310
FZUS51 KLWX 212358
CWFLWX
COASTAL WATERS FORECAST
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
757 PM EDT TUE APR 21 2026
TIDAL POTOMAC RIVER AND MARYLAND PORTION OF CHESAPEAKE BAY.
FORECASTS OF WAVE HEIGHTS DO NOT INCLUDE EFFECTS OF WIND DIRECTION
RELATIVE TO TIDAL CURRENTS. EXPECT HIGHER WAVES WHEN WINDS ARE
BLOWING AGAINST THE TIDAL FLOW. WAVES FLAT WHERE WATERS ARE ICED OVER.
ANZ500-220800-
757 PM EDT TUE APR 21 2026
.SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY...
A WARM FRONT WILL LIFT ACROSS THE AREA TONIGHT AS HIGH PRESSURE
MOVES OFFSHORE. A COLD FRONT WILL APPROACH FROM PENNSYLVANIA ON
WEDNESDAY, THEN DROP INTO THE MID-ATLANTIC AND STALL THURSDAY
ROUGHLY SOUTHWEST OF THE POTOMAC RIVER. THE FRONT WILL LIFT BACK
NORTHWARD AS A WARM FRONT FRIDAY INTO SATURDAY, THEN WILL BE
FOLLOWED BY A COLD FRONT SATURDAY NIGHT. SMALL CRAFT ADVISORIES MAY
BE NEEDED FOR PORTIONS OF THE WATERS IN EAST TO SOUTHEAST FLOW
FRIDAY NIGHT INTO SATURDAY.
ANZ535-220800-
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT
S WINDS 10 KT. WAVES 1 FT.
WED
SW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT.
THU
NW WINDS AROUND 5 KT. WAVES 1 FT.
THU NIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI
NE WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING. SHOWERS.
SUN
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY, MAINLY IN
THE MORNING.
ANZ536-220800-
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
WED...SW WINDS 10 TO 15 KT
BECOMING W 5 TO 10 KT LATE. GUSTS UP
TO 20 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
WED NIGHT
NW WINDS 5 TO 10 KT. WAVES 1 FT.
THU
NW WINDS AROUND 5 KT. WAVES 1 FT.
THU NIGHT
W WINDS AROUND 5 KT. WAVES 1 FT.
FRI
NE WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING. SHOWERS.
SUN
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY, MAINLY IN
THE MORNING.
ANZ537-220800-
TIDAL POTOMAC FROM COBB ISLAND TO SMITH POINT-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT...S WINDS 15 TO 20 KT. GUSTS UP TO 20 KT
INCREASING TO
25 KT AFTER MIDNIGHT. WAVES 2 FT.
WED...SW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT
BECOMING W 10 KT
IN THE AFTERNOON. WAVES 2 FT. A CHANCE OF SHOWERS.
WED NIGHT
W WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.
THU
NW WINDS 5 KT. WAVES FLAT.
THU NIGHT
SW WINDS AROUND 5 KT. WAVES FLAT.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 TO 2 FT. A CHANCE OF
SHOWERS.
SAT
E WINDS 10 TO 15 KT. WAVES 2 TO 3 FT. A CHANCE OF SHOWERS IN
THE MORNING. SHOWERS.
SUN
NE WINDS 15 TO 20 KT. WAVES 2 TO 3 FT. SHOWERS LIKELY, MAINLY
IN THE MORNING.
ANZ530-220800-
CHESAPEAKE BAY NORTH OF POOLES ISLAND-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
WED...SW WINDS 5 TO 10 KT WITH GUSTS TO 20 KT
BECOMING N LATE.
WAVES 1 FT. A CHANCE OF SHOWERS.
WED NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT.
THU
NW WINDS AROUND 5 KT. WAVES 1 FT.
THU NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI
NE WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY.
SUN...NE WINDS 10 TO 15 KT
DIMINISHING TO 5 KT AFTER MIDNIGHT.
WAVES 1 FT. SHOWERS LIKELY, MAINLY IN THE MORNING.
ANZ531-220800-
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT...S WINDS 10 TO 15 KT. GUSTS UP TO 20 KT
INCREASING TO
25 KT AFTER MIDNIGHT. WAVES 1 TO 2 FT.
WED...SW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING NE 5 KT
LATE. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS.
WED NIGHT
N WINDS 5 KT. WAVES LESS THAN 1 FT.
THU
NW WINDS 5 KT. WAVES FLAT.
THU NIGHT
NW WINDS AROUND 5 KT. WAVES FLAT.
FRI
NE WINDS 5 KT. WAVES FLAT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
E WINDS 10 TO 15 KT. WAVES 1 TO 2 FT. SHOWERS LIKELY.
SUN
NE WINDS 10 TO 15 KT. WAVES 1 TO 2 FT. SHOWERS LIKELY, MAINLY
IN THE MORNING.
ANZ538-220800-
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT
S WINDS 10 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
WED...SW WINDS 5 TO 10 KT
BECOMING N LATE. WAVES 1 FT. A CHANCE
OF SHOWERS.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES FLAT.
THU
NW WINDS 5 KT. WAVES FLAT.
THU NIGHT
N WINDS AROUND 5 KT. WAVES FLAT.
FRI
E WINDS 5 KT. WAVES FLAT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY.
SUN
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY, MAINLY IN
THE MORNING.
ANZ539-220800-
CHESTER RIVER TO QUEENSTOWN MD-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.
WED...SW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING W 5 KT
IN THE AFTERNOON. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES FLAT.
THU
NW WINDS 5 KT. WAVES FLAT.
THU NIGHT
SE WINDS AROUND 5 KT. WAVES FLAT.
FRI
NE WINDS 5 KT. WAVES FLAT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
E WINDS 10 TO 15 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING. SHOWERS.
SUN
NE WINDS 10 TO 15 KT. WAVES 1 FT. SHOWERS LIKELY, MAINLY IN
THE MORNING.
ANZ532-220800-
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT
S WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 2 TO 3 FT.
WED...SW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING W 5 KT
LATE. WAVES 3 FT...SUBSIDING TO 1 FT IN THE AFTERNOON. A CHANCE OF
SHOWERS.
WED NIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS.
THU
NW WINDS 5 KT. WAVES FLAT.
THU NIGHT
W WINDS 5 KT. WAVES FLAT.
FRI
NE WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
E WINDS 15 TO 20 KT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS IN
THE MORNING, THEN SHOWERS.
SUN...NE WINDS 15 TO 20 KT
DIMINISHING TO 10 KT AFTER MIDNIGHT.
WAVES 1 TO 2 FT. SHOWERS LIKELY, MAINLY IN THE MORNING.
ANZ540-220800-
EASTERN BAY-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT...S WINDS 10 TO 15 KT. GUSTS UP TO 20 KT
INCREASING TO
25 KT AFTER MIDNIGHT. WAVES 1 TO 2 FT.
WED...SW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING W 5 KT
LATE. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
THU
NW WINDS 5 KT. WAVES FLAT.
THU NIGHT
SE WINDS AROUND 5 KT. WAVES FLAT.
FRI
NE WINDS 5 KT. WAVES FLAT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
E WINDS 10 TO 15 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING, THEN SHOWERS.
SUN
NE WINDS 10 TO 15 KT. WAVES 1 FT. SHOWERS LIKELY, MAINLY IN
THE MORNING.
ANZ533-220800-
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT
S WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 2 TO 3 FT.
WED...SW WINDS 10 TO 15 KT WITH GUSTS TO 25 KT
BECOMING W 5 TO
10 KT LATE. WAVES 3 FT...SUBSIDING TO 1 FT IN THE AFTERNOON. A
CHANCE OF SHOWERS.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT.
THU
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
THU NIGHT
W WINDS AROUND 5 KT. WAVES FLAT.
FRI
NE WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
E WINDS 15 TO 20 KT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS IN
THE MORNING, THEN SHOWERS.
SUN
NE WINDS 15 TO 20 KT. WAVES 2 TO 3 FT. SHOWERS LIKELY, MAINLY
IN THE MORNING.
ANZ541-220800-
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT
S WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 1 TO 2 FT.
WED...SW WINDS 10 TO 15 KT WITH GUSTS TO 25 KT
BECOMING W 5 TO
10 KT LATE. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT.
THU
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
THU NIGHT
W WINDS AROUND 5 KT. WAVES FLAT.
FRI
NE WINDS 5 KT. WAVES FLAT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
E WINDS 10 TO 15 KT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS IN
THE MORNING, THEN SHOWERS.
SUN
NE WINDS 15 TO 20 KT. WAVES 1 TO 2 FT. SHOWERS LIKELY, MAINLY
IN THE MORNING.
ANZ542-220800-
PATUXENT RIVER TO BROOMES ISLAND MD-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
WED...SW WINDS 10 TO 15 KT
BECOMING W 5 TO 10 KT IN THE
AFTERNOON. GUSTS UP TO 20 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT.
THU
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
THU NIGHT
SW WINDS AROUND 5 KT. WAVES 1 FT.
FRI
NE WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING. SHOWERS.
SUN
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY, MAINLY IN
THE MORNING.
ANZ534-220800-
CHESAPEAKE BAY FROM DRUM POINT TO SMITH POINT-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT
S WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 2 TO
3 FT...BUILDING TO 4 FT AFTER MIDNIGHT.
WED...SW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT
BECOMING W 10 TO
15 KT IN THE AFTERNOON. WAVES 4 FT... SUBSIDING TO 2 FT IN THE
AFTERNOON. A CHANCE OF SHOWERS.
WED NIGHT
W WINDS 5 TO 10 KT. WAVES 1 FT.
THU
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
THU NIGHT
SW WINDS 5 KT. WAVES LESS THAN 1 FT.
FRI
E WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
E WINDS 10 TO 15 KT. WAVES 1 TO 2 FT. A CHANCE OF
SHOWERS.
SAT
E WINDS 15 TO 20 KT. WAVES 2 TO 3 FT. A CHANCE OF SHOWERS IN
THE MORNING. SHOWERS.
SUN
NE WINDS 15 TO 20 KT. WAVES 3 FT. SHOWERS LIKELY, MAINLY IN
THE MORNING.
ANZ543-220800-
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-
757 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
TONIGHT
S WINDS 15 TO 20 KT. GUSTS UP TO 25 KT LATE THIS EVENING
AND OVERNIGHT. WAVES 1 TO 2 FT...BUILDING TO 3 FT LATE.
WED...SW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT
BECOMING W 5 TO
10 KT LATE. WAVES 2 TO 3 FT. A CHANCE OF SHOWERS.
WED NIGHT
W WINDS 5 TO 10 KT. WAVES 1 FT.
THU
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
THU NIGHT
S WINDS 5 KT. WAVES LESS THAN 1 FT.
FRI
E WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
E WINDS 10 TO 15 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
E WINDS 15 TO 20 KT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS IN
THE MORNING, THEN SHOWERS.
SUN
NE WINDS 15 TO 20 KT. WAVES 2 FT. SHOWERS LIKELY, MAINLY IN
THE MORNING.
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