316
FZUS51 KLWX 180627
CWFLWX
COASTAL WATERS FORECAST
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
226 AM EDT SAT APR 18 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.
ANZ500-182000-
226 AM EDT SAT APR 18 2026
.SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY...
IT WILL REMAIN VERY WARM AND DRY THROUGH TODAY AS HIGH PRESSURE
REMAINS OFF THE SOUTHEASTERN U.S. COAST. A COLD FRONT LATE SATURDAY
NIGHT WILL BRING THE NEXT CHANCE FOR WIDESPREAD SHOWERS. SMALL CRAFT
ADVISORIES ARE IN EFFECT FOR MOST WATERS AT TIMES SATURDAY
AFTERNOON THROUGH SUNDAY EVENING. ADDITIONAL SMALL CRAFT ADVISORIES
ARE POSSIBLE IN NORTHWEST FLOW ON MONDAY.
ANZ535-182000-
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH THIS EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
AFTERNOON...
OVERNIGHT
LIGHT WINDS. WAVES FLAT.
SAT
SE WINDS 10 TO 15 KT WITH GUSTS TO 25 KT. WAVES 1 FT.
SAT NIGHT...SE WINDS 10 TO 15 KT WITH GUSTS TO 25 KT
DIMINISHING
TO 5 KT AFTER MIDNIGHT, THEN BECOMING N LATE. WAVES 1 FT. A CHANCE
OF SHOWERS.
SUN
NW WINDS 15 TO 20 KT WITH GUSTS TO 30 KT. WAVES 1 TO 2 FT.
SHOWERS.
SUN NIGHT
NW WINDS 5 TO 10 KT. GUSTS UP TO 20 KT IN THE EVENING.
WAVES 1 FT.
MON
NW WINDS 5 TO 10 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
MON NIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT.
TUE
SW WINDS AROUND 5 KT. WAVES 1 FT.
WED
W WINDS AROUND 5 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS
THROUGH THE NIGHT.
ANZ536-182000-
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH THIS EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
AFTERNOON...
OVERNIGHT
NE WINDS AROUND 5 KT. WAVES FLAT.
SAT
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.
SAT NIGHT...SE WINDS 10 TO 15 KT
BECOMING W 5 TO 10 KT LATE.
GUSTS UP TO 20 KT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS.
SUN...NW WINDS 20 TO 25 KT
DIMINISHING TO 10 TO 15 KT IN THE
AFTERNOON. GUSTS UP TO 30 KT. WAVES 2 TO 3 FT. SHOWERS.
SUN NIGHT
NW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
MON
NW WINDS 5 TO 10 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
MON NIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT.
TUE...W WINDS AROUND 5 KT
BECOMING S. WAVES 1 FT.
WED...W WINDS 5 TO 10 KT
BECOMING N AFTER MIDNIGHT. WAVES 1 FT. A
CHANCE OF SHOWERS THROUGH THE NIGHT.
ANZ537-182000-
TIDAL POTOMAC FROM COBB ISLAND TO SMITH POINT-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH SUNDAY AFTERNOON...
OVERNIGHT
NE WINDS AROUND 5 KT. WAVES FLAT.
SAT
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.
SAT NIGHT...SE WINDS 15 TO 20 KT
BECOMING SW 10 TO 15 KT LATE.
WAVES 2 FT.
SUN
NW WINDS 15 TO 20 KT WITH GUSTS TO 30 KT. WAVES 3 FT.
SHOWERS.
SUN NIGHT
NW WINDS 5 TO 10 KT. WAVES 1 TO 2 FT. A CHANCE OF
SHOWERS.
MON
NW WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.
MON NIGHT
N WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.
TUE...N WINDS 5 TO 10 KT
BECOMING SE 10 TO 15 KT IN THE AFTERNOON
AND EVENING, THEN BECOMING S AFTER MIDNIGHT. WAVES 1 TO 2 FT.
WED...SW WINDS 10 TO 15 KT
BECOMING NW 5 KT. WAVES 1 TO 2 FT.
ANZ530-182000-
CHESAPEAKE BAY NORTH OF POOLES ISLAND-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH THIS EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
AFTERNOON...
OVERNIGHT
E WINDS 5 KT. WAVES LESS THAN 1 FT.
SAT
SE WINDS 5 TO 10 KT. GUSTS UP TO 20 KT IN THE AFTERNOON.
WAVES 1 FT.
SAT NIGHT...SE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING NE
5 TO 10 KT LATE. WAVES 1 FT. A CHANCE OF SHOWERS.
SUN
NW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 2 FT.
SHOWERS.
SUN NIGHT
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
MON
NW WINDS 5 TO 10 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
MON NIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT.
TUE...W WINDS AROUND 5 KT
BECOMING S. WAVES 1 FT.
WED...SW WINDS 5 TO 10 KT
BECOMING N. WAVES 1 FT.
ANZ531-182000-
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH THIS EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
AFTERNOON...
OVERNIGHT
NE WINDS 5 KT. WAVES FLAT.
SAT
E WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE AFTERNOON.
WAVES 1 TO 2 FT.
SAT NIGHT...SE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING NE
5 TO 10 KT LATE. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS.
SUN
NW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 3 FT.
SHOWERS.
SUN NIGHT...NW WINDS 10 TO 15 KT
BECOMING W 5 TO 10 KT AFTER
MIDNIGHT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS.
MON
NW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.
MON NIGHT
N WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.
TUE...N WINDS 5 KT
BECOMING S 10 TO 15 KT. WAVES 1 TO 2 FT.
WED...SW WINDS 10 TO 15 KT
BECOMING N 5 KT. WAVES 1 FT OR LESS.
ANZ538-182000-
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH THIS EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
AFTERNOON...
OVERNIGHT
NE WINDS 5 KT. WAVES FLAT.
SAT
E WINDS 5 TO 10 KT. GUSTS UP TO 20 KT IN THE AFTERNOON. WAVES
1 FT.
SAT NIGHT...SE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING NE
5 KT AFTER MIDNIGHT. WAVES 1 FT. A CHANCE OF SHOWERS.
SUN
NW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 2 FT.
SHOWERS.
SUN NIGHT
NW WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF
SHOWERS.
MON
NW WINDS 5 TO 10 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
MON NIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.
TUE...E WINDS AROUND 5 KT
BECOMING S. WAVES 1 FT OR LESS.
WED
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
ANZ539-182000-
CHESTER RIVER TO QUEENSTOWN MD-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH THIS EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
AFTERNOON...
OVERNIGHT
NE WINDS 5 KT. WAVES FLAT.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT...SE WINDS 5 TO 10 KT
BECOMING NE LATE. WAVES 1 FT. A
CHANCE OF SHOWERS.
SUN
NW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 3 FT.
SHOWERS.
SUN NIGHT
NW WINDS 5 TO 10 KT. WAVES 1 TO 2 FT. A CHANCE OF
SHOWERS.
MON
NW WINDS 5 TO 10 KT. WAVES 2 FT.
MON NIGHT
N WINDS 5 TO 10 KT. WAVES 1 TO 2 FT.
TUE...W WINDS 5 KT
BECOMING S 10 TO 15 KT. WAVES 1 FT.
WED...SW WINDS 5 TO 10 KT
BECOMING N. WAVES 1 FT OR LESS.
ANZ532-182000-
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH THIS EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
AFTERNOON...
OVERNIGHT
NE WINDS 5 KT. WAVES FLAT.
SAT
SE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.
SAT NIGHT...SE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING NE
5 TO 10 KT LATE. WAVES 2 TO 3 FT. A CHANCE OF SHOWERS.
SUN
NW WINDS 15 TO 20 KT WITH GUSTS TO 30 KT. WAVES 3 FT.
SHOWERS.
SUN NIGHT...NW WINDS 10 TO 15 KT
BECOMING W AFTER MIDNIGHT. WAVES
1 TO 2 FT. A CHANCE OF SHOWERS.
MON
NW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.
MON NIGHT
N WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO
2 FT.
TUE...N WINDS 5 TO 10 KT
BECOMING S 10 TO 15 KT. WAVES 1 TO 2 FT.
WED...SW WINDS 10 TO 15 KT
BECOMING N 5 KT. WAVES 1 TO 2 FT.
ANZ540-182000-
EASTERN BAY-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH THIS EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
AFTERNOON...
OVERNIGHT
NE WINDS 5 KT. WAVES FLAT.
SAT
SE WINDS 5 TO 10 KT. GUSTS UP TO 20 KT IN THE AFTERNOON.
WAVES 1 FT.
SAT NIGHT...SE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING NE
5 TO 10 KT LATE. WAVES 1 FT. A CHANCE OF SHOWERS.
SUN
NW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 2 FT.
SHOWERS.
SUN NIGHT
NW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
MON
NW WINDS 5 TO 10 KT. WAVES 1 FT.
MON NIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT.
TUE...N WINDS 5 KT
BECOMING S 10 TO 15 KT. WAVES 1 FT.
WED...SW WINDS 10 TO 15 KT
BECOMING N 5 KT. WAVES 1 FT OR LESS.
ANZ533-182000-
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH THIS EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
AFTERNOON...
OVERNIGHT
NE WINDS 5 KT. WAVES FLAT.
SAT
SE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.
SAT NIGHT...SE WINDS 15 TO 20 KT
BECOMING W 10 TO 15 KT LATE.
WAVES 2 TO 3 FT. A CHANCE OF SHOWERS.
SUN
NW WINDS 20 TO 25 KT WITH GUSTS TO 30 KT. WAVES 3 FT.
SHOWERS.
SUN NIGHT
NW WINDS 5 TO 10 KT. WAVES 1 TO 2 FT. A CHANCE OF
SHOWERS.
MON
NW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.
MON NIGHT
N WINDS 10 TO 15 KT. WAVES 2 FT.
TUE...N WINDS 5 TO 10 KT
BECOMING SE 10 TO 15 KT IN THE AFTERNOON
AND EVENING, THEN BECOMING S AFTER MIDNIGHT. WAVES 1 TO 2 FT.
WED...SW WINDS 10 TO 15 KT
BECOMING N 5 TO 10 KT. WAVES 1 TO
2 FT.
ANZ541-182000-
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH THIS EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
AFTERNOON...
OVERNIGHT
NE WINDS 5 KT. WAVES FLAT.
SAT
SE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
SAT NIGHT...SE WINDS 10 TO 15 KT
BECOMING SW LATE. GUSTS UP TO
20 KT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS.
SUN
NW WINDS 15 TO 20 KT WITH GUSTS TO 30 KT. WAVES 3 FT.
SHOWERS.
SUN NIGHT
NW WINDS 5 TO 10 KT. WAVES 1 TO 2 FT. A CHANCE OF
SHOWERS.
MON
NW WINDS 10 TO 15 KT. WAVES 2 FT.
MON NIGHT
N WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.
TUE...N WINDS 5 TO 10 KT
BECOMING S 10 TO 15 KT. WAVES 1 TO 2 FT.
WED...SW WINDS 10 TO 15 KT
BECOMING N 5 KT. WAVES 1 TO 2 FT.
ANZ542-182000-
PATUXENT RIVER TO BROOMES ISLAND MD-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH THIS EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
AFTERNOON...
OVERNIGHT
N WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
SAT...E WINDS 5 KT
BECOMING SE 10 TO 15 KT WITH GUSTS TO 20 KT IN
THE AFTERNOON. WAVES 1 FT.
SAT NIGHT...SE WINDS 10 TO 15 KT
BECOMING SW 5 TO 10 KT LATE.
GUSTS UP TO 20 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SUN
NW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 1 FT.
SHOWERS.
SUN NIGHT
NW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
MON
NW WINDS 5 TO 10 KT. WAVES 1 FT.
MON NIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT.
TUE...E WINDS 5 KT
BECOMING S. WAVES 1 FT.
WED...W WINDS 5 TO 10 KT
BECOMING N AFTER MIDNIGHT. WAVES 1 FT.
ANZ534-182000-
CHESAPEAKE BAY FROM DRUM POINT TO SMITH POINT-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH SUNDAY AFTERNOON...
OVERNIGHT
N WINDS 5 KT. WAVES FLAT.
SAT...E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING SE WITH
GUSTS TO 20 KT LATE. WAVES 1 FT... BUILDING TO 3 FT IN THE
AFTERNOON.
SAT NIGHT...SE WINDS 15 KT
BECOMING S LATE. GUSTS UP TO 20 KT.
WAVES 3 FT.
SUN
NW WINDS 20 TO 25 KT WITH GUSTS TO 30 KT. WAVES 4 FT.
SHOWERS.
SUN NIGHT
NW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT. A
CHANCE OF SHOWERS.
MON
NW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.
MON NIGHT
N WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.
TUE...N WINDS 5 TO 10 KT
BECOMING S IN THE AFTERNOON, THEN
INCREASING TO 15 TO 20 KT. WAVES 1 TO 2 FT... BUILDING TO 3 FT AFTER
MIDNIGHT.
WED...SW WINDS 15 TO 20 KT
BECOMING W 5 TO 10 KT IN THE AFTERNOON
AND EVENING, THEN BECOMING N AFTER MIDNIGHT. WAVES 2 TO 3 FT...
SUBSIDING TO 1 FT.
ANZ543-182000-
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-
226 AM EDT SAT APR 18 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM 2 PM EDT THIS AFTERNOON
THROUGH SUNDAY AFTERNOON...
OVERNIGHT
N WINDS 5 KT. WAVES FLAT.
SAT...E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING SE WITH
GUSTS TO 20 KT LATE. WAVES 1 FT.
SAT NIGHT...SE WINDS 10 TO 15 KT
BECOMING S LATE. GUSTS UP TO
20 KT. WAVES 2 FT.
SUN
NW WINDS 20 TO 25 KT WITH GUSTS TO 30 KT. WAVES 2 TO 3 FT.
SHOWERS LIKELY.
SUN NIGHT
NW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO
2 FT. SHOWERS LIKELY.
MON
NW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
MON NIGHT
N WINDS 10 TO 15 KT. WAVES 1 FT.
TUE...N WINDS 5 TO 10 KT
BECOMING SW 15 TO 20 KT. WAVES 1 TO
2 FT.
WED...SW WINDS 15 TO 20 KT
DIMINISHING TO 5 TO 10 KT IN THE
AFTERNOON AND EVENING, THEN BECOMING N AFTER MIDNIGHT. WAVES 1 TO
2 FT.
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