Tuesday, December10, 2019
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Marine Weather and Tides
Groton, 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 7:01AMSunset 4:20PM Tuesday December 10, 2019 7:04 PM EST (00:04 UTC) Moonrise 4:30PMMoonset 6:10AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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- 355 Pm Est Tue Dec 10 2019
Tonight..W winds 10 to 15 kt, becoming nw late this evening and early morning, then becoming N 15 to 20 kt late. Waves around 2 ft. Patchy fog this evening. Rain. Snow after midnight. Vsby 1 to 3 nm.
Wed..N winds 10 to 15 kt, becoming W 5 to 10 kt in the afternoon. Waves around 2 ft in the morning, then 1 ft or less. Snow in the morning. Vsby 1 to 3 nm.
Wed night..NW winds 15 to 20 kt with gusts up to 30 kt. Waves around 2 ft.
Thu..NW winds 10 to 15 kt with gusts up to 20 kt, becoming N 5 to 10 kt in the afternoon. Waves around 2 ft in the morning, then 1 ft or less.
Thu night..SE winds 5 to 10 kt. Waves 1 ft or less.
Fri..SE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Waves 1 ft or less. Chance of rain in the afternoon.
Fri night..SE winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Waves around 2 ft. Chance of rain in the evening, then rain after midnight with vsby 1 to 3 nm.
Sat..SE winds 15 to 20 kt, becoming sw 10 to 15 kt in the afternoon. Waves around 2 ft in the morning, then 1 ft or less. Rain. Vsby 1 to 3 nm.
Sat night..SW winds 10 to 15 kt. Waves around 2 ft.
Sun..W winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Waves 2 to 4 ft.
Sun night..W winds 15 to 20 kt. Waves around 3 ft.
ANZ300 355 Pm Est Tue Dec 10 2019
Synopsis for the long island waters and new york harbor.. A cold front moves through the region tonight. Arctic high pressure then builds across the region, punctuated only briefly by a secondary cold front that will pass to the north Wednesday night. The high shifts offshore Thursday night with low pressure approaching from the south Friday. This low passes through on Saturday with low pressure building back in on Sunday.


7 Day Forecast for Marine Location Near Groton, CT
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location: 41.3, -72.08     debug


Area Discussion for - New York City/Upton, NY
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FXUS61 KOKX 102344 AFDOKX

Area Forecast Discussion National Weather Service New York NY 644 PM EST Tue Dec 10 2019

SYNOPSIS. A cold front moves through the region tonight. Arctic high pressure then builds across the region, punctuated only briefly by a secondary cold front that will pass to the north Wednesday night. The high shifts offshore Thursday night with low pressure approaching from the south Friday. This low passes through on Saturday with low pressure building back in on Sunday.

NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/. Moisture advection is ongoing in broader southwest flow aloft, which combined with subtle vorticity maximums ahead of the parent upper trough will lead to a continuation of precipitation through the night for the area. Main concern into the night will be when the transition to rain/snow and then snow will occur, and how much snow accumulates. At the moment, the cold front is expected to move east of the area by midnight. Guidance has trended towards slower cold advection in its wake, meaning that temperatures will be slower to lower to near freezing and the subsequent transition in precipitation type will be delayed. Regardless, expect a period of snowfall to develop overnight, with impacts to the morning commute before snow comes to an end from west to east by late morning as drier air moves into the area. Although the snow will be wet, reducing accumulations, there is a period where flow briefly strengthens between the retreating high and approaching trough, enhancing forcing for ascent and leading to the potential for at least brief banding. Therefore, snow totals look to be on track, with around 1-2 inches across the lower Hudson Valley, northeastern New Jersey and NYC, and 2-3 elsewhere. Some locally higher amounts may be possible across portions of southern Connecticut.

SHORT TERM /6 AM WEDNESDAY MORNING THROUGH WEDNESDAY NIGHT/. Snow gradually comes to an end from west to east by late morning. Given the recent moisture and a strengthening subsidence inversion, some cloud cover may linger across the area through the afternoon, before dry advection gradually leads to its dissipation. Expect temperatures to be below normal in the mid to upper 30s, some 20 degrees colder than Tuesday.

Arctic high pressure then strengthens and builds to the west while a secondary cold front passes to the north Wednesday night. As a result, winds and the subsequent cold advection will strengthen into the overnight, with temperatures falling into the teens to mid 20s.

LONG TERM /THURSDAY THROUGH TUESDAY/. High pressure ridge shifts closer to the region on Thursday, moves through by late in the day, and then offshore through Friday. Dry weather this period with high temperatures below normal Thursday. Temperatures level out or even rise slightly Thursday night with an increase in clouds and light onshore flow. Some models show low PCPN chances by the end of the morning rush on Friday from around the city to points north and west. Should some PCPN sneak in by this time, there could be some light freezing rain primarily well north and west of the city during the first half of Friday morning. Mid levels are forecast to be dry, so ice nucleation/snow growth does not appear to be likely. Rain chances then increase some more through the rest of the forecast area Friday afternoon with temperatures moderating to near 50 by the end of the day along the coast, and 40s for most other locations.

Low pressure to the south moves closer Friday night is progged to pass over or nearby the forecast area Saturday morning. Rain is expected Friday night and Saturday and could be briefly heavy at times, but primarily moderate in intensity.

High pressure begins to build back in during Saturday night with still a chance of rain showers primarily northwest of the city, and maybe even some snow mixing in over parts of Orange County. Sunday should be dry, and the high pressure system's ridge passing through should keep us dry through Monday. Another low pressure system then approaches from the Ohio Valley Monday night with increasing chances of rain or mixed PCPN into Tuesday.

AVIATION /00Z WEDNESDAY THROUGH SUNDAY/. A cold front will move across the area tonight. High pressure builds into the region on Wednesday.

Generally VFR conditions to start the TAF period will quickly give way to MVFR and eventually IFR as steadier precipitation moves back into the region this evening. While precipitation initially starts as rain, it will change to a rain/snow mix and eventually to all snow from NW to SE. This changeover is expected to occur between 03-06Z for the Lower Hudson Valley terminals, 05-08Z for the Connecticut terminals, and 06-09Z for the NYC and Long Island terminals. Snow then continues into Wednesday morning, ending from NW to SE between 11-16Z. A brief period of moderate to locally heavy snowfall is possible in the morning if any banding sets up. Runway accumulations will generally range from 1-2 inches, with slightly higher accumulations possible for some Long Island and southeast Connecticut terminals. The timing of changes in precipitation type and the start/end time of snow could be off by 1-2 hours.

Conditions improve to VFR Wednesday afternoon once the snow ends.

Winds will continue to shift to the NW tonight at 10-12 kt. Winds diminish to 5-10 kt by Wednesday morning before shifting back to the W and increasing in speed towards the end of the TAF period. A few gusts to 20-25 kt are possible late Wednesday afternoon, primarily at the city terminals.

OUTLOOK FOR 00Z THURSDAY THROUGH SUNDAY. Wednesday night. VFR. Gusty WNW winds possible. Thursday. VFR Friday and Friday night. VFR on Friday, then MVFR possible in developing rain Friday night. Saturday. IFR in rain. LLWS possible. Sunday. Becoming VFR.

MARINE. A cold front moves across the waters tonight. Arctic high pressure then builds across the region, punctuated only briefly by a secondary cold front that will pass to the north Wednesday night. The secondary cold front may allow winds to surge to above SCA levels, with a few gusts close to gale-force possible on the ocean waters Wednesday night. Otherwise, winds gusts will generally remain below 25 kt into the mid week. Seas remain elevated at this time, but will very slowly subside into Wednesday with a brief lull in winds, before building again Wednesday night following the secondary frontal passage.

Winds and seas diminish on Thursday as a ridge of high pressure approaches the waters. Sub-advisory conditions expected by Thursday afternoon and lasting through Friday afternoon as the ridge shifts through and moves offshore. Winds and seas then increase Friday night ahead of low pressure, which is expected to pass through or nearby during Saturday morning. SCA conds are probable on the ocean, and possible on the other waters depending on the exact track of the storm. Winds and seas remain elevated on Sunday behind the storm with the potential of gale force gusts at least on the ocean.

HYDROLOGY. No hydrologic issues are expected with rain through early this evening. The rain mixes with and changes to snow early Wednesday morning. Total liquid equivalent amounts from this morning through Wednesday morning are 0.25 to 0.75 inches.

1-2 inches of rainfall with locally higher amounts are anticipated from late Friday/Friday night through Saturday. Minor nuisance flooding will be possible with this event.

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

OKX WATCHES/WARNINGS/ADVISORIES. CT . Winter Weather Advisory from 3 AM to 11 AM EST Wednesday for CTZ005>012. NY . Winter Weather Advisory from 3 AM to 11 AM EST Wednesday for NYZ070>075-078>081-176>179. NJ . Winter Weather Advisory from 3 AM to 11 AM EST Wednesday for NJZ006-104-106-108. MARINE . Small Craft Advisory until 6 PM EST Wednesday for ANZ350-353- 355.

SYNOPSIS . JC/MD NEAR TERM . MD SHORT TERM . MD LONG TERM . JC AVIATION . FEB MARINE . JC/MD HYDROLOGY . JC/MD EQUIPMENT .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LDLC3 - New London Ledge CT - Ledge Light Weather 0 mi34 min W 8.9 G 9.9 51°F 996.7 hPa50°F
NLNC3 - 8461490 - New London, CT 4 mi46 min WSW 7 G 8 54°F 46°F1011.4 hPa
MTKN6 - 8510560 - Montauk, NY 19 mi52 min 53°F 47°F1012.1 hPa
QPTR1 - 8454049 - Quonset Point, RI 41 mi52 min SW 12 G 14 52°F 45°F1011.3 hPa
NWPR1 - 8452660 - Newport, RI 42 mi52 min SW 8.9 G 12 52°F 42°F1011.4 hPa
NWHC3 - 8465705 - New Haven, CT 44 mi46 min WSW 7 G 8.9 48°F 42°F1011.5 hPa
NAXR1 - Narragansett Bay Reserve, RI 46 mi79 min WSW 8.9 51°F 1011 hPa51°F
PRUR1 46 mi46 min 53°F 53°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 46 mi46 min WSW 7 G 12 52°F 1011.6 hPa
CPTR1 - 8452944 - Conimicut Light, RI 48 mi46 min SSW 12 G 14 52°F 44°F1010.7 hPa

Wind History for New London, CT
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Groton / New London, Groton / New London Airport, CT3 mi68 minW 73.00 miLight Rain Fog/Mist52°F52°F100%1011.4 hPa
Westerly, Westerly State Airport, RI15 mi71 minWSW 54.00 miLight Rain Fog/Mist54°F50°F87%1011.7 hPa
Montauk, Montauk Airport, NY17 mi70 minWSW 9 mi54°F52°F93%1012.2 hPa
Chester, Chester Airport, CT23 mi69 minVar 4 G 115.00 miFog/Mist54°F53°F100%1011.2 hPa

Link to 5 minute data for KGON

Wind History from GON (wind in knots)
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1 day agoSW9SW12SW9S8S11S10S11SW9SW3CalmCalmCalmCalmSE7S12S6S12S19S17S11S10SW11SW7SW6
2 days agoN4NW5NW7NW6NW7N5NW4N5CalmN5N4CalmN3N3NE3CalmSE45SW7SW9SW10SW11SW7SW6

Tide / Current Tables for New London, Connecticut
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New London
Click for Map
Tue -- 01:41 AM EST     0.25 feet Low Tide
Tue -- 05:10 AM EST     Moonset
Tue -- 07:03 AM EST     Sunrise
Tue -- 07:38 AM EST     3.10 feet High Tide
Tue -- 02:24 PM EST     -0.07 feet Low Tide
Tue -- 03:29 PM EST     Moonrise
Tue -- 04:18 PM EST     Sunset
Tue -- 08:07 PM EST     2.38 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.30.30.71.42.12.733.12.82.21.610.4-000.51.21.82.22.42.31.91.4

Tide / Current Tables for The Race, Long Island Sound, New York Current (2) (expired 1993-12-31)
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The Race
Click for Map
Tue -- 12:59 AM EST     -2.95 knots Max Ebb
Tue -- 03:59 AM EST     0.00 knots Slack
Tue -- 05:10 AM EST     Moonset
Tue -- 06:45 AM EST     2.93 knots Max Flood
Tue -- 07:02 AM EST     Sunrise
Tue -- 09:49 AM EST     -0.01 knots Slack
Tue -- 01:22 PM EST     -3.68 knots Max Ebb
Tue -- 03:29 PM EST     Moonrise
Tue -- 04:19 PM EST     Sunset
Tue -- 04:40 PM EST     0.00 knots Slack
Tue -- 07:18 PM EST     2.84 knots Max Flood
Tue -- 10:22 PM EST     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-2.6-3-2.5-1.301.52.72.92.41.3-0.3-1.9-3-3.6-3.5-2.4-10.522.82.720.6-1

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for New York City/Upton, NY (19,4,5,8)
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Ground Weather Radar Station Boston, MA
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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 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.