177
FZUS51 KLWX 202058
CWFLWX
COASTAL WATERS FORECAST
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
458 PM EDT THU AUG 20 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.
ANZ500-210800-
458 PM EDT THU AUG 20 2026
.SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY...
A COLD FRONT WILL SLOWLY APPROACH FROM PENNSYLVANIA TODAY AS A WARM
FRONT APPROACHES FROM THE VIRGINIA TIDEWATER AND DELMARVA PENINSULA.
MULTIPLE WEAK WAVES OF LOW PRESSURE ALONG THESE BOUNDARIES WILL
IGNITE SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS. SOME STORMS
MAY BE SEVERE PARTICULARLY EAST OF THE BLUE RIDGE AND CATOCTIN
MOUNTAINS, AND ESPECIALLY ACROSS THE INTERSTATE 95 CORRIDOR TOWARD
THE CHESAPEAKE BAY. THIS FRONTAL SYSTEM IS EXPECTED TO STALL NEAR OR
JUST SOUTHEAST OF THE MID-ATLANTIC, AND ADDITIONAL RIPPLES OF LOW
PRESSURE RIDING ALONG IT MAY RESULT IN PERIODIC SHOWERS AND A FEW
THUNDERSTORMS AT TIMES THROUGH THE UPCOMING WEEKEND.
ANZ535-210800-
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
W WINDS 10 KT WITH GUSTS TO 20 KT. WAVES
1 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
TONIGHT
N WINDS 5 TO 10 KT. GUSTS UP TO 20 KT EARLY IN THE
EVENING. WAVES 1 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
FRI
NE WINDS 5 KT. WAVES LESS THAN 1 FT.
FRI NIGHT
E WINDS AROUND 5 KT. WAVES 1 FT. NUMEROUS SHOWERS.
SAT
SE WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY.
SAT NIGHT
SW WINDS AROUND 5 KT. WAVES 1 FT OR LESS. A CHANCE OF
SHOWERS AND TSTMS.
SUN
NW WINDS AROUND 5 KT. WAVES 1 FT.
MON
NW WINDS 5 TO 10 KT. WAVES 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ536-210800-
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
SW WINDS 10 KT WITH GUSTS TO 20 KT. WAVES
1 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
TONIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND
TSTMS.
FRI
NE WINDS AROUND 5 KT. WAVES 1 FT.
FRI NIGHT
E WINDS AROUND 5 KT. WAVES 1 FT. NUMEROUS SHOWERS.
SAT
S WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS LIKELY.
SAT NIGHT
SW WINDS AROUND 5 KT. WAVES 1 FT OR LESS.
SUN
NW WINDS AROUND 5 KT. WAVES 1 FT.
MON
W WINDS AROUND 5 KT. WAVES 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ537-210800-
TIDAL POTOMAC FROM COBB ISLAND TO SMITH POINT-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
S WINDS 10 KT WITH GUSTS TO 20 KT. WAVES
2 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
TONIGHT...S WINDS 5 TO 10 KT WITH GUSTS TO 20 KT
BECOMING N IN
THE LATE EVENING AND OVERNIGHT. WAVES 1 TO 2 FT. 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. WIDESPREAD
SHOWERS.
SAT
S WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS WITH A CHANCE OF
TSTMS.
SAT NIGHT
SW WINDS 5 KT. WAVES FLAT.
SUN
NW WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS
THROUGH THE NIGHT.
MON...NW WINDS 5 TO 10 KT
BECOMING SW. WAVES 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ530-210800-
CHESAPEAKE BAY NORTH OF POOLES ISLAND-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
SW WINDS 10 KT WITH GUSTS TO 20 KT. WAVES
2 FT. SHOWERS WITH TSTMS LIKELY.
TONIGHT
N WINDS 5 TO 10 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
SHOWERS WITH TSTMS LIKELY.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
E WINDS 5 KT. WAVES LESS THAN 1 FT. NUMEROUS SHOWERS.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS WITH A CHANCE OF
TSTMS.
SAT NIGHT
SE WINDS AROUND 5 KT. WAVES 1 FT OR LESS. A CHANCE OF
SHOWERS AND TSTMS.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
MON
W WINDS 5 TO 10 KT. WAVES 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ531-210800-
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
SW WINDS 10 KT WITH GUSTS TO 20 KT. WAVES
1 FT. SHOWERS WITH TSTMS LIKELY.
TONIGHT
N WINDS 10 KT WITH GUSTS TO 20 KT. WAVES 1 FT. SHOWERS
WITH TSTMS LIKELY.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. NUMEROUS SHOWERS.
SAT
E WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS WITH A CHANCE OF
TSTMS.
SAT NIGHT
S WINDS AROUND 5 KT. WAVES 1 FT OR LESS. A CHANCE OF
SHOWERS AND TSTMS.
SUN
NW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
MON
NW WINDS 5 TO 10 KT. WAVES 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ538-210800-
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
SW WINDS 10 KT WITH GUSTS TO 20 KT. WAVES
1 FT. SHOWERS WITH TSTMS LIKELY.
TONIGHT
N WINDS 5 TO 10 KT. GUSTS UP TO 20 KT IN THE EVENING.
WAVES 1 FT. SHOWERS WITH TSTMS LIKELY.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
E WINDS 5 KT. WAVES LESS THAN 1 FT. NUMEROUS SHOWERS.
SAT
E WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS LIKELY WITH A
CHANCE OF TSTMS.
SAT NIGHT
S WINDS AROUND 5 KT. WAVES FLAT. A CHANCE OF SHOWERS
AND TSTMS.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT OR LESS. A CHANCE OF SHOWERS
THROUGH THE NIGHT.
MON
NW WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ539-210800-
CHESTER RIVER TO QUEENSTOWN MD-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
SW WINDS 10 KT WITH GUSTS TO 20 KT. WAVES
1 FT. SHOWERS AND TSTMS LIKELY.
TONIGHT
N WINDS 10 KT. WAVES 1 FT. SHOWERS AND TSTMS LIKELY.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
E WINDS 5 KT. WAVES FLAT. NUMEROUS SHOWERS.
SAT
SE WINDS 5 KT. WAVES FLAT. SHOWERS WITH A CHANCE OF TSTMS.
SAT NIGHT
S WINDS AROUND 5 KT. WAVES FLAT. A CHANCE OF SHOWERS
AND TSTMS.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
MON
NW WINDS 5 TO 10 KT. WAVES 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ532-210800-
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
S WINDS 10 KT WITH GUSTS TO 20 KT. WAVES
2 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
TONIGHT
N WINDS 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 TO 10 KT. WAVES 1 FT. NUMEROUS SHOWERS.
SAT
SE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS WITH A CHANCE OF
TSTMS.
SAT NIGHT
SW WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS AND TSTMS.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
MON
W WINDS 5 TO 10 KT. WAVES 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ540-210800-
EASTERN BAY-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
S WINDS 10 KT WITH GUSTS TO 20 KT. WAVES
1 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
TONIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS AND TSTMS LIKELY.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
E WINDS 5 KT. WAVES FLAT. NUMEROUS SHOWERS.
SAT
SE WINDS 5 KT. WAVES FLAT. SHOWERS WITH A CHANCE OF TSTMS.
SAT NIGHT
S WINDS AROUND 5 KT. WAVES FLAT. A CHANCE OF SHOWERS
AND TSTMS.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
MON
W WINDS 5 TO 10 KT. WAVES 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ533-210800-
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
S WINDS 10 KT WITH GUSTS TO 20 KT. WAVES
2 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
TONIGHT
N WINDS 5 TO 10 KT. GUSTS UP TO 20 KT IN THE EVENING.
WAVES 1 TO 2 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
FRI
NE WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. WIDESPREAD SHOWERS.
SAT
SE WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS WITH A CHANCE OF
TSTMS.
SAT NIGHT
SW WINDS 5 KT. WAVES LESS THAN 1 FT. A CHANCE OF
SHOWERS AND TSTMS.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
MON
W WINDS 5 TO 10 KT. WAVES 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ541-210800-
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
S WINDS 10 KT WITH GUSTS TO 20 KT. WAVES
1 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
TONIGHT
NE WINDS 5 TO 10 KT. GUSTS UP TO 20 KT IN THE EVENING.
WAVES 1 FT. SHOWERS AND TSTMS LIKELY.
FRI
N WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. WIDESPREAD SHOWERS.
SAT
SE WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS WITH A CHANCE OF
TSTMS.
SAT NIGHT
SW WINDS 5 KT. WAVES FLAT. A CHANCE OF SHOWERS AND
TSTMS.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
MON
W WINDS 5 TO 10 KT. WAVES 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ542-210800-
PATUXENT RIVER TO BROOMES ISLAND MD-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
S WINDS 10 KT. WAVES 1 FT. SHOWERS LIKELY
WITH A CHANCE OF TSTMS.
TONIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS AND TSTMS LIKELY.
FRI
N WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
E WINDS AROUND 5 KT. WAVES 1 FT. WIDESPREAD SHOWERS.
SAT
S WINDS AROUND 5 KT. WAVES 1 FT. SHOWERS WITH A CHANCE OF
TSTMS.
SAT NIGHT
SW WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS
AND TSTMS.
SUN
W WINDS AROUND 5 KT. WAVES 1 FT. A CHANCE OF SHOWERS THROUGH
THE NIGHT.
MON
W WINDS 5 KT. WAVES LESS THAN 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ534-210800-
CHESAPEAKE BAY FROM DRUM POINT TO SMITH POINT-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
S WINDS 15 KT WITH GUSTS TO 20 KT. WAVES
2 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
TONIGHT...S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING N IN
THE LATE EVENING AND OVERNIGHT. WAVES 1 TO 2 FT. SHOWERS WITH A
CHANCE OF TSTMS.
FRI
N WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
SE WINDS 5 TO 10 KT. WAVES 1 FT. WIDESPREAD SHOWERS.
SAT
S WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS WITH A CHANCE OF
TSTMS.
SAT NIGHT
SW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS
AND TSTMS.
SUN
W WINDS 5 TO 10 KT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS
THROUGH THE NIGHT.
MON...NW WINDS 5 TO 10 KT
BECOMING W. WAVES 1 TO 2 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ543-210800-
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-
458 PM EDT THU AUG 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING
..TORNADO WATCH 605 IN EFFECT UNTIL 10 PM EDT THIS EVENING
REST OF THIS AFTERNOON
S WINDS 15 KT WITH GUSTS TO 20 KT. WAVES
2 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.
TONIGHT...S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING NW
5 TO 10 KT AFTER MIDNIGHT. WAVES 1 TO 2 FT. SHOWERS WITH A CHANCE OF
TSTMS.
FRI
N WINDS 5 TO 10 KT. WAVES 1 FT.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. WIDESPREAD SHOWERS.
SAT
S WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS WITH A CHANCE OF
TSTMS.
SAT NIGHT
SW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS
AND TSTMS.
SUN
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND TSTMS
THROUGH THE NIGHT.
MON...NW WINDS 5 TO 10 KT
BECOMING W. WAVES 1 FT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
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