804
FZUS51 KLWX 212057
CWFLWX
COASTAL WATERS FORECAST
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
457 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-
457 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-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
S WINDS 10 KT. WAVES 1 FT.
TONIGHT
S WINDS 5 TO 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
E WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING. SHOWERS.
ANZ536-220800-
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
S WINDS 10 KT. WAVES 1 FT.
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
E WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING. SHOWERS.
ANZ537-220800-
TIDAL POTOMAC FROM COBB ISLAND TO SMITH POINT-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
SE WINDS 15 KT. WAVES 1 FT.
TONIGHT...S WINDS 10 TO 15 KT WITH GUSTS TO 25 KT
INCREASING TO
15 TO 20 KT WITH GUSTS TO 25 KT LATE. WAVES 2 FT.
WED...SW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT
BECOMING W 10 KT
IN THE AFTERNOON. WAVES 1 TO 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...E WINDS 5 TO 10 KT. WAVES 1 FT OR LESS
BUILDING TO 2 FT
AFTER MIDNIGHT. A CHANCE OF SHOWERS THROUGH THE NIGHT.
SAT
E WINDS 10 TO 15 KT. WAVES 2 TO 3 FT. A CHANCE OF SHOWERS IN
THE MORNING. SHOWERS.
ANZ530-220800-
CHESAPEAKE BAY NORTH OF POOLES ISLAND-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
S WINDS 10 KT. WAVES 1 FT.
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 FLAT.
THU
NW WINDS AROUND 5 KT. WAVES FLAT.
THU NIGHT
N WINDS AROUND 5 KT. WAVES FLAT.
FRI
E WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY.
ANZ531-220800-
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
S WINDS 10 KT. WAVES 1 FT.
TONIGHT...S WINDS 10 TO 15 KT. GUSTS UP TO 20 KT
INCREASING TO
25 KT AFTER MIDNIGHT. WAVES 2 TO 3 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 FLAT.
THU
NW WINDS 5 KT. WAVES FLAT.
THU NIGHT
NW WINDS AROUND 5 KT. WAVES FLAT.
FRI
E WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS.
SAT
E WINDS 10 TO 15 KT. WAVES 1 TO 2 FT. SHOWERS LIKELY.
ANZ538-220800-
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
SE WINDS 10 KT. WAVES 1 FT.
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 OR LESS. A
CHANCE OF SHOWERS.
WED NIGHT
N 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 LESS THAN 1 FT. A CHANCE OF SHOWERS.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY.
ANZ539-220800-
CHESTER RIVER TO QUEENSTOWN MD-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
S WINDS 10 KT. WAVES 1 FT.
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
N WINDS AROUND 5 KT. WAVES FLAT.
THU
NW WINDS 5 KT. WAVES FLAT.
THU NIGHT
SE WINDS AROUND 5 KT. WAVES FLAT.
FRI
E WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS.
SAT
E WINDS 10 TO 15 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING. SHOWERS.
ANZ532-220800-
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
S WINDS 15 KT. WAVES 1 FT.
TONIGHT
S WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 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
E WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. 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.
ANZ540-220800-
EASTERN BAY-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
S WINDS 10 KT. WAVES 1 FT.
TONIGHT
S WINDS 10 TO 15 KT WITH GUSTS TO 25 KT. 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
E WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS.
SAT
E WINDS 10 TO 15 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING, THEN SHOWERS.
ANZ533-220800-
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
SE WINDS 15 KT. WAVES 1 FT.
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
E WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. 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.
ANZ541-220800-
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
S WINDS 10 KT. WAVES 1 FT.
TONIGHT
S WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 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
E WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. 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.
ANZ542-220800-
PATUXENT RIVER TO BROOMES ISLAND MD-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
SE WINDS 10 KT. WAVES 1 FT.
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
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.
ANZ534-220800-
CHESAPEAKE BAY FROM DRUM POINT TO SMITH POINT-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
SE WINDS 15 KT. WAVES 1 FT.
TONIGHT
S WINDS 20 TO 25 KT. WAVES 3 FT.
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 10 TO 15 KT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS
THROUGH THE NIGHT.
SAT
E WINDS 15 TO 20 KT. WAVES 2 TO 3 FT. A CHANCE OF SHOWERS IN
THE MORNING. SHOWERS.
ANZ543-220800-
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-
457 PM EDT TUE APR 21 2026
..SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY MORNING
REST OF THIS AFTERNOON
S WINDS 10 KT. WAVES 1 FT.
TONIGHT
S WINDS 15 TO 20 KT. GUSTS UP TO 25 KT IN THE LATE
EVENING AND OVERNIGHT. WAVES 2 TO 3 FT.
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 10 TO 15 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
SAT
E WINDS 15 TO 20 KT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS IN
THE MORNING, THEN SHOWERS.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page