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Tropical Storm Henri Storm Surge Watch/Warning Map
2021-08-20 16:47:40| National Hurricane Center (Atlantic)
Storm Surge Watch/Warning Map last updated Fri, 20 Aug 2021 14:47:40 GMT
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Tropical Storm Henri Graphics
2021-08-20 16:46:37| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Fri, 20 Aug 2021 14:46:37 GMT Wind Speed Probabilities last updated Fri, 20 Aug 2021 15:28:51 GMT
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Tropical Storm Henri Forecast Discussion Number 19
2021-08-20 16:45:38| National Hurricane Center (Atlantic)
Issued at 1100 AM EDT Fri Aug 20 2021 000 WTNT43 KNHC 201445 TCDAT3 Tropical Storm Henri Discussion Number 19 NWS National Hurricane Center Miami FL AL082021 1100 AM EDT Fri Aug 20 2021 The Air Force Reserve Hurricane Hunters investigated Henri this morning and based on the flight-level, SFMR, and dropsonde data, the initial intensity is still around 55 kt. The minimum pressure has also been relatively steady. The low-level center of Henri is located close to the northwestern edge of the main area of deep convection, and the vortex is still not vertically aligned due to 20-25 kt of northerly vertical wind shear. Although the intensity of Henri has not changed much during the past couple of days, satellite images show an improving cloud pattern with well- established outflow in the eastern semicircle, which could indicate that Henri is poised to strengthen. There is some uncertainty in the exact position of Henri given the recent aircraft fixes and the tilt of the vortex, but the initial motion appears to be northwestward at 6 kt. A trough over the central Appalachians is expected to cut off tonight, and the combination of that feature and a building ridge to the east/northeast of Henri should cause the storm to turn northward tonight and accelerate in that direction on Saturday. Some of the models show a slight bend to the west around the time Henri is forecast to make landfall on Sunday, and there remains a fair amount spread in the guidance in where the center of Henri will come ashore. The latest GFS and ECMWF ensemble members span a region from near New York City to Cape Cod for the landfall point. Based on the latest consensus aids and initial position, the official track forecast is nudged to the west of the previous one and shows landfall occurring by late Sunday. After day 3, Henri is forecast to eject northeastward across the Gulf of Maine. The ongoing northerly shear is expected to decrease later today, and the global models show a favorable upper-level wind pattern developing over the storm later today through the weekend. These more conducive atmospheric conditions combined with the warm Gulf Stream waters should allow Henri to strengthen to a hurricane tonight or early Saturday with additional intensification expected into Saturday night. By early Sunday, however, Henri is forecast to cross the north wall of the Gulf Stream, and that should end its opportunity for strengthening. Although steady to rapid weakening is forecast while Henri moves over cooler waters south of New England, it will likely still be at or very near hurricane intensity when it reaches the coast. Post-tropical transition is forecast to occur in 3 to 4 days, and the new forecast shows Henri dissipated by day 5, in agreement with most of the global models. Users are reminded to not focus on the exact forecast of the center of Henri since impacts will extend far from the center. Key Messages: 1. Dangerous storm surge inundation and hurricane conditions are possible beginning Sunday in portions of Long Island, Connecticut, Rhode Island, and southeastern Massachusetts, where a Storm Surge Watch and Hurricane Watch are in effect. Residents in these areas should follow any advice given by local officials. 2. Heavy rainfall may lead to flash, urban, and small stream flooding, along with the potential for widespread minor and isolated moderate river flooding, over portions of southern New England Sunday into Monday. 3. Swells from Henri will begin to reach much of the east coast of the U.S. and Atlantic Canada by the end of the week and continue through the weekend. These swells could cause life-threatening surf and rip currents. FORECAST POSITIONS AND MAX WINDS INIT 20/1500Z 30.4N 73.7W 55 KT 65 MPH 12H 21/0000Z 31.5N 73.7W 60 KT 70 MPH 24H 21/1200Z 34.1N 72.7W 70 KT 80 MPH 36H 22/0000Z 37.3N 71.8W 75 KT 85 MPH 48H 22/1200Z 39.8N 71.7W 65 KT 75 MPH 60H 23/0000Z 41.4N 71.8W 60 KT 70 MPH...INLAND 72H 23/1200Z 42.4N 71.8W 40 KT 45 MPH...INLAND 96H 24/1200Z 43.7N 69.4W 35 KT 40 MPH...POST-TROPICAL 120H 25/1200Z...DISSIPATED $$ Forecaster Cangialosi
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Summary for Tropical Storm Henri (AT3/AL082021)
2021-08-20 16:44:35| National Hurricane Center (Atlantic)
...AIR FORCE HURRICANE HUNTERS FIND HENRI STEADY IN STRENGTH... ...STORM SURGE AND HURRICANE WATCHES ARE IN EFFECT FOR PORTIONS OF THE NORTHEASTERN UNITED STATES... As of 11:00 AM EDT Fri Aug 20 the center of Henri was located near 30.4, -73.7 with movement NW at 7 mph. The minimum central pressure was 996 mb with maximum sustained winds of about 65 mph.
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Tropical Storm Henri Public Advisory Number 19
2021-08-20 16:44:35| National Hurricane Center (Atlantic)
Issued at 1100 AM EDT Fri Aug 20 2021 000 WTNT33 KNHC 201444 TCPAT3 BULLETIN 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 ----------------------------------------------- LOCATION...30.4N 73.7W 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 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 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 England. 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 Bay...3-5 ft 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 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 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 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 intermediate advisory at 200 PM EDT. Next complete advisory at 500 PM EDT. $$ Forecaster Cangialosi
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