421
FZUS51 KLWX 180534
CWFLWX
COASTAL WATERS FORECAST
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
134 AM EDT THU SEP 18 2025
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-
134 AM EDT THU SEP 18 2025
.SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY...
AN AREA OF LOW PRESSURE OVER THE VIRGINIA TIDEWATER WILL DISSIPATE
TODAY, WITH WEAK HIGH PRESSURE BUILDING OVER THE REGION. A COLD
FRONT WILL MOVE ACROSS THE WATERS FRIDAY NIGHT. SMALL CRAFT
ADVISORIES FOR NORTHERLY CHANNELING ARE POSSIBLE FRIDAY NIGHT INTO
SATURDAY MORNING, AND AGAIN SATURDAY EVENING FOR PARTS OF THE
WATERS.
ANZ535-182000-
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD-
134 AM EDT THU SEP 18 2025
OVERNIGHT
N WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY
1 TO 3 NM.
THU
NW WINDS AROUND 5 KT. WAVES 1 FT.
THU NIGHT
SW WINDS AROUND 5 KT. WAVES 1 FT.
FRI
NW WINDS AROUND 5 KT. WAVES 1 FT.
FRI NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
E WINDS 5 KT. WAVES LESS THAN 1 FT.
SUN
E WINDS AROUND 5 KT. WAVES 1 FT.
MON
SE WINDS AROUND 5 KT. WAVES 1 FT.
ANZ536-182000-
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND-
134 AM EDT THU SEP 18 2025
OVERNIGHT
N WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY
1 TO 3 NM.
THU
NW WINDS AROUND 5 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
THU NIGHT
SW WINDS AROUND 5 KT. WAVES 1 FT.
FRI
NW WINDS AROUND 5 KT. WAVES 1 FT.
FRI NIGHT
SE WINDS AROUND 5 KT. WAVES 1 FT.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT.
SUN
E WINDS 5 TO 10 KT. WAVES 1 FT.
MON
SE WINDS AROUND 5 KT. WAVES 1 FT.
ANZ537-182000-
TIDAL POTOMAC FROM COBB ISLAND TO SMITH POINT-
134 AM EDT THU SEP 18 2025
OVERNIGHT
N WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY
1 TO 3 NM.
THU
NW WINDS 5 TO 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
THU NIGHT
SW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI
W WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI NIGHT...S WINDS AROUND 5 KT
BECOMING NW AFTER MIDNIGHT. WAVES
FLAT.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
E WINDS 10 KT. WAVES 2 FT.
SUN
E WINDS 5 TO 10 KT. WAVES 1 TO 2 FT.
MON...E WINDS 5 TO 10 KT
BECOMING S AFTER MIDNIGHT. WAVES 1 FT.
ANZ530-182000-
CHESAPEAKE BAY NORTH OF POOLES ISLAND-
134 AM EDT THU SEP 18 2025
OVERNIGHT
N 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
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
FRI NIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT.
SUN
E WINDS 5 TO 10 KT. WAVES 1 FT.
MON
S WINDS 5 KT. WAVES LESS THAN 1 FT.
ANZ531-182000-
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT-
134 AM EDT THU SEP 18 2025
OVERNIGHT
N WINDS 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
THU...N WINDS 5 TO 10 KT
BECOMING S LATE. WAVES 1 FT OR LESS.
THU NIGHT
SW WINDS 5 KT. WAVES LESS THAN 1 FT.
FRI
W WINDS 5 KT. WAVES FLAT.
FRI NIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
E WINDS 10 KT. WAVES 1 FT.
SUN
E WINDS 5 TO 10 KT. WAVES 1 FT.
MON
SE WINDS 5 TO 10 KT. WAVES 1 FT.
ANZ538-182000-
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-
134 AM EDT THU SEP 18 2025
OVERNIGHT
N WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY
1 TO 3 NM.
THU
NW WINDS 5 KT. WAVES FLAT.
THU NIGHT
SW WINDS AROUND 5 KT. WAVES FLAT.
FRI
NW WINDS 5 KT. WAVES FLAT.
FRI NIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT.
SUN
E WINDS 5 TO 10 KT. WAVES 1 FT.
MON
SE WINDS 5 KT. WAVES LESS THAN 1 FT.
ANZ539-182000-
CHESTER RIVER TO QUEENSTOWN MD-
134 AM EDT THU SEP 18 2025
OVERNIGHT
NE 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
W WINDS AROUND 5 KT. WAVES FLAT.
FRI NIGHT...S WINDS AROUND 5 KT
BECOMING NE AFTER MIDNIGHT. WAVES
1 FT OR LESS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT.
SUN
E WINDS 5 TO 10 KT. WAVES 1 FT.
MON
S WINDS 5 KT. WAVES LESS THAN 1 FT.
ANZ532-182000-
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH-
134 AM EDT THU SEP 18 2025
OVERNIGHT
N WINDS 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
THU...N WINDS 5 TO 10 KT
BECOMING S LATE. WAVES 1 FT.
THU NIGHT
SW WINDS 5 TO 10 KT. WAVES 1 FT.
FRI
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
FRI NIGHT...S WINDS 5 KT
BECOMING NE AFTER MIDNIGHT. WAVES 1 FT
OR LESS.
SAT
NE WINDS 10 KT. WAVES 1 FT.
SAT NIGHT
E WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.
SUN
E WINDS 5 TO 10 KT. WAVES 1 FT.
MON
SE WINDS 5 TO 10 KT. WAVES 1 FT.
ANZ540-182000-
EASTERN BAY-
134 AM EDT THU SEP 18 2025
OVERNIGHT
NE WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY
1 TO 3 NM.
THU
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
THU NIGHT
SW WINDS 5 KT. WAVES LESS THAN 1 FT.
FRI
W WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI NIGHT...S WINDS AROUND 5 KT
BECOMING NE AFTER MIDNIGHT. WAVES
1 FT OR LESS.
SAT
NE WINDS 10 KT. WAVES 1 FT.
SAT NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT.
SUN
E WINDS 5 TO 10 KT. WAVES 1 FT.
MON
SE WINDS 5 KT. WAVES LESS THAN 1 FT.
ANZ533-182000-
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT-
134 AM EDT THU SEP 18 2025
OVERNIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO
3 NM.
THU...N WINDS 5 TO 10 KT
BECOMING SW LATE. WAVES 1 FT.
THU NIGHT
SW WINDS 5 TO 10 KT. WAVES 1 FT.
FRI
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
FRI NIGHT...S WINDS 5 KT
BECOMING NE AFTER MIDNIGHT. WAVES 1 FT
OR LESS.
SAT
NE WINDS 10 KT. WAVES 1 TO 2 FT.
SAT NIGHT
E WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.
SUN
E WINDS 5 TO 10 KT. WAVES 1 FT.
MON
SE WINDS 5 TO 10 KT. WAVES 1 FT.
ANZ541-182000-
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-
134 AM EDT THU SEP 18 2025
OVERNIGHT
NE WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY
1 TO 3 NM.
THU...N WINDS 5 TO 10 KT
BECOMING W LATE. WAVES 1 FT.
THU NIGHT
SW WINDS 5 TO 10 KT. WAVES 1 FT.
FRI
W WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI NIGHT...S WINDS AROUND 5 KT
BECOMING NE AFTER MIDNIGHT. WAVES
1 FT OR LESS.
SAT
NE WINDS 10 KT. WAVES 1 FT.
SAT NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT.
SUN
E WINDS 5 TO 10 KT. WAVES 1 FT.
MON
SE WINDS 5 TO 10 KT. WAVES 1 FT.
ANZ542-182000-
PATUXENT RIVER TO BROOMES ISLAND MD-
134 AM EDT THU SEP 18 2025
OVERNIGHT
N WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY
1 TO 3 NM.
THU
NW WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY 1 TO
3 NM.
THU NIGHT
SW WINDS 5 KT. WAVES LESS THAN 1 FT.
FRI
NW WINDS AROUND 5 KT. WAVES 1 FT.
FRI NIGHT
E WINDS AROUND 5 KT. WAVES 1 FT.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT.
SUN
E WINDS 5 TO 10 KT. WAVES 1 FT.
MON
SE WINDS 5 KT. WAVES LESS THAN 1 FT.
ANZ534-182000-
CHESAPEAKE BAY FROM DRUM POINT TO SMITH POINT-
134 AM EDT THU SEP 18 2025
OVERNIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO
3 NM.
THU
NW WINDS 5 TO 10 KT. WAVES 1 FT.
THU NIGHT
SW WINDS 5 TO 10 KT. WAVES 1 FT.
FRI
W WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT...S WINDS 5 KT
BECOMING W AFTER MIDNIGHT. WAVES 1 FT OR
LESS.
SAT
NE WINDS 10 KT. WAVES 1 FT.
SAT NIGHT
E WINDS 10 TO 15 KT. WAVES 2 FT.
SUN
E WINDS 10 KT. WAVES 1 TO 2 FT.
MON...SE WINDS 5 TO 10 KT
BECOMING S AFTER MIDNIGHT. WAVES 1 FT.
ANZ543-182000-
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-
134 AM EDT THU SEP 18 2025
OVERNIGHT
N WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY
1 TO 3 NM.
THU
NW WINDS 5 TO 10 KT. WAVES 1 FT.
THU NIGHT
SW WINDS 5 TO 10 KT. WAVES 1 FT.
FRI
W WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
SW WINDS 5 TO 10 KT. WAVES FLAT.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
E WINDS 10 TO 15 KT. WAVES 1 FT.
SUN
E WINDS 5 TO 10 KT. WAVES 1 FT.
MON...SE WINDS 5 TO 10 KT
BECOMING S AFTER MIDNIGHT. WAVES 1 FT.
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