000 WTNT33 KNHC 212354 TCPAT3  BULLETIN Hurricane Henri Intermediate Advisory Number 24A NWS National Hurricane Center Miami FL       AL082021 800 PM EDT Sat Aug 21 2021  ...HENRI MOVING QUICKLY TO THE NORTH-NORTHEAST... ...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 PM EDT...0000 UTC...INFORMATION ---------------------------------------------- LOCATION...37.4N 71.0W ABOUT 255 MI...410 KM S OF MONTAUK POINT NEW YORK ABOUT 290 MI...470 KM ENE OF CAPE HATTERAS NORTH CAROLINA MAXIMUM SUSTAINED WINDS...75 MPH...120 KM/H PRESENT MOVEMENT...NNE OR 20 DEGREES AT 18 MPH...30 KM/H MINIMUM CENTRAL PRESSURE...988 MB...29.18 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 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 * 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, 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.  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 PM EDT (0000 UTC), the center of Hurricane Henri was located near latitude 37.4 North, longitude 71.0 West. Henri is moving toward the north-northeast near 18 mph (30 km/h) and this motion is expected to continue through tonight.  A decrease in forward speed and a turn toward the north-northwest is expected on Sunday.  On the forecast track, Henri is expected to make landfall on Long Island or in southern New England on Sunday.  Maximum sustained winds are near 75 mph (120 km/h) with higher gusts.  Strengthening is forecast through tonight.  Although some weakening is expected prior to landfall on Sunday, Henri is forecast to be at or near hurricane strength when it reaches the coasts of Long Island and southern New England.  Hurricane-force winds extend outward up to 45 miles (75 km) from the center and tropical-storm-force winds extend outward up to 150 miles (240 km).  The minimum central pressure reported by a NOAA Hurricane Hunter  aircraft data is 988 mb (29.18 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 www.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 Sagamore Beach, MA to Merrimack River including Massachusetts Bay...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.  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 minor and 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 PM EDT.  $$ Forecaster Beven