Long Island Sound West of New Haven CT / Port Jefferson NY Marine Forecast
| Rest Of Today...Nw Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 2 To 4 Ft, Occasionally To 5 Ft. Wave Detail: W 2 Ft At 3 Seconds. Slight Chance Of Showers. |
| Tonight...Nw Winds 15 To 20 Kt, Diminishing To 10 To 15 Kt After Midnight. Seas 2 To 3 Ft. Wave Detail: W 2 Ft At 3 Seconds. |
| Fri...Nw Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas Around 2 Ft. Wave Detail: W 2 Ft At 3 Seconds. |
| Fri Night...Nw Winds 10 To 15 Kt. Seas Around 2 Ft. Wave Detail: Nw 1 Ft At 2 Seconds. |
| Sat...Nw Winds 5 To 10 Kt, Becoming W In The Afternoon. Seas Around 2 Ft. |
| Sat Night...Sw Winds 10 To 15 Kt, Increasing To 15 To 20 Kt After Midnight. Seas 2 To 3 Ft. Wave Detail: Sw 2 Ft At 3 Seconds. Rain. |
| Sun...W Winds 25 To 30 Kt. Seas 2 To 4 Ft, Occasionally To 5 Ft. Chance Of Rain. |
| Sun Night...W Winds 25 To 30 Kt. Seas 3 To 5 Ft, Occasionally To 6 Ft. |
| Mon...W Winds 25 To 30 Kt. Seas 3 To 5 Ft, Occasionally To 6 Ft. |
| Mon Night...W Winds 20 To 25 Kt. Seas 2 To 4 Ft, Occasionally To 5 Ft. |
| Area Forecast Discussion National Weather Service New York NY 112pm EST Thu Nov 13 2025 Synopsis A series of weak fronts/surface troughs pass across the region today. High pressure builds over the area Friday into Saturday before moving offshore Saturday night. A frontal system approaches Saturday night and moves through the region Sunday. High pressure builds in from the west Monday into Tuesday and may settle nearby on Wednesday. A warm front may approach from the south Wednesday night into Thursday. Near Term - Through Tonight The area remains in predominantly NW flow through the column as an upper trough is positioned to the northeast. Several shortwaves will continue to dive southeast from the Great Lakes region and move overhead or just north of the area through Friday. The passage of a surface trough this afternoon is allowing the wind to shift out of the NW with occasional gusts upwards of 25-30 mph. There is a chance for a brief passing shower which may contain mixed precipitation through the early evening. Any shower may enhance the winds locally with gusts upwards of 40-50 mph possible, though these should be very isolated in nature. The NW flow will advect cooler air into the area tonight with lows expected to drop into the 30s for much of the area with near 40 for the NYC metro. Outside an isolated shower that might move in from the northwest tonight, conditions should remain dry. Short Term - Friday Through Saturday Night The trough continues to shift slowly eastward during the day on Friday with surface ridge building in from the southwest. By afternoon, a final piece of shortwave energy moves overhead which may result in enhanced cloud cover and a subtle shift in the wind to a more NNW direction. The associated surface trough moves through allowing for potentially gusty flow to persist into the afternoon and evening. Gusts upwards of 20-25 mph are possible though a stronger gust to 30-35 mph isn't ruled out closer to the coast. Highs tomorrow will remain slightly below average with afternoon temperatures in the upper 40s. By Friday night, the trough shifts further east with a surface high pressure system moving into the area. This will allow both clearing skies for Friday night and a relaxing in the winds. Assuming the sky remains mostly clear and winds relax enough to decouple the BL overnight, radiational cooling may allow lows Friday night to drop into the middle to upper 20s inland and low to middle 30s for the coast. High pressure slides over the area on Saturday, very quickly pushing east of the area by the mid to late afternoon. A shift in the wind to the SW will bring in a more moderate airmass allowing highs to climb into the middle 50s along the coast. The interior areas may remain in the middle to upper 40s however. A surface frontal system being forced by an approaching shortwave trough from the northwest will begin to impact the area Saturday night. Widespread rainfall is expected to develop and overtake much of the area by early Saturday night. This rainfall will continue to move through the area overnight and into early Sunday, ahead of a cold frontal passage expected Sunday morning. Long Term - Sunday Through Thursday Key points: * A frontal system moves through Sunday morning, with lingering showers before dry conditions return Sunday afternoon. * Breezy conditions are expected behind the departing front Sunday afternoon into Monday, but winds probably remain below advisory thresholds. * Temperatures will be seasonably cool during the period except for Sunday where temperatures may briefly rebound into the upper 50s to around 60 at the coast and NE NJ. A closed low treks across northern New England, while at the surface, a cold front moves through the forecast area Sunday morning. The cold front passes east of the area by late morning into the afternoon, but only lingering showers are expected, with highest chances for precipitation across eastern areas. The cold front passage will bring in another period of breezy conditions, peaking Sunday afternoon and Monday afternoon, with perhaps a bit of a lull Sunday night, especially late (gusts are still expected, but may become more occasional), as low pressure deepens to our north across SE Canada/Maritimes and high pressure builds to our west. Winds should start diminishing Monday night as the high pressure moves closer to the area. Mean upper troughing will persist aloft through mid week. A shortwave and associated wave of low pressure continues to be modeled to pass well to our south Tuesday into Tuesday night. NBM indicates just a slight chance late Tuesday/Tuesday evening for extreme southern portions of the forecast area as the northern edge of the precipitation field grazes those areas. Though most areas, even those that have a slight chance for rain, will be mainly dry. High pressure builds in at the surface from the west on Wednesday as upper level ridging from the Great Lakes region approaches. Model solutions differ with amplitude and actual location due to differences in the location of the low over the Canadian Maritimes. A warm front may then approach the area from Wednesday night into Thursday, bringing the next chance for precipitation. It may be cold enough late Wednesday night for some snow showers for areas well inland. NBM was closely followed due to uncertainty from Wednesday onward. Marine SCA (Small Craft Advisory) conditions will continue through early this evening. Winds should start subsiding below 25 kt on the non-ocean waters tonight, but are likely to remain 25-30 kt on the ocean through Friday. Ocean seas gradually subside through Friday with sub-SCA conditions expected on all waters by Friday night. A period of sub-SCA (Small Craft Advisory) conditions are expected on Saturday. SCA (Small Craft Advisory) conditions then return late Saturday into Sunday with the next frontal system. Gales are possible on the waters Sunday afternoon behind the passage of a cold front, with this threat continuing into Monday with a tight pressure gradient. Will continue the mention for gales in the HWO. Waves build to 5 to 12 ft on the ocean by Sunday night and 4 to 7 ft on the sound, before starting to subside late Sunday night. Waves over the entire sound may not drop below 5 ft until late in the day Monday into Monday night, while the ocean waters remain above 5 ft through late Monday night into early Tuesday morning. Hydrology There are no hydrologic concerns through early next week. NOAA New York NY Office: Watches - Warnings - Advisories CT...None. NY...None. NJ...None. Marine Small Craft Advisory until 1am EST Friday for ANZ331-332-340- 345. Small Craft Advisory until 6pm EST this evening for ANZ335- 338. Small Craft Advisory until 6pm EST Friday for ANZ350-353-355. |
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