630
FZUS51 KLWX 201707
CWFLWX
COASTAL WATERS FORECAST
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
107 PM EDT WED MAY 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-
107 PM EDT WED MAY 20 2026
.SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY...
SMALL CRAFT ADVISORIES MAY BE NEEDED THROUGH THURSDAY AS A COLD
FRONT SLOWLY CROSSES THE WATERS. THE FRONT WILL BRING SCATTERED TO
NUMEROUS SHOWERS AND THUNDERSTORMS THIS AFTERNOON AND EVENING.
SPECIAL MARINE WARNINGS MAY BE NEEDED FOR STRONGER THUNDERSTORMS
DURING THIS TIME. ADDITIONAL SMALL CRAFT ADVISORIES WILL BE NEEDED
THURSDAY AFTERNOON AND EVENING IN NORTHERLY CHANNELING. INCREASED
ONSHORE FLOW WILL KEEP SMALL CRAFT ADVISORY CONDITIONS GOING ACROSS
THE WATERS AT TIMES FRIDAY INTO THE WEEKEND.
ANZ535-210800-
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD-
107 PM EDT WED MAY 20 2026
...SEVERE THUNDERSTORM WATCH 234 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...
THIS AFTERNOON
SW WINDS 10 KT. WAVES 1 FT. NUMEROUS SHOWERS AND
TSTMS.
TONIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
THU
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS.
THU NIGHT
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY.
FRI
E WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS.
FRI NIGHT
E WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS.
SUN
E 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.
ANZ536-210800-
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND-
107 PM EDT WED MAY 20 2026
THIS AFTERNOON
S WINDS 5 TO 10 KT. WAVES 1 FT. ISOLATED SHOWERS
AND TSTMS.
TONIGHT...NW WINDS 5 TO 10 KT
BECOMING N AFTER MIDNIGHT. WAVES
1 FT. SCATTERED SHOWERS.
THU
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS.
THU NIGHT
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY.
FRI
NE WINDS 10 KT. WAVES 1 FT. SHOWERS.
FRI NIGHT
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS.
SUN
NE 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.
ANZ537-210800-
TIDAL POTOMAC FROM COBB ISLAND TO SMITH POINT-
107 PM EDT WED MAY 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 11 PM EDT THIS EVENING
...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY MORNING THROUGH LATE
THURSDAY NIGHT...
THIS AFTERNOON
S WINDS 10 KT WITH GUSTS TO 20 KT. WAVES 1 TO
2 FT. ISOLATED SHOWERS AND TSTMS.
TONIGHT...SE WINDS 10 KT WITH GUSTS TO 20 KT
BECOMING NE AFTER
MIDNIGHT. WAVES 1 TO 2 FT. SCATTERED SHOWERS.
THU...NE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT
INCREASING TO
25 KT LATE. WAVES 2 FT. A CHANCE OF SHOWERS.
THU NIGHT
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.
SHOWERS.
FRI
NE WINDS 10 TO 15 KT WITH GUSTS TO 25 KT. WAVES 2 TO 3 FT.
SHOWERS.
FRI NIGHT
NE WINDS 10 TO 15 KT WITH GUSTS TO 25 KT. WAVES 2 TO
3 FT. SHOWERS.
SAT...E WINDS 10 TO 15 KT
BECOMING NE 5 KT AFTER MIDNIGHT. WAVES
1 TO 2 FT. SHOWERS. A CHANCE OF TSTMS THROUGH THE NIGHT.
SUN
NE 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.
ANZ530-210800-
CHESAPEAKE BAY NORTH OF POOLES ISLAND-
107 PM EDT WED MAY 20 2026
...SEVERE THUNDERSTORM WATCH 234 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY MORNING THROUGH
THURSDAY AFTERNOON...
THIS AFTERNOON
SW WINDS 10 KT. WAVES 1 FT. WIDESPREAD SHOWERS AND
TSTMS.
TONIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT. WIDESPREAD SHOWERS AND
SCATTERED TSTMS.
THU
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
SHOWERS.
THU NIGHT
NE WINDS 5 TO 10 KT. WAVES 1 FT.
FRI
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT. SHOWERS
LIKELY.
FRI NIGHT
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
SHOWERS.
SAT
E WINDS 10 TO 15 KT. WAVES 1 FT. SHOWERS.
SUN
NE WINDS AROUND 5 KT. WAVES 1 FT OR LESS. SHOWERS IN THE
MORNING. A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ531-210800-
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT-
107 PM EDT WED MAY 20 2026
...SEVERE THUNDERSTORM WATCH 234 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY MORNING THROUGH
THURSDAY AFTERNOON...
THIS AFTERNOON
S WINDS 10 KT. WAVES 1 FT. WIDESPREAD SHOWERS AND
TSTMS.
TONIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY WITH
SCATTERED TSTMS.
THU
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.
SHOWERS.
THU NIGHT
NE WINDS 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
FRI
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT. SHOWERS
LIKELY.
FRI NIGHT
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.
SHOWERS.
SAT
E WINDS 10 TO 15 KT. WAVES 1 TO 2 FT. SHOWERS.
SUN
NE WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS IN THE MORNING.
A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ538-210800-
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-
107 PM EDT WED MAY 20 2026
...SEVERE THUNDERSTORM WATCH 234 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY MORNING THROUGH
THURSDAY AFTERNOON...
THIS AFTERNOON
SW WINDS 10 KT. WAVES 1 FT. WIDESPREAD SHOWERS AND
TSTMS.
TONIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY WITH
SCATTERED TSTMS.
THU
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
SHOWERS.
THU NIGHT
NE WINDS 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
FRI
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.
SHOWERS LIKELY.
FRI NIGHT
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
SHOWERS.
SAT...E WINDS 10 TO 15 KT
BECOMING NE 5 KT AFTER MIDNIGHT. WAVES
1 FT. SHOWERS.
SUN
NE WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS IN THE MORNING.
A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ539-210800-
CHESTER RIVER TO QUEENSTOWN MD-
107 PM EDT WED MAY 20 2026
...SEVERE THUNDERSTORM WATCH 234 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY MORNING THROUGH
THURSDAY AFTERNOON...
THIS AFTERNOON
S WINDS 10 KT. WAVES 1 FT. NUMEROUS SHOWERS AND
TSTMS.
TONIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT. NUMEROUS SHOWERS AND
SCATTERED TSTMS.
THU
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
SHOWERS.
THU NIGHT
NE WINDS 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
FRI
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT. SHOWERS
LIKELY.
FRI NIGHT
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
SHOWERS.
SAT...E WINDS 10 TO 15 KT
BECOMING NE 5 KT AFTER MIDNIGHT. WAVES
1 FT. SHOWERS.
SUN
NE WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS IN THE MORNING.
A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ532-210800-
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH-
107 PM EDT WED MAY 20 2026
...SEVERE THUNDERSTORM WATCH 234 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...
...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY MORNING THROUGH
THURSDAY AFTERNOON...
THIS AFTERNOON
S WINDS 10 KT. WAVES 1 TO 2 FT. ISOLATED SHOWERS
AND TSTMS.
TONIGHT
NE WINDS 5 TO 10 KT. WAVES 1 TO 2 FT. A CHANCE OF
SHOWERS.
THU
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.
SHOWERS.
THU NIGHT
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO
2 FT. A CHANCE OF SHOWERS.
FRI
E WINDS 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT. SHOWERS
LIKELY.
FRI NIGHT
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.
SHOWERS.
SAT...E WINDS 10 TO 15 KT
BECOMING NE 5 KT AFTER MIDNIGHT. WAVES
1 TO 2 FT. SHOWERS.
SUN
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS IN THE MORNING. A
CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ540-210800-
EASTERN BAY-
107 PM EDT WED MAY 20 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY MORNING THROUGH
THURSDAY AFTERNOON...
THIS AFTERNOON
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES
1 FT. SCATTERED SHOWERS AND TSTMS.
TONIGHT
N WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND
SCATTERED TSTMS.
THU
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
SHOWERS.
THU NIGHT
NE WINDS 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.
FRI
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT. SHOWERS
LIKELY.
FRI NIGHT
E WINDS 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT. SHOWERS.
SAT...E WINDS 10 TO 15 KT
BECOMING NE 5 KT AFTER MIDNIGHT. WAVES
1 FT. SHOWERS.
SUN
NE WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS IN THE MORNING.
A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ533-210800-
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT-
107 PM EDT WED MAY 20 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY MORNING THROUGH
THURSDAY AFTERNOON...
THIS AFTERNOON
S WINDS 10 KT WITH GUSTS TO 20 KT. WAVES 1 TO
2 FT. ISOLATED SHOWERS AND TSTMS.
TONIGHT...E WINDS 5 TO 10 KT
BECOMING NE AFTER MIDNIGHT. WAVES
1 TO 2 FT. SCATTERED SHOWERS.
THU
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 3 FT. SHOWERS
LIKELY.
THU NIGHT
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.
SHOWERS LIKELY.
FRI
E WINDS 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT. SHOWERS.
FRI NIGHT
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.
SHOWERS.
SAT...E WINDS 10 TO 15 KT
BECOMING NE 5 KT AFTER MIDNIGHT. WAVES
1 TO 2 FT. SHOWERS.
SUN
NE 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.
ANZ541-210800-
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-
107 PM EDT WED MAY 20 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY MORNING THROUGH
THURSDAY AFTERNOON...
THIS AFTERNOON
S WINDS 10 KT. WAVES 1 FT. ISOLATED SHOWERS AND
TSTMS.
TONIGHT...E WINDS 5 TO 10 KT
BECOMING NE AFTER MIDNIGHT. WAVES
1 FT. SCATTERED SHOWERS.
THU
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT. SHOWERS
LIKELY.
THU NIGHT
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
SHOWERS LIKELY.
FRI
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT. SHOWERS
LIKELY.
FRI NIGHT
E WINDS 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.
SHOWERS.
SAT...E WINDS 10 TO 15 KT
BECOMING NE 5 KT AFTER MIDNIGHT. WAVES
1 FT. SHOWERS.
SUN
NE WINDS 5 KT. WAVES LESS THAN 1 FT. SHOWERS IN THE MORNING.
A CHANCE OF SHOWERS.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ542-210800-
PATUXENT RIVER TO BROOMES ISLAND MD-
107 PM EDT WED MAY 20 2026
...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY MORNING THROUGH
THURSDAY AFTERNOON...
THIS AFTERNOON
S WINDS 10 KT. WAVES 1 FT. ISOLATED SHOWERS AND
TSTMS.
TONIGHT...E WINDS 10 KT
BECOMING N AFTER MIDNIGHT. WAVES 1 FT.
SCATTERED SHOWERS.
THU
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT. SHOWERS
LIKELY.
THU NIGHT
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
SHOWERS.
FRI
NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
SHOWERS.
FRI NIGHT
E WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.
SHOWERS.
SAT
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS.
SUN
NE 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.
ANZ534-210800-
CHESAPEAKE BAY FROM DRUM POINT TO SMITH POINT-
107 PM EDT WED MAY 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 11 PM EDT THIS EVENING
...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY MORNING THROUGH LATE
THURSDAY NIGHT...
THIS AFTERNOON
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES
2 TO 3 FT. ISOLATED SHOWERS AND TSTMS.
TONIGHT...SE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING NE
5 TO 10 KT AFTER MIDNIGHT. WAVES 3 FT... SUBSIDING TO 1 FT AFTER
MIDNIGHT. SCATTERED SHOWERS.
THU...NE WINDS 10 TO 15 KT. GUSTS UP TO 20 KT
INCREASING TO
25 KT LATE. WAVES 2 FT. A CHANCE OF SHOWERS.
THU NIGHT
NE WINDS 15 KT WITH GUSTS TO 25 KT. WAVES 2 FT. SHOWERS
LIKELY.
FRI
NE WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 3 FT.
SHOWERS.
FRI NIGHT
E WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 2 TO
3 FT. SHOWERS.
SAT
E WINDS 10 TO 15 KT. WAVES 1 TO 2 FT. SHOWERS THROUGH THE
DAY, THEN SHOWERS WITH A CHANCE OF TSTMS THROUGH THE NIGHT.
SUN
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY THROUGH THE
DAY, THEN A CHANCE OF SHOWERS THROUGH THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
ANZ543-210800-
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-
107 PM EDT WED MAY 20 2026
..SMALL CRAFT ADVISORY IN EFFECT UNTIL 11 PM EDT THIS EVENING
...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY MORNING THROUGH LATE
THURSDAY NIGHT...
THIS AFTERNOON
S WINDS 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO
2 FT. ISOLATED SHOWERS AND TSTMS.
TONIGHT...S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT
BECOMING NW
5 TO 10 KT LATE. WAVES 1 TO 2 FT. SCATTERED SHOWERS.
THU
NE WINDS 10 TO 15 KT WITH GUSTS TO 25 KT. WAVES 1 FT. A
CHANCE OF SHOWERS.
THU NIGHT
NE WINDS 10 TO 15 KT WITH GUSTS TO 25 KT. WAVES 1 FT.
SHOWERS LIKELY.
FRI
NE WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 2 FT. SHOWERS
LIKELY.
FRI NIGHT
E WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 1 TO
2 FT. SHOWERS.
SAT
E WINDS 10 TO 15 KT. WAVES 1 FT. SHOWERS THROUGH THE DAY,
THEN SHOWERS WITH A CHANCE OF TSTMS THROUGH THE NIGHT.
SUN
NE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS THROUGH THE DAY,
THEN A CHANCE OF SHOWERS THROUGH THE NIGHT.
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.
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