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Elev 19 ft, 41.7 °N, 70.15 °W

South Dennis, MA Severe Weather Alertstar_ratehome

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Current Station
Personal Weather Station
Location: South Dennis, MA
Elevation: 19ft
Nearby Weather Stations

Active Weather Alerts

Wind Advisory
Issued: 6:25 PM Oct. 12, 2025 – National Weather Service
...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT MONDAY...

* WHAT...Northeast winds 20 to 30 mph with gusts up to 50 mph
expected.

* WHERE...Barnstable MA County.

* WHEN...Until 8 PM EDT Monday.

* IMPACTS...Gusty winds will blow around unsecured objects. Tree
limbs could be blown down and some power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.

&&

Coastal Flood Advisory
Issued: 6:18 PM Oct. 12, 2025 – National Weather Service
...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

&&

Storm Warning
Issued: 6:00 PM Oct. 12, 2025 – National Weather Service
...STORM WARNING REMAINS IN EFFECT UNTIL 8 AM EDT MONDAY...

* WHAT...Northeast winds 30 to 40 kt with gusts up to 50 kt and
seas 7 to 10 feet expected.

* WHERE...Nantucket Sound.

* WHEN...Until 8 AM EDT Monday.

* IMPACTS...Storm force winds and hazardous seas will capsize or
damage vessels and reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Mariners should remain in port, alter course, and/or secure the
vessel for severe conditions.

&&

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