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BULLETIN
Tropical Storm Henri Advisory Number  20
NWS National Hurricane Center Miami FL       AL082021
500 PM EDT Fri Aug 20 2021
 
...HENRI ALMOST A HURRICANE...
...HURRICANE AND STORM SURGE WARNINGS ISSUED FOR PORTIONS OF LONG
ISLAND AND SOUTHERN NEW ENGLAND...
 
 
SUMMARY OF 500 PM EDT...2100 UTC...INFORMATION
----------------------------------------------
LOCATION...31.2N 73.9W
ABOUT 290 MI...470 KM SSE OF CAPE HATTERAS NORTH CAROLINA
ABOUT 695 MI...1115 KM S OF MONTAUK POINT NEW YORK
MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H
PRESENT MOVEMENT...NNW OR 340 DEGREES AT 7 MPH...11 KM/H
MINIMUM CENTRAL PRESSURE...994 MB...29.36 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
A Storm Surge Warning is in effect for the south shore of Long
Island from Mastic Beach to Montauk Point, the north shore of
Long Island from Oyster Bay to Montauk Point, from Greenwich,
Connecticut to Chatham, Massachusetts, including Nantucket,
Martha's Vineyard, and Block Island.
 
A Hurricane Warning is in effect for the south shore of Long Island
from Fire Island Inlet to Montauk Point, for the north shore of Long
Island from Port Jefferson Harbor to Montauk Point, and from New
Haven, Connecticut, to west of Watch Hill, Rhode Island.
 
A Tropical Storm Warning is in effect from west of Port Jefferson
Harbor to west of New Haven, Connecticut, and for the south shore
of Long Island from west of Fire Island Inlet to East Rockaway
Inlet.
 
A Tropical Storm Watch in effect from Manasquan Inlet, New Jersey,
to west of East Rockaway Inlet, New York, including New York City.
 
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
 
A Storm Surge Warning is in effect for...
* South shore of Long Island from Mastic Beach to Montauk Point
* North shore of Long Island from Oyster Bay to Montauk Point
* Greenwich Connecticut to Chatham Massachusetts
* Nantucket, Martha's Vineyard, and Block Island
 
A Storm Surge Watch is in effect for...
* South shore of Long Island from west of Mastic Beach to East
Rockaway Inlet
* North shore of Long Island from west of Oyster Bay to Flushing
* Flushing New York to west of Greenwich Connecticut
* North of Chatham Massachusetts to Sagamore Beach Massachusetts
* Cape Cod Bay
 
A Hurricane Warning is in effect for...
* South shore of Long Island from Fire Island Inlet to Montauk Point
* North shore of Long Island from Port Jefferson Harbor to Montauk
Point
* New Haven Connecticut to west of Watch Hill Rhode Island
 
A Hurricane Watch is in effect for...
* Watch Hill Rhode Island to Sagamore Beach Massachusetts
* Nantucket, Martha's Vineyard, and Block Island
 
A Tropical Storm Warning is in effect for...
* Port Jefferson Harbor to west of New Haven Connecticut
* South shore of Long Island from west of Fire Island Inlet to East
Rockaway Inlet
 
A Tropical Storm Watch is in effect for...
* Manasquan Inlet New Jersey to west of East Rockaway Inlet New
York, including New York City
 
A Storm Surge Warning means there is a danger of life-threatening
inundation, from rising water moving inland from the coastline,
during the next 36 hours in the indicated locations. For a
depiction of areas at risk, please see the National Weather
Service Storm Surge Watch/Warning Graphic, available at
hurricanes.gov.  This is a life-threatening situation.  Persons
located within these areas should take all necessary actions to
protect life and property from rising water and the potential for
other dangerous conditions.  Promptly follow evacuation and other
instructions from local officials.
 
A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area.  A warning is typically issued
36 hours before the anticipated first occurrence of tropical-storm-
force winds, conditions that make outside preparations difficult or
dangerous.  Preparations to protect life and property should be
rushed to completion.
 
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area within 36 hours.
 
A Storm Surge Watch means there is a possibility of life-
threatening inundation, from rising water moving inland from the
coastline, in the indicated locations during the next 48 hours.
For a depiction of areas at risk, please see the National Weather
Service Storm Surge Watch/Warning Graphic, available at
hurricanes.gov.
 
A Hurricane Watch means that hurricane conditions are possible
within the watch area.  A watch is typically issued 48 hours
before the anticipated first occurrence of tropical-storm-force
winds, conditions that make outside preparations difficult or
dangerous.
 
A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area, generally within 48 hours.
 
Interests elsewhere in the northeastern U.S. and Atlantic Canada
should monitor the progress of Henri.  Additional watches or
warnings will likely be required later tonight or Saturday.
 
For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
local National Weather Service forecast office.
 
 
DISCUSSION AND OUTLOOK
----------------------
At 500 PM EDT (2100 UTC), the center of Tropical Storm Henri was
located near latitude 31.2 North, longitude 73.9 West. Henri is
moving toward the north-northwest near 7 mph (11 km/h).  A turn
toward the north is expected by tonight, and Henri is forecast to
accelerate in that direction through early Sunday.  On the forecast
track, Henri is expected to make landfall in Long Island or 
southern New England on Sunday.
 
Maximum sustained winds are near 70 mph (110 km/h) with higher
gusts.  Strengthening is forecast during the next day or so, 
and Henri is expected to become a hurricane tonight or Saturday and 
be at or near hurricane strength when it makes landfall in Long 
Island or southern New England.
 
Tropical-storm-force winds extend outward up to 115 miles (185 km)
from the center.
 
The estimated minimum central pressure is 994 mb (29.36 inches).
 
 
HAZARDS AFFECTING LAND
----------------------
Key messages for Henri can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT3, WMO header WTNT43 KNHC
and on the web at hurricanes.gov/graphics_at3.shtml?key_messages.
 
STORM SURGE:  The combination of a dangerous storm surge and the
tide will cause normally dry areas near the coast to be flooded by
rising waters moving inland from the shoreline.  The water could
reach the following heights above ground somewhere in the indicated
areas if the peak surge occurs at the time of high tide...
 
Watch Hill, RI to Chatham, MA including Narragansett Bay,
Buzzards Bay, Vineyard Sound, and Nantucket Sound...3-5 ft
Chatham, MA to Sagamore Beach, MA including Cape Cod Bay...2-4 ft
East Rockaway Inlet, NY to Montauk Point, NY...2-4 ft
North shore of Long Island...2-4 ft
Flushing, NY to Watch Hill, RI...2-4 ft
Cape May, NJ to East Rockaway Inlet, NY...1-3 ft
 
The deepest water will occur along the immediate coast in areas of
onshore winds, where the surge will be accompanied by large and
dangerous waves.  Surge-related flooding depends on the relative
timing of the surge and the tidal cycle, and can vary greatly over
short distances.  For information specific to your area, please see
products issued by your local National Weather Service forecast
office.
 
WIND:  Hurricane conditions are expected in the hurricane warning 
area on Sunday, with tropical storm conditions expected by early 
Sunday.  Hurricane conditions are possible in the hurricane watch 
area on Sunday, with tropical conditions possible by early Sunday. 
Tropical storm conditions are expected in the tropical storm warning 
area and possible in the tropical storm watch area on Sunday.
 
RAINFALL:  Henri may produce rainfall amounts of 3 to 6 inches over 
Long Island and New England Sunday into Monday, with isolated 
maximum totals near 10 inches. Heavy rainfall from Henri could 
result in considerable flash, urban, and small stream flooding, 
along with the potential for widespread minor and isolated moderate 
river flooding.

SURF:  Swells generated by Henri should continue to affect Bermuda
during the next day or so.  Swells are expected to increase across
much of the east coast of the U.S. and Atlantic Canada tonight and
into the weekend.  These swells could cause life-threatening surf
and rip current conditions.  Please consult products from your local
weather office.

 
NEXT ADVISORY
-------------
Next intermediate advisory at 800 PM EDT.
Next complete advisory at 1100 PM EDT.
 
$$
Forecaster Cangialosi
 
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