[Alert]BOX continues High Surf Advisory for Eastern Essex, Eastern Plymouth [MA] till Aug 23, 8:00 PM EDT

[ThreatWebInternal]

BOX continues High Surf Advisory for Eastern Essex, Eastern Plymouth [MA] till Aug 23, 8:00 PM EDT

328 
WHUS41 KBOX 211703
CFWBOX

Coastal Hazard Message
National Weather Service Boston/Norton MA
103 PM EDT Thu Aug 21 2025

MAZ020-RIZ006-007-221000-
/O.NEW.KBOX.CF.Y.0006.250822T1000Z-250822T1400Z/
/O.EXB.KBOX.CF.Y.0004.250822T2200Z-250823T0200Z/
/O.CON.KBOX.SU.Y.0001.000000T0000Z-250824T0000Z/
Southern Bristol MA-Washington RI-Newport RI-
103 PM EDT Thu Aug 21 2025

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT SATURDAY...
...COASTAL FLOOD ADVISORY IN EFFECT FROM 6 AM TO 10 AM EDT
FRIDAY...
...COASTAL FLOOD ADVISORY IN EFFECT FROM 6 PM TO 10 PM EDT
FRIDAY...

* WHAT...Large breaking waves of 10 to 15 feet. Flooding of up to
  one foot deep on vulnerable coastal roads and some debris on
  roadways around high tide Friday morning and Friday evening.

* WHERE...Massachusetts and Rhode Island South Coast.

* WHEN...For the High Surf Advisory, until 8 PM EDT Saturday. For
  the Coastal Flood Advisory, for high tides Friday morning and
  Friday evening.

* IMPACTS...Flooding up to one foot deep occurs along the most
  vulnerable shoreline locales in Newport, Portsmouth and
  Middletown. This includes flooding at parking lots near beaches
  in Newport, and a portion of Hazard Road. Shallow flooding also
  occurs on several streets in the Common Fence Point area.
  Dangerous swimming and surfing conditions and significant beach
  erosion.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive around barricades or through water of unknown depth
during high tide. Take the necessary actions to protect flood- 
prone property.

Many ocean beaches are closed. Stay out out of the water due to 
dangerous surf conditions. Only view surf at a safe distance, not
from jetties or piers.

&&

&&

Time of high total tides are approximate to the nearest hour.

Westerly RI at Watch Hill
MLLW Categories - Minor 5.0 ft, Moderate 8.0 ft, Major 9.5 ft
MHHW Categories - Minor 2.0 ft, Moderate 5.0 ft, Major 6.5 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/08 AM   3.4/ 3.9   0.4/ 0.9   0.8/ 1.3    5-6      None    
 21/09 PM   4.4/ 4.9   1.4/ 1.9   1.3/ 1.8     7       None    
 22/09 AM   4.2/ 4.7   1.3/ 1.8   1.6/ 2.0    7-8      None    
 22/09 PM   4.5/ 5.0   1.5/ 2.0   1.4/ 1.9     5       None    
 23/09 AM   3.5/ 4.0   0.5/ 1.0   0.8/ 1.3    3-4      None    
 23/10 PM   3.5/ 4.0   0.5/ 1.0   0.5/ 1.0     3       None

Newport Harbor
MLLW Categories - Minor 6.0 ft, Moderate 7.5 ft, Major 9.0 ft
MHHW Categories - Minor 2.1 ft, Moderate 3.6 ft, Major 5.1 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/07 AM   4.6/ 5.1   0.7/ 1.1   0.8/ 1.3     3       None    
 21/07 PM   5.2/ 5.7   1.4/ 1.9   1.1/ 1.6     3       None    
 22/08 AM   5.5/ 6.0   1.6/ 2.0   1.5/ 2.0     3       None    
 22/08 PM   5.7/ 6.2   1.9/ 2.3   1.5/ 2.0    3-4     Minor    
 23/08 AM   4.9/ 5.4   1.0/ 1.5   0.9/ 1.4     2       None    
 23/09 PM   4.7/ 5.2   0.9/ 1.4   0.6/ 1.1     2       None

Newport South Coast Beaches
MLLW Categories - Minor 6.0 ft, Moderate 7.5 ft, Major 9.0 ft
MHHW Categories - Minor 2.5 ft, Moderate 4.0 ft, Major 5.5 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/07 AM   4.2/ 4.7   0.7/ 1.1   0.7/ 1.1    5-6      None    
 21/07 PM   5.0/ 5.5   1.5/ 2.0   1.1/ 1.6    7-8      None    
 22/08 AM   5.2/ 5.7   1.7/ 2.2   1.5/ 2.0   8-10      None    
 22/08 PM   5.2/ 5.7   1.8/ 2.2   1.4/ 1.9    4-5      None    
 23/08 AM   4.6/ 5.1   1.1/ 1.6   0.8/ 1.3     3       None    
 23/09 PM   4.4/ 4.9   0.9/ 1.4   0.5/ 1.0     3       None

Mount Hope Bay near Bristol Point RI
MLLW Categories - Minor 7.0 ft, Moderate 9.5 ft, Major 12.0 ft
MHHW Categories - Minor 2.5 ft, Moderate 5.0 ft, Major 7.5 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/07 AM   4.9/ 5.4   0.4/ 0.9   0.8/ 1.3     2       None    
 21/08 PM   6.0/ 6.5   1.5/ 2.0   1.1/ 1.6     3       None    
 22/08 AM   5.7/ 6.2   1.2/ 1.7   1.4/ 1.9     3       None    
 22/08 PM   6.5/ 7.0   2.0/ 2.5   1.5/ 2.0    1-2      None    
 23/09 AM   5.2/ 5.7   0.7/ 1.1   0.9/ 1.4     1       None    
 23/09 PM   5.6/ 6.1   1.1/ 1.6   0.7/ 1.1    1-2      None

Mount Hope Bay near Fall River MA
MLLW Categories - Minor 7.0 ft, Moderate 9.5 ft, Major 12.0 ft
MHHW Categories - Minor 2.3 ft, Moderate 4.8 ft, Major 7.3 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/07 AM   5.5/ 6.0   0.8/ 1.3   0.8/ 1.3     2       None    
 21/08 PM   6.2/ 6.8   1.6/ 2.0   1.1/ 1.6     3       None    
 22/08 AM   6.2/ 6.7   1.5/ 2.0   1.3/ 1.8     3       None    
 22/08 PM   6.8/ 7.3   2.1/ 2.6   1.6/ 2.0    1-2     Minor    
 23/09 AM   6.0/ 6.5   1.3/ 1.8   0.9/ 1.4     1       None    
 23/09 PM   5.9/ 6.4   1.2/ 1.7   0.7/ 1.1    1-2      None

New Bedford Hurricane Barrier
MLLW Categories - Minor 6.0 ft, Moderate 7.5 ft, Major 9.5 ft
MHHW Categories - Minor 2.1 ft, Moderate 3.6 ft, Major 5.6 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/07 AM   4.2/ 4.7   0.4/ 0.9   0.6/ 1.1    2-3      None    
 21/07 PM   5.1/ 5.6   1.2/ 1.7   0.9/ 1.4     4       None    
 22/08 AM   5.2/ 5.7   1.4/ 1.9   1.3/ 1.8     4       None    
 22/08 PM   5.7/ 6.2   1.8/ 2.2   1.4/ 1.9     2       None    
 23/08 AM   4.7/ 5.2   0.9/ 1.4   0.8/ 1.3     1       None    
 23/09 PM   4.7/ 5.2   0.9/ 1.4   0.6/ 1.1    1-2      None

Westport
MLLW Categories - Minor 6.0 ft, Moderate 8.0 ft, Major 10.0 ft
MHHW Categories - Minor 2.5 ft, Moderate 4.5 ft, Major 6.5 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/07 AM   4.0/ 4.5   0.5/ 1.0   0.6/ 1.1    4-5      None    
 21/07 PM   4.7/ 5.2   1.2/ 1.7   1.0/ 1.5    6-7      None    
 22/08 AM   5.0/ 5.5   1.5/ 2.0   1.4/ 1.9    7-8      None    
 22/08 PM   5.2/ 5.7   1.7/ 2.2   1.4/ 1.9    3-4      None    
 23/09 AM   4.5/ 5.0   1.0/ 1.5   0.8/ 1.3    2-3      None    
 23/09 PM   4.2/ 4.7   0.8/ 1.3   0.5/ 1.0     2       None

&&

$$

RIZ008-221000-
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Block Island RI-
103 PM EDT Thu Aug 21 2025

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT SATURDAY...
...COASTAL FLOOD ADVISORY IN EFFECT FROM 6 AM TO 10 AM EDT
FRIDAY...
...COASTAL FLOOD ADVISORY IN EFFECT FROM 6 PM TO 10 PM EDT
FRIDAY...

* WHAT...Large breaking waves of 10 to 15 feet. Flooding of up to
  one foot deep on vulnerable coastal roads and some debris on
  roadways around high tide Friday morning and Friday evening.

* WHERE...Block Island RI.

* WHEN...For the High Surf Advisory, until 8 PM EDT Saturday. For
  the Coastal Flood Advisory, for high tides Friday morning and
  Friday evening.

* IMPACTS...Flooding up to one foot deep around high tide on 
  vulnerable roads, parking lots, and parks. Dangerous swimming 
  and surfing conditions. Significant beach and dune erosion.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive around barricades or through water of unknown depth
during high tide. Take the necessary actions to protect flood- 
prone property.

Many ocean beaches are closed. Stay out out of the water due to 
dangerous surf conditions. Only view surf at a safe distance, not
from jetties or piers.

&&

&&

Time of high total tides are approximate to the nearest hour.

Block Island at Old Harbor
MLLW Categories - Minor 6.0 ft, Moderate 7.5 ft, Major 9.0 ft
MHHW Categories - Minor 2.8 ft, Moderate 4.3 ft, Major 5.8 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/07 AM   3.7/ 4.2   0.6/ 1.1   0.7/ 1.1    8-9      None    
 21/07 PM   4.7/ 5.2   1.5/ 2.0   1.2/ 1.7   11-13     None    
 22/07 AM   4.7/ 5.2   1.6/ 2.0   1.6/ 2.0   13-15     None    
 22/08 PM   5.0/ 5.5   1.8/ 2.2   1.4/ 1.9    7-8      Minor    
 23/08 AM   4.2/ 4.7   1.0/ 1.5   0.8/ 1.3    5-6      None    
 23/08 PM   3.9/ 4.4   0.7/ 1.1   0.5/ 1.0     5       None

&&

$$

RIZ002-004-005-221000-
/O.NEW.KBOX.CF.Y.0006.250822T1000Z-250822T1400Z/
/O.EXB.KBOX.CF.Y.0004.250822T2200Z-250823T0200Z/
Southeast Providence RI-Eastern Kent RI-Bristol RI-
103 PM EDT Thu Aug 21 2025

...COASTAL FLOOD ADVISORY IN EFFECT FROM 6 AM TO 10 AM EDT
FRIDAY...
...COASTAL FLOOD ADVISORY IN EFFECT FROM 6 PM TO 10 PM EDT
FRIDAY...

* WHAT...Flooding of up to one foot deep on vulnerable coastal
  roads around high tide Friday morning and Friday evening.

* WHERE...Locations around Narragansett Bay.

* WHEN...High tides Friday morning and Friday evening.

* IMPACTS...Flooding up to one foot deep on vulnerable roads,
  parking lots, and parks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive around barricades or through water of unknown depth
during high tide. Take the necessary actions to protect flood- 
prone property.

&&

&&

Time of high total tides are approximate to the nearest hour.

Narragansett Bay at Fox Point
MLLW Categories - Minor 7.0 ft, Moderate 9.0 ft, Major 10.5 ft
MHHW Categories - Minor 2.2 ft, Moderate 4.2 ft, Major 5.7 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/07 AM   4.7/ 5.2   0.0/ 0.5   0.8/ 1.3    1-2      None    
 21/08 PM   6.1/ 6.6   1.3/ 1.8   1.1/ 1.6     3       None    
 22/09 AM   5.5/ 6.0   0.7/ 1.1   1.5/ 2.0     3       None    
 22/08 PM   6.6/ 7.1   1.8/ 2.2   1.6/ 2.0    1-2      None    
 23/08 AM   5.0/ 5.5   0.2/ 0.7   1.0/ 1.5     1       None    
 23/09 PM   5.7/ 6.2   0.9/ 1.4   0.8/ 1.3    1-2      None

Narragansett Bay at Conimicut Point
MLLW Categories - Minor 7.0 ft, Moderate 8.5 ft, Major 10.0 ft
MHHW Categories - Minor 2.4 ft, Moderate 3.9 ft, Major 5.4 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/07 AM   5.2/ 5.7   0.7/ 1.1   0.8/ 1.3     2       None    
 21/08 PM   6.1/ 6.6   1.5/ 2.0   1.1/ 1.6     3       None    
 22/08 AM   6.2/ 6.7   1.6/ 2.0   1.4/ 1.9     3       None    
 22/08 PM   6.6/ 7.1   2.0/ 2.5   1.6/ 2.0     1       None    
 23/09 AM   5.7/ 6.2   1.2/ 1.7   0.9/ 1.4     1       None    
 23/09 PM   5.5/ 6.0   0.9/ 1.4   0.7/ 1.1    1-2      None

Mount Hope Bay near Bristol Point RI
MLLW Categories - Minor 7.0 ft, Moderate 9.5 ft, Major 12.0 ft
MHHW Categories - Minor 2.5 ft, Moderate 5.0 ft, Major 7.5 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/07 AM   4.9/ 5.4   0.4/ 0.9   0.8/ 1.3     2       None    
 21/08 PM   6.0/ 6.5   1.5/ 2.0   1.1/ 1.6     3       None    
 22/08 AM   5.7/ 6.2   1.2/ 1.7   1.4/ 1.9     3       None    
 22/08 PM   6.5/ 7.0   2.0/ 2.5   1.5/ 2.0    1-2      None    
 23/09 AM   5.2/ 5.7   0.7/ 1.1   0.9/ 1.4     1       None    
 23/09 PM   5.6/ 6.1   1.1/ 1.6   0.7/ 1.1    1-2      None

Narragansett Bay at Quonset Point
MLLW Categories - Minor 6.0 ft, Moderate 7.5 ft, Major 9.5 ft
MHHW Categories - Minor 1.9 ft, Moderate 3.4 ft, Major 5.4 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/07 AM   4.9/ 5.4   0.8/ 1.3   0.8/ 1.3     2       None    
 21/07 PM   5.6/ 6.1   1.5/ 2.0   1.1/ 1.6     3       None    
 22/08 AM   5.7/ 6.2   1.7/ 2.2   1.5/ 2.0     3      Minor    
 22/08 PM   6.0/ 6.5   1.9/ 2.3   1.5/ 2.0    1-2     Minor    
 23/09 AM   5.2/ 5.7   1.1/ 1.6   0.8/ 1.3     1       None    
 23/09 PM   5.1/ 5.6   1.0/ 1.5   0.6/ 1.1     1       None

&&

$$

MAZ023-024-221000-
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/O.CON.KBOX.CF.Y.0004.250823T0200Z-250823T0600Z/
Dukes MA-Nantucket MA-
103 PM EDT Thu Aug 21 2025

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT SATURDAY...
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT FROM 10 PM THIS
EVENING TO 2 AM EDT FRIDAY...
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT FROM 10 PM FRIDAY TO
2 AM EDT SATURDAY...

* WHAT...Large breaking waves of 15 to 20 feet on south coastal
  beaches. Flooding of up to one foot deep on vulnerable coastal
  roads around high tide late tonight and late Friday night.

* WHERE...Marthas Vineyard and Nantucket.

* WHEN...For the High Surf Advisory, until 8 PM EDT Saturday. For
  the Coastal Flood Advisory, for high tides late tonight and late
  Friday night.

* IMPACTS...Roads remain passable. Low lying areas and roads near
  Nantucket Harbor, including Easy Street, and Edgartown Harbor
  may experience pockets of shallow flooding less than one foot
  deep. Dangerous swimming and surfing conditions and significant 
  beach and dune erosion.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive around barricades or through water of unknown depth
during high tide. Take the necessary actions to protect flood- 
prone property.

Many ocean beaches are closed. Stay out out of the water due to 
dangerous surf conditions. Only view surf at a safe distance, not
from near the shore.

&&

&&

Time of high total tides are approximate to the nearest hour.

Edgartown
MLLW Categories - Minor 4.0 ft, Moderate 5.0 ft, Major 7.0 ft
MHHW Categories - Minor 1.3 ft, Moderate 2.3 ft, Major 4.3 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/11 AM   2.7/ 3.2   0.0/ 0.5   0.6/ 1.1    5-6      None    
 21/11 PM   4.2/ 4.7   1.5/ 2.0   1.3/ 1.8    7-8     Minor    
 22/12 PM   3.6/ 4.1   0.9/ 1.4   1.5/ 2.0    6-7      None    
 23/12 AM   3.7/ 4.2   1.1/ 1.6   1.1/ 1.6     4      Minor    
 23/01 PM   2.7/ 3.2   0.0/ 0.5   0.6/ 1.1     3       None    
 24/01 AM   2.8/ 3.4   0.2/ 0.7   0.2/ 0.8     3       None

Vineyard Haven
MLLW Categories - Minor 4.5 ft, Moderate 6.0 ft, Major 7.0 ft
MHHW Categories - Minor 2.5 ft, Moderate 4.0 ft, Major 5.0 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/10 AM   2.2/ 2.7   0.2/ 0.8   0.6/ 1.1     4       None    
 21/11 PM   3.2/ 3.7   1.3/ 1.8   1.2/ 1.7    5-6      None    
 22/12 PM   3.2/ 3.7   1.2/ 1.7   1.4/ 1.9     5       None    
 22/11 PM   3.2/ 3.7   1.2/ 1.7   1.2/ 1.7     3       None    
 23/12 PM   2.5/ 3.0   0.5/ 1.0   0.7/ 1.1    2-3      None    
 23/11 PM   2.3/ 2.8   0.4/ 0.9   0.7/ 1.1     2       None

Nantucket Harbor
MLLW Categories - Minor 5.0 ft, Moderate 6.5 ft, Major 8.0 ft
MHHW Categories - Minor 1.4 ft, Moderate 2.9 ft, Major 4.4 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/11 AM   3.4/ 3.9  -0.2/ 0.2   0.5/ 1.0    6-7      None    
 22/12 AM   5.2/ 5.7   1.6/ 2.0   1.2/ 1.7   9-10     Minor    
 22/12 PM   4.5/ 5.0   0.9/ 1.4   1.5/ 2.0    8-9      None    
 23/12 AM   4.9/ 5.4   1.3/ 1.8   1.1/ 1.6     7      Minor    
 23/01 PM   3.7/ 4.2   0.1/ 0.6   0.6/ 1.1     5       None    
 24/02 AM   4.0/ 4.5   0.4/ 0.9   0.2/ 0.8     4       None

&&

$$

MAZ022-221000-
/O.NEW.KBOX.CF.S.0004.250821T2200Z-250823T0600Z/
/O.CON.KBOX.SU.Y.0001.000000T0000Z-250824T0000Z/
Barnstable MA-
103 PM EDT Thu Aug 21 2025

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT SATURDAY...
...COASTAL FLOOD STATEMENT IN EFFECT FROM 6 PM EDT THIS EVENING
THROUGH LATE FRIDAY NIGHT...

* WHAT...Large breaking waves of 10 to 15 feet on ocean beaches.
  Some splashover on vulnerable coastal roads around high tide
  tonight through Friday night.

* WHERE...Cape Cod.

* WHEN...For the High Surf Advisory, until 8 PM EDT Saturday. 

* IMPACTS...Some water on low lying roads and property around high
  tide. Dangerous swimming and surfing conditions and significant
  beach erosion.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Many ocean beaches are closed. Stay out out of the water due to 
dangerous surf conditions. Only view surf at a safe distance, not 
from near the shore, or from jetties or piers.

Avoid any flooded roads during high tide.

&&

&&

Time of high total tides are approximate to the nearest hour.

Buzzards Bay at Woods Hole
MLLW Categories - Minor 5.5 ft, Moderate 7.0 ft, Major 8.5 ft
MHHW Categories - Minor 3.5 ft, Moderate 5.0 ft, Major 6.5 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/07 AM   2.5/ 3.0   0.5/ 1.0   0.6/ 1.1     4       None    
 21/08 PM   3.5/ 4.0   1.5/ 2.0   1.0/ 1.5    5-6      None    
 22/08 AM   3.4/ 3.9   1.4/ 1.9   1.4/ 1.9    5-6      None    
 22/08 PM   3.9/ 4.4   1.9/ 2.3   1.4/ 1.9    3-4      None    
 23/09 AM   2.7/ 3.2   0.8/ 1.3   0.7/ 1.1    2-3      None    
 23/09 PM   2.7/ 3.2   0.8/ 1.3   0.4/ 0.9     2       None

Chatham MA - East Coast
MLLW Categories - Minor 9.0 ft, Moderate 11.5 ft, Major 13.0 ft
MHHW Categories - Minor 3.8 ft, Moderate 6.3 ft, Major 7.8 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/10 AM   4.5/ 5.0  -0.8/-0.2   0.5/ 1.0    4-5      None    
 22/12 AM   6.0/ 6.5   0.8/ 1.3   1.0/ 1.5    7-8      None    
 22/11 AM   5.4/ 5.9   0.2/ 0.7   1.4/ 1.9   9-10      None    
 22/11 PM   6.1/ 6.6   0.9/ 1.4   1.1/ 1.6    7-8      None    
 23/01 PM   5.5/ 6.0   0.2/ 0.8   0.5/ 1.0     6       None    
 24/12 AM   5.4/ 5.9   0.2/ 0.7   0.4/ 0.9    4-5      None

Chatham - South side
MLLW Categories - Minor 9.0 ft, Moderate 10.5 ft, Major 11.5 ft
MHHW Categories - Minor 4.5 ft, Moderate 6.0 ft, Major 7.0 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/12 PM   4.0/ 4.5  -0.5/ 0.0   0.4/ 0.9    4-5      None    
 22/12 AM   5.7/ 6.2   1.2/ 1.7   0.8/ 1.3    6-7      None    
 22/01 PM   5.0/ 5.5   0.5/ 1.0   1.2/ 1.7    7-8      None    
 23/12 AM   5.7/ 6.2   1.2/ 1.7   1.1/ 1.6     6       None    
 23/01 PM   4.4/ 4.9  -0.2/ 0.3   0.6/ 1.1     5       None    
 24/01 AM   4.7/ 5.2   0.2/ 0.7   0.2/ 0.7     4       None

Provincetown Harbor
MLLW Categories - Minor 13.0 ft, Moderate 14.0 ft, Major 15.0 ft
MHHW Categories - Minor 2.9 ft, Moderate 3.9 ft, Major 4.9 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/10 AM   9.3/ 9.8  -0.9/-0.4   0.6/ 1.1     3       None    
 21/11 PM  11.0/11.5   0.9/ 1.4   0.7/ 1.1    4-5      None    
 22/11 AM  10.3/10.8   0.2/ 0.7   1.3/ 1.8    7-8      None    
 23/12 AM  11.5/12.0   1.4/ 1.9   1.1/ 1.6    6-7      None    
 23/12 PM  10.0/10.5  -0.2/ 0.3   0.6/ 1.1     5       None    
 24/12 AM  10.8/11.3   0.7/ 1.1   0.5/ 1.0     4       None

Dennis - Sesuit Harbor
MLLW Categories - Minor 13.0 ft, Moderate 14.5 ft, Major 16.0 ft
MHHW Categories - Minor 2.5 ft, Moderate 4.0 ft, Major 5.5 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/10 AM  10.1/10.6  -0.5/ 0.0   0.8/ 1.3     3       None    
 21/11 PM  11.8/12.3   1.3/ 1.8   0.8/ 1.3    3-4      None    
 22/11 AM  11.3/11.8   0.8/ 1.3   1.6/ 2.0     5       None    
 23/12 AM  12.0/12.5   1.5/ 2.0   1.1/ 1.6     4       None    
 23/12 PM  10.6/11.1   0.1/ 0.6   0.7/ 1.1     3       None    
 24/12 AM  11.3/11.8   0.8/ 1.3   0.6/ 1.1    2-3      None

Sandwich Harbor
MLLW Categories - Minor 12.0 ft, Moderate 14.0 ft, Major 15.0 ft
MHHW Categories - Minor 1.7 ft, Moderate 3.7 ft, Major 4.7 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/10 AM   8.7/ 9.2  -1.7/-1.2   0.9/ 1.4     3       None    
 21/11 PM  10.2/10.7  -0.2/ 0.3   0.9/ 1.4     3       None    
 22/11 AM   9.7/10.2  -0.7/-0.2   1.6/ 2.0     4       None    
 22/11 PM  10.3/10.8   0.0/ 0.5   1.1/ 1.6    2-3      None    
 23/12 PM   8.9/ 9.4  -1.5/-1.0   0.6/ 1.1     2       None    
 24/12 AM   9.6/10.1  -0.8/-0.2   0.5/ 1.0     2       None

Wings Neck
MLLW Categories - Minor 6.5 ft, Moderate 9.0 ft, Major 11.5 ft
MHHW Categories - Minor 2.1 ft, Moderate 4.6 ft, Major 7.1 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/07 AM   4.2/ 4.7  -0.2/ 0.3   0.6/ 1.1     3       None    
 21/07 PM   5.2/ 5.7   0.8/ 1.3   0.8/ 1.3     3       None    
 22/08 AM   5.4/ 5.9   1.0/ 1.5   1.3/ 1.8     3       None    
 22/08 PM   5.7/ 6.2   1.4/ 1.9   1.4/ 1.9    2-3      None    
 23/09 AM   5.1/ 5.6   0.7/ 1.1   0.9/ 1.4     1       None    
 23/09 PM   5.1/ 5.6   0.7/ 1.1   0.7/ 1.1     2       None

&&

$$

MAZ007-019-221000-
/O.NEW.KBOX.CF.S.0004.250821T2200Z-250823T0600Z/
/O.CON.KBOX.SU.Y.0001.250821T1800Z-250824T0000Z/
Eastern Essex MA-Eastern Plymouth MA-
103 PM EDT Thu Aug 21 2025

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT SATURDAY...
...COASTAL FLOOD STATEMENT IN EFFECT FROM 6 PM EDT THIS EVENING
THROUGH LATE FRIDAY NIGHT...

* WHAT...Large breaking waves of 10 to 15 feet on ocean beaches.
  Some splashover on vulnerable coastal roads around high tide
  tonight through Friday night.

* WHERE...Eastern Massachusetts coast.

* WHEN...For the High Surf Advisory, until 8 PM EDT Saturday. 
 
* IMPACTS...Some water on low lying roads and property around high
  tide. Dangerous swimming and surfing conditions and significant
  beach erosion.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Many ocean beaches are closed. Stay out out of the water due to 
dangerous surf conditions. Only view surf at a safe distance, not 
from near the shore, or from jetties or piers.

Avoid any flooded roads during high tide.

&&

&&

Time of high total tides are approximate to the nearest hour.

Gloucester Harbor
MLLW Categories - Minor 11.5 ft, Moderate 13.0 ft, Major 15.0 ft
MHHW Categories - Minor 1.9 ft, Moderate 3.4 ft, Major 5.4 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/11 AM   8.9/ 9.4  -0.8/-0.2   0.4/ 0.9    2-3      None    
 21/11 PM  10.8/11.3   1.2/ 1.7   0.7/ 1.1    4-5      None    
 22/11 AM  10.0/10.5   0.4/ 0.9   1.3/ 1.8    7-8      None    
 23/12 AM  11.2/11.7   1.6/ 2.0   1.1/ 1.6     7       None    
 23/12 PM   9.6/10.1   0.0/ 0.5   0.6/ 1.1     6       None    
 24/12 AM  10.2/10.7   0.6/ 1.1   0.2/ 0.8    5-6      None

Merrimack River near Newburyport MA
MLLW Categories - Minor 11.0 ft, Moderate 12.0 ft, Major 13.5 ft
MHHW Categories - Minor 1.5 ft, Moderate 2.5 ft, Major 4.0 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/11 AM   8.0/ 8.5  -1.6/-1.1   0.4/ 0.9    2-3      None    
 21/11 PM   9.8/10.3   0.2/ 0.8   0.7/ 1.1    3-4      None    
 22/11 AM   9.0/ 9.5  -0.6/-0.1   1.3/ 1.8     5       None    
 23/12 AM  10.1/10.6   0.6/ 1.1   1.1/ 1.6    5-6      None    
 23/12 PM   8.7/ 9.2  -0.9/-0.4   0.7/ 1.1     4       None    
 24/12 AM   9.1/ 9.6  -0.5/ 0.0   0.4/ 0.9     4       None

Scituate MA
MLLW Categories - Minor 11.5 ft, Moderate 13.5 ft, Major 15.5 ft
MHHW Categories - Minor 1.8 ft, Moderate 3.8 ft, Major 5.8 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/10 AM   9.2/ 9.7  -0.6/-0.1   0.7/ 1.1    2-3      None    
 21/11 PM  11.0/11.5   1.3/ 1.8   0.8/ 1.3    3-4      None    
 22/11 AM  10.1/10.6   0.4/ 0.9   1.3/ 1.8     6       None    
 23/12 AM  11.2/11.7   1.5/ 2.0   1.1/ 1.6    5-6      None    
 23/12 PM   9.7/10.2   0.0/ 0.5   0.6/ 1.1     5       None    
 24/12 AM  10.4/10.9   0.7/ 1.1   0.5/ 1.0    4-5      None

&&

$$

MAZ021-221000-
/O.CON.KBOX.SU.Y.0001.000000T0000Z-250824T0000Z/
Southern Plymouth MA-
103 PM EDT Thu Aug 21 2025

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT SATURDAY...

* WHAT...Large breaking waves of up to 4 feet in the surf zone.

* WHERE...Southern Plymouth MA County.

* WHEN...Until 8 PM EDT Saturday.

* IMPACTS...Dangerous swimming and surfing conditions and 
  localized beach erosion.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced swimmers should remain out of the water due to
dangerous surf conditions.

&&

$$

MAZ015-016-221000-
/O.NEW.KBOX.CF.S.0004.250821T2200Z-250823T0600Z/
Suffolk MA-Eastern Norfolk MA-
103 PM EDT Thu Aug 21 2025

...COASTAL FLOOD STATEMENT IN EFFECT FROM 6 PM EDT THIS EVENING
THROUGH LATE FRIDAY NIGHT...

* WHAT...Large breaking waves of 10 to 15 feet on ocean beaches.
  Some splashover on vulnerable coastal roads around high tide
  tonight through Friday night.

* WHERE...Boston and nearby coastal communities.

* WHEN...High tides late tonight through Friday night.

* IMPACTS...Some water on the lowest lying roads and property.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive through flooded roadways.

&&

&&

Time of high total tides are approximate to the nearest hour.

Boston Harbor
MLLW Categories - Minor 12.5 ft, Moderate 14.0 ft, Major 15.0 ft
MHHW Categories - Minor 2.2 ft, Moderate 3.7 ft, Major 4.7 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/10 AM   9.6/10.1  -0.8/-0.2   0.6/ 1.1     2       None    
 21/11 PM  11.4/11.9   1.1/ 1.6   0.8/ 1.3     2       None    
 22/11 AM  10.7/11.2   0.4/ 0.9   1.3/ 1.8     2       None    
 22/11 PM  11.6/12.1   1.3/ 1.8   1.1/ 1.6     1       None    
 23/12 PM  10.4/10.9   0.1/ 0.6   0.7/ 1.1    1-2      None    
 24/12 AM  10.9/11.4   0.6/ 1.1   0.4/ 0.9     2       None

Revere
MLLW Categories - Minor 12.5 ft, Moderate 14.5 ft, Major 16.0 ft
MHHW Categories - Minor 2.6 ft, Moderate 4.6 ft, Major 6.1 ft

             Total      Total    Departure                   
 Day/Time    Tide       Tide     from Norm   Waves    Flood  
            ft MLLW    ft MHHW       ft       ft      Impact 
 --------  ---------  ---------  ---------  -------  --------
 21/11 AM   9.3/ 9.8  -0.7/-0.2   0.4/ 0.9    1-2      None    
 21/11 PM  11.2/11.7   1.3/ 1.8   0.8/ 1.3     2       None    
 22/11 AM  10.4/10.9   0.5/ 1.0   1.3/ 1.8     2       None    
 22/11 PM  11.3/11.8   1.4/ 1.9   1.1/ 1.6     1       None    
 23/12 PM  10.1/10.6   0.2/ 0.7   0.6/ 1.1     1       None    
 24/12 AM  10.5/11.0   0.6/ 1.1   0.2/ 0.8    1-2      None

&&

$$

Source: BOX continues High Surf Advisory for Eastern Essex, Eastern Plymouth [MA] till Aug 23, 8:00 PM EDT

----------------
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