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Tropical Storm Henri


wxeyeNH
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1 hour ago, STILL N OF PIKE said:

Off till Monday pm

Heading to Newport, RI

next couple days and maybe Nahant Monday am

Why not block island? Maybe? Many will be cancelling their weekend overnights! However ferry service will stop Sunday and Monday  :)

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1 minute ago, Eskimo Joe said:

Looks like the 00z hurricane guidance shows no more OTS solutions. Man to be a fly on the wall at BOX or OKX right now.

 

00z Euro rolling in with a Martha's Vineyard "landfall", yet in similar fashion to the HWRF a rapidly weakening system.  

69fe2396-3327-46e6-94b3-3dfb707fb914.gif

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Looks like 5 recon flights into Henri tomorrow. 3 low-level and two upper.

3. OUTLOOK FOR SUCCEEDING DAY:
       A. CONTINUE 6-HRLY FIXES ON GRACE WHILE IT REMAINS A THREAT.
       B. BEGIN 6-HRLY FIXES ON HENRI AT 20/2330Z.
       C. TWO MORE NOAA 49 G-IV SYNOPTIC SURVEILLANCE MISSIONS AROUND
          HENRI FOR THE 21/0000Z AND 21/1200Z SYNOPTIC TIMES,
          DEPARTING KLAL AT 20/1730Z AND 21/0530Z.
       D. NOAA P-3 TAIL DOPPLER RADAR MISSIONS INTO HENRI DEPARTING
          KLAL AT 20/2000Z AND 21/0800Z.

https://www.nhc.noaa.gov/text/MIAREPRPD_last.shtml

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15 minutes ago, ineedsnow said:

Eye starting to show?

goes16_ir_08L_202108200722_lat30.0-lon-72.8.jpg

Look at shortwave IR at night to see the low level cloud patterns better. LLC is still at the northern edge of the deepest convection. Starting to get covered up better now however. MLC and LLC don’t look totally vertically stacked yet. 

 

 

081622B3-6152-4E49-84ED-9A6E1DC8CAE4.jpeg

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Just now, CoastalWx said:

If this hooks into LI and NYC most of the area sees very little outside of CT and RI coasts. There is no ET transition and wind field is tight and not expanding.  Kind of yawn solution.

Then why does the 11pm disco say otherwise?

"

Transition to a post-tropical storm is expected to begin 
shortly thereafter which should be sometime in the 96-h to 120-h 
points as deep convection ceases over the storm over cold SSTs

As noted previously, the wind field of Henri is expected to expand, 
especially as it interacts with a mid-latitude trough located to its 
west. Therefore, users are reminded to not focus on the exact 
forecast points as impacts will extend far from the center.
"
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6 minutes ago, yoda said:

Then why does the 11pm disco say otherwise?

"

Transition to a post-tropical storm is expected to begin 
shortly thereafter which should be sometime in the 96-h to 120-h 
points as deep convection ceases over the storm over cold SSTs

As noted previously, the wind field of Henri is expected to expand, 
especially as it interacts with a mid-latitude trough located to its 
west. Therefore, users are reminded to not focus on the exact 
forecast points as impacts will extend far from the center.
"

The winds on guidance don’t really show this. Maybe because normally we have a deep trough and low pressure west of the storm and a ridge to the east. This causes the pressure gradient to really tighten up on the east side. Sandy, Irene, Isaias etc all had this. We don’t have that with Henri. Henri looks to be a low end cat 1ish weakening before landfall as it slows over cooler waters. 

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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
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Tropical Storm Henri Discussion Number  18
NWS National Hurricane Center Miami FL       AL082021
500 AM EDT Fri Aug 20 2021

Henri's low-level center has been peaking out from under the north 
side of the deep convective mass, resulting from continued 20-25 kt 
of northerly shear.  Maximum winds are still estimated to be 55 kt 
based on T3.5 Dvorak estimates from TAFB and SAB.  

Henri still has a motion toward the west-northwest, or 300/8 kt, 
but it is about ready to make the sharp right turn that we've been 
expecting.  A shortwave trough currently over the central 
Appalachians is forecast to close off by Saturday, with Henri 
accelerating northward on the east side of this feature through the 
weekend.  Some global models show Henri merging with the 
mid-/upper-level low as the cyclone approaches southern New 
England, which induces a slight bend of Henri's forecast track to 
the left.  Nearly all track models now show Henri's center reaching 
the coast of southern New England, and the new NHC track forecast 
has been nudged westward in the direction of HCCA and the other 
consensus aids.  After day 3, Henri is forecast to eject 
northeastward across the Gulf of Maine toward Atlantic Canada.

The strong shear affecting Henri is forecast to begin weakening 
later today, and SHIPS diagnostics indicate that it could drop to 
less than 10 kt in about 36 hours.  In addition, Henri will be 
traversing very warm waters for the next 48 hours before it crosses 
the north wall of the Gulf Stream.  Therefore, strengthening is 
anticipated for the next 2 days, with Henri likely to become a 
hurricane by Saturday.  After 48 hours, Henri's expected slower 
motion over the colder water south of New England should induce 
quick weakening, but it may not be quick enough to keep Henri from 
reaching the coast as a hurricane.  Faster weakening is anticipated 
after Henri's center moves over land, and simulated satellite 
imagery from the GFS and ECMWF models suggest that deep convection 
could dissipate by day 4, making Henri a post-tropical low at that 
time.  Global models suggest that Henri may dissipate by day 5, but 
for the time being a day 5 point is being kept for continuity.

Based on the new forecast, tropical-storm-force wind radii will be 
approaching the coast of southern New England in about 48 hours.  
Given the still-present uncertainties in Henri's future track and 
intensity and the hazards that the storm may cause, storm surge and 
hurricane watches are now being issued for portions of Long Island, 
Connecticut, Rhode Island, and southeastern Massachusetts.  Users 
are reminded to not focus on the exact forecast points as impacts 
will extend far from the center.

Key Messages:

1. Henri is forecast to be near the northeast coast of the U.S.
on Sunday and Monday, and the risks of storm surge, wind, and rain
impacts in portions of southern New England and eastern Long Island
are increasing.  Hurricane and storm surge watches are now in 
effect for portions of Long Island, Connecticut, Rhode Island, and 
southeastern Massachusetts. Additional watches or warnings may be 
required later today. 

2. 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.

3. Heavy rainfall may lead to flash, urban, and small stream 
flooding over portions of southern New England Sunday into Monday.


FORECAST POSITIONS AND MAX WINDS

INIT  20/0900Z 30.2N  73.1W   55 KT  65 MPH
 12H  20/1800Z 31.0N  73.5W   55 KT  65 MPH
 24H  21/0600Z 33.0N  72.9W   60 KT  70 MPH
 36H  21/1800Z 36.1N  71.8W   70 KT  80 MPH
 48H  22/0600Z 39.1N  71.1W   75 KT  85 MPH
 60H  22/1800Z 41.1N  71.3W   65 KT  75 MPH
 72H  23/0600Z 42.2N  71.6W   50 KT  60 MPH...INLAND
 96H  24/0600Z 43.5N  70.0W   35 KT  40 MPH...POST-TROPICAL
120H  25/0600Z 45.3N  63.0W   30 KT  35 MPH...POST-TROP/EXTRATROP
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24 minutes ago, CoastalWx said:

If this hooks into LI and NYC most of the area sees very little outside of CT and RI coasts. There is no ET transition and wind field is tight and not expanding.  Kind of yawn solution.

Looks like a Maine weekend is aved.  And so goes another scintillating tropical season in NE.  :)

 

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