Special Weather Statement - 5/15/18 at 9:06 p.m.

Abnormal ocean surges expected tonight...

From the National Weather Service:





Special Weather Statement
National Weather Service Boston/Norton MA
906 PM EDT Tue May 15 2018

Southern Bristol MA-Barnstable MA-Dukes MA-Nantucket MA-
Washington RI-Newport RI-Block Island RI-
Including the cities of Fall River, New Bedford, Chatham,
Falmouth, Provincetown, Vineyard Haven, Nantucket, Narragansett,
Westerly, Newport, and New Shoreham
906 PM EDT Tue May 15 2018


Air pressure sensor and tide gage readings near Block Canyon off
the Mid Atlantic coast indicated that a weather-generated abnormal
rise is water levels was triggered by a storm system as it moved
over the ocean. Water level fluctuations of several inches to one
foot above normal tide in localized areas can be expected at the
shore for the next several hours as a series of surges strike the
coast. While No coastal flooding is expected, the strong currents
associated with these surges could pose danger to those in or
near the water. Recommended actions are listed below.

Impacts are expected along the ocean-exposed south coast of
Massachusetts and Rhode Island.

Boat owners...
* Prepare now for the following hazards...
  * Strong, unpredictable currents.
  * Surging up to one foot above normal sea level.

Swimmers, surfers and boaters...
* It is recommended you leave the beach now to avoid the following
  * Strong currents.
  * Potentially dangerous surges of water.

This kind of tsunami is generated by abrupt changes of
atmospheric pressure in the causative storm system, which is a
line of thunderstorms that moved over the ocean in this case. The
combination of the air pressure effect on the ocean surface, and
the speed at which the pressure disturbance travels, can generate
abnormal waves in certain situations. The National Tsunami Warning
Center is monitoring this event.

Additional statements will be issued if necessary through
National Weather Service Office Forecast Office in Norton, MA.

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