918
FZUS51 KLWX 180709
CWFLWX
COASTAL WATERS FORECAST
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
309 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.
ANZ500-182200-
309 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.
ANZ535-182200-
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TODAY
N WINDS 5 KT. WAVES LESS THAN 1 FT.
TONIGHT
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.
SAT
SE 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.
ANZ536-182200-
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TODAY
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TONIGHT
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
AND TSTMS IN THE AFTERNOON. SHOWERS LIKELY THROUGH THE NIGHT.
SAT
SE 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.
ANZ537-182200-
TIDAL POTOMAC FROM COBB ISLAND TO SMITH POINT-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
NW WINDS 5 KT. WAVES FLAT.
TODAY
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TONIGHT
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
SE WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS LIKELY. A CHANCE
OF SHOWERS AFTER MIDNIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ530-182200-
CHESAPEAKE BAY NORTH OF POOLES ISLAND-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
N WINDS 10 KT. WAVES 1 FT. PATCHY FOG. VSBY
1 TO 3 NM.
TODAY
N WINDS 5 TO 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
TONIGHT
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.
SAT
E 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.
ANZ531-182200-
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
NW WINDS 10 KT. WAVES 1 FT.
TODAY
N WINDS 5 TO 10 KT. WAVES 1 FT.
TONIGHT
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.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS IN
THE MORNING, THEN SHOWERS LIKELY.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ538-182200-
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
NW WINDS 5 KT. WAVES FLAT.
TODAY
N WINDS 5 KT. WAVES FLAT.
TONIGHT
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.
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.
ANZ539-182200-
CHESTER RIVER TO QUEENSTOWN MD-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
NW WINDS 5 KT. WAVES FLAT.
TODAY
N WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY 1 TO
3 NM.
TONIGHT
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 THROUGH THE NIGHT.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS IN
THE MORNING, THEN SHOWERS LIKELY.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ532-182200-
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TODAY
N WINDS 5 TO 10 KT. WAVES 1 FT.
TONIGHT
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 THROUGH THE NIGHT.
SAT...E WINDS 5 TO 10 KT
BECOMING SW AFTER MIDNIGHT. 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.
ANZ540-182200-
EASTERN BAY-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
NW WINDS 5 KT. WAVES FLAT.
TODAY
N WINDS 5 TO 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
TONIGHT
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 THROUGH THE NIGHT.
SAT
SE WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS LIKELY.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ533-182200-
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TODAY
N WINDS 5 TO 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
TONIGHT
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
BECOMING E AFTER MIDNIGHT. WAVES 1 FT.
SAT...SE WINDS 5 TO 10 KT
BECOMING SW AFTER MIDNIGHT. WAVES 1 FT.
SHOWERS LIKELY. A CHANCE OF SHOWERS AFTER MIDNIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ541-182200-
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TODAY
N WINDS 5 TO 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
TONIGHT
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
BECOMING E AFTER MIDNIGHT. WAVES 1 FT.
A CHANCE OF SHOWERS THROUGH THE DAY, THEN SHOWERS LIKELY THROUGH THE
NIGHT.
SAT
SE WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS LIKELY.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ542-182200-
PATUXENT RIVER TO BROOMES ISLAND MD-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY
FOG. VSBY 1 TO 3 NM.
TODAY
N WINDS 5 KT. WAVES LESS THAN 1 FT. PATCHY FOG. VSBY 1 TO
3 NM.
TONIGHT
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 THROUGH THE NIGHT.
SAT
SE WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY. A CHANCE OF
SHOWERS AFTER MIDNIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ534-182200-
CHESAPEAKE BAY FROM DRUM POINT TO SMITH POINT-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TODAY
NW WINDS 5 TO 10 KT. WAVES 1 FT.
TONIGHT
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 SE AFTER MIDNIGHT. WAVES 1 FT.
A CHANCE OF SHOWERS THROUGH THE DAY. A CHANCE OF TSTMS. SHOWERS
LIKELY THROUGH THE NIGHT.
SAT
S WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ543-182200-
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-
309 AM EDT TUE AUG 18 2026
REST OF THE OVERNIGHT
NW WINDS 10 KT. WAVES 1 FT.
TODAY
NW WINDS 5 TO 10 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO
3 NM.
TONIGHT
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 THROUGH THE
NIGHT.
SAT
S WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS, MAINLY IN THE
MORNING.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page