Tuesday, September28, 2021
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Marine Weather and Tides
Greenport, NY

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:43AMSunset 6:38PM Tuesday September 28, 2021 12:20 PM EDT (16:20 UTC) Moonrise 11:07PMMoonset 2:08PM Illumination 52% Phase: Third Quarter Moon; Moon at 22 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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ANZ340 Peconic And Gardiners Bays- 1122 Am Edt Tue Sep 28 2021
Today..SW winds 5 to 10 kt. Waves 1 ft or less. Scattered showers and isolated tstms this afternoon.
Tonight..NW winds 10 to 15 kt, becoming N 15 to 20 kt with gusts up to 25 kt after midnight. Waves 1 to 2 ft. Showers likely with chance of tstms this evening. Some tstms may produce gusty winds and small hail this evening with vsby 1 to 3 nm.
Wed..N winds 10 to 15 kt. Waves 1 to 2 ft.
Wed night..N winds 5 to 10 kt. Waves 1 ft or less.
Thu..N winds around 10 kt. Waves 1 ft or less.
Thu night..N winds around 10 kt. Waves 1 ft or less.
Fri..NW winds around 10 kt. Waves 1 ft or less.
Fri night..NW winds 5 to 10 kt. Waves 1 ft or less.
Sat..NW winds around 10 kt with gusts up to 20 kt. Waves 1 to 2 ft.
Sat night..NW winds 5 to 10 kt. Waves 1 ft or less. Winds and waves may be higher in and near tstms.
ANZ300 1122 Am Edt Tue Sep 28 2021
Synopsis for the long island waters and new york harbor.. A cold front will approach today and pass through this evening, followed by building high pressure. A series of weak cold fronts will then move through Wednesday into Thursday. High pressure will then build in and remains through the weekend. A frontal system will approach late Sunday into the beginning of next week.


7 Day Forecast for Marine Location Near Greenport, NY
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location: 41.1, -72.37     debug


Area Discussion for - New York City/Upton, NY
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FXUS61 KOKX 281605 AFDOKX

Area Forecast Discussion National Weather Service New York NY 1205 PM EDT Tue Sep 28 2021

SYNOPSIS. A cold front passes through the area this afternoon and evening, followed by high pressure. A series of weak cold fronts will move through Wednesday into Thursday. High pressure will then build in and remains through the weekend. A frontal system will approach late Sunday into the beginning of next week.

NEAR TERM /THROUGH TONIGHT/. Made forecast adjustments based on current and expected convective trends going into this evening. Storms S of western Long Island ahead of MCV apparent on satellite and radar appear capable of producing small hail and gusty winds as they move across Long Island early this afternoon. Another bkn convective line may develop NW of NYC late this afternoon and move across the rest of the CWA through early this evening.

With sfc dewpoints in the lower 60s at the surface and H5 temps around -15C, 750-1000 J/kg of MUCAPE, and effective shear values of 25-30 kt, the chance of isolated strong to severe thunderstorms should continue. SPC has outlined the southern half of our area in a marginal risk. The primary threat will be isolated damaging wind gusts, but given the cold temperatures aloft, 1 inch hail can not be completely ruled out. Locally heavy rainfall is possible in any thunderstorms, but with quick moving storms flash flooding is not a threat. Storm total rainfall is expected to be around a quarter of an inch for most, with locally higher amounts possible.

The whole area should be dry just after midnight tonight. Behind the cold front, winds will be northwesterly as a dry airmass and high pressure build in. Dewpoints will drop into the 40s across the area. The interior should see great conditions for radiational cooling and temperatures should be able to drop into the mid 40s.

SHORT TERM /WEDNESDAY THROUGH WEDNESDAY NIGHT/. N-NW flow will continue on Wednesday. A cool day is expected, as temperatures won't make it out of the 60s for most. These highs will be a few degrees below normal for late September.

Late in the day a weak cold front swings through the area, as the aforementioned cut-off low moves further south towards the New England coast. Although moisture is very limited (PWATs .50 to .75 inches), The cold pool aloft combined with surface heating may create enough instability for an isolated light shower or two late Wednesday night.

LONG TERM /THURSDAY THROUGH MONDAY/. Models continue in good agreement with a -1 to -2 STD height 500hpa upper low, and associated deep trough, centered over New England on Thu, and then slowly retreating northeast through Canadian Maritimes this weekend. The evolution of this closed upper low and deep NE troughing is expected to keep Hurricane Sam well out to sea late this week into weekend. The main impacts for the local area will be an increasing threat for rough surf and dangerous rip currents late week into this weekend. Please refer to the National Hurricane Center for the latest forecasts on Sam.

At the surface, a weak front push through the region Thursday as the closed upper low slides through northern New England. Cyclonic flow and pva will bring considerable instability cloud cover and even potential for isolated shower across northern and eastern areas Thursday. Thereafter, Canadian high pressure builds into the region Fri into Sat, lingering into Sunday bringing dry and early fall like weather. Highs will generally be in the 60s to around 70, with lows in the 40s and 50s.

As the closed low lifts N/NE of the area this weekend, models coming into a bit better agreement with development of broad troughing over the north Central US, with a mid week SW US upper low shearing towards the region in a flattening upper flow late weekend/early next week. This will have a frontal system approaching the eastern US Sunday into early next week, but uncertainty on how much progress eastward it makes with confluent upper flow and Canadian high pressure still nosing into the NE US. This system would bring the next threat for rain early next week, but predictability low at this time.

AVIATION /15Z TUESDAY THROUGH SATURDAY/. A cold front approaches today and moves through the terminals late this afternoon into early evening. High pressure builds towards the region tonight.

VFR, outside of shra/tsra. Activity has been more widespread with the initial pre-frontal convection which may limit activity this afternoon along the actual cold front.

W/SW winds 8 to 12 kt and may briefly veer more to the west early this afternoon, but again to the W/SW ahead of the cold front. Winds become NW this evening with frontal passage. NW winds 8-12 kt with occasional gusts to 20 kt tonight.

. NY Metro (KEWR/KLGA/KJFK/KTEB) TAF Uncertainty .

Chance of MVFR in any shra/tsra. Winds may vary about 270 degrees until actual cold frontal passage early this evening. The transition to right of 310 magnetic should occur in the 21Z to 00Z window.

OUTLOOK FOR 12Z WEDNESDAY THROUGH SATURDAY. Wednesday-Thursday. VFR. NW winds. Gusts 15 to 20 kt on Wed. Isolated showers east of the NYC metro terminals Wednesday night and Thursday. Friday through Saturday. VFR.

Detailed information, including hourly TAF wind component forecasts, can be found at: https:/www.weather.gov/zny/n90

MARINE. SCA remains in effect for the ocean waters through 2 PM for 4-6 ft seas. Seas should fall below SCA criteria after this time. Occasional northerly wind gusts up to 25 knots are possible late tonight after the passage of the cold front over the ocean waters.

Winds are expected to remain below SCA criteria (NW gusts to 20 kt) with a series of weak cold fronts moving through the waters Wed thru Thu, and then diminishing further Friday into the weekend as high pressure building over the waters.

Waves are expected to be sub-sca through the remainder of the week, but energetic long period swells from Hurricane Sam will begin to affect the waters Friday and continuing to build into the weekend.

HYDROLOGY. No hydrologic impacts are expected through next Saturday.

TIDES/COASTAL FLOODING. For today, despite a developing offshore flow, a high risk of rip currents is likely with 2-ft long period ESE swells and residual 4-5 ft southerly wind waves.

For Wednesday, an offshore flow continues. Any residual waves diminish to 2-4 ft and will come out of the northeast, which is not a favorable direction. However, 1 ft waves with a long period (13 sec) out of the SE are expected, leading to a moderate risk of rip currents.

OKX WATCHES/WARNINGS/ADVISORIES. CT . None. NY . High Rip Current Risk until 9 PM EDT this evening for NYZ075- 080-081-178-179. NJ . None. MARINE . Small Craft Advisory until 2 PM EDT this afternoon for ANZ350- 353-355.



SYNOPSIS . JT/NV NEAR TERM . BG SHORT TERM . JT LONG TERM . NV AVIATION . DW/NV MARINE . BG/JT/NV HYDROLOGY . BG/JT/NV TIDES/COASTAL FLOODING . JT


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44039 - Central Long Island Sound 15 mi80 min WSW 16 G 21 72°F 72°F2 ft
LDLC3 - New London Ledge CT - Ledge Light Weather 21 mi40 min WSW 17 G 19 71°F 1008.9 hPa41°F
MTKN6 - 8510560 - Montauk, NY 22 mi50 min 72°F 71°F1009.6 hPa
NLNC3 - 8461490 - New London, CT 23 mi50 min 75°F 70°F1009.7 hPa
NWHC3 - 8465705 - New Haven, CT 31 mi50 min NW 9.9 G 13 70°F 71°F1010.5 hPa
44017 - 23 Nautical Miles Southwest of Montauk Point, NY 33 mi30 min SW 14 G 18 70°F 69°F6 ft1009.9 hPa65°F
BRHC3 - 8467150 - Bridgeport, CT 43 mi50 min NW 6 G 8 70°F 73°F1009.1 hPa
44069 47 mi65 min WSW 7.8 G 9.7 71°F 78°F66°F

Wind History for New London, CT
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chester, Chester Airport, CT21 mi25 minNW 610.00 miPartly Cloudy70°F61°F73%1010.2 hPa
The Gabreski Airport, NY23 mi27 minW 1110.00 miFair76°F61°F60%1009.9 hPa
Groton / New London, Groton / New London Airport, CT23 mi24 minSW 1210.00 miMostly Cloudy74°F63°F69%1008.9 hPa
Montauk, Montauk Airport, NY24 mi26 minW 8 mi77°F64°F64%1009.7 hPa

Link to 5 minute data for KSNC

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NW8NW10NW6CalmCalm3Calm4444W443CalmCalmCalm446Calm
2 days agoCalmCalmCalmNE73CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW7NW9
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Tide / Current Tables for Greenport, Shelter Island Sound, New York
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Shinnecock Canal, Railroad Bridge, New York Current
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Shinnecock Canal
Click for Map
Tue -- 02:51 AM EDT     -0.00 knots Slack
Tue -- 06:06 AM EDT     -1.00 knots Max Ebb
Tue -- 06:43 AM EDT     Sunrise
Tue -- 09:46 AM EDT     0.00 knots Slack
Tue -- 12:15 PM EDT     1.10 knots Max Flood
Tue -- 02:07 PM EDT     Moonset
Tue -- 03:30 PM EDT     -0.00 knots Slack
Tue -- 06:36 PM EDT     Sunset
Tue -- 06:54 PM EDT     -1.12 knots Max Ebb
Tue -- 09:58 PM EDT     Last Quarter
Tue -- 10:48 PM EDT     0.00 knots Slack
Tue -- 11:07 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.70.4-0.1-0.6-0.9-1-0.9-0.6-0.30.10.71.110.80.3-0.3-0.8-1-1.1-1-0.7-0.40.1

Weather Map
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GEOS Local Image of Northeast    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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