Montauk NY to Marthas Vineyard out 20 NM South of Block Island Marine Forecast
| Overnight...W Winds 10 To 15 Kt, Increasing To 15 To 20 Kt. Gusts Up To 25 Kt. Seas 4 To 5 Ft. Wave Detail: S 5 Ft At 9 Seconds And Sw 3 Ft At 4 Seconds. |
| Thu...W Winds 15 To 20 Kt, Increasing To 20 To 25 Kt In The Afternoon. Gusts Up To 35 Kt. Seas 5 To 7 Ft. Wave Detail: W 6 Ft At 6 Seconds And S 4 Ft At 9 Seconds. |
| Thu Night...Nw Winds 25 To 30 Kt, Diminishing To 20 To 25 Kt After Midnight. Gusts Up To 40 Kt. Seas 6 To 8 Ft, Subsiding To 4 To 6 Ft After Midnight. Wave Detail: Nw 7 Ft At 6 Seconds And Se 3 Ft At 10 Seconds, Becoming N 6 Ft At 6 Seconds And Se 2 Ft At 10 Seconds. |
| Fri...N Winds 10 To 15 Kt With Gusts Up To 20 Kt, Becoming Sw 5 To 10 Kt In The Afternoon. Seas 2 To 4 Ft. Wave Detail: N 3 Ft At 5 Seconds And Se 2 Ft At 9 Seconds. |
| Fri Night...S Winds 10 To 15 Kt, Becoming Se After Midnight. Seas 2 To 3 Ft. Wave Detail: Sw 2 Ft At 3 Seconds And Se 2 Ft At 9 Seconds. A Chance Of Showers. |
| Sat And Sat Night...Nw Winds Around 10 Kt. Seas 2 To 3 Ft. Wave Detail: S 2 Ft At 4 Seconds And Se 2 Ft At 9 Seconds. A Chance Of Showers. |
| Sun Through Mon...N Winds 20 To 25 Kt With Gusts Up To 30 Kt. Seas 2 To 4 Ft. |
| Mon Night...N Winds 20 To 25 Kt With Gusts Up To 30 Kt. Seas 3 To 5 Ft. Seas Are Reported As Significant Wave Height, Which Is The Average Of The Highest Third Of The Waves. Individual Wave Heights May Be More Than Twice The Significant Wave Height. |
| Area Forecast Discussion National Weather Service Boston/Norton MA 641pm EST Wednesday Dec 3 2025 Synopsis Dry and cold weather persists tonight. An arctic cold front crosses the region Thursday with a few snow showers and perhaps a localized heavier snow squall...followed by windy and bitterly cold temperatures Thursday night. The winds quickly diminish by Friday but it remains unseasonably cold. Scattered snow showers possibly mixing with rain showers may impact the region late Friday night into Saturday with a low pressure system passing well to our south. Another arctic cold front crosses the region Sunday followed by well below normal temperatures Sunday night into Tuesday. A low pressure system approaching from the west may bring some more rain/snow showers by Tuesday night and/or Wednesday. Near Term - Through Thursday Key Messages... * Dry & cold tonight with lows mainly in the upper teens and 20s Details... Tonight... A moisture starved shortwave will be crossing the region tonight. The atmosphere is too dry to support any precipitation...but we will see some mid level cloudiness working across the region. So dry and cold weather is on tap for tonight with low temps mainly in the upper teens and 20s with some lower 30s in the urban heat island of Boston. .SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY/... Key Messages... * Arctic cold front brings a few snow showers/gusty winds Thu with perhaps a brief localized snow squall or two...Highs 35 to 40 * Windy & bitterly cold Thu night...Lows mainly in the single digits to the middle teens with Wind Chills between 10 below & 10 above * Mostly sunny/light wind & unseasonably cold Fri...Highs 20s/near 30 Details... Thursday... An arctic cold front will be crossing the region Thursday afternoon. A mixture of clouds and sunshine ahead of this front should result in highs mainly between 35 and 40...which is still below normal for this time of year. As the front crosses the region...shortwave energy coupled with 0-2 KM ThetaE lapse dropping below zero along with a touch of MUCape are favorable for a few brief snow showers and perhaps a localized snow squall or two. The one thing we are lacking is low level moisture...so this may keep the snow squall threat rather localized but something we still need to watch. As this front crosses the region...NW winds will increase and expect gusts of 25-40 mph to develop by mid-late afternoon. Thursday night... A bitterly cold airmass will invade the region as 925T drop to between -15C and 18C...which is quite impressive for the first week of December! This will be accompanied by NW wind gusts of 25 to 40 mph in the evening...which should diminish later Thursday night. Low temps should bottom out mainly in the single digits to middle teens in most locations. In fact...if the winds diminish enough may even see a few sub-zero readings across the outlying locations of northwest MA with the snowpack in place. While we are not expecting the need for any Cold Weather Advisories...wind chills will drop to between 10 below and 10 above zero late Thursday night! Friday... Large high pressure builds into southern New England from the west on Friday. This will result in plenty of sunshine along with light winds but with unseasonably cold temperatures. Despite temps beginning to warm aloft...limited mixing and low December sun angle should keep highs in the 20s to near 30. These numbers are well below normal of this time of year. Long Term - Friday Night Through Wednesday Key Messages... * Scattered snow showers possible late Fri night-Sat perhaps even changing to rain showers near the I-95...snow accums look minor * Highs this weekend in the 30s to lower 40s...still below normal * Another shot of arctic air Sunday night into Tuesday with highs returning to well below normal mainly in the 20s to the lower 30s * Scattered snow showers possible Tuesday night-Wednesday perhaps mixing with or changing to rain showers Details... Friday night and Saturday... High pressure moves east of the region as a weak wave of low pressure tracks off the mid-Atlantic coast Fri night into Sat. Given the lack of amplitude in the upper level flow...this low pressure system will pass well to our south. Therefore...mainly just expecting the risk of scattered snow showers which may even change to rain showers near I-95 given lack of cold high in eastern Canada. Either way...snow accumulations should be on the minor side. The one fly in the ointment Fri night into Sat is the potential for an inverted trough to setup. This can sometimes result in a very narrow band of more significant precipitation. Low risk at this point...but something to watch in the late Friday night-Saturday time frame. Highs should be in the 30s to near 40 on Saturday...which is still below normal for this time of year. Sunday through Tuesday... Another arctic cold front will cross the region later Sunday into Sunday night. While high temperatures on Sunday should still reach the 30s to the lower 40s...it will be turning much colder Sunday night into Tuesday. Low temps should be mainly in the single digits and teens with highs mainly in the 20s to the lower 30s...which is well below for early December standards. Generally dry weather expected over this time outside perhaps a brief passing flurry/snow shower or two late Sunday with the arctic cold front. Tuesday night and Wednesday... Low pressure approaching from the west may bring another round of scattered snow showers sometime Tuesday night into Wed. Currently this does not look to be a significant storm and may even see enough warm air enter the picture for a change to rain showers in some locations. This all is certainly subject to change given the time range. Marine Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Tonight through Friday night...High confidence. * Gale Warnings Thu afternoon and night The main concern will be an arctic cold front that crosses the region on Thursday. This will bring NW wind gusts of 30 to 40 knots Thursday afternoon and night. This has prompted the issuance of Gale Warnings for our waters given excellent mixing given the amount of cold air crossing the relatively warm waters. High pressure quickly builds in from the west Fri allowing winds/seas to diminish significantly. Outlook /Friday Night through Monday/... Friday Night: Winds less than 25 kt. Chance of rain showers, slight chance of snow showers. Saturday: Winds less than 25 kt. Chance of rain showers. Saturday Night: Winds less than 25 kt. Slight chance of rain showers. Sunday: Winds less than 25 kt. Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Monday: Strong winds with gusts up to 30 kt. Seas locally approaching 5 ft. NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...None. RI...None. Marine Gale Watch from Thursday afternoon through late Thursday night for ANZ230-236. Gale Warning from 1pm Thursday to 4am EST Friday for ANZ231>235-237-250-251-254>256. |
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