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Severe · Coastal Flood WarningActive alert

Coastal Flood Warning issued September 27 at 3:19AM EDT until September 27

Affecting Eastern Essex; Suffolk; Eastern Norfolk; Eastern Plymouth; Barnstable; Dukes; Nantucket

In effect until: Sep 27, 2026, 8:30 PM

Eastern Essex; Suffolk; Eastern Norfolk; Eastern Plymouth; Barnstable; Dukes; Nantucket

Likely impact; effects through 8:30 PM.

Take the necessary actions to protect flood-prone property. If travel is required, do not drive around barricades or through water of unknown depth. Inexperienced swimmers should remain out of the water due to dangerous surf conditions.

Read the original bulletin (official text)
* WHAT...For the Coastal Flood Warning, up to one foot of
inundation above ground level in low-lying areas near
shorelines and tidal waterways (3.9 to 12.6 feet Mean Lower
Low Water). For the High Surf Advisory, large breaking waves
of 6 to 15 feet in the surf zone.

* WHERE...Eastern Essex MA, Suffolk MA, Eastern Norfolk MA,
Eastern Plymouth MA, Barnstable MA, Dukes MA and Nantucket MA
Counties.

* WHEN...Until 8 PM EDT Sunday.

* IMPACTS...Strong northeast winds with large waves will result
in minor coastal flooding with pockets of moderate coastal
flooding over multiple high tide cycles from late today
through the weekend. The water also may struggle to vacate the
area after the high tides given persistent strong northeast
winds. The greatest risk for coastal flooding appears to be
setting up south of Boston and onto the Cape and Islands. In
addition...the long duration of northeast winds coupled with
large waves over multiple high tide cycles will result in
areas of severe beach erosion for a prolonged period.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™