365
FZUS51 KLWX 190439
CWFLWX
COASTAL WATERS FORECAST
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1238 AM EDT WED AUG 19 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.
ANZ500-192000-
1238 AM EDT WED AUG 19 2026
.SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY...
HIGH PRESSURE WILL GRADUALLY BUILD IN FROM THE OHIO RIVER VALLEY
TODAY, THEN MOVE OFFSHORE TONIGHT 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.
ANZ535-192000-
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
WED
NW WINDS AROUND 5 KT. WAVES 1 FT.
WED NIGHT
W WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
THU
SE WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
THU NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS WITH A CHANCE
OF TSTMS.
FRI
NE WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
SAT
SE WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY, MAINLY IN
THE MORNING.
SUN
W WINDS AROUND 5 KT. WAVES 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ536-192000-
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
WED
NW WINDS AROUND 5 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
WED NIGHT
SW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
THU
S WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND
TSTMS.
THU NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
FRI
NE WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
SAT
E WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY, MAINLY IN
THE MORNING.
SUN
W WINDS AROUND 5 KT. WAVES 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ537-192000-
TIDAL POTOMAC FROM COBB ISLAND TO SMITH POINT-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
NW WINDS 5 KT. WAVES FLAT.
WED
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
WED NIGHT
S WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
THU
S WINDS 5 KT. WAVES LESS THAN 1 FT. 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.
FRI NIGHT
SE WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS LIKELY
WITH A CHANCE OF TSTMS.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS LIKELY THROUGH
THE DAY, THEN A CHANCE OF SHOWERS THROUGH THE NIGHT.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ530-192000-
CHESAPEAKE BAY NORTH OF POOLES ISLAND-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
WED
W WINDS AROUND 5 KT. WAVES 1 FT. PATCHY FOG. VSBY 1 TO 3 NM.
WED NIGHT
W WINDS AROUND 5 KT. WAVES 1 FT.
THU
NE 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.
FRI NIGHT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS
AND TSTMS.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF TSTMS IN THE
MORNING. A CHANCE OF SHOWERS.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING, THEN A CHANCE OF SHOWERS AND TSTMS THROUGH THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ531-192000-
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
NW WINDS 5 KT. WAVES FLAT.
WED
W WINDS AROUND 5 KT. WAVES FLAT.
WED NIGHT
W WINDS AROUND 5 KT. WAVES FLAT.
THU
NE WINDS 5 KT. WAVES LESS THAN 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.
FRI NIGHT
SE WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS AND TSTMS.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF TSTMS IN THE
MORNING. A CHANCE OF SHOWERS.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE
MORNING, THEN A CHANCE OF SHOWERS AND TSTMS THROUGH THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ538-192000-
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
NW WINDS 5 KT. WAVES FLAT.
WED
W WINDS AROUND 5 KT. WAVES FLAT.
WED NIGHT
W WINDS AROUND 5 KT. WAVES FLAT.
THU
NE WINDS AROUND 5 KT. WAVES FLAT. SHOWERS WITH A CHANCE OF
TSTMS.
THU NIGHT
N WINDS 5 KT. WAVES FLAT. SHOWERS LIKELY WITH A CHANCE
OF TSTMS.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
SE WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS AND TSTMS.
SAT
SE WINDS 5 KT. WAVES FLAT. A CHANCE OF TSTMS IN THE MORNING.
A CHANCE OF SHOWERS.
SUN
W WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS AND
TSTMS THROUGH THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ539-192000-
CHESTER RIVER TO QUEENSTOWN MD-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
N WINDS 5 KT. WAVES FLAT.
WED
NW WINDS AROUND 5 KT. WAVES FLAT. PATCHY FOG. VSBY 1 TO 3 NM.
WED NIGHT
SW WINDS AROUND 5 KT. WAVES FLAT.
THU
E WINDS AROUND 5 KT. WAVES FLAT. SHOWERS 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. A CHANCE OF SHOWERS.
FRI NIGHT
SE WINDS AROUND 5 KT. WAVES FLAT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
SAT
E WINDS AROUND 5 KT. WAVES FLAT. SHOWERS LIKELY WITH A CHANCE
OF TSTMS IN THE MORNING, THEN A CHANCE OF SHOWERS.
SUN
W WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS AND
TSTMS THROUGH THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ532-192000-
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
NW WINDS 5 KT. WAVES FLAT.
WED
W WINDS 5 KT. WAVES LESS THAN 1 FT.
WED NIGHT
SW WINDS 5 KT. WAVES LESS THAN 1 FT.
THU...NE WINDS 5 KT
BECOMING SE IN THE AFTERNOON. WAVES 1 FT OR
LESS. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
THU NIGHT
N 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.
FRI NIGHT
SE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF TSTMS IN THE
MORNING. SHOWERS LIKELY. A CHANCE OF SHOWERS AFTER MIDNIGHT.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND TSTMS
THROUGH THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ540-192000-
EASTERN BAY-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
N WINDS 5 KT. WAVES FLAT.
WED
W WINDS AROUND 5 KT. WAVES FLAT.
WED NIGHT
SW WINDS AROUND 5 KT. WAVES FLAT.
THU
SE WINDS AROUND 5 KT. WAVES FLAT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
THU NIGHT
N 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. A CHANCE OF SHOWERS.
FRI NIGHT
SE WINDS 5 KT. WAVES FLAT. SHOWERS LIKELY WITH A CHANCE
OF TSTMS.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF TSTMS IN THE
MORNING. SHOWERS LIKELY. A CHANCE OF SHOWERS AFTER MIDNIGHT.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND TSTMS
THROUGH THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ533-192000-
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
WED
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
WED NIGHT
SW WINDS 5 KT. WAVES LESS THAN 1 FT.
THU
SE WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND
TSTMS.
THU NIGHT
N 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.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF TSTMS IN THE
MORNING. SHOWERS LIKELY. A CHANCE OF SHOWERS AFTER MIDNIGHT.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND TSTMS
THROUGH THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ541-192000-
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
NW WINDS 5 KT. WAVES FLAT.
WED
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
WED NIGHT
SW WINDS AROUND 5 KT. WAVES 1 FT.
THU
S WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS
AND 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.
FRI NIGHT
E WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS LIKELY WITH
A CHANCE OF TSTMS.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF TSTMS IN THE
MORNING. SHOWERS LIKELY. A CHANCE OF SHOWERS AFTER MIDNIGHT.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND TSTMS
THROUGH THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ542-192000-
PATUXENT RIVER TO BROOMES ISLAND MD-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
WED
NW WINDS AROUND 5 KT. WAVES 1 FT.
WED NIGHT
SW WINDS AROUND 5 KT. WAVES 1 FT.
THU
S WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND
TSTMS.
THU NIGHT
N WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS LIKELY WITH
A CHANCE OF TSTMS.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
E WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
SAT
E WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF TSTMS IN THE
MORNING. SHOWERS LIKELY. A CHANCE OF SHOWERS AFTER MIDNIGHT.
SUN
W WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ534-192000-
CHESAPEAKE BAY FROM DRUM POINT TO SMITH POINT-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
WED
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
WED NIGHT
S WINDS 5 TO 10 KT. WAVES 1 FT.
THU
S WINDS 5 TO 10 KT. 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.
FRI NIGHT
SE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS WITH A CHANCE
OF TSTMS.
SAT...E WINDS 5 TO 10 KT
BECOMING SW AFTER MIDNIGHT. WAVES 1 FT.
A CHANCE OF TSTMS IN THE MORNING. SHOWERS THROUGH THE DAY. A CHANCE
OF SHOWERS THROUGH THE NIGHT.
SUN
W WINDS 5 TO 10 KT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS AND
TSTMS THROUGH THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ543-192000-
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-
1238 AM EDT WED AUG 19 2026
OVERNIGHT
N WINDS 5 KT. WAVES FLAT. PATCHY FOG. VSBY 1 TO 3 NM.
WED
NW WINDS 5 KT. WAVES FLAT.
WED NIGHT
S WINDS 5 TO 10 KT. WAVES 1 FT.
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 N 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.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS WITH A CHANCE
OF TSTMS.
SAT...E WINDS 5 TO 10 KT
BECOMING SW AFTER MIDNIGHT. WAVES 1 FT.
A CHANCE OF TSTMS IN THE MORNING. SHOWERS THROUGH THE DAY. A CHANCE
OF SHOWERS THROUGH THE NIGHT.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND TSTMS
THROUGH THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
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