Sunday, December8, 2019
Privacy Policy
L-36.com


Marine Weather and Tides
Old Greenwich, CT

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:04AMSunset 4:27PM Sunday December 8, 2019 7:49 AM EST (12:49 UTC) Moonrise 3:36PMMoonset 4:11AM Illumination 88% Phase: Waxing Gibbous; Moon at 11 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
    EDIT      (on/off)   Help
ANZ335 Long Island Sound West Of New Haven Ct/port Jefferson Ny- 435 Am Est Sun Dec 8 2019
Today..NE winds around 5 kt, becoming S late this morning and afternoon. Seas 1 ft or less.
Tonight..SW winds 5 to 10 kt. Seas 1 ft or less. Chance of showers after midnight.
Mon..S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 25 kt in the afternoon. Seas 1 ft or less, then around 2 ft in the afternoon. Rain. Vsby 1 to 3 nm.
Mon night..SW winds around 15 kt with gusts up to 25 kt. Seas around 2 ft. Rain in the evening, then chance of showers after midnight. Vsby 1 to 3 nm in the evening.
Tue..SW winds 10 to 15 kt. Seas around 2 ft. Chance of showers in the morning, then rain likely in the afternoon.
Tue night..NW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 1 ft or less. Rain likely. Snow likely after midnight. Vsby 1 to 3 nm.
Wed..NW winds 5 to 10 kt, becoming W 10 to 15 kt in the afternoon. Seas 1 ft or less. Chance of snow. Vsby 1 to 3 nm.
Wed night..NW winds 10 to 15 kt. Seas around 2 ft.
Thu..NW winds 10 to 15 kt. Seas around 2 ft.
Thu night..N winds 5 to 10 kt. Seas 1 ft or less.
ANZ300 435 Am Est Sun Dec 8 2019
Synopsis for the long island waters and new york harbor.. High pressure across the waters this morning will pass east by early this afternoon. A frontal system will then impact the area Monday through Tuesday night. High pressure will build in from the west Wednesday into Thursday.


7 Day Forecast for Marine Location Near Old Greenwich, CT
   Hourly   EDIT   Help
location: 41.01, -73.57     debug


Area Discussion for - New York City/Upton, NY
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS61 KOKX 081229 AFDOKX

Area Forecast Discussion National Weather Service New York NY 729 AM EST Sun Dec 8 2019

SYNOPSIS. High pressure will pass east today. A warm front will approach late tonight into Monday, and lift through to the northeast Monday night. A cold front will approach on Tuesday and slowly passes east Tuesday night into Wednesday. Arctic high pressure will then follow later in the week before another potential storm system arrives next weekend.

NEAR TERM /THROUGH TONIGHT/. Looking at a mostly sunny day today, with slowly increasing high clouds as the high moves east. High temps should be a shade warmer than a MOS blend, with lower 40s metro/coast and upper 30s inland, about 5 deg below avg.

Mid level shortwave energy arrives beginning this evening, with chances for showers increasing from the south mainly after midnight. The 00Z NAM introduced showers this evening which looked too fast, so sided more with timing of other guidance with a start time past midnight. Early evening lows should be followed by steady or rising temps in deep layer WAA, with temps by daybreak ranging from the 30s well north/west, to the mid 40s NYC metro/most of Long Island, to the lower 50s ern Long Island. Precip arrives too late for any freezing rain issues in western Orange County where temps by daybreak may still be just below 32F.

SHORT TERM /MONDAY THROUGH TUESDAY/. Should see rainfall with the approaching frontal sys in two primary waves. The first will come with the warm frontal approach/passage today tonight, then should a break in precip as we get into the warm sector late Mon night and Tue AM before precip with and mostly behind the approaching cold front arrives Tue afternoon/night.

Model consensus is for axis of heavier precip with the warm front to be places farther east, more across Long Island and SE CT than areas to the west. Removed mention of thunder in most places as elevated instability should be minimal, though there does appear to be a window of opportunity for heavier showers and isolated thunder across eastern Long Island and coastal SE CT with warm fropa that may have to be watched for strong wind potential as well.

Temps in the warm sector will be on the mild side, with widespread 50s for highs on Mon, even lower 60s across ern Long Island per consensus MOS. Temps should not fall much Mon night, the should be even milder on Tue, with lower 60s metro/Long Island/SE CT, and 55-60 elsewhere.

LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/. As another shortwave rotates around the back side of the upper trough in central Canada, there are indications that rain moves just east, with additional rain/precip shield tracking northeast on the back side of the front Tuesday night into Wednesday due to upper level support. Assuming that does indeed occur, colder air will move in behind the front which will result in a transition from rain to snow, mix in between. This could result in light snow accumulations later Tuesday night into Wednesday, NW to SE.

The upper trough weakens as it pivots east, and sfc high pressure builds in from the west late Wed, Wed night and Thursday. This will be the period of dry, but cold weather. Could be looking at the coldest air of the season, with temps struggling to reach or exceed freezing Thursday after a cold start to the day.

Shortwave ridging moves east Thu night, with sfc high moving north and east of the area. Easterly flow then sets up, with dry conditions likely lingering into Friday. Thereafter, model spread grows, with latest run of the operational GFS quicker with southern shortwave's movement east, which steers a sfc low out of the Gulf of Mexico and off the SE coast later Friday and Friday night, whereas Canadian and ECMWF are much slower with these features. Eventually, precip should move back in from the south by Saturday, but big difference in the upper level pattern are noted in the global models, with GFS phased with northern stream shortwave and southern stream. Canadian and ECMWF look much different (lack of phasing between the two), so plenty of time to iron out these details as the event draws near.

Temps fall below normal after cold fropa into Thursday night, then moderate late in the week.

AVIATION /12Z SUNDAY THROUGH THURSDAY/. VFR. High pressure will be over the terminals this morning, then passes offshore by afternoon.

Light and variable winds becomes S by late morning and increase to around 10 kt with gusts 15-18kt by early afternoon. Some spots may be less frequent. Gusts are lost by early this evening.

MVFR/IFR conditions develop late tonight into Monday morning as rain moves in ahead of an approaching warm front from the south.

OUTLOOK FOR 12Z MONDAY THROUGH THURSDAY. Monday. MVFR/IFR in widespread rain. S G20-25kt, mainly at the coastal terminals during the afternoon/night, with a chance of LLWS. Slight chance thunder Monday afternoon/early evening at KISP and KGON. Tuesday. MVFR or lower in showers, possibly changing to snow overnight. SW gusts around 20 kt possible. Winds shift to the NW with a cold frontal passage in the late afternoon/evening. Wednesday. MVFR or lower in a chance of snow in the morning. W-NW G20-25kt possible. Thursday. VFR.

MARINE. High pressure over the waters this morning will give way to an approaching frontal system that will impact area through mid week. This will result in a strengthening southerly flow today through Monday night.

Marginal SCA conditions are forecast on the ocean waters tonight with a short period where the winds fall off during the early morning to daybreak timeframe. Winds then quickly ramp back up by late Monday morning with the potential for gale gusts on the ocean waters by afternoon and SCA conditions elsewhere. These conditions will persist into Monday night. Thus, a gale watch has been issued for the ocean waters Monday afternoon and night. A SCA will likely be issued for the remaining waters later today. However, there is some uncertainty with the magnitude of the winds during this time due to a strengthening inversion across the waters, which will limit the high wind potential. Seas on the ocean are forecast to build 7 to 12 ft.

Winds and seas will then diminish as a cold front approaches Tuesday, but remain above 5 ft on the ocean through at least Tuesday night. The front passes through the area Tuesday night with marginal SCA conditions possible Wednesday into Thursday morning in a W-NW flow.

There is the potential for another storm system to impact the waters at the end of the week.

HYDROLOGY. A significant long duration rainfall event is expected from late Sunday night into Wed. Event total QPF likely to range from 1.5-2.0 inches, locally 2-3 inches across eastern Long Island and southern CT. Heaviest rain should occur be Monday afternoon/eve. The long duration of the event should preclude widespread flooding. Nuisance/poor drainage flooding is the most likely outcome.

EQUIPMENT. NYC NOAA Weather Radio Station KWO35 (162.55 MHz) is still operating at reduced power.

OKX WATCHES/WARNINGS/ADVISORIES. CT . None. NY . None. NJ . None. MARINE . Gale Watch from Monday afternoon through late Monday night for ANZ350-353-355. Small Craft Advisory from 5 PM this afternoon to 4 AM EST Monday for ANZ350-353-355.



SYNOPSIS . Goodman/PW NEAR TERM . Goodman SHORT TERM . Goodman LONG TERM . Goodman/PW AVIATION . DW MARINE . DW HYDROLOGY . Goodman/PW EQUIPMENT . //


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44040 - Western Long Island Sound 4 mi64 min ENE 3.9 G 5.8 30°F 16°F
44022 - Execution Rocks 12 mi49 min ESE 3.9 G 7.8 29°F 32°F21°F
KPTN6 - 8516945 - Kings Point, NY 17 mi49 min ESE 4.1 G 5.1 28°F 43°F1034.8 hPa (+0.6)
BRHC3 - 8467150 - Bridgeport, CT 24 mi55 min NNE 1.9 G 2.9 20°F 44°F1034.1 hPa
BATN6 - 8518750 - The Battery, NY 32 mi49 min 30°F 46°F1034.1 hPa (+0.4)
44069 33 mi49 min NE 3.9 G 5.8 29°F 37°F19°F
ROBN4 - 8530973 - Robins Reef, NJ 36 mi49 min NNW 1 G 2.9 29°F 1033.9 hPa (+0.3)
BGNN4 - 8519483 - Bergen Point West Reach, NJ 40 mi49 min 29°F 44°F1034.3 hPa (+0.4)
MHRN6 40 mi49 min NNE 4.1 G 5.1
NWHC3 - 8465705 - New Haven, CT 40 mi49 min ENE 1.9 G 4.1 21°F 39°F1034.2 hPa (+0.9)
SDHN4 - 8531680 - Sandy Hook, NJ 44 mi49 min Calm G 1 32°F 40°F1034.4 hPa (+0.5)
44065 - Entrance to New York Harbor 45 mi29 min ENE 3.9 G 7.8 35°F 49°F1034.5 hPa21°F

Wind History for Kings Point, NY
(wind in knots)    EDIT      (on/off)   Help
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
Last
24hr
N15
G19
N17
G23
N17
G23
N14
G18
N16
G20
N11
G15
N15
NE12
G16
N12
N11
G14
N10
G13
N13
G17
N13
G17
NE10
G16
NE10
N8
NE7
E2
G6
SE2
SE4
SE3
SE2
SE4
SE4
1 day
ago
SW7
SW9
G12
SW12
SW11
G14
SW11
G17
SW14
G18
SW9
SW16
SW17
G22
W12
G17
NW14
G17
NW13
G17
N24
G29
N14
G20
N19
G27
N17
G21
N17
N15
N15
N15
G19
NE11
G14
N11
N10
G13
N13
2 days
ago
NW11
G14
NW13
G16
NW17
G22
N25
G31
N21
G26
N24
G30
N18
G23
N24
G31
N18
G26
NW16
N14
G18
N14
G17
N13
G22
N14
G19
N19
G24
N17
G22
N11
G14
N12
G16
NW13
G17
N11
G15
N8
G12
NW6
NW7
NW11

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
White Plains - Westchester County Airport, NY9 mi1.9 hrsN 010.00 miFair20°F12°F74%1033.9 hPa
Farmingdale - Republic Airport, NY21 mi56 minN 310.00 miFair22°F16°F78%1034.4 hPa
New York, La Guardia Airport, NY23 mi58 minE 810.00 miPartly Cloudy28°F16°F60%1034.2 hPa

Link to 5 minute data for KHPN

Wind History from HPN (wind in knots)
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
Last 24hrNW5NW9NW10W9
G17
NW12NW14
G20
NW16NW13NW11W4NW10NW5NW6NW8NW3NW4NE5NE3--NW3CalmCalmCalmCalm
1 day agoS4CalmS75S8S8S6S456W10
G17
W10
G17
NW13NW19
G29
NW13
G20
W7NW12
G20
NW13
G20
NW14NW14NW9NW8W8W7
2 days agoW5W14
G20
NW16
G27
W17
G24
W13
G26
NW17
G30
NW16
G21
NW12
G23
W11
G21
W12NW15
G25
W10
G20
NW12
G19
W15
G23
NW18
G28
W16
G24
NW13
G22
W11W10
G16
W9W4W4CalmCalm

Tide / Current Tables for Cos Cob Harbor, Connecticut
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Cos Cob Harbor
Click for Map
Sun -- 02:05 AM EST     0.79 feet Low Tide
Sun -- 03:11 AM EST     Moonset
Sun -- 07:06 AM EST     Sunrise
Sun -- 08:10 AM EST     7.46 feet High Tide
Sun -- 02:35 PM EST     Moonrise
Sun -- 02:40 PM EST     0.50 feet Low Tide
Sun -- 04:25 PM EST     Sunset
Sun -- 08:34 PM EST     6.79 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
2.41.30.81.22.43.95.56.87.47.16.14.63.11.70.70.61.32.74.35.76.66.764.7

Tide / Current Tables for Throg's Neck, Long Island Sound, New York Current
   EDIT      (on/off)   Help   One Week of Data
Throg's Neck
Click for Map
Sun -- 02:31 AM EST     0.87 knots Max Flood
Sun -- 03:11 AM EST     Moonset
Sun -- 05:31 AM EST     -0.00 knots Slack
Sun -- 07:06 AM EST     Sunrise
Sun -- 08:48 AM EST     -0.65 knots Max Ebb
Sun -- 11:52 AM EST     0.00 knots Slack
Sun -- 02:36 PM EST     Moonrise
Sun -- 02:57 PM EST     0.95 knots Max Flood
Sun -- 04:27 PM EST     Sunset
Sun -- 06:13 PM EST     -0.00 knots Slack
Sun -- 09:16 PM EST     -0.65 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
00.30.80.80.40.1-0.1-0.3-0.6-0.6-0.5-0.200.20.710.70.30-0.2-0.5-0.6-0.6-0.3

Weather Map
       (on/off)   Help Weather Map
wmap_A
GEOS Local Image of Northeast    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
Wind Forecast for New York City/Upton, NY (7,2,3,4)
      (on/off)   Help

Ground Weather Radar Station Upton, NY
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

Cookie Policy:
This webiste uses cookies to save your settings. No personal information is saved. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. I do not keep site logs longer than I need to to keep bad actors off the site. Basically, I delete them after looking at them. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
Disclaimer:
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 numerious 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.