858  
FZUS51 KLWX 201457  
CWFLWX  
 
COASTAL WATERS FORECAST  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1057 AM EDT MON JUL 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.  
 
ANZ500-202000-  
1057 AM EDT MON JUL 20 2026  
 
.SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY...  
 
HIGH PRESSURE WILL PASS NORTH OF THE AREA TODAY. A WARM FRONT WILL  
RETURN NORTHWARD TONIGHT INTO TUESDAY, FOLLOWED BY ANOTHER COLD  
FRONT TUESDAY NIGHT INTO WEDNESDAY. HIGH PRESSURE WILL BUILD IN FROM  
THE WEST THURSDAY AND FRIDAY. SMALL CRAFT ADVISORIES WILL LIKELY BE  
NEEDED TUESDAY THROUGH EARLY THURSDAY.  
 

 
 
ANZ535-202000-  
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD-  
1057 AM EDT MON JUL 20 2026  
   
REST OF TODAY
 
SE WINDS 5 KT. WAVES LESS THAN 1 FT.    
TONIGHT
 
S WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND  
TSTMS.    
TUE
 
S WINDS 5 TO 10 KT. GUSTS UP TO 20 KT IN THE LATE MORNING AND  
AFTERNOON. WAVES 1 FT. SHOWERS WITH TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 5 TO 10 KT WITH GUSTS TO 20 KT. WAVES 1 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED
 
W WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY WITH A CHANCE  
OF TSTMS.    
WED NIGHT
 
N WINDS 5 TO 10 KT. WAVES 1 FT.    
THU
 
NE WINDS AROUND 5 KT. WAVES 1 FT OR LESS.    
FRI
 
E WINDS AROUND 5 KT. WAVES 1 FT OR LESS.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
ANZ536-202000-  
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND-  
1057 AM EDT MON JUL 20 2026  
   
REST OF TODAY
 
SE WINDS 5 TO 10 KT. WAVES 1 FT.    
TONIGHT
 
S WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND  
TSTMS.    
TUE
 
SW WINDS 10 TO 15 KT. GUSTS UP TO 20 KT IN THE LATE MORNING  
AND AFTERNOON. WAVES 1 FT. SHOWERS AND TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED
 
W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND  
TSTMS.    
WED NIGHT
 
NW WINDS 5 TO 10 KT. WAVES 1 FT.    
THU
 
NE WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.    
FRI
 
E WINDS AROUND 5 KT. WAVES 1 FT OR LESS.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
ANZ537-202000-  
TIDAL POTOMAC FROM COBB ISLAND TO SMITH POINT-  
1057 AM EDT MON JUL 20 2026  
 
...SMALL CRAFT ADVISORY IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH  
LATE TONIGHT...  
   
REST OF TODAY
 
E WINDS 5 TO 10 KT. WAVES 1 FT.    
TONIGHT...SE WINDS 10 TO 15 KT
 
BECOMING S LATE. GUSTS UP TO  
20 KT. WAVES 2 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.    
TUE
 
SW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.  
SHOWERS AND TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 2 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED
 
SW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT. SHOWERS  
WITH A CHANCE OF TSTMS.    
WED NIGHT
 
NW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.    
THU...NE WINDS 10 TO 15 KT
 
DIMINISHING TO 5 KT AFTER MIDNIGHT.  
WAVES 1 TO 2 FT.    
FRI
 
E WINDS 5 TO 10 KT. WAVES 1 FT.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
ANZ530-202000-  
CHESAPEAKE BAY NORTH OF POOLES ISLAND-  
1057 AM EDT MON JUL 20 2026  
   
REST OF TODAY
 
SE WINDS 5 KT. WAVES FLAT.    
TONIGHT
 
SE WINDS 10 TO 15 KT. WAVES 1 FT. A CHANCE OF SHOWERS.    
TUE
 
S WINDS 5 TO 10 KT WITH GUSTS TO 20 KT. WAVES 1 FT. SHOWERS  
WITH TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED
 
W WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT. A CHANCE  
OF SHOWERS AND TSTMS.    
WED NIGHT
 
NW WINDS 5 TO 10 KT. WAVES 1 FT.    
THU
 
N WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.    
FRI
 
E WINDS AROUND 5 KT. WAVES FLAT.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
ANZ531-202000-  
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT-  
1057 AM EDT MON JUL 20 2026  
 
...SMALL CRAFT ADVISORY IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH  
LATE TONIGHT...  
   
REST OF TODAY
 
SE WINDS 5 KT. WAVES LESS THAN 1 FT.    
TONIGHT
 
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.  
SHOWERS LIKELY.    
TUE
 
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT. SHOWERS  
WITH TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 2 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED
 
W WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT. A  
CHANCE OF SHOWERS AND TSTMS.    
WED NIGHT
 
N WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.    
THU...NE WINDS 10 TO 15 KT
 
DIMINISHING TO AROUND 5 KT AFTER  
MIDNIGHT. WAVES 1 TO 2 FT...SUBSIDING TO FLAT AFTER MIDNIGHT.    
FRI
 
E WINDS AROUND 5 KT. WAVES 1 FT OR LESS.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
ANZ538-202000-  
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-  
1057 AM EDT MON JUL 20 2026  
   
REST OF TODAY
 
E WINDS 5 KT. WAVES LESS THAN 1 FT.    
TONIGHT
 
SE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY.    
TUE
 
S WINDS 5 TO 10 KT WITH GUSTS TO 20 KT. WAVES 1 FT. SHOWERS  
WITH TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 10 KT WITH GUSTS TO 20 KT. WAVES 1 FT. SHOWERS  
WITH A CHANCE OF TSTMS.    
WED
 
W WINDS 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS AND TSTMS.    
WED NIGHT
 
N WINDS 5 TO 10 KT. WAVES 1 FT.    
THU
 
NE WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.    
FRI
 
E WINDS AROUND 5 KT. WAVES FLAT.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
ANZ539-202000-  
CHESTER RIVER TO QUEENSTOWN MD-  
1057 AM EDT MON JUL 20 2026  
   
REST OF TODAY
 
SE WINDS 5 KT. WAVES FLAT.    
TONIGHT
 
SE WINDS 10 TO 15 KT. WAVES 1 FT. SHOWERS LIKELY.    
TUE
 
S WINDS 5 TO 10 KT WITH GUSTS TO 20 KT. WAVES 1 FT. SHOWERS  
AND TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED
 
W WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT. A  
CHANCE OF SHOWERS.    
WED NIGHT
 
N WINDS 5 TO 10 KT. WAVES 1 FT.    
THU
 
NE WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.    
FRI
 
E WINDS AROUND 5 KT. WAVES FLAT.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
ANZ532-202000-  
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH-  
1057 AM EDT MON JUL 20 2026  
 
...SMALL CRAFT ADVISORY IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH  
LATE TONIGHT...  
   
REST OF TODAY
 
SE WINDS 5 KT. WAVES LESS THAN 1 FT.    
TONIGHT
 
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 3 FT.  
SHOWERS LIKELY WITH A CHANCE OF TSTMS.    
TUE
 
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT. SHOWERS  
AND TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 3 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED
 
W WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.  
SHOWERS LIKELY.    
WED NIGHT
 
NW WINDS 10 TO 15 KT. WAVES 1 TO 2 FT.    
THU...NE WINDS 10 TO 15 KT
 
DIMINISHING TO 5 KT AFTER MIDNIGHT.  
WAVES 1 TO 2 FT.    
FRI
 
E WINDS 5 KT. WAVES LESS THAN 1 FT.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
ANZ540-202000-  
EASTERN BAY-  
1057 AM EDT MON JUL 20 2026  
   
REST OF TODAY
 
SE WINDS 5 KT. WAVES FLAT.    
TONIGHT
 
S WINDS 10 TO 15 KT. WAVES 1 FT. SHOWERS LIKELY.    
TUE
 
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.  
SHOWERS AND TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED
 
W WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.  
SHOWERS LIKELY.    
WED NIGHT
 
N WINDS 5 TO 10 KT. WAVES 1 FT.    
THU
 
NE WINDS 5 TO 10 KT. WAVES 1 FT OR LESS.    
FRI
 
E WINDS AROUND 5 KT. WAVES 1 FT OR LESS.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
ANZ533-202000-  
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT-  
1057 AM EDT MON JUL 20 2026  
 
...SMALL CRAFT ADVISORY IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH  
LATE TONIGHT...  
   
REST OF TODAY...E WINDS 5 KT
 
BECOMING SE LATE. WAVES 1 FT.    
TONIGHT
 
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 TO 3 FT.  
SHOWERS LIKELY WITH A CHANCE OF TSTMS.    
TUE...S WINDS 10 TO 15 KT. GUSTS UP TO 20 KT
 
INCREASING TO 25 KT  
LATE. WAVES 2 FT. SHOWERS AND TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 3 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED
 
W WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT. SHOWERS  
WITH A CHANCE OF TSTMS.    
WED NIGHT
 
NW WINDS 10 TO 15 KT. GUSTS UP TO 20 KT. WAVES 1 TO  
2 FT.    
THU...NE WINDS 10 TO 15 KT
 
DIMINISHING TO 5 KT AFTER MIDNIGHT.  
WAVES 1 TO 2 FT.    
FRI
 
E WINDS AROUND 5 KT. WAVES 1 FT.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
ANZ541-202000-  
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-  
1057 AM EDT MON JUL 20 2026  
 
...SMALL CRAFT ADVISORY IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH  
LATE TONIGHT...  
   
REST OF TODAY
 
SE WINDS 5 KT. WAVES LESS THAN 1 FT.    
TONIGHT
 
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 2 FT.  
SHOWERS LIKELY WITH A CHANCE OF TSTMS.    
TUE
 
S WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.  
SHOWERS AND TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 2 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED
 
W WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 TO 2 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED NIGHT
 
NW WINDS 10 TO 15 KT. WAVES 1 FT.    
THU...NE WINDS 10 TO 15 KT
 
BECOMING E 5 KT AFTER MIDNIGHT. WAVES  
1 FT.    
FRI
 
E WINDS AROUND 5 KT. WAVES 1 FT.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
ANZ542-202000-  
PATUXENT RIVER TO BROOMES ISLAND MD-  
1057 AM EDT MON JUL 20 2026  
   
REST OF TODAY
 
SE WINDS 5 TO 10 KT. WAVES 1 FT.    
TONIGHT
 
SE WINDS 5 TO 10 KT. WAVES 1 FT. SHOWERS LIKELY WITH A  
CHANCE OF TSTMS.    
TUE
 
SW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT. SHOWERS  
AND TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED
 
SW WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT. SHOWERS  
WITH A CHANCE OF TSTMS.    
WED NIGHT
 
NW WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS.    
THU
 
NE WINDS 5 TO 10 KT. WAVES 1 FT.    
FRI
 
E WINDS AROUND 5 KT. WAVES 1 FT.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
ANZ534-202000-  
CHESAPEAKE BAY FROM DRUM POINT TO SMITH POINT-  
1057 AM EDT MON JUL 20 2026  
 
...SMALL CRAFT ADVISORY IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH  
LATE TONIGHT...  
   
REST OF TODAY
 
SE WINDS 5 TO 10 KT. WAVES 1 FT.    
TONIGHT...SE WINDS 10 TO 15 KT
 
BECOMING S LATE. GUSTS UP TO  
20 KT. WAVES 3 FT. SHOWERS LIKELY WITH A CHANCE OF TSTMS.    
TUE...SW WINDS 10 TO 15 KT. GUSTS UP TO 20 KT
 
INCREASING TO  
25 KT LATE. WAVES 2 TO 3 FT. SHOWERS AND TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 20 TO 25 KT WITH GUSTS TO 30 KT. WAVES 3 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED
 
SW WINDS 15 TO 20 KT WITH GUSTS TO 25 KT. WAVES 3 FT. SHOWERS  
WITH A CHANCE OF TSTMS.    
WED NIGHT
 
NW WINDS 10 TO 15 KT. GUSTS UP TO 20 KT. WAVES 2 FT.  
SHOWERS LIKELY.    
THU
 
NE WINDS 10 TO 15 KT. WAVES 1 TO 2 FT. A CHANCE OF SHOWERS IN  
THE MORNING.    
FRI
 
NE WINDS 5 TO 10 KT. WAVES 1 FT.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
ANZ543-202000-  
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-  
1057 AM EDT MON JUL 20 2026  
 
...SMALL CRAFT ADVISORY IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH  
LATE TONIGHT...  
   
REST OF TODAY
 
SE WINDS 5 TO 10 KT. WAVES 1 FT.    
TONIGHT
 
SE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT. A  
CHANCE OF SHOWERS AND TSTMS.    
TUE...SW WINDS 10 TO 15 KT. GUSTS UP TO 20 KT
 
INCREASING TO  
25 KT LATE. WAVES 2 FT. SHOWERS AND TSTMS LIKELY.    
TUE NIGHT
 
SW WINDS 20 TO 25 KT WITH GUSTS TO 30 KT. WAVES 3 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED
 
SW WINDS 20 TO 25 KT WITH GUSTS TO 30 KT. WAVES 2 TO 3 FT.  
SHOWERS WITH A CHANCE OF TSTMS.    
WED NIGHT...NW WINDS 10 TO 15 KT
 
BECOMING N AFTER MIDNIGHT. GUSTS  
UP TO 20 KT. WAVES 1 TO 2 FT. SHOWERS LIKELY.    
THU
 
NE WINDS 10 TO 15 KT. WAVES 1 FT. A CHANCE OF SHOWERS IN THE  
MORNING.    
FRI
 
NE WINDS 5 TO 10 KT. WAVES 1 FT.  
 
WINDS AND WAVES HIGHER AND VISIBILITIES LOWER IN AND NEAR TSTMS.  
 

 
 
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