[Tropical] Hurricane Local Statement

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Tropical Storm Henri Local Statement Advisory Number 21
National Weather Service Boston/Norton MA  AL082021
1123 PM EDT Fri Aug 20 2021

This product covers Southern New England

**HENRI IS FORECAST TO IMPACT SOUTHERN NEW ENGLAND SUNDAY AND
MONDAY**

NEW INFORMATION
---------------

* CHANGES TO WATCHES AND WARNINGS:
    - A Tropical Storm Warning has been issued for Block Island RI,
      Bristol RI, Dukes MA, Eastern Kent RI, Newport RI, Southern
      Bristol MA, Southern Plymouth MA, Washington RI, and Western
      Kent RI

* CURRENT WATCHES AND WARNINGS:
    - A Tropical Storm Warning and Hurricane Watch are in effect for
      Western Kent RI
    - A Storm Surge Warning and Hurricane Watch are in effect for
      Barnstable MA and Nantucket MA
    - A Storm Surge Warning, Tropical Storm Warning, and Hurricane
      Watch are in effect for Block Island RI, Bristol RI, Dukes MA,
      Eastern Kent RI, Newport RI, Southern Bristol MA, Southern
      Plymouth MA, and Washington RI

* STORM INFORMATION:
    - About 650 miles south-southwest of Nantucket MA
    - 32.3N 73.5W
    - Storm Intensity 70 mph
    - Movement North or 10 degrees at 9 mph

SITUATION OVERVIEW
------------------

Tropical Storm Henri is forecast to strengthen to a hurricane as it
heads northward overnight and Saturday. Henri is expected to make
landfall near Long Island Sunday, then should weaken rapidly as it
heads into Connecticut Sunday evening and slowly exits the region
Monday. There remains uncertainty in how far west Henri will track and
how strong it will get before making landfall. The main hazards include
damaging winds, flooding rain, and storm surge flooding.

POTENTIAL IMPACTS
-----------------

* WIND:
Prepare for life-threatening wind having possible extensive impacts
across south coastal Rhode Island and Massachusetts. Potential impacts
in this area include:
    - Considerable roof damage to sturdy buildings, with some having
      window, door, and garage door failures leading to structural
      damage. Mobile homes severely damaged, with some destroyed.
      Damage accentuated by airborne projectiles. Locations may be
      uninhabitable for weeks.
    - Many large trees snapped or uprooted along with fences and
      roadway signs blown over.
    - Some roads impassable from large debris, and more within urban
      or heavily wooded places. Several bridges, causeways, and
      access routes impassable.
    - Large areas with power and communications outages.

Also, prepare for dangerous wind having possible limited to
significant impacts across the rest of southern New England.

* FLOODING RAIN:
Prepare for life-threatening rainfall flooding having possible
extensive impacts across western Massachusetts and much of Connecticut.
Potential impacts include:
    - Major rainfall flooding may prompt many evacuations and rescues.
    - Rivers and tributaries may rapidly overflow their banks in
      multiple places. Small streams, creeks, and ditches may become
      dangerous rivers. In mountain areas, destructive runoff may run
      quickly down valleys while increasing susceptibility to
      rockslides and mudslides. Flood control systems and barriers
      may become stressed.
    - Flood waters can enter many structures within multiple
      communities, some structures becoming uninhabitable or washed
      away. Many places where flood waters may cover escape routes.
      Streets and parking lots become rivers of moving water with
      underpasses submerged. Driving conditions become dangerous.
      Many road and bridge closures with some weakened or washed out.

Prepare for dangerous rainfall flooding having possible limited to
significant impacts across the rest of southern New England.

* SURGE:
Prepare for life-threatening surge having possible significant impacts
across south coastal Rhode Island and Massachusetts. Potential impacts
in this area include:
    - Areas of inundation with storm surge flooding accentuated by
      waves. Damage to several buildings, mainly near the coast.
    - Sections of near-shore escape routes and secondary roads become
      weakened or washed out, especially in usually vulnerable low
      spots.
    - Major beach erosion with heavy surf breaching dunes. Strong and
      numerous rip currents.
    - Moderate damage to marinas, docks, boardwalks, and piers.
      Several small craft broken away from moorings, especially in
      unprotected anchorages.

Also, prepare for locally hazardous surge having possible limited
impacts across east coastal Massachusetts.

PRECAUTIONARY/PREPAREDNESS ACTIONS
----------------------------------

* EVACUATIONS:
Listen to local official for recommended preparedness actions,
including possible evacuation. If ordered to evacuate, do so
immediately.

* OTHER PREPAREDNESS INFORMATION:
Now is the time to check your emergency plan and emergency supplies
kit and take necessary actions to protect your family and secure your
home or business.

When making safety and preparedness decisions, do not focus on the
exact forecast track since hazards such as flooding rain, damaging
wind gusts, storm surge, and tornadoes extend well away from the
center of the storm.

If you are a visitor, know the name of the county in which you are
located and where it is relative to current watches and warnings. If
staying at a hotel, ask the management staff about their onsite
disaster plan. Listen for evacuation orders, especially pertaining to
area visitors.

Closely monitor weather.gov, NOAA Weather Radio and local news
outlets for official storm information. Listen for possible changes
to the forecast.

* ADDITIONAL SOURCES OF INFORMATION:
- For information on appropriate preparations see ready.gov
- For information on creating an emergency plan see getagameplan.org
- For additional disaster preparedness information see redcross.org

NEXT UPDATE
-----------

The next local statement will be issued by the National Weather
Service in Boston/Norton MA around 6 AM EDT Saturday, or sooner if
conditions warrant.

$$

JWD
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