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BULLETIN
Tropical Storm Henri Intermediate Advisory Number 22A
NWS National Hurricane Center Miami FL       AL082021
800 AM EDT Sat Aug 21 2021
 
...AIR FORCE AND NOAA HURRICANE HUNTERS INVESTIGATING HENRI...
...A DANGEROUS STORM SURGE, HURRICANE CONDITIONS, AND FLOODING 
RAINFALL EXPECTED IN PORTIONS OF THE NORTHEAST UNITED STATES 
BEGINNING LATE TONIGHT OR EARLY SUNDAY...
 
 
SUMMARY OF 800 AM EDT...1200 UTC...INFORMATION
----------------------------------------------
LOCATION...33.6N 72.7W
ABOUT 200 MI...320 KM SE OF CAPE HATTERAS NORTH CAROLINA
ABOUT 525 MI...850 KM S OF MONTAUK POINT NEW YORK
MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H
PRESENT MOVEMENT...NNE OR 15 DEGREES AT 12 MPH...19 KM/H
MINIMUM CENTRAL PRESSURE...993 MB...29.32 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 Westport Massachusetts
* 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. should monitor the
progress of Henri.
 
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 800 AM EDT (1200 UTC), the center of Tropical Storm Henri was
located near latitude 33.6 North, longitude 72.7 West. Henri is
moving toward the north-northeast near 12 mph (19 km/h). A northward
to north-northeastward motion is expected today, with a turn toward
the north-northwest expected by tonight.  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 through tonight, and Henri is 
expected to become a hurricane later 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 estimated minimum central pressure based on data from the Air 
Force and NOAA Hurricane Hunters is 993 mb (29.32 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 expected 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 portions of Long Island, New England, southeast New
York, and northern New Jersey 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.
 
TORNADOES:  A tornado or two may occur Sunday over southern New
England.
 
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 1100 AM EDT.
 
$$
Forecaster Cangialosi
 
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