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Tropical Storm Henri Advisory Number 19
NWS National Hurricane Center Miami FL AL082021
1100 AM EDT Fri Aug 20 2021
...AIR FORCE HURRICANE HUNTERS FIND HENRI STEADY IN STRENGTH...
...STORM SURGE AND HURRICANE WATCHES ARE IN EFFECT FOR PORTIONS OF
THE NORTHEASTERN UNITED STATES...
SUMMARY OF 1100 AM EDT...1500 UTC...INFORMATION
ABOUT 345 MI...560 KM SSE OF CAPE HATTERAS NORTH CAROLINA
ABOUT 745 MI...1200 KM S OF MONTAUK POINT NEW YORK
MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H
PRESENT MOVEMENT...NW OR 305 DEGREES AT 7 MPH...11 KM/H
MINIMUM CENTRAL PRESSURE...996 MB...29.42 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
The Storm Surge Watch has been extended slightly westward to
Flushing, New York, including adjacent areas of western Long Island
Sound and the East River.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Watch is in effect for...
* South Shore of Long Island from East Rockaway Inlet to Montauk
* North Shore of Long Island from Kings Point to Montauk
* Flushing New York to Sagamore Beach Massachusetts
* Nantucket, Martha's Vineyard, and Block Island
A Hurricane Watch is in effect for...
* South Shore of Long Island from Fire Island Inlet to Montauk
* North Shore of Long Island from Port Jefferson Harbor to Montauk
* New Haven Connecticut to Sagamore Beach Massachusetts
* Nantucket, Martha's Vineyard, and Block Island
A Tropical Storm Watch is in effect for...
* West of Fire Island Inlet to East Rockaway Inlet New York
* West of Port Jefferson Harbor New York
* West of New Haven Connecticut
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
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
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 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 1100 AM EDT (1500 UTC), the center of Tropical Storm Henri was
located near latitude 30.4 North, longitude 73.7 West. Henri is
moving toward the 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 southern New England by late Sunday.
Maximum sustained winds are near 65 mph (100 km/h) with higher
gusts. Strengthening is forecast during the next couple of days,
and Henri is expected to become a hurricane by Saturday and be at
or near hurricane strength when it makes landfall in southern New
Tropical-storm-force winds extend outward up to 90 miles (150 km)
from the center.
The estimated minimum central pressure based on data from the Air
Force Hurricane Hunters is 996 mb (29.42 inches).
HAZARDS AFFECTING LAND
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 Sagamore Beach, MA including Narragansett Bay,
Buzzards Bay, Vineyard Sound, Nantucket Sound, and Cape Cod
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
WIND: Hurricane conditions are possible within the hurricane watch
area on Sunday, with tropical storm conditions possible by early
Sunday. Tropical storm conditions are possible within the tropical
storm watch area on Sunday.
RAINFALL: Henri may produce rainfall amounts of 2 to 5 inches over
eastern Long Island and southern New England Sunday into Monday,
with isolated maximum totals near 8 inches. Heavy rainfall from
Henri will result in flash, urban, and small stream flooding, along
with the potential for widespread minor and isolated moderate river
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
into the weekend. These swells could cause life-threatening surf
and rip current conditions. Please consult products from your local
Next intermediate advisory at 200 PM EDT.
Next complete advisory at 500 PM EDT.