Coastal Flood Warnings/Watches/Statements
Issued by NWS Boston, MA
Issued by NWS Boston, MA
821
WHUS41 KBOX 121818
CFWBOX
Coastal Hazard Message
National Weather Service Boston/Norton MA
218 PM EDT Sun Oct 12 2025
RIZ006>008-130800-
/O.CAN.KBOX.CF.Y.0007.000000T0000Z-251012T1900Z/
/O.NEW.KBOX.CF.Y.0008.251013T0400Z-251013T0800Z/
Washington RI-Newport RI-Block Island RI-
218 PM EDT Sun Oct 12 2025
...COASTAL FLOOD ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 4 AM
EDT MONDAY...
* WHAT...Up to one foot of inundation above ground level expected
in low-lying areas near shorelines and tidal waterways (4.7 to
5.6 feet Mean Lower Low Water).
* WHERE...Washington, and Newport RI Counties.
* WHEN...From midnight tonight to 4 AM EDT Monday.
* IMPACTS...Flooding of lots, parks, and roads with only
isolated road closures expected.
* ADDITIONAL DETAILS...Mainly the ocean exposed coastline of Rhode
Island will be impacted with minor inundation at high tide.
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.
&&
&&
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
-------- --------- --------- --------- ------- --------
12/02 PM 4.7/ 5.2 1.7/ 2.2 1.6/ 2.0 5-6 None
13/03 AM 5.0/ 5.5 2.0/ 2.5 2.7/ 3.2 9 Minor
13/02 PM 4.9/ 5.4 1.9/ 2.3 2.1/ 2.6 9 Minor
14/02 AM 3.7/ 4.2 0.7/ 1.1 1.8/ 2.2 7-8 None
14/03 PM 3.9/ 4.4 0.9/ 1.4 1.3/ 1.8 5 None
15/03 AM 3.5/ 4.0 0.5/ 1.0 1.5/ 2.0 4 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
-------- --------- --------- --------- ------- --------
12/01 PM 5.2/ 5.7 1.4/ 1.9 1.2/ 1.7 3 None
13/01 AM 5.6/ 6.1 1.7/ 2.2 2.1/ 2.6 3 None
13/02 PM 5.6/ 6.1 1.7/ 2.2 1.7/ 2.2 3 None
14/02 AM 4.6/ 5.1 0.7/ 1.1 1.2/ 1.7 3 None
14/03 PM 4.6/ 5.1 0.7/ 1.1 0.9/ 1.4 3 None
15/03 AM 4.5/ 5.0 0.6/ 1.1 1.1/ 1.6 2-3 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
-------- --------- --------- --------- ------- --------
12/01 PM 5.0/ 5.5 1.5/ 2.0 1.2/ 1.7 5-6 None
13/01 AM 5.2/ 5.7 1.8/ 2.2 2.1/ 2.6 8 None
13/02 PM 5.2/ 5.7 1.8/ 2.2 1.7/ 2.2 8 None
14/02 AM 4.2/ 4.7 0.8/ 1.3 1.2/ 1.7 6-7 None
14/02 PM 4.2/ 4.7 0.8/ 1.3 1.0/ 1.5 5 None
15/03 AM 4.0/ 4.5 0.6/ 1.1 1.0/ 1.5 3-4 None
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
-------- --------- --------- --------- ------- --------
12/12 PM 4.6/ 5.1 1.4/ 1.9 1.2/ 1.7 8-9 None
13/01 AM 4.9/ 5.4 1.7/ 2.2 2.2/ 2.7 13-14 None
13/01 PM 5.2/ 5.7 2.0/ 2.5 2.1/ 2.6 14 None
14/02 AM 4.2/ 4.7 1.0/ 1.5 1.5/ 2.0 11-12 None
14/02 PM 4.0/ 4.5 0.9/ 1.4 1.2/ 1.7 8-9 None
15/03 AM 3.9/ 4.4 0.7/ 1.1 1.2/ 1.7 6 None
&&
$$
MAZ023-024-130800-
/O.NEW.KBOX.CF.Y.0008.251013T0800Z-251013T1200Z/
/O.CON.KBOX.CF.Y.0007.000000T0000Z-251012T2200Z/
Dukes MA-Nantucket MA-
218 PM EDT Sun Oct 12 2025
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 6 PM EDT THIS
EVENING...
...COASTAL FLOOD ADVISORY IN EFFECT FROM 4 AM TO 8 AM EDT
MONDAY...
* WHAT...For the first Coastal Flood Advisory, up to one foot of
inundation above ground level in low-lying areas near shorelines
and tidal waterways (3.6 to 5.4 feet Mean Lower Low Water). For
the second Coastal Flood Advisory, up to one half foot of
inundation above ground level expected in low-lying areas near
shorelines and tidal waterways (3.5 to 4.7 feet Mean Lower Low
Water).
* WHERE...Dukes MA and Nantucket MA Counties.
* WHEN...For the first Coastal Flood Advisory, until 6 PM EDT
this evening. For the second Coastal Flood Advisory, from 4 AM
to 8 AM EDT Monday.
* IMPACTS...Roads remain passable. Low lying areas and roads
near Nantucket Harbor, including Easy Street, may experience
pockets of shallow flooding less than one foot deep.
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.
&&
&&
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
-------- --------- --------- --------- ------- --------
12/05 PM 4.2/ 4.7 1.6/ 2.0 1.4/ 1.9 5-7 Minor
13/06 AM 3.9/ 4.4 1.2/ 1.7 1.9/ 2.3 8 Minor
13/06 PM 4.4/ 4.9 1.7/ 2.2 1.5/ 2.0 7-8 Minor
14/06 AM 3.1/ 3.6 0.4/ 0.9 1.1/ 1.6 6 None
14/07 PM 3.7/ 4.2 1.1/ 1.6 1.0/ 1.5 5 Minor
15/08 AM 3.2/ 3.7 0.6/ 1.1 1.1/ 1.6 3-4 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
-------- --------- --------- --------- ------- --------
12/05 PM 3.5/ 4.0 1.5/ 2.0 1.4/ 1.9 4-6 None
13/06 AM 3.4/ 3.9 1.4/ 1.9 1.9/ 2.3 6 None
13/06 PM 3.6/ 4.1 1.6/ 2.0 1.6/ 2.0 6 None
14/06 AM 2.7/ 3.2 0.7/ 1.1 1.1/ 1.6 5 None
14/06 PM 2.8/ 3.4 0.9/ 1.4 1.1/ 1.6 4 None
15/07 AM 2.7/ 3.2 0.7/ 1.1 1.1/ 1.6 2-3 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
-------- --------- --------- --------- ------- --------
12/05 PM 5.2/ 5.7 1.6/ 2.0 1.1/ 1.6 7-9 Minor
13/06 AM 4.6/ 5.1 1.0/ 1.5 1.6/ 2.0 10-11 None
13/06 PM 5.2/ 5.7 1.6/ 2.0 1.2/ 1.7 10 Minor
14/07 AM 4.0/ 4.5 0.4/ 0.9 1.1/ 1.6 7-8 None
14/07 PM 4.9/ 5.4 1.3/ 1.8 1.1/ 1.6 6-7 Minor
15/08 AM 4.2/ 4.7 0.6/ 1.1 1.2/ 1.7 5 None
&&
$$
MAZ007-015-016-019-022-122200-
/O.CON.KBOX.CF.Y.0007.000000T0000Z-251012T2200Z/
Eastern Essex MA-Suffolk MA-Eastern Norfolk MA-
Eastern Plymouth MA-Barnstable MA-
218 PM EDT Sun Oct 12 2025
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 6 PM EDT THIS
EVENING...
* WHAT...Up to one half foot of inundation above ground level in
low- lying areas near shorelines and tidal waterways (3.6 to
12.5 feet Mean Lower Low Water).
* WHERE...Eastern Essex MA, Suffolk MA, Eastern Norfolk MA,
Eastern Plymouth MA and Barnstable MA Counties.
* WHEN...Until 6 PM EDT this evening.
* IMPACTS...Roads remain passable. Shallow pockets of flooding
less than one foot deep affect more vulnerable coastal roads
along the North Shore from Salem and Gloucester to
Newburyport. Rough surf will likely cause some splashover onto
coastal roads around the time of high tide.
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.
&&
&&
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
-------- --------- --------- --------- ------- --------
12/04 PM 11.4/11.9 1.8/ 2.2 0.9/ 1.4 5-7 Minor
13/05 AM 10.0/10.5 0.4/ 0.9 1.3/ 1.8 11-13 None
13/05 PM 11.4/11.9 1.8/ 2.2 1.3/ 1.8 14 Minor
14/06 AM 9.5/10.0 -0.2/ 0.3 1.0/ 1.5 10-12 None
14/06 PM 10.4/10.9 0.8/ 1.3 0.8/ 1.3 7-8 None
15/07 AM 9.2/ 9.7 -0.5/ 0.0 0.8/ 1.3 5 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
-------- --------- --------- --------- ------- --------
12/04 PM 10.3/10.8 0.8/ 1.3 0.9/ 1.4 4-6 None
13/05 AM 9.1/ 9.6 -0.5/ 0.0 1.3/ 1.8 8-10 None
13/05 PM 10.1/10.6 0.6/ 1.1 1.1/ 1.6 10 None
14/06 AM 8.6/ 9.1 -1.0/-0.5 1.0/ 1.5 7-8 None
14/06 PM 9.4/ 9.9 -0.2/ 0.3 0.8/ 1.3 5-6 None
15/07 AM 8.3/ 8.8 -1.3/-0.8 0.8/ 1.3 4 None
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
-------- --------- --------- --------- ------- --------
12/04 PM 11.9/12.4 1.6/ 2.0 1.0/ 1.5 2 None
13/05 AM 10.5/11.0 0.2/ 0.7 1.3/ 1.8 2 None
13/05 PM 11.7/12.2 1.4/ 1.9 1.3/ 1.8 2 None
14/06 AM 9.9/10.4 -0.5/ 0.0 1.0/ 1.5 2 None
14/06 PM 10.8/11.3 0.5/ 1.0 0.9/ 1.4 1-2 None
15/07 AM 9.7/10.2 -0.7/-0.2 0.9/ 1.4 1 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
-------- --------- --------- --------- ------- --------
12/04 PM 11.6/12.1 1.7/ 2.2 0.9/ 1.4 2 None
13/05 AM 10.1/10.6 0.2/ 0.7 1.2/ 1.7 2 None
13/05 PM 11.4/11.9 1.5/ 2.0 1.2/ 1.7 2 None
14/06 AM 9.6/10.1 -0.3/ 0.2 1.0/ 1.5 2 None
14/06 PM 10.6/11.1 0.7/ 1.1 0.9/ 1.4 1-2 None
15/07 AM 9.4/ 9.9 -0.6/-0.1 0.9/ 1.4 1 None
Green Harbor
MLLW Categories - Minor 11.5 ft, Moderate 13.5 ft, Major 15.5 ft
MHHW Categories - Minor 1.6 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
-------- --------- --------- --------- ------- --------
12/04 PM 11.8/12.3 1.9/ 2.3 1.0/ 1.5 3-4 Minor
13/05 AM 10.7/11.2 0.8/ 1.3 1.7/ 2.2 6-7 None
13/05 PM 12.7/13.2 2.7/ 3.2 2.3/ 2.8 7-8 Minor
14/06 AM 10.0/10.5 0.1/ 0.6 1.3/ 1.8 6-7 None
14/06 PM 10.9/11.4 1.0/ 1.5 1.0/ 1.5 5 None
15/07 AM 9.6/10.1 -0.3/ 0.2 1.0/ 1.5 3 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
-------- --------- --------- --------- ------- --------
12/04 PM 11.5/12.0 1.8/ 2.2 1.0/ 1.5 4-5 Minor
13/05 AM 10.2/10.7 0.5/ 1.0 1.5/ 2.0 9-11 None
13/05 PM 11.6/12.1 1.9/ 2.3 2.5/ 3.0 12 Minor
14/06 AM 9.7/10.2 0.0/ 0.5 1.2/ 1.7 8-11 None
14/06 PM 10.5/11.0 0.8/ 1.3 0.9/ 1.4 6-7 None
15/07 AM 9.4/ 9.9 -0.3/ 0.2 0.9/ 1.4 4 None
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
-------- --------- --------- --------- ------- --------
12/01 PM 3.6/ 4.1 1.6/ 2.0 1.1/ 1.6 4-5 None
13/02 AM 3.5/ 4.0 1.5/ 2.0 1.9/ 2.3 6 None
13/02 PM 3.9/ 4.4 1.9/ 2.3 1.6/ 2.0 6 None
14/02 AM 2.7/ 3.2 0.7/ 1.1 1.2/ 1.7 5 None
14/03 PM 3.1/ 3.6 1.1/ 1.6 1.0/ 1.5 4 None
15/03 AM 2.5/ 3.0 0.5/ 1.0 1.0/ 1.5 3 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
-------- --------- --------- --------- ------- --------
12/05 PM 6.9/ 7.4 1.7/ 2.2 0.9/ 1.4 6-8 None
13/06 AM 5.9/ 6.4 0.7/ 1.1 1.2/ 1.7 10-11 None
13/06 PM 6.7/ 7.2 1.5/ 2.0 1.0/ 1.5 10-11 None
14/07 AM 5.2/ 5.7 0.1/ 0.6 0.8/ 1.3 8-9 None
14/07 PM 6.2/ 6.7 1.0/ 1.5 0.8/ 1.3 6-7 None
15/08 AM 5.4/ 5.9 0.2/ 0.7 0.8/ 1.3 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
-------- --------- --------- --------- ------- --------
12/05 PM 5.7/ 6.2 1.3/ 1.8 0.9/ 1.4 5-7 None
13/06 AM 4.9/ 5.4 0.4/ 0.9 1.1/ 1.6 9 None
13/06 PM 5.7/ 6.2 1.3/ 1.8 1.0/ 1.5 9 None
14/07 AM 4.5/ 5.0 0.0/ 0.5 0.8/ 1.3 7 None
14/07 PM 5.2/ 5.7 0.8/ 1.3 0.7/ 1.1 6 None
15/08 AM 4.6/ 5.1 0.1/ 0.6 0.8/ 1.3 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
-------- --------- --------- --------- ------- --------
12/04 PM 11.8/12.3 1.7/ 2.2 1.1/ 1.6 4-6 None
13/05 AM 10.7/11.2 0.6/ 1.1 1.6/ 2.0 9-10 None
13/05 PM 11.9/12.4 1.8/ 2.2 1.7/ 2.2 10 None
14/06 AM 10.2/10.7 0.1/ 0.6 1.4/ 1.9 8-9 None
14/06 PM 11.1/11.6 1.0/ 1.5 1.3/ 1.8 6-7 None
15/07 AM 10.0/10.5 -0.2/ 0.3 1.3/ 1.8 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
-------- --------- --------- --------- ------- --------
12/04 PM 12.7/13.2 2.2/ 2.7 1.2/ 1.7 3-5 None
13/05 AM 11.4/11.9 0.9/ 1.4 1.7/ 2.2 6-7 None
13/05 PM 12.7/13.2 2.2/ 2.7 1.7/ 2.2 6 None
14/06 AM 10.9/11.4 0.4/ 0.9 1.5/ 2.0 5-6 None
14/06 PM 11.9/12.4 1.4/ 1.9 1.4/ 1.9 4 None
15/07 AM 10.6/11.1 0.1/ 0.6 1.3/ 1.8 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
-------- --------- --------- --------- ------- --------
12/04 PM 11.0/11.5 0.7/ 1.1 1.5/ 2.0 3-4 None
13/05 AM 10.0/10.5 -0.3/ 0.2 2.1/ 2.6 5 None
13/05 PM 11.2/11.7 0.9/ 1.4 2.1/ 2.6 5 None
14/06 AM 9.2/ 9.7 -1.1/-0.7 1.6/ 2.0 4-5 None
14/06 PM 10.1/10.6 -0.2/ 0.2 1.4/ 1.9 4 None
15/07 AM 8.9/ 9.4 -1.5/-1.0 1.3/ 1.8 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
-------- --------- --------- --------- ------- --------
12/01 PM 5.2/ 5.7 0.8/ 1.3 0.7/ 1.1 3 None
13/02 AM 5.0/ 5.5 0.6/ 1.1 1.4/ 1.9 4 None
13/02 PM 5.4/ 5.9 1.0/ 1.5 1.2/ 1.7 4 None
14/03 AM 4.4/ 4.9 0.0/ 0.5 0.8/ 1.3 3-4 None
14/03 PM 4.5/ 5.0 0.1/ 0.6 0.5/ 1.0 3 None
15/04 AM 4.5/ 5.0 0.1/ 0.6 0.9/ 1.4 2 None
&&
$$