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Tropical Storm Henri Forecast Advisory Number 18
2021-08-20 10:58:00| National Hurricane Center (Atlantic)
Issued at 0900 UTC FRI AUG 20 2021 875 WTNT23 KNHC 200857 TCMAT3 TROPICAL STORM HENRI FORECAST/ADVISORY NUMBER 18 NWS NATIONAL HURRICANE CENTER MIAMI FL AL082021 0900 UTC FRI AUG 20 2021 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... A STORM SURGE WATCH HAS BEEN ISSUED FOR THE SOUTH SHORE OF LONG ISLAND FROM EAST ROCKAWAY INLET EASTWARD TO MONTAUK...THE NORTH SHORE OF LONG ISLAND FROM KINGS POINT EASTWARD TO MONTAUK...AND FROM KINGS POINT EASTWARD TO SAGAMORE BEACH...MASSACHUSETTS... INCLUDING NANTUCKET...MARTHA'S VINEYARD...AND BLOCK ISLAND. A HURRICANE WATCH HAS BEEN ISSUED FOR LONG ISLAND FROM FIRE ISLAND INLET EASTWARD AND FROM PORT JEFFERSON HARBOR EASTWARD. A HURRICANE WATCH HAS ALSO BEEN ISSUED FROM NEW HAVEN...CONNECTICUT... EASTWARD TO SAGAMORE BEACH...MASSACHUSETTS...INCLUDING NANTUCKET... MARTHA'S VINEYARD...AND BLOCK ISLAND. A TROPICAL STORM WATCH HAS BEEN ISSUED WEST OF FIRE ISLAND INLET TO EAST ROCKAWAY INLET...WEST OF PORT JEFFERSON HARBOR...AND WEST OF NEW HAVEN. 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. TROPICAL STORM CENTER LOCATED NEAR 30.2N 73.1W AT 20/0900Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 300 DEGREES AT 8 KT ESTIMATED MINIMUM CENTRAL PRESSURE 995 MB MAX SUSTAINED WINDS 55 KT WITH GUSTS TO 65 KT. 50 KT....... 50NE 40SE 0SW 0NW. 34 KT....... 80NE 60SE 40SW 60NW. 12 FT SEAS..120NE 75SE 75SW 120NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 30.2N 73.1W AT 20/0900Z AT 20/0600Z CENTER WAS LOCATED NEAR 30.0N 72.8W FORECAST VALID 20/1800Z 31.0N 73.5W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 50NE 40SE 0SW 0NW. 34 KT... 90NE 90SE 60SW 50NW. FORECAST VALID 21/0600Z 33.0N 72.9W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 50NE 50SE 20SW 20NW. 34 KT...100NE 110SE 80SW 50NW. FORECAST VALID 21/1800Z 36.1N 71.8W MAX WIND 70 KT...GUSTS 85 KT. 64 KT... 20NE 25SE 0SW 0NW. 50 KT... 50NE 50SE 30SW 20NW. 34 KT...100NE 130SE 100SW 60NW. FORECAST VALID 22/0600Z 39.1N 71.1W MAX WIND 75 KT...GUSTS 90 KT. 64 KT... 20NE 25SE 15SW 0NW. 50 KT... 40NE 50SE 30SW 30NW. 34 KT... 90NE 120SE 80SW 60NW. FORECAST VALID 22/1800Z 41.1N 71.3W MAX WIND 65 KT...GUSTS 80 KT. 50 KT... 30NE 40SE 20SW 20NW. 34 KT... 70NE 80SE 60SW 50NW. FORECAST VALID 23/0600Z 42.2N 71.6W...INLAND MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 20NE 20SE 0SW 0NW. 34 KT... 50NE 50SE 40SW 30NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 24/0600Z 43.5N 70.0W...POST-TROPICAL MAX WIND 35 KT...GUSTS 45 KT. OUTLOOK VALID 25/0600Z 45.3N 63.0W...POST-TROP/EXTRATROP MAX WIND 30 KT...GUSTS 40 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 30.2N 73.1W INTERMEDIATE PUBLIC ADVISORY...WTNT33 KNHC/MIATCPAT3...AT 20/1200Z NEXT ADVISORY AT 20/1500Z $$ FORECASTER BERG
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