543
FZUS51 KLWX 130857
CWFLWX
COASTAL WATERS FORECAST
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
457 AM EDT THU AUG 13 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.
ANZ500-132300-
457 AM EDT THU AUG 13 2026
.SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY...
A STATIONARY FRONTAL BOUNDARY WILL REMAIN OFF TO THE SOUTH NEAR THE
VIRGINIA-NORTH CAROLINA BORDER THROUGH TONIGHT. THIS SYSTEM RETURNS
NORTHWARD AS A WARM FRONT FRIDAY WHICH INCREASES THUNDERSTORM
CHANCES. HIGH PRESSURE BUILDS ACROSS THE NORTHEASTERN U.S ON
SATURDAY BEFORE ANOTHER FRONTAL SYSTEM APPROACHES FROM THE WEST ON
SUNDAY INTO MONDAY. SMALL CRAFT ADVISORIES MAY BE NEEDED LATE SUNDAY
DUE TO SOUTHERLY CHANNELING.
ANZ535-132300-
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
W WINDS 5 KT. WAVES LESS THAN 1 FT.
TODAY
NW WINDS AROUND 5 KT. WAVES 1 FT.
TONIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT.
FRI
N WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
NE WINDS AROUND 5 KT. WAVES 1 FT.
SAT NIGHT
SE WINDS AROUND 5 KT. WAVES 1 FT.
SUN
SW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF TSTMS THROUGH
THE NIGHT. A CHANCE OF SHOWERS.
MON
NW 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.
ANZ536-132300-
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
W WINDS 5 KT. WAVES LESS THAN 1 FT.
TODAY
NW WINDS AROUND 5 KT. WAVES 1 FT.
TONIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT.
FRI
N WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
N WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
NE WINDS AROUND 5 KT. WAVES 1 FT.
SAT NIGHT
SE WINDS 5 KT. WAVES LESS THAN 1 FT.
SUN
SW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND
TSTMS THROUGH THE NIGHT. A CHANCE OF SHOWERS AFTER MIDNIGHT.
MON
NW 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.
ANZ537-132300-
TIDAL POTOMAC FROM COBB ISLAND TO SMITH POINT-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
SW WINDS 10 KT. WAVES 1 FT.
TODAY
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TONIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI
N WINDS AROUND 5 KT. WAVES 1 FT.
FRI NIGHT
NE WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
SE WINDS 5 TO 10 KT. WAVES 1 FT.
SUN
S WINDS 10 TO 15 KT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS AND
TSTMS IN THE AFTERNOON. A CHANCE OF SHOWERS THROUGH THE NIGHT.
MON
NW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ530-132300-
CHESAPEAKE BAY NORTH OF POOLES ISLAND-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
W WINDS 10 KT. WAVES 1 FT. A CHANCE OF
SHOWERS.
TODAY
NW WINDS 5 TO 10 KT. WAVES 1 FT.
TONIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI
NE WINDS AROUND 5 KT. WAVES FLAT.
FRI NIGHT
N WINDS AROUND 5 KT. WAVES FLAT. A CHANCE OF SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
SE WINDS 5 TO 10 KT. WAVES FLAT.
SUN...S WINDS 10 TO 15 KT
BECOMING SW AFTER MIDNIGHT. WAVES 1 FT.
A CHANCE OF SHOWERS IN THE AFTERNOON. A CHANCE OF TSTMS. SHOWERS
LIKELY THROUGH THE NIGHT.
MON
NW 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.
ANZ531-132300-
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
W WINDS 10 KT. WAVES 1 FT. A CHANCE OF
SHOWERS.
TODAY
NW WINDS 5 TO 10 KT. WAVES 1 FT.
TONIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI
NE WINDS 5 KT. WAVES LESS THAN 1 FT.
FRI NIGHT
NE WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF
SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
SE WINDS 5 TO 10 KT. WAVES 1 FT.
SUN...S WINDS 10 TO 15 KT
BECOMING SW AFTER MIDNIGHT. WAVES 1 TO
2 FT. A CHANCE OF SHOWERS AND TSTMS.
MON
NW 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.
ANZ538-132300-
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
W WINDS 5 KT. WAVES LESS THAN 1 FT. A
CHANCE OF SHOWERS.
TODAY
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
TONIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI
NE WINDS AROUND 5 KT. WAVES FLAT.
FRI NIGHT
NE WINDS AROUND 5 KT. WAVES FLAT. A CHANCE OF SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
SE WINDS 5 KT. WAVES LESS THAN 1 FT.
SUN...S WINDS 10 TO 15 KT
BECOMING SW 5 TO 10 KT AFTER MIDNIGHT.
WAVES 1 FT. A CHANCE OF SHOWERS AND TSTMS.
MON
NW 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.
ANZ539-132300-
CHESTER RIVER TO QUEENSTOWN MD-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
W WINDS 10 KT. WAVES 1 FT. A CHANCE OF
SHOWERS.
TODAY
NW WINDS 5 TO 10 KT. WAVES 1 FT.
TONIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI
NE WINDS AROUND 5 KT. WAVES 1 FT OR LESS. A CHANCE OF
SHOWERS.
FRI NIGHT
NE WINDS AROUND 5 KT. WAVES 1 FT OR LESS. A CHANCE OF
SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
SE WINDS 5 KT. WAVES LESS THAN 1 FT.
SUN...S WINDS 10 TO 15 KT
BECOMING SW AFTER MIDNIGHT. WAVES 1 TO
2 FT. A CHANCE OF SHOWERS AND TSTMS.
MON
NW 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.
ANZ532-132300-
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
W WINDS 10 KT. WAVES 1 FT.
TODAY
NW WINDS 5 TO 10 KT. WAVES 1 FT.
TONIGHT
NW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
FRI
NE WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
NE WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
SE WINDS 5 TO 10 KT. WAVES 1 FT.
SUN...S WINDS 5 TO 10 KT...BECOMING SW 15 TO 20 KT. WAVES 1 FT
BUILDING TO 2 TO 3 FT. A CHANCE OF SHOWERS AND TSTMS.
MON
NW 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.
ANZ540-132300-
EASTERN BAY-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
W WINDS 10 KT. WAVES 1 FT.
TODAY
NW WINDS 5 TO 10 KT. WAVES 1 FT.
TONIGHT
NW WINDS AROUND 5 KT. WAVES FLAT.
FRI
NE WINDS 5 KT. WAVES FLAT. A CHANCE OF SHOWERS.
FRI NIGHT
N WINDS AROUND 5 KT. WAVES FLAT. A CHANCE OF SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
SE WINDS 5 TO 10 KT. WAVES 1 FT.
SUN...S WINDS 10 TO 15 KT
BECOMING SW AFTER MIDNIGHT. WAVES 1 TO
2 FT. A CHANCE OF SHOWERS AND TSTMS.
MON
NW 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.
ANZ533-132300-
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
W WINDS 10 KT. WAVES 1 FT.
TODAY
NW WINDS 5 TO 10 KT. WAVES 1 FT.
TONIGHT
NW WINDS 5 KT. WAVES LESS THAN 1 FT.
FRI
N WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
NE WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
SE WINDS 5 TO 10 KT. WAVES 1 FT.
SUN...S WINDS 5 TO 10 KT...BECOMING SW 15 TO 20 KT. WAVES 1 FT
BUILDING TO 2 TO 3 FT. A CHANCE OF SHOWERS AND TSTMS THROUGH THE
NIGHT. A CHANCE OF SHOWERS AFTER MIDNIGHT.
MON
NW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ541-132300-
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
W WINDS 10 KT. WAVES 1 FT.
TODAY
NW WINDS 5 TO 10 KT. WAVES 1 FT.
TONIGHT
NW WINDS AROUND 5 KT. WAVES FLAT.
FRI
N WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
NE WINDS AROUND 5 KT. WAVES 1 FT OR LESS. A CHANCE OF
SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
SE WINDS 5 TO 10 KT. WAVES 1 FT.
SUN...S WINDS 10 TO 15 KT
BECOMING SW AFTER MIDNIGHT. WAVES 1 TO
2 FT. A CHANCE OF SHOWERS AND TSTMS THROUGH THE NIGHT. A CHANCE OF
SHOWERS AFTER MIDNIGHT.
MON
NW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ542-132300-
PATUXENT RIVER TO BROOMES ISLAND MD-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
SW 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.
FRI
N WINDS AROUND 5 KT. WAVES 1 FT.
FRI NIGHT
NE WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
SAT NIGHT
SE WINDS 5 KT. WAVES LESS THAN 1 FT.
SUN
S WINDS 10 TO 15 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND
TSTMS THROUGH THE NIGHT. A CHANCE OF SHOWERS AFTER MIDNIGHT.
MON
NW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ534-132300-
CHESAPEAKE BAY FROM DRUM POINT TO SMITH POINT-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
SW WINDS 10 KT. WAVES 1 FT.
TODAY
W WINDS 5 TO 10 KT. WAVES 1 FT.
TONIGHT
SW WINDS 5 KT. WAVES FLAT.
FRI
N WINDS 5 KT. WAVES LESS THAN 1 FT.
FRI NIGHT
NE WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
SE WINDS 5 TO 10 KT. WAVES 2 FT.
SUN...S WINDS 15 TO 20 KT
BECOMING SW AFTER MIDNIGHT. WAVES
1 FT...BUILDING TO 3 FT. A CHANCE OF SHOWERS.
MON...W WINDS 10 TO 15 KT
BECOMING NW 5 TO 10 KT. WAVES 1 TO
2 FT. A CHANCE OF SHOWERS.
ANZ543-132300-
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-
457 AM EDT THU AUG 13 2026
REST OF THE OVERNIGHT
SW WINDS 10 KT. WAVES 1 FT.
TODAY
W WINDS 5 TO 10 KT. WAVES 1 FT.
TONIGHT
W WINDS AROUND 5 KT. WAVES FLAT.
FRI
N WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF SHOWERS.
FRI NIGHT
NE WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
SAT NIGHT
SE WINDS 5 TO 10 KT. WAVES 1 FT.
SUN
S WINDS 15 TO 20 KT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS.
MON...W WINDS 10 TO 15 KT
BECOMING NW 5 TO 10 KT. WAVES 1 TO
2 FT. A CHANCE OF SHOWERS.
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