICK ISLAND DE OUT 20 NM

CHESAPEAKE BAY NORTH OF POOLES ISLAND MD

CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT MD

CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD

CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD

CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA

TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD

TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD

TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA

PATAPSCO RIVER INCLUDING BALTIMORE HARBOR

CHESTER RIVER TO QUEENSTOWN MD

EASTERN BAY

CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER

PATUXENT RIVER TO BROOMES ISLAND MD

TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH
ISLAND

CHESAPEAKE BAY FROM SMITH POINT TO WINDMILL POINT VA

CHESAPEAKE BAY FROM WINDMILL POINT TO NEW POINT COMFORT VA

CHESAPEAKE BAY FROM NEW POINT COMFORT TO LITTLE CREEK VA

CURRITUCK SOUND

CHESAPEAKE BAY FROM LITTLE CREEK VA TO CAPE HENRY VA INCLUDING
THE CHESAPEAKE BAY BRIDGE TUNNEL

RAPPAHANNOCK RIVER FROM URBANNA TO WINDMILL POINT

YORK RIVER

JAMES RIVER FROM JAMESTOWN TO THE JAMES RIVER BRIDGE

JAMES RIVER FROM JRB TO HRBT INCLUDING THE ELIZABETH RIVER

COASTAL WATERS FROM FENWICK ISLAND DE TO CHINCOTEAGUE VA OUT 20
NM

COASTAL WATERS FROM CHINCOTEAGUE TO PARRAMORE ISLAND VA OUT 20 NM

COASTAL WATERS FROM PARRAMORE ISLAND TO CAPE CHARLES LIGHT VA OUT
20 NM

COASTAL WATERS FROM CAPE CHARLES LIGHT TO VIRGINIA-NORTH CAROLINA
BORDER OUT TO 20 NM

COASTAL WATERS FROM NC VA BORDER TO CURRITUCK BEACH LIGHT NC OUT
20 NM

ATTN...WFO...LWX...AKQ...PHI...CTP...