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BULLETIN
Tropical Storm Henri Intermediate Advisory Number 18A
NWS National Hurricane Center Miami FL       AL082021
800 AM EDT Fri Aug 20 2021
 
...AIR FORCE HURRICANE HUNTERS CURRENTLY INVESTIGATING HENRI...
...STORM SURGE AND HURRICANE WATCHES ARE IN EFFECT FOR PORTIONS OF 
THE NORTHEASTERN UNITED STATES...
 
 
SUMMARY OF 800 AM EDT...1200 UTC...INFORMATION
----------------------------------------------
LOCATION...30.0N 73.7W
ABOUT 375 MI...600 KM SSE OF CAPE HATTERAS NORTH CAROLINA
ABOUT 800 MI...1290 KM SSW OF NANTUCKET MASSACHUSETTS
MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H
PRESENT MOVEMENT...WNW OR 300 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...995 MB...29.39 INCHES
 
 
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
 
None.
 
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
* Kings Point 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
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 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 800 AM EDT (1200 UTC), the center of Tropical Storm Henri was
located near latitude 30.0 North, longitude 73.7 West.  Henri is
moving toward the west-northwest near 9 mph (15 km/h).  A turn
toward the northwest is forecast later today, followed by a turn
toward the north tonight.  Henri is forecast to accelerate toward
the north through early next week and approach the coast of southern
New England on Sunday.
 
Maximum sustained winds are near 65 mph (100 km/h) with higher
gusts.  Strengthening is forecast during the next few days, and
Henri is expected to become a hurricane by Saturday.
 
Tropical-storm-force winds extend outward up to 90 miles (150 km)
from the center.
 
The estimated minimum central pressure is 995 mb (29.39 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
Bay....3-5 ft
East Rockaway Inlet, NY to Montauk Point, NY...2-4 ft
North shore of Long Island...2-4 ft
Kings Point, 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 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
southern New England Sunday into Monday, with isolated maximum
totals near 8 inches. Heavy rainfall from Henri may result in areas
of flash, urban, and small stream 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
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 complete advisory at 1100 AM EDT.
 
$$
Forecaster Cangialosi
 
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