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BULLETIN
Tropical Storm Henri Intermediate Advisory Number 21A
NWS National Hurricane Center Miami FL       AL082021
200 AM EDT Sat Aug 21 2021
 
...HENRI EXPECTED TO STRENGTHEN INTO A HURRICANE TODAY...

 
SUMMARY OF 200 AM EDT...0600 UTC...INFORMATION
----------------------------------------------
LOCATION...32.4N 73.4W
ABOUT 230 MI...370 KM SSE OF CAPE HATTERAS NORTH CAROLINA
ABOUT 605 MI...975 KM S OF MONTAUK POINT NEW YORK
MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H
PRESENT MOVEMENT...N OR 10 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...996 MB...29.41 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
None
 
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 New
York
* North shore of Long Island from Montauk Point to Flushing New York
* Flushing New York to Chatham Massachusetts
* Nantucket, Martha's Vineyard, and Block Island
 
A Storm Surge Watch is in effect for...
* East Rockaway Inlet to Mastic New York
* 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
* Watch Hill Rhode Island to Woods Hole Massachusetts including
Block Island and Martha's Vineyard.
* Coastal New York and New Jersey west of East Rockaway Inlet to
Manasquan Inlet, 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.
 
Interests elsewhere in the northeastern U.S. and Atlantic Canada
should monitor the progress of Henri.  Additional watches or
warnings may be required later today.
 
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 200 AM EDT (0600 UTC), the center of Tropical Storm Henri was
located near latitude 32.4 North, longitude 73.4 West. Henri is
moving toward the north near 9 mph (15 km/h).  A northward to
north-northeastward motion is expected today, with a turn toward 
the north-northwest expected late today or tonight.  On the 
forecast track, Henri is expected to make landfall in Long
Island or southern New England late Saturday night or on Sunday.
 
Maximum sustained winds remain near 70 mph (110 km/h) with 
higher gusts.  Strengthening is forecast during the next 24 
hours, and Henri is expected to become a hurricane today 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 minimum central pressure estimated from Air Force Reserve 
Hurricane Hunter aircraft data is 996 mb (29.41 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...
 
Flushing, NY to Chatham, MA including Narragansett Bay, Buzzards
Bay, Vineyard Sound, and Nantucket Sound...3-5 ft
North shore of Long Island from Flushing to Montauk Point, NY
including Long Island Sound...3-5 ft
South shore of Long Island from Mastic Beach to Montauk Point,
NY...3-5 ft
Chatham, MA to Sagamore Beach, MA including Cape Cod Bay...2-4 ft
South shore of Long Island from East Rockaway Inlet to Mastic Beach,
NY...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 late tonight or on Sunday, with tropical storm conditions 
expected by tonight.  Hurricane conditions are possible in the 
hurricane watch area late tonight or on Sunday, with tropical 
conditions possible by late tonight. Tropical storm conditions are 
expected in the tropical storm warning area late tonight and Sunday.
 
RAINFALL:  Henri is expected to 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
may 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 today 
and Sunday.  These swells could cause life-threatening surf and rip 
current conditions.  Please consult products from your local 
weather office.
 
 
NEXT ADVISORY
-------------
Next complete advisory at 500 AM EDT.
 
$$
Forecaster Brown
 
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