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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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