741
FZUS51 KLWX 210857
CWFLWX
COASTAL WATERS FORECAST
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
457 AM 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.
ANZ500-212300-
457 AM EDT TUE APR 21 2026
.SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY...
HIGH PRESSURE WILL BUILD IN TODAY. A WEAK COLD FRONT LOOKS TO DROP
IN FROM THE NORTH WEDNESDAY, THEN CROSS THE MID-ATLANTIC BY
THURSDAY. SMALL CRAFT ADVISORIES MAY BE NEEDED WEDNESDAY IN A SOUTH
TO SOUTHWEST FLOW. ADDITIONAL SMALL CRAFT ADVISORIES ARE POSSIBLE
LATER THIS WEEK AND WEEKEND AS MULTIPLE FRONTS AND WAVES OF LOW
PRESSURE TRAVERSE THE REGION.
ANZ535-212300-
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD-
457 AM EDT TUE APR 21 2026
REST OF THE OVERNIGHT
N WINDS 5 KT. WAVES LESS THAN 1 FT.
TODAY
S WINDS AROUND 5 KT. WAVES 1 FT.
TONIGHT
S WINDS 5 TO 10 KT. WAVES 1 FT.
WED
SW WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY.
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 THROUGH
THE NIGHT.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING. SHOWERS LIKELY.
ANZ536-212300-
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND-
457 AM EDT TUE APR 21 2026
REST OF THE OVERNIGHT
NE WINDS 10 KT. WAVES 1 FT.
TODAY...E WINDS AROUND 5 KT
BECOMING S LATE. WAVES 1 FT.
TONIGHT
S WINDS 10 TO 15 KT. WAVES 1 FT.
WED
SW WINDS 10 TO 15 KT. WAVES 1 FT. SHOWERS LIKELY.
WED NIGHT
W WINDS AROUND 5 KT. WAVES 1 FT.
THU
NW WINDS AROUND 5 KT. WAVES 1 FT.
THU NIGHT
S WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI
E WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING. SHOWERS LIKELY.
ANZ537-212300-
TIDAL POTOMAC FROM COBB ISLAND TO SMITH POINT-
457 AM EDT TUE APR 21 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
WEDNESDAY MORNING...
REST OF THE OVERNIGHT
NE WINDS 10 KT. WAVES 2 FT.
TODAY...NE WINDS 5 TO 10 KT
BECOMING SE LATE. WAVES 1 FT.
TONIGHT
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.
WED...SW WINDS 10 TO 15 KT
BECOMING W 5 TO 10 KT IN THE
AFTERNOON. GUSTS UP TO 20 KT. WAVES 1 TO 2 FT. SHOWERS LIKELY.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
THU
NW WINDS 5 KT. WAVES FLAT.
THU NIGHT
S WINDS AROUND 5 KT. WAVES FLAT.
FRI...NE WINDS AROUND 5 KT
BECOMING SE. WAVES 1 FT OR LESS. A
CHANCE OF SHOWERS THROUGH THE NIGHT.
SAT...E WINDS 10 TO 15 KT
BECOMING NE AFTER MIDNIGHT. WAVES 1 TO
2 FT...BUILDING TO 3 FT AFTER MIDNIGHT. A CHANCE OF SHOWERS IN THE
AFTERNOON. SHOWERS LIKELY THROUGH THE NIGHT.
ANZ530-212300-
CHESAPEAKE BAY NORTH OF POOLES ISLAND-
457 AM EDT TUE APR 21 2026
REST OF THE OVERNIGHT
NE WINDS 10 KT. WAVES 1 FT.
TODAY...N WINDS 5 KT
BECOMING S LATE. WAVES 1 FT.
TONIGHT
S WINDS 5 TO 10 KT. WAVES 1 FT.
WED
SW WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES FLAT.
THU
NW WINDS AROUND 5 KT. WAVES FLAT.
THU NIGHT
NW WINDS AROUND 5 KT. WAVES FLAT.
FRI
E WINDS AROUND 5 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS
THROUGH THE NIGHT.
SAT
E WINDS 10 TO 15 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING, THEN SHOWERS LIKELY.
ANZ531-212300-
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT-
457 AM EDT TUE APR 21 2026
REST OF THE OVERNIGHT
NE WINDS 10 KT. WAVES 1 FT.
TODAY...NE WINDS 5 TO 10 KT
BECOMING SE IN THE AFTERNOON. WAVES
1 FT.
TONIGHT
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.
WED...SW WINDS 10 TO 15 KT
DIMINISHING TO 5 KT IN THE AFTERNOON.
WAVES 1 TO 2 FT. SHOWERS LIKELY.
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 TO 2 FT. A CHANCE OF SHOWERS IN
THE MORNING, THEN SHOWERS LIKELY.
ANZ538-212300-
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-
457 AM EDT TUE APR 21 2026
REST OF THE OVERNIGHT
NE WINDS 5 KT. WAVES LESS THAN 1 FT.
TODAY...NE WINDS 5 KT
BECOMING SE IN THE AFTERNOON. WAVES 1 FT.
TONIGHT
S WINDS 5 TO 10 KT. WAVES 1 FT.
WED
SW WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. SHOWERS LIKELY.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES FLAT.
THU
NW WINDS 5 KT. WAVES FLAT.
THU NIGHT
NW WINDS AROUND 5 KT. WAVES FLAT.
FRI
E WINDS AROUND 5 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING. SHOWERS LIKELY.
ANZ539-212300-
CHESTER RIVER TO QUEENSTOWN MD-
457 AM EDT TUE APR 21 2026
REST OF THE OVERNIGHT
NE WINDS 10 KT. WAVES 1 FT.
TODAY...NE WINDS 5 TO 10 KT
BECOMING S IN THE AFTERNOON. 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
DIMINISHING TO 5 KT IN THE AFTERNOON.
WAVES 1 TO 2 FT. SHOWERS LIKELY.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES FLAT.
THU
NW WINDS AROUND 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
THROUGH THE NIGHT.
SAT
E WINDS 10 TO 15 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING, THEN SHOWERS LIKELY.
ANZ532-212300-
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH-
457 AM EDT TUE APR 21 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
WEDNESDAY MORNING...
REST OF THE OVERNIGHT
NE WINDS 10 KT. WAVES 2 FT.
TODAY...NE WINDS 5 TO 10 KT
BECOMING SE IN THE AFTERNOON. WAVES
1 FT.
TONIGHT
S WINDS 15 TO 20 KT. WAVES 2 TO 3 FT.
WED
SW WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE MORNING. WAVES
3 FT...SUBSIDING TO 1 FT IN THE AFTERNOON. SHOWERS LIKELY.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
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 10 TO 15 KT
BECOMING NE 15 TO 20 KT AFTER MIDNIGHT.
WAVES 1 TO 2 FT. A CHANCE OF SHOWERS IN THE MORNING, THEN SHOWERS
LIKELY.
ANZ540-212300-
EASTERN BAY-
457 AM EDT TUE APR 21 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
WEDNESDAY MORNING...
REST OF THE OVERNIGHT
NE WINDS 10 KT. WAVES 1 FT.
TODAY...NE WINDS 5 TO 10 KT
BECOMING S IN THE AFTERNOON. 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. GUSTS UP TO 20 KT IN THE MORNING. WAVES
1 TO 2 FT. SHOWERS LIKELY.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
THU
NW WINDS AROUND 5 KT. WAVES FLAT.
THU NIGHT
S WINDS AROUND 5 KT. WAVES FLAT.
FRI
E WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS
THROUGH THE NIGHT.
SAT
E WINDS 10 TO 15 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING, THEN SHOWERS LIKELY.
ANZ533-212300-
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT-
457 AM EDT TUE APR 21 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
WEDNESDAY MORNING...
REST OF THE OVERNIGHT
NE WINDS 10 KT. WAVES 2 FT.
TODAY...NE WINDS 5 TO 10 KT
BECOMING SE LATE. WAVES 1 FT.
TONIGHT
S WINDS 15 TO 20 KT. WAVES 2 TO 3 FT.
WED...SW WINDS 15 TO 20 KT
BECOMING W 5 TO 10 KT IN THE
AFTERNOON. WAVES 3 FT...SUBSIDING TO 1 FT IN THE AFTERNOON. SHOWERS
LIKELY.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
THU
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
THU NIGHT
SW WINDS AROUND 5 KT. WAVES FLAT.
FRI...NE WINDS 5 KT
BECOMING SE. WAVES 1 FT OR LESS. A CHANCE OF
SHOWERS THROUGH THE NIGHT.
SAT...E WINDS 10 TO 15 KT
BECOMING NE 15 TO 20 KT AFTER MIDNIGHT.
WAVES 1 TO 2 FT. A CHANCE OF SHOWERS IN THE MORNING, THEN SHOWERS
LIKELY.
ANZ541-212300-
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-
457 AM EDT TUE APR 21 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
WEDNESDAY MORNING...
REST OF THE OVERNIGHT
NE WINDS 10 KT. WAVES 1 FT.
TODAY...NE WINDS 5 TO 10 KT
BECOMING S IN THE AFTERNOON. WAVES
1 FT.
TONIGHT
S WINDS 15 TO 20 KT. WAVES 1 TO 2 FT.
WED
SW WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE MORNING. WAVES
1 TO 2 FT. SHOWERS LIKELY.
WED NIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
THU
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
THU NIGHT
S WINDS AROUND 5 KT. WAVES FLAT.
FRI
E WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS
THROUGH THE NIGHT.
SAT...E WINDS 10 TO 15 KT
BECOMING NE 15 TO 20 KT AFTER MIDNIGHT.
WAVES 1 TO 2 FT. A CHANCE OF SHOWERS IN THE MORNING, THEN SHOWERS
LIKELY.
ANZ542-212300-
PATUXENT RIVER TO BROOMES ISLAND MD-
457 AM EDT TUE APR 21 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
WEDNESDAY MORNING...
REST OF THE OVERNIGHT
NE WINDS 10 KT. WAVES 1 FT.
TODAY...NE WINDS 5 KT
BECOMING SE LATE. 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 WITH GUSTS TO 20 KT
BECOMING W 5 TO
10 KT IN THE AFTERNOON. WAVES 1 FT. SHOWERS LIKELY.
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 AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING, THEN SHOWERS LIKELY.
ANZ534-212300-
CHESAPEAKE BAY FROM DRUM POINT TO SMITH POINT-
457 AM EDT TUE APR 21 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
WEDNESDAY MORNING...
REST OF THE OVERNIGHT
NE WINDS 15 KT. WAVES 2 FT.
TODAY...NE WINDS 5 TO 10 KT
BECOMING SE LATE. WAVES 1 TO 2 FT.
TONIGHT
S WINDS 15 TO 20 KT. GUSTS UP TO 25 KT. WAVES 3 FT.
WED...SW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT
BECOMING W 5 TO
10 KT IN THE AFTERNOON. WAVES 2 TO 3 FT. SHOWERS LIKELY.
WED NIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
THU
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
THU NIGHT
S WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI
E WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
SAT...E WINDS 10 TO 15 KT
BECOMING NE 15 TO 20 KT AFTER MIDNIGHT.
WAVES 2 TO 3 FT. A CHANCE OF SHOWERS IN THE AFTERNOON. SHOWERS
LIKELY THROUGH THE NIGHT.
ANZ543-212300-
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-
457 AM EDT TUE APR 21 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH
WEDNESDAY MORNING...
REST OF THE OVERNIGHT
NE WINDS 15 KT WITH GUSTS TO 20 KT. WAVES
1 FT.
TODAY...N WINDS 5 TO 10 KT
BECOMING SW IN THE AFTERNOON. WAVES
1 FT.
TONIGHT
S WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 2 FT.
WED...SW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT
BECOMING W 5 TO
10 KT IN THE AFTERNOON. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS.
WED NIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
THU
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
THU NIGHT
SW WINDS 5 KT. WAVES LESS THAN 1 FT.
FRI
SE WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS
THROUGH THE NIGHT.
SAT...E WINDS 10 TO 15 KT
BECOMING NE 15 TO 20 KT AFTER MIDNIGHT.
WAVES 1 TO 2 FT. A CHANCE OF SHOWERS IN THE AFTERNOON. SHOWERS
LIKELY THROUGH THE NIGHT.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page