Groton, CT Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for Groton, CT


December 8, 2023 5:52 PM EST (22:52 UTC)
Sunrise 7:00AM   Sunset 4:20PM   Moonrise  3:21AM   Moonset 2:37PM 

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. Privacy and Cookie policy

Marine Forecasts
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ANZ332 Long Island Sound East Of The Mouth Of The Connecticut River- 337 Pm Est Fri Dec 8 2023
.storm watch in effect from Sunday afternoon through late Sunday night...
Tonight..S winds 5 to 10 kt. Seas 1 ft or less.
Sat..SE winds 5 to 10 kt. Seas 1 ft or less.
Sat night..S winds around 5 kt. Seas 1 ft or less. Patchy fog. Vsby 1 to 3 nm.
Sun..S winds 10 to 15 kt with gusts up to 20 kt, increasing to 20 to 25 kt with gusts up to 35 kt in the afternoon. Seas 1 ft or less, then 2 to 4 ft in the afternoon. Chance of rain in the morning, then rain in the afternoon with vsby 1 to 3 nm.
Sun night..S winds 25 to 30 kt with gusts up to 50 kt. Seas 4 to 6 ft. Rain. Vsby 1 to 3 nm.
Mon..W winds 20 to 25 kt. Gusts up to 50 kt, decreasing to 35 kt in the afternoon. Seas 3 to 5 ft. Rain likely in the morning.
Mon night..W winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Seas 3 to 5 ft.
Tue..W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Tue night..W winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft.
Wed..W winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Wed night..NW winds 15 to 20 kt with gusts up to 25 kt. Seas around 2 ft.

ANZ300 337 Pm Est Fri Dec 8 2023
Synopsis for the long island and connecticut coastal waters.. High pressure will slowly move offshore tonight through Saturday. At the same time, a warm front will stalled in the area and head northeast on Saturday. A strong frontal passage will occur Sunday night, with low pressure deepening along it as it tracks into canada on Monday. A broad area of high pressure then builds in through the rest of next week.


7 Day Forecast for Marine Location Near Groton, CT
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Area Discussion for - New York City/Upton, NY
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FXUS61 KOKX 082142 AFDOKX

Area Forecast Discussion National Weather Service New York NY 442 PM EST Fri Dec 8 2023

SYNOPSIS
High pressure will slowly move offshore tonight through Saturday. At the same time, a warm front will stall in the area and head northeast on Saturday. A strong frontal passage will occur Sunday night, with low pressure deepening along it as it tracks into Canada on Monday. A broad area of high pressure then builds in through the rest of next week.

NEAR TERM /UNTIL 6 AM SATURDAY MORNING/
Upper level ride will move over the Northeast tonight as the center of surface high pressure slides off the East Coast. The main forecast challenges tonight will be if there will be any fog and/or stratus developing late tonight. NAM forecast soundings show a low level inversion late tonight well inland with abundant low level moisture trapped underneath. Other models show a hint of this inversion, but not nearly as deep. Meanwhile, ensembles show high probabilities of fog and stratus, mainly well the aforementioned well inland areas. Therefore, opted to continue mention of patchy fog and increasing clouds late. This will mean that temperatures in these areas will likely drop fairly quickly once sun sets tonight, but then remain steady and then slowly increase through the rest of the night, mainly sometime after 3 am. There is also the possibility of freezing fog in the areas well north of the area, but with even more uncertainty, did not mention in the actual forecast. If this does occur, then an SPS may need to be issued later tonight.

SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/
Any fog burns off early in the morning Saturday as the lower layers warm. Weak warm advection and rising heights will mean warmer conditions, with highs rising into the 50s region-wide. More in the way of clouds are expected as a weak surface trough moves toward the area, but if clouds break out a bit, even warmer temperatures are possible. Saturday night will see a slight chance to low end chance for light rain with the warm front still in the forecast area. The only areas the might not see any precipitation will be eastern areas. With continued abundant low level moisture, patchy fog will once again be possible, though a bit more widespread than the previous night. Lows will also be warmer given continued weak warm air advection, ranging from the 30s well inland to the middle 40s across the metro area.

LONG TERM /SUNDAY THROUGH FRIDAY/
A flood watch has been issued for all but the Twin Forks of LI, and a high wind watch has been issued for all of LI, along with Brooklyn and Queens. Both watches start at 4 pm Sun.

A cold front approaches on Sun, with strong moisture transport ahead of it. High pres over the Atlc will allow for a strong pres gradient, so increasing winds can be expected on Sun. The upr trof is still modeled to be near Lake Erie 00Z Mon, so the heaviest rainfall should hold off until late Sun aft/eve and ngt with the upr support, and only light to mdt rain for the most part during the day on Sun.

By Sun eve, rainfall increases in coverage and intensity across the region. With the strong, deep lift displayed in the modeled omega fields, isold tstms possible. The rain tapes off from W to E after midnight as the cold front sweeps thru. There is a good chance that the highest rainfall totals end up in CT with this event due to speed convergence on sly flow.

It is important to note that rainfall timing may change depending on the exact track and timing of the sys overall, and this far out it is entirely possible. There is already some spread in the models, which is why the consensus approach has been taken attm.

Any timing chances would impact the wind fcst as well. Based on the current consensus however, peak sly winds develop Sun eve and end with the fropa. The most significant winds occur as the low begins to intensify Sun ngt. For fcst gusts, generally mixed down 80 percent of the h95 winds from the 12Z NAM12. This method yields peak gusts around 60 mph. With 55kt or higher modeled around 1000 ft, these numbers seemed reasonable.

As the sys exits Mon, gusty NW flow but speeds blw advy lvls attm.
There could also be a brief changeover to snow, particularly across the interior, early Mon before ending. Little to no accumulations are expected attm.

High pres builds S of the region thereafter, keeping fair weather locked in place for the rest of the week. The NBM yields temps close to or slightly blw normal Tue-Fri.

AVIATION /22Z FRIDAY THROUGH WEDNESDAY/
High pressure will slowly move offshore through Saturday.

Mainly VFR conditions are forecast through the TAF period. The only exception is the potential for MVFR to IFR fog late tonight into early Saturday morning, mainly for KSWF and KHPN.

Light flow is forecast through the TAF period with wind speeds below 10 kt. S-SE winds into early this evening become light and/or variable tonight. Wind gradually become SE again late Saturday morning into the afternoon.

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

MVFR visibilities possible early Saturday morning.

OUTLOOK FOR 18Z SATURDAY THROUGH WEDNESDAY...

Saturday Afternoon-Night: VFR.

Sunday: MVFR or lower in developing showers from west to east through the day. S winds 15-20 kt with gusts 25-30 kt in the afternoon.

Sunday Night: IFR in showers. Isolated thunderstorms possible. S winds 15-25 kt with gusts 25-40 kt, strongest near the coast. A few gusts up to 55 kt possible near the coast.

Monday: MVFR or lower early in showers, then VFR. S-SW wind gusts 30- 40 kt eastern Long Island and Southeast Connecticut early.
Otherwise, W-WNW 15-20 kt with gusts 25-35 kt.

Tuesday: VFR. SW gusts 15-20 kt in the afternoon.

Wednesday: VFR. W gusts 15-20 kt in the afternoon.

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

MARINE
Conditions are expected to remain below SCA criteria from tonight through Saturday night as a weak pressure gradient remains in place.

Strong sly winds develop late Sun and Sun ngt. A storm watch has been issued for all but portions of the Sound and Harbor, where a gale watch has been issued. NW gales possible behind the sys on Mon, then winds drop blw sca lvls on Tue. Winds are likely to remain blw sca lvls Wed and Thu, but seas on the ocean may linger aoa 5 ft.

HYDROLOGY
There are no hydrologic concerns through Saturday night.

Around 2 inches of rain is likely Sun and Sun night. Locally higher amounts in excess of 3 inches are possible. Adjustments to the fcst are possible based on changes in the overall track, timing, and intensity of the system. A flood watch has been issued for all by the Twin Forks. Widespread urban and poor drainage flooding is likely, with some areas of more significant flooding possible, including the flooding of some rivers and stream.

TIDES/COASTAL FLOODING
A strong cold front will bring increasing southerly flow late Sunday into Sunday night. The system brings potential for minor coastal flooding with the Monday morning high tide cycle.
However, the strongest southerly flow is most likely to occur between high tide cycles. Winds will quickly shift to the west early Monday morning, which will help keep water levels down during times of high tide.

There remains a large amount of spread in the surge guidance.
The highest chance for minor coastal flooding at this time appears to be for the south shore back bays and over the western Long Island Sound along the Westchester and Fairfield coasts.
If the higher end of the surge guidance and stronger onshore winds linger closer to high tide, then minor coastal flooding would be more widespread, and a localized moderate coastal flooding threat would exist.

OKX WATCHES/WARNINGS/ADVISORIES
CT...Flood Watch from Sunday afternoon through late Sunday night for CTZ005>012.
NY...Flood Watch from Sunday afternoon through late Sunday night for NYZ067>075-078-080-176>179.
High Wind Watch from Sunday afternoon through late Sunday night for NYZ075-078>081-176>179.
NJ...Flood Watch from Sunday afternoon through late Sunday night for NJZ002-004-006-103>108.
MARINE...Gale Watch from Sunday afternoon through late Sunday night for ANZ331-335-338.
Storm Watch from Sunday afternoon through late Sunday night for ANZ332-340-345-350-353-355.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesinHgDewPt
LDLC3 - New London Ledge CT - Ledge Light Weather 0 mi43 min SSW 8.9G11 46°F
NLHC3 5 mi53 min 44°F 50°F30.19
MTKN6 - 8510560 - Montauk, NY 19 mi53 min 45°F 47°F30.16
QPTR1 - 8454049 - Quonset Point, RI 41 mi53 min SSW 6G7 42°F 44°F30.24
NWPR1 - 8452660 - Newport, RI 42 mi53 min S 2.9G4.1 42°F 47°F30.24
PDVR1 42 mi53 min SSE 5.1G6 42°F 30.2335°F
NWHC3 - 8465705 - New Haven, CT 44 mi53 min SSE 1.9G2.9 43°F 47°F30.21
NAXR1 - Narragansett Bay Reserve, RI 46 mi68 min W 1.9 39°F 30.2432°F
PRUR1 46 mi53 min 39°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 46 mi53 min 0G1.9 40°F 30.26
CPTR1 - 8452944 - Conimicut Light, RI 48 mi53 min SE 5.1G6 41°F 47°F30.23

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Wind History for Quonset Point, RI
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KGON GROTONNEW LONDON,CT 3 sm56 minSSW 0910 smPartly Cloudy45°F36°F70%30.21
KWST WESTERLY STATE,RI 15 sm20 minS 0410 smPartly Cloudy45°F36°F70%30.22
KMTP MONTAUK,NY 17 sm58 mincalm--45°F36°F70%30.23
KSNC CHESTER,CT 23 sm17 minSE 0310 smClear39°F36°F87%30.20

Wind History from GON
(wind in knots)


Tide / Current for New London, Connecticut
   
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New London
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Fri -- 02:20 AM EST     Moonrise
Fri -- 05:40 AM EST     2.71 feet High Tide
Fri -- 07:01 AM EST     Sunrise
Fri -- 12:18 PM EST     0.34 feet Low Tide
Fri -- 01:36 PM EST     Moonset
Fri -- 04:18 PM EST     Sunset
Fri -- 06:00 PM EST     2.18 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

New London, Connecticut, Tide feet
12
am
0.4
1
am
0.8
2
am
1.3
3
am
1.9
4
am
2.3
5
am
2.6
6
am
2.7
7
am
2.5
8
am
2.1
9
am
1.7
10
am
1.2
11
am
0.7
12
pm
0.4
1
pm
0.4
2
pm
0.8
3
pm
1.3
4
pm
1.7
5
pm
2.1
6
pm
2.2
7
pm
2.1
8
pm
1.7
9
pm
1.4
10
pm
1
11
pm
0.6



Tide / Current for The Race, Long Island Sound, New York Current
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The Race
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Fri -- 01:27 AM EST     0.00 knots Slack
Fri -- 02:20 AM EST     Moonrise
Fri -- 04:20 AM EST     2.24 knots Max Flood
Fri -- 07:00 AM EST     Sunrise
Fri -- 07:42 AM EST     -0.00 knots Slack
Fri -- 10:48 AM EST     -2.67 knots Max Ebb
Fri -- 01:36 PM EST     Moonset
Fri -- 02:12 PM EST     0.00 knots Slack
Fri -- 04:19 PM EST     Sunset
Fri -- 04:54 PM EST     2.06 knots Max Flood
Fri -- 08:11 PM EST     -0.00 knots Slack
Fri -- 11:06 PM EST     -2.35 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

The Race, Long Island Sound, New York Current, knots
12
am
-1.4
1
am
-0.5
2
am
0.6
3
am
1.7
4
am
2.2
5
am
2.1
6
am
1.6
7
am
0.8
8
am
-0.4
9
am
-1.6
10
am
-2.4
11
am
-2.7
12
pm
-2.2
1
pm
-1.4
2
pm
-0.3
3
pm
0.9
4
pm
1.8
5
pm
2.1
6
pm
1.8
7
pm
1.2
8
pm
0.2
9
pm
-0.9
10
pm
-1.9
11
pm
-2.3




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