High Surf Advisory
Coastal Hazard Message
National Weather Service Boston/Norton MA
103 PM EDT Thu Aug 21 2025
RIZ008-221000-
/O.NEW.KBOX.CF.Y.0006.250822T1000Z-250822T1400Z/
/O.EXB.KBOX.CF.Y.0004.250822T2200Z-250823T0200Z/
/O.CON.KBOX.SU.Y.0001.000000T0000Z-250824T0000Z/
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
&&
$$
Coastal Hazard Message
National Weather Service Boston/Norton MA
103 PM EDT Thu Aug 21 2025
MAZ023-024-221000-
/O.CON.KBOX.SU.Y.0001.000000T0000Z-250824T0000Z/
/O.CON.KBOX.CF.Y.0005.250822T0200Z-250822T0600Z/
/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
&&
$$
Coastal Hazard Message
National Weather Service Boston/Norton MA
103 PM EDT Thu Aug 21 2025
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
&&
$$
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
&&
$$
Coastal Hazard Message
National Weather Service Boston/Norton MA
103 PM EDT Thu Aug 21 2025
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
&&
$$
Coastal Hazard Message
National Weather Service Boston/Norton MA
103 PM EDT Thu Aug 21 2025
MAZ021-221000-
/O.CON.KBOX.SU.Y.0001.000000T0000Z-250824T0000Z/
Southern Plymouth MA-
103 PM EDT Thu Aug 21 2025
...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT SATURDAY...
* WHAT...Large breaking waves of up to 4 feet in the surf zone.
* WHERE...Southern Plymouth MA County.
* WHEN...Until 8 PM EDT Saturday.
* IMPACTS...Dangerous swimming and surfing conditions and
localized beach erosion.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced swimmers should remain out of the water due to
dangerous surf conditions.
&&
$$
Coastal Hazard Message
National Weather Service Gray ME
127 PM EDT Thu Aug 21 2025
MEZ023>027-NHZ014-220800-
/O.NEW.KGYX.CF.Y.0002.250823T0200Z-250823T0500Z/
/O.CON.KGYX.SU.Y.0002.250822T1000Z-250824T0000Z/
/O.CON.KGYX.RP.S.0001.000000T0000Z-250822T0000Z/
Coastal York-Coastal Cumberland-Sagadahoc-Lincoln-Knox-
Coastal Rockingham-
127 PM EDT Thu Aug 21 2025
...HIGH RIP CURRENT RISK REMAINS IN EFFECT UNTIL 8 PM EDT THIS
EVENING...
...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 6 AM FRIDAY TO 8 PM
EDT SATURDAY...
...COASTAL FLOOD ADVISORY IN EFFECT FROM 10 PM FRIDAY TO 1 AM EDT
SATURDAY...
* WHAT...For the High Rip Current Risk, a high risk of dangerous
rip currents. For the High Surf Advisory, large breaking waves
of 6 to 10 feet and a high risk of dangerous rip currents. For
the Coastal Flood Advisory, minor coastal flooding and splash-
over.
* WHERE...In Maine, Coastal York, Coastal Cumberland, Sagadahoc,
Lincoln and Knox Counties. In New Hampshire, Coastal
Rockingham County.
* WHEN...For the High Rip Current Risk, until 8 PM EDT this
evening. For the High Surf Advisory, from 6 AM Friday to 8 PM
EDT Saturday. For the Coastal Flood Advisory, from 10 PM
Friday to 1 AM EDT Saturday.
* IMPACTS...Flooding of lots, parks, and roads with only
isolated road closures expected. Dangerous swimming and
surfing conditions and localized beach erosion. Rip currents
can sweep even the best swimmers away from shore into deeper
water.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If travel is required, allow extra time as some roads may be
closed. Do not drive around barricades or through water of
unknown depth. Take the necessary actions to protect flood-prone
property.
Inexperienced swimmers should remain out of the water due to
dangerous surf conditions.
Large waves can present a danger to people on rocks above the
water. Stay away from rock outcrops along the shoreline exposed
to ocean waves...as waves can easily sweep people into the cold
ocean water.
&&
Time of high total tides are approximate to the nearest hour.
Seavey Island / Portsmouth NH
MLLW Categories - Minor 11.5 ft, Moderate 12.5 ft, Major 13.5 ft
MHHW Categories - Minor 2.6 ft, Moderate 3.6 ft, Major 4.6 ft
Total Total Departure
Day/Time Tide Tide from Norm Waves Flood
ft MLLW ft MHHW ft ft Impact
-------- --------- --------- --------- ------- --------
21/11 AM 8.6 -0.3 0.6 2-3 None
21/11 PM 10.4 1.5 1.0 3-4 None
22/12 PM 9.9 1.0 1.7 5-6 None
23/12 AM 11.0 2.1 1.6 6 None
23/12 PM 9.4 0.5 1.0 6 None
24/12 AM 9.5 0.6 0.3 6 None
Hampton Harbor NH
MLLW Categories - Minor 11.0 ft, Moderate 12.0 ft, Major 13.0 ft
MHHW Categories - Minor 1.4 ft, Moderate 2.4 ft, Major 3.4 ft
Total Total Departure
Day/Time Tide Tide from Norm Waves Flood
ft MLLW ft MHHW ft ft Impact
-------- --------- --------- --------- ------- --------
21/11 AM 8.6 -1.0 0.5 1 None
21/11 PM 10.6 1.0 1.1 3-4 None
22/11 AM 10.0 0.4 1.7 4-5 None
23/12 AM 11.1 1.5 1.6 5-6 Minor
23/12 PM 9.5 -0.1 1.0 6 None
24/12 AM 9.7 0.1 0.3 5-6 None
Portland ME
MLLW Categories - Minor 12.0 ft, Moderate 13.0 ft, Major 14.0 ft
MHHW Categories - Minor 2.1 ft, Moderate 3.1 ft, Major 4.1 ft
Total Total Departure
Day/Time Tide Tide from Norm Waves Flood
ft MLLW ft MHHW ft ft Impact
-------- --------- --------- --------- ------- --------
21/11 AM 9.4 -0.5 0.7 1 None
21/11 PM 11.3 1.4 1.0 3 None
22/11 AM 10.8 0.9 1.7 5 None
22/11 PM 12.2 2.3 1.9 6-7 Minor
23/12 PM 10.5 0.6 1.1 5-6 None
24/12 AM 10.8 0.9 0.5 4-5 None
Arrowsic Test Point
MLLW Categories - Minor 11.5 ft, Moderate 12.5 ft, Major 13.5 ft
MHHW Categories - Minor 3.7 ft, Moderate 4.7 ft, Major 5.7 ft
Total Total Departure
Day/Time Tide Tide from Norm Waves Flood
ft MLLW ft MHHW ft ft Impact
-------- --------- --------- --------- ------- --------
21/11 AM 8.4 0.6 0.6 0 None
21/11 PM 10.2 2.4 1.0 0 None
22/12 PM 9.8 2.0 1.7 0 None
23/12 AM 11.2 3.4 2.0 0 None
23/12 PM 9.6 1.8 1.3 0 None
24/01 AM 9.8 2.0 0.7 0 None
Bath ME
MLLW Categories - Minor 9.5 ft, Moderate 11.0 ft, Major 12.0 ft
MHHW Categories - Minor 2.1 ft, Moderate 3.6 ft, Major 4.6 ft
Total Total Departure
Day/Time Tide Tide from Norm Waves Flood
ft MLLW ft MHHW ft ft Impact
-------- --------- --------- --------- ------- --------
21/11 AM 7.3 -0.1 0.6 0 None
21/11 PM 9.0 1.6 1.0 0 None
22/12 PM 8.6 1.2 1.7 0 None
23/12 AM 10.0 2.6 2.0 0 Minor
23/01 PM 8.4 1.0 1.3 0 None
24/01 AM 8.7 1.3 0.8 0 None
Boothbay Harbor ME
MLLW Categories - Minor 13.0 ft, Moderate 14.0 ft, Major 15.0 ft
MHHW Categories - Minor 3.3 ft, Moderate 4.3 ft, Major 5.3 ft
Total Total Departure
Day/Time Tide Tide from Norm Waves Flood
ft MLLW ft MHHW ft ft Impact
-------- --------- --------- --------- ------- --------
21/10 PM 10.9 1.2 1.0 2-3 None
22/11 AM 10.6 0.9 1.8 3-4 None
22/11 PM 12.0 2.3 2.0 3-4 None
23/12 PM 10.2 0.5 1.2 2 None
24/12 AM 10.6 0.9 0.6 2 None
Saint George
MLLW Categories - Minor 12.5 ft, Moderate 13.5 ft, Major 14.5 ft
MHHW Categories - Minor 2.6 ft, Moderate 3.6 ft, Major 4.6 ft
Total Total Departure
Day/Time Tide Tide from Norm Waves Flood
ft MLLW ft MHHW ft ft Impact
-------- --------- --------- --------- ------- --------
21/10 PM 11.1 1.2 0.9 4-5 None
22/11 AM 10.7 0.8 1.7 7-8 None
22/11 PM 12.2 2.3 2.0 7-8 None
23/12 PM 10.4 0.5 1.2 4-5 None
24/12 AM 10.9 1.0 0.7 3 None
&&
$$
