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Hurricane Henri Intermediate Advisory Number 25A
NWS National Hurricane Center Miami FL AL082021
200 AM EDT Sun Aug 22 2021
...HENRI HEADING TOWARD SOUTHERN NEW ENGLAND AND LONG ISLAND...
...A DANGEROUS STORM SURGE, HURRICANE CONDITIONS, AND FLOODING
RAINFALL ARE EXPECTED IN PORTIONS OF THE NORTHEAST UNITED STATES
BEGINNING THIS MORNING...
SUMMARY OF 200 AM EDT...0600 UTC...INFORMATION
ABOUT 135 MI...215 KM SSE OF MONTAUK POINT NEW YORK
ABOUT 175 MI...280 KM S OF PROVIDENCE RHODE ISLAND
MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H
PRESENT MOVEMENT...N OR 355 DEGREES AT 21 MPH...33 KM/H
MINIMUM CENTRAL PRESSURE...987 MB...29.15 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
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
* 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
* New Haven Connecticut to west of 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
* Westport Massachusetts to Chatham Massachusetts, including
Martha's Vineyard and Nantucket
* 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. 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, in this case beginning within
the next 12 hours.
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area.
A Storm Surge Watch means there is a possibility of life-
threatening inundation, from rising water moving inland from the
coastline, in this case beginning within the next 12 hours.
For a depiction of areas at risk, please see the National Weather
Service Storm Surge Watch/Warning Graphic, available at
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 200 AM EDT (0600 UTC), the center of Hurricane Henri was located
near latitude 39.3 North, longitude 71.0 West. Henri is moving
toward the north near 21 mph (33 km/h). A decrease in forward
speed and a turn toward the north-northwest is expected later this
morning. On the forecast track, Henri is expected to make landfall
in southern New England or on Long Island today. After landfall, a
turn to the north and a slower forward speed are expected as Henri
moves over southern New England.
Reports from Air Force Reserve Hurricane Hunter aircraft indicate
that maximum sustained winds are near 75 mph (120 km/h) with higher
gusts. Slight strengthening is possible early this morning.
Weakening is expected to begin later today. However, Henri is
expected to be at or near hurricane strength when it reaches the
coasts of southern New England and Long island. Rapid weakening is
expected after Henri makes landfall.
Hurricane-force winds extend outward up to 35 miles (55 km) from
the center and tropical-storm-force winds extend outward up to 150
miles (240 km).
The latest minimum central pressure estimated from data from
an Air Force Reserve Hurricane Hunter aircraft is 987 mb (29.15
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
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,
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,
Cape May, NJ to East Rockaway Inlet, NY...1-3 ft
Sagamore Beach, MA to Merrimack River including Massachusetts
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
WIND: Hurricane conditions are expected in the hurricane warning
area today, with tropical storm conditions beginning within the
next few hours. Tropical storm conditions are expected in the
tropical storm warning area beginning this morning and continuing
RAINFALL: Henri is expected to produce rainfall amounts of 3 to 6
inches over portions of Long Island, New England, southeast New
York, and New Jersey today 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 to isolated moderate river flooding.
TORNADOES: A tornado or two may occur today over southern
SURF: Swells generated by Henri should continue to affect Bermuda
today. Swells are expected to increase across much of the east
coast of the U.S. and Atlantic Canada today and continue into
Monday. These swells could cause life-threatening surf and rip
current conditions. Please consult products from your local
Next complete advisory at 500 AM EDT.