Wednesday, October28, 2020
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Marine Weather and Tides
Greenport, NY

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:16AMSunset 5:51PM Wednesday October 28, 2020 9:42 PM EDT (01:42 UTC) Moonrise 4:57PMMoonset 4:10AM Illumination 92% Phase: Waxing Gibbous; Moon at 12 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- 746 Pm Edt Wed Oct 28 2020
.gale watch in effect from Thursday evening through Friday afternoon...
Tonight..NW winds 5 to 10 kt. Waves 1 ft or less.
Thu..N winds around 5 kt, becoming ne 10 to 15 kt with gusts up to 20 kt in the afternoon. Waves 1 ft or less. Rain. Vsby 1 to 3 nm in the afternoon.
Thu night..NE winds 15 to 20 kt, increasing to 20 to 25 kt after midnight. Waves 2 to 4 ft. Rain. Vsby 1 to 3 nm in the evening.
Fri..N winds 20 to 25 kt with gusts up to 30 kt. Waves 2 to 3 ft. Rain, mainly in the morning.
Fri night..N winds 10 to 15 kt. Waves 2 to 3 ft.
Sat..NE winds 5 to 10 kt. Waves around 2 ft in the morning, then 1 ft or less.
Sat night..S winds 5 to 10 kt. Waves 1 ft or less.
Sun..S winds 10 to 15 kt. Waves around 2 ft. Chance of rain.
Sun night..SW winds around 15 kt, becoming W after midnight. Waves around 2 ft. Chance of rain in the evening.
Mon..NW winds around 20 kt. Waves around 2 ft.
Mon night..NW winds 15 to 20 kt. Waves around 2 ft.
ANZ300 746 Pm Edt Wed Oct 28 2020
Synopsis for the long island waters and new york harbor.. The remnants of zeta will pass by south of the area on Thursday followed by a secondary coastal low Thursday night into Friday morning. Strong high pressure will quickly build Friday night and into the first half of the weekend. A cold front then moves through Sunday night, followed by high pressure returning through the middle of the 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 282151 AFDOKX

Area Forecast Discussion National Weather Service New York NY 551 PM EDT Wed Oct 28 2020

SYNOPSIS. The remnants of Zeta will pass by south of the area on Thursday followed by a secondary coastal low Thursday night into Friday morning. Strong high pressure will quickly build Friday night and into the first half of the weekend. A cold front then moves through Sunday night, followed by high pressure returning through the middle of the week.

NEAR TERM /UNTIL 6 AM THURSDAY MORNING/. Forecast on track this evening. Dry conditions will remain in place under mostly cloudy skies and fairly light winds as a brief ridge of weak high pressure moves over the area tonight. Temperatures tonight will be in the middle 40s for the Interior and low 50s near and along the coast.

The remnants of Zeta will approach the area from the southwest overnight with rain showers possible from the city south and west toward daybreak.

SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/. As moisture overspreads the region from west to east, a persistent steady rain is anticipated to encompass the entire region by mid- morning. The steady rain will become moderate in intensity through the afternoon as winds pick up from the Northeast. The remnant low of Zeta will pass by south of Long Island toward evening bringing with it some pockets of locally heavy rain along the coast. Once Zeta pushes offshore by Midnight on Friday, the heaviest rain will have moved offshore with it. However, persistent light rain or rain showers will remain likely through all of Friday night as a secondary low develops in the wake of Zeta, south of the area.

Models have been becoming better in line with how the remnants of Zeta interact with the longwave trough and upper-level low. Zeta is moving along quickly enough as to not completely phase with the large scale trough, preventing the combining of the remnants of Zeta and the developing coastal low. Models continue to distinguish these low pressures as two separate features immediately following each other. The secondary coastal low will allow for the wind to shift more northerly allowing for the advection of colder air into the area from the north. The air may be cold enough to result in a brief mix with some snow flakes for the extreme northwestern portions of the area early in the morning on Friday as the precipitation is departing the area.

Overall, rainfall totals of 1 to 2 inches are expected with the higher values near and along the coast, namely the NYC metro and Long Island.

LONG TERM /FRIDAY THROUGH WEDNESDAY/. Model guidance continues to trend further south and east with the secondary coastal low early Friday morning. The remnants of Zeta will be well offshore by this time. The phasing of the northern and southern streams appears to occur too late for any significant precipitation with the secondary coastal low, likely due to an overall progressive flow pattern. Precipitation will continue early Friday morning, but will likely be gradually diminishing in coverage an intensity. With the northern stream beginning to sink southward, colder air will be drawn into the region from the north. Some interior locations could see the rain mix with or change to snow as the precipitation ends. It is going to be quite difficult for any accumulation due to warm grounds, marginal surface temperatures, and loss of lift within the snow growth zone. While not included in the grids at this time, some sleet could mix with the rain forecast soundings indicate loss of saturation above -8C Friday morning. Elsewhere, all rain is expected Friday morning. Additional liquid equivalents on Friday should be from around a quarter inch or less. Trace to a dusting on grassy surfaces is possible inland, mainly north and west of I-84.

Dry conditions should return Friday afternoon as the low moves well east of the 40N/70W benchmark. It will remain breezy through the day with northerly wind gusts 20 to 30 mph, highest near the coast. Friday will also end up as the coldest day of the 2020 Fall season with high temperatures not rising out of the 40s. Highs will range from the lower 40s inland to the middle and upper 40s near the coast.

Cold high pressure builds over the region Friday night. Low temperatures look to fall into the 20s inland and the lower and middle 30s near the coast. Friday night will likely be the first widespread freeze for much of the region. Winds may stay elevated a bit near the coast but otherwise skies will be mostly clear along with dew points well into the 20s. The high settles over the area on Saturday with highs continued below normal in the 40s to near 50s degrees. Another chilly night is in store Saturday night with temperatures around freezing inland ranging to the upper 30s to near 40 elsewhere. The high moves offshore Saturday night into Sunday morning, setting up a return flow. Warm advection will increase during this time as the next upper trough and cold front approach from the west. Some light rain may occur during the day on Sunday in the warm advection regime. Temperatures rebound close to normal in the upper 50s to near 60 degrees. The cold front should push through Sunday night, which will continue a chance of rain and bring another shot of colder air for Monday.

The upper trough axis swings across on Monday. The flow aloft will be cyclonic and some of the models indicate lake effect moisture making it into the area. Have left the forecast dry, but it would not be out of the question for a rain or snow shower to make it into the interior in the afternoon Monday. The trough moves further offshore Monday night with high pressure and building heights Tuesday into Wednesday. Temperatures will be below normal Monday, then slowly trend towards normal by middle of the week.

AVIATION /22Z WEDNESDAY THROUGH MONDAY/. Weak high pressure builds in from the west through tonight.

Mainly MVFR to start, improving to VFR late aftn/early evening. NW-W winds under 10 kt.

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

Amendments likely for timing of category changes with the improvement to VFR this afternoon.

OUTLOOK FOR 18Z THURSDAY THROUGH MONDAY. Thu PM. IFR in rain. NE gusts 20-25 kt. Thu Night. IFR. Rain with NNE winds 20-30 kt. Higher gusts possible near the coast.. Fri. IFR early, improving to VFR late. Rain ending, possible mixed with snow as it ends at KSWF. N winds gradually decreasing. NE-N winds near 20 kt with gusts 25-30 kt during the day along the coast. Sat. VFR with light SW flow. Sun. MVFR and -shra possible with SW winds near 15 kt with gusts 25-30 kt. Mon. Mainly VFR. NW winds 15-25kt with gusts 30-35kt.

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

MARINE. Sub SCA conditions will take place tonight with the winds relatively light. Seas on the ocean will be mainly around 3 to 4 feet through Thursday morning.

Seas will then begin to build later Thursday afternoon and especially into Thursday night as the winds and waves increase from south to north. SCA conditions quickly go to gale conditions for the ocean waters during Thursday evening, potentially followed by the non-ocean waters during Thursday night. By late Thursday night into Friday morning, seas on the ocean will build to around 10 ft. Gale conditions will likely continue on the ocean during the first half of Friday, followed by small craft conditions late in the day and evening. Winds on the sheltered waters should be weaker and closer to small craft levels on Friday. Winds diminish Friday night, but ocean seas will remain elevated above 5 ft, possibly through Saturday. Sub SCA conditions are forecast on all waters Saturday and Saturday night, then increase to SCA levels on the ocean Sunday into Sunday night. Gusty NW winds are expected on Monday on all waters leading to SCA conditions.

HYDROLOGY. Rainfall for Thursday into Friday morning averages around 1.5 to 2 inches. Most of this should be of fairly long duration, with only minor impacts. The period of moderate to occasionally heavier rainfall is for Thursday afternoon and evening, but nothing more than nuisance urban poor drainage type flooding is expected at this time.

TIDES/COASTAL FLOODING. The combination of a strengthening NE flow Thursday into Thursday night along with the approach of the full moon this weekend raises the potential for a widespread minor coastal flood event for the high tide cycle Friday morning. A few locations on the south shore of Nassau county, but not enough confidence for a coastal flood watch.

Model trends have continued to show a more elongated low and farther SE secondary low pressure and a better agreement on winds becoming NNE for the Friday morning high tide. Guidance has trended downward and the preference at this time was to average ETSS, ESTOFS, with a slightly higher weight to NYHOPS. This results in a surge of 2 to 2 1/2 ft with a low probability of up to 3 ft.

Localized minor coastal flooding is possible with Friday night high tide in the south shore back bays.

OKX WATCHES/WARNINGS/ADVISORIES. CT . None. NY . None. NJ . None. MARINE . Gale Watch from Thursday evening through Friday afternoon for ANZ330-335-338-340-345. Gale Warning from 8 PM Thursday to 2 PM EDT Friday for ANZ350- 353-355.

SYNOPSIS . DS/MW NEAR TERM . MW SHORT TERM . MW LONG TERM . DS AVIATION . JC MARINE . DS/MW HYDROLOGY . DS/MW TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LDLC3 - New London Ledge CT - Ledge Light Weather 21 mi108 min NW 11 G 13 53°F 1012.9 hPa49°F
MTKN6 - 8510560 - Montauk, NY 22 mi55 min 61°F
NLNC3 - 8461490 - New London, CT 23 mi55 min 62°F
NWHC3 - 8465705 - New Haven, CT 31 mi55 min 60°F
44017 - 23 Nautical Miles Southwest of Montauk Point, NY 33 mi33 min WNW 9.7 G 14 58°F 63°F1015.3 hPa52°F
BRHC3 - 8467150 - Bridgeport, CT 43 mi55 min 62°F
44069 47 mi43 min NW 1.9 G 3.9 57°F 53°F

Wind History for New London, CT
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chester, Chester Airport, CT21 mi48 minN 010.00 miFair48°F48°F100%1014.9 hPa
The Gabreski Airport, NY23 mi50 minN 010.00 miPartly Cloudy51°F50°F96%1015.5 hPa
Groton / New London, Groton / New London Airport, CT23 mi47 minNW 610.00 miFair51°F48°F89%1014.5 hPa
Montauk, Montauk Airport, NY24 mi49 minWNW 5 mi56°F50°F81%1015.2 hPa

Link to 5 minute data for KSNC

Wind History from SNC (wind in knots)
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Last 24hrN3Calm--S3CalmCalmN3CalmCalmCalmE3NE3CalmNE3N5NW7N4N3CalmNW6
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1 day agoCalmCalmCalmCalmSW4W44NW8NW6N6
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66NE5E4E6NE4NE3Calm4E4E4CalmCalmCalmCalm

Tide / Current Tables for Greenport, Long Island Sound, New York
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Greenport
Click for Map
Wed -- 02:48 AM EDT     0.38 feet Low Tide
Wed -- 04:11 AM EDT     Moonset
Wed -- 07:16 AM EDT     Sunrise
Wed -- 09:17 AM EDT     2.68 feet High Tide
Wed -- 03:17 PM EDT     0.33 feet Low Tide
Wed -- 04:56 PM EDT     Moonrise
Wed -- 05:49 PM EDT     Sunset
Wed -- 09:36 PM EDT     2.45 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.610.50.40.61.11.62.12.52.72.62.31.91.30.70.40.40.81.21.72.12.42.42.2

Tide / Current Tables for Shinnecock Canal, Railroad Bridge, New York Current
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Shinnecock Canal
Click for Map
Wed -- 02:07 AM EDT     0.00 knots Slack
Wed -- 04:11 AM EDT     Moonset
Wed -- 05:14 AM EDT     1.36 knots Max Flood
Wed -- 07:16 AM EDT     Sunrise
Wed -- 07:49 AM EDT     -0.00 knots Slack
Wed -- 10:55 AM EDT     -1.48 knots Max Ebb
Wed -- 02:31 PM EDT     0.00 knots Slack
Wed -- 04:57 PM EDT     Moonrise
Wed -- 05:32 PM EDT     1.31 knots Max Flood
Wed -- 05:50 PM EDT     Sunset
Wed -- 08:04 PM EDT     -0.00 knots Slack
Wed -- 11:13 PM EDT     -1.52 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.2-0.9-0.10.71.21.41.20.6-0.1-0.8-1.3-1.5-1.3-1-0.50.411.31.30.80.1-0.7-1.2-1.5

Weather Map
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wmap_A
GEOS Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Upton, NY
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.