535
FZUS51 KLWX 180436
CWFLWX
COASTAL WATERS FORECAST
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1236 AM EDT TUE AUG 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-
1236 AM EDT TUE AUG 18 2026
.SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY...
HIGH PRESSURE WILL GRADUALLY BUILD IN FROM THE OHIO RIVER VALLEY
THROUGH TONIGHT WHILE A WEAKENING COLD FRONT STALLS TO THE SOUTH
OVER THE CAROLINAS. HIGH PRESSURE WILL MOVE OVERHEAD WEDNESDAY, THEN
MOVE OFFSHORE WEDNESDAY NIGHT AS A COLD FRONT APPROACHES FROM THE
GREAT LAKES. THE COLD FRONT WILL CROSS THE MID-ATLANTIC THURSDAY,
THEN LINGER NEARBY FRIDAY INTO THE WEEKEND AS ONE OR MORE WAVES OF
LOW PRESSURE RIDE ALONG THE FRONT STALLED NEAR THE COAST.
ANZ535-182000-
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT
W WINDS 5 KT. WAVES LESS THAN 1 FT.
TUE
N WINDS 5 KT. WAVES LESS THAN 1 FT.
TUE NIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
WED
NW WINDS AROUND 5 KT. WAVES 1 FT.
WED NIGHT
SW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
THU
W WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY WITH A CHANCE
OF TSTMS.
THU NIGHT
NE WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
FRI
NE WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
AFTERNOON. SHOWERS LIKELY WITH A CHANCE OF TSTMS THROUGH THE NIGHT.
SAT
E WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ536-182000-
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TUE
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TUE NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT.
WED
NW WINDS AROUND 5 KT. WAVES 1 FT.
WED NIGHT
S WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
THU
SE WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
THU NIGHT
NE WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
FRI
NE WINDS AROUND 5 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS
IN THE AFTERNOON. A CHANCE OF TSTMS. SHOWERS LIKELY THROUGH THE
NIGHT.
SAT
NE WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ537-182000-
TIDAL POTOMAC FROM COBB ISLAND TO SMITH POINT-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT
W WINDS 5 KT. WAVES FLAT. SCATTERED SHOWERS WITH
ISOLATED TSTMS.
TUE
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TUE NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
WED
NW WINDS AROUND 5 KT. WAVES FLAT.
WED NIGHT
S WINDS 5 TO 10 KT. WAVES 1 FT.
THU
S WINDS AROUND 5 KT. WAVES 1 FT OR LESS. SHOWERS WITH A
CHANCE OF TSTMS.
THU NIGHT
S WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS LIKELY WITH
A CHANCE OF TSTMS.
FRI
NE WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS
THROUGH THE DAY. A CHANCE OF TSTMS. SHOWERS LIKELY THROUGH THE
NIGHT.
SAT
NW WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS IN
THE MORNING, THEN SHOWERS LIKELY THROUGH THE NIGHT. A CHANCE OF
SHOWERS AFTER MIDNIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ530-182000-
CHESAPEAKE BAY NORTH OF POOLES ISLAND-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT...W WINDS 5 KT
BECOMING N LATE. WAVES 1 FT.
TUE
N WINDS 5 TO 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
TUE NIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT.
WED
W WINDS AROUND 5 KT. WAVES 1 FT.
WED NIGHT
SW WINDS AROUND 5 KT. WAVES 1 FT.
THU
NW WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS WITH A CHANCE OF
TSTMS.
THU NIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND
TSTMS.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS. A
CHANCE OF TSTMS THROUGH THE NIGHT.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ531-182000-
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT
NW WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.
TUE
N WINDS 5 TO 10 KT. WAVES 1 FT.
TUE NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
WED
W WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
WED NIGHT
SW WINDS 5 KT. WAVES LESS THAN 1 FT.
THU
W WINDS 5 KT. WAVES FLAT. SHOWERS LIKELY WITH A CHANCE OF
TSTMS.
THU NIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND
TSTMS.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
AFTERNOON. SHOWERS LIKELY WITH A CHANCE OF TSTMS THROUGH THE NIGHT.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ538-182000-
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT
NW WINDS 5 KT. WAVES FLAT.
TUE
N WINDS 5 KT. WAVES FLAT.
TUE NIGHT
NW WINDS AROUND 5 KT. WAVES FLAT.
WED
W WINDS 5 KT. WAVES FLAT.
WED NIGHT
SW WINDS 5 KT. WAVES FLAT.
THU
E WINDS 5 KT. WAVES FLAT. SHOWERS LIKELY WITH A CHANCE OF
TSTMS.
THU NIGHT
N WINDS 5 KT. WAVES FLAT. A CHANCE OF SHOWERS AND
TSTMS.
FRI
NE WINDS AROUND 5 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS
IN THE AFTERNOON. SHOWERS LIKELY WITH A CHANCE OF TSTMS THROUGH THE
NIGHT.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ539-182000-
CHESTER RIVER TO QUEENSTOWN MD-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT
NW WINDS 5 KT. WAVES FLAT.
TUE
N WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY 1 TO
3 NM.
TUE NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
WED
W WINDS AROUND 5 KT. WAVES FLAT.
WED NIGHT
SW WINDS AROUND 5 KT. WAVES FLAT.
THU
NW WINDS 5 KT. WAVES FLAT. SHOWERS LIKELY WITH A CHANCE OF
TSTMS.
THU NIGHT
NE WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. SHOWERS LIKELY
WITH A CHANCE OF TSTMS.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS
IN THE AFTERNOON. SHOWERS LIKELY WITH A CHANCE OF TSTMS THROUGH THE
NIGHT.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS LIKELY, MAINLY IN
THE MORNING.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ532-182000-
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TUE
N WINDS 5 TO 10 KT. WAVES 1 FT.
TUE NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
WED
W WINDS 5 KT. WAVES LESS THAN 1 FT.
WED NIGHT
SW WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS.
THU...NW WINDS 5 KT
BECOMING E IN THE AFTERNOON. WAVES 1 FT.
SHOWERS LIKELY WITH A CHANCE OF TSTMS.
THU NIGHT
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
AFTERNOON. SHOWERS LIKELY WITH A CHANCE OF TSTMS THROUGH THE NIGHT.
SAT...NE WINDS 5 KT
BECOMING S. WAVES 1 FT. A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ540-182000-
EASTERN BAY-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT
NW WINDS 5 KT. WAVES FLAT.
TUE
N WINDS 5 TO 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
TUE NIGHT
N WINDS AROUND 5 KT. WAVES FLAT.
WED
W WINDS AROUND 5 KT. WAVES FLAT.
WED NIGHT
SW WINDS AROUND 5 KT. WAVES 1 FT OR LESS. A CHANCE OF
SHOWERS.
THU
W WINDS 5 KT. WAVES FLAT. SHOWERS LIKELY WITH A CHANCE OF
TSTMS.
THU NIGHT
NE WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. SHOWERS LIKELY
WITH A CHANCE OF TSTMS.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS
IN THE AFTERNOON. SHOWERS LIKELY WITH A CHANCE OF TSTMS THROUGH THE
NIGHT.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS LIKELY, MAINLY IN
THE MORNING.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ533-182000-
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT
W WINDS 5 KT. WAVES LESS THAN 1 FT.
TUE
N WINDS 5 TO 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
TUE NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
WED
W WINDS 5 KT. WAVES FLAT.
WED NIGHT
S WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
THU
S WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY WITH A CHANCE
OF TSTMS.
THU NIGHT...SE WINDS 5 TO 10 KT
BECOMING NW AFTER MIDNIGHT. WAVES
1 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
AFTERNOON. SHOWERS LIKELY WITH A CHANCE OF TSTMS THROUGH THE NIGHT.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ541-182000-
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TUE
N WINDS 5 TO 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
TUE NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
WED
NW WINDS AROUND 5 KT. WAVES FLAT.
WED NIGHT
S WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
THU
SW WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
THU NIGHT...SE WINDS 5 KT
BECOMING NW AFTER MIDNIGHT. WAVES 1 FT.
SHOWERS LIKELY WITH A CHANCE OF TSTMS.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE DAY, THEN SHOWERS LIKELY WITH A CHANCE OF TSTMS THROUGH THE
NIGHT.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS LIKELY, MAINLY IN
THE MORNING.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ542-182000-
PATUXENT RIVER TO BROOMES ISLAND MD-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT
W WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY
1 TO 3 NM.
TUE
N WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY 1 TO
3 NM.
TUE NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT.
WED
NW WINDS AROUND 5 KT. WAVES 1 FT.
WED NIGHT
S WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
THU
S WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS WITH A CHANCE OF
TSTMS.
THU NIGHT
S WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
FRI
NE WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE DAY, THEN SHOWERS LIKELY WITH A CHANCE OF TSTMS THROUGH THE
NIGHT.
SAT
E WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING, THEN SHOWERS LIKELY THROUGH THE NIGHT. A CHANCE OF SHOWERS
AFTER MIDNIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ534-182000-
CHESAPEAKE BAY FROM DRUM POINT TO SMITH POINT-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT
W WINDS 5 KT. WAVES LESS THAN 1 FT. SCATTERED SHOWERS
WITH ISOLATED TSTMS.
TUE
NW WINDS 5 TO 10 KT. WAVES 1 FT.
TUE NIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT.
WED
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
WED NIGHT
S WINDS 5 TO 10 KT. WAVES 1 FT.
THU
S WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS WITH A CHANCE OF
TSTMS.
THU NIGHT
S WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
FRI...N WINDS 5 TO 10 KT
BECOMING E AFTER MIDNIGHT. WAVES 1 FT. A
CHANCE OF SHOWERS THROUGH THE DAY. A CHANCE OF TSTMS. SHOWERS LIKELY
THROUGH THE NIGHT.
SAT...NW WINDS 5 TO 10 KT
BECOMING S. WAVES 1 FT. SHOWERS LIKELY.
A CHANCE OF SHOWERS AFTER MIDNIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ543-182000-
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-
1236 AM EDT TUE AUG 18 2026
OVERNIGHT
W WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. SCATTERED
SHOWERS WITH ISOLATED TSTMS.
TUE
NW WINDS 5 TO 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
TUE NIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.
WED
NW WINDS 5 KT. WAVES FLAT.
WED NIGHT
S WINDS 5 TO 10 KT. WAVES 1 FT.
THU
SW WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY WITH A CHANCE
OF TSTMS.
THU NIGHT
S WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS WITH A CHANCE
OF TSTMS.
FRI...N WINDS 5 TO 10 KT
BECOMING E. WAVES 1 FT. A CHANCE OF
TSTMS. A CHANCE OF SHOWERS THROUGH THE DAY, THEN SHOWERS LIKELY
THROUGH THE NIGHT.
SAT...W WINDS 5 TO 10 KT
BECOMING S. WAVES 1 FT. SHOWERS LIKELY.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
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