Vineyard Sound Marine Forecast
| Rest Of Tonight...N Winds 5 To 10 Kt. Seas 2 To 3 Ft. Wave Detail: E 2 Ft At 7 Seconds And Nw 1 Foot At 5 Seconds. Patchy Fog. Snow With A Chance Of Rain. Vsby 1 Nm Or Less. |
| Mon...W Winds 15 To 20 Kt, Increasing To 25 To 30 Kt In The Afternoon. Seas 2 To 4 Ft, Building To 4 To 6 Ft In The Afternoon. Wave Detail: W 3 Ft At 4 Seconds And S 3 Ft At 8 Seconds, Becoming Sw 6 Ft At 6 Seconds And S 5 Ft At 9 Seconds. Patchy Fog In The Morning. A Chance Of Snow In The Morning With Vsby 1 To 3 Nm. |
| Mon Night...W Winds 25 To 30 Kt With Gusts Up To 40 Kt. Seas 5 To 7 Ft. Wave Detail: Sw 6 Ft At 6 Seconds And Sw 6 Ft At 9 Seconds. A Chance Of Light Freezing Spray After Midnight. |
| Tue...W Winds 25 To 30 Kt, Diminishing To 15 To 20 Kt In The Afternoon. Seas 4 To 6 Ft. Wave Detail: Sw 5 Ft At 7 Seconds And Sw 4 Ft At 8 Seconds. A Chance Of Light Freezing Spray In The Morning. |
| Tue Night...W Winds 15 To 20 Kt, Diminishing To 10 To 15 Kt After Midnight. Gusts Up To 25 Kt. Seas 3 To 5 Ft. Wave Detail: Sw 4 Ft At 7 Seconds And Se 1 Foot At 9 Seconds. |
| Wed...W Winds Around 10 Kt, Becoming Sw 15 To 20 Kt In The Afternoon. Gusts Up To 25 Kt. Seas 2 To 4 Ft. Wave Detail: Sw 3 Ft At 7 Seconds And Se 1 Foot At 9 Seconds. |
| Wed Night...Sw Winds 15 To 20 Kt With Gusts Up To 30 Kt. Seas 3 To 5 Ft. |
| Thu And Thu Night...W Winds 20 To 25 Kt. Seas 3 To 5 Ft. |
| Fri...W Winds 15 To 20 Kt. Seas 3 To 4 Ft. A Chance Of Light Freezing Spray. |
| Fri Night...W Winds 20 To 25 Kt. Seas 3 To 4 Ft. A Chance Of Light Freezing Spray. 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 1159pm EST Sunday Jan 18 2026 .WHAT HAS CHANGED... Despite marginal boundary layer temperatures, bands of moderate to heavy snow have developed across much of SE Massachusetts and the Cape. Snowfall reports in these areas indicate that around 1-3 inches of snow has already fallen with an additional 2-4 inches possible. Heaviest snow will continue through 06z before gradually tapering tomorrow morning. As a result, have opted to adjust snow totals to 4-6" with localized amounts up to 7 inches possible. .KEY MESSAGES... - Plowable snow tonight with total accumulations of 3-5" with localized 6" amounts possible across eastern MA/RI. Heaviest snow/worst of the travel conditions between 6 pm and 2 am. Snow ends from west to east between 3am and 9am Monday. - Arctic front delivers cold conditions Tuesday, with some moderation Wednesday and Thursday. Colder again next weekend. - Quick moving clipper late Wednesday into early Thursday brings the next chance for light precipitation. KEY MESSAGE 1...Plowable snow today-tonight with total accumulations of 2-6" with localized 7" amounts possible across eastern MA/RI. Heaviest snow/worst of the travel conditions between 5 pm and 1 am...but snow showers may linger for the Monday am commute. An elongated shortwave trough stretching from the northern Great Lakes down into the Gulf Coast will spin up a coastal low offshore, passing just southeast of the benchmark this evening. Guidance held steady, with total Quantitative Precipitation Forecast across the region ranging from 1/2 to 3/4 inches, south and east of the I-95 corridor, including the Cape and Islands. Quantitative Precipitation Forecast ticked up a bit north and west of the I-95 corridor all the way to the northern Berkshires with 1/4 to 1/2 inch of Quantitative Precipitation Forecast. How this translates into snowfall accumulation will depend heavily on temperatures and where mid-level forcing sets up. Temperatures during this event will be marginal, with inland areas staying near freezing and the Cape and Islands staying at or above freezing. With the best mid-level forcing near the Cape and Islands, we will likely see snow at temperatures up to 36F as snow rates will be able to overcome the warm temps. The primary source of uncertainty is the temperature at which snow will accumulate on paved surfaces. Because of the warm temps, we continued to trend total accumulations down to 0.5-1.5 inches for the outer Cape and the Islands; however, if temps cool below freezing, snow accumulations could exceed 2-4. The highest confidence in snow accumulations remains along the I-95 corridor in eastern MA and into RI, where good mid-level forcing and temperatures near or below freezing will overlap. Snow accumulations in this area will range from 3-5 inches, with localized spots up to 6 inches possible. To the north and west of the I-95 corridor, mid-level forcing begins to drop off; however, cooler temperatures will allow snow ratios to be higher, ranging between 12-1 to 16-1. Snow totals north and west of the I-95 corridor, including all of CT, will range from 2-4 inches, with localized areas of 5 inches. After the lull in snowfall this afternoon, steady light snow will begin to overspread the region once again through 6 pm. Snow rates will start to tick up after 6 pm, increasing to 0.5 to 1.5 inches per hour. Snow becomes light again after 2-4 am and tapers off from west to east through 6-9 am this morning. Snow showers may linger over eastern MA until noon, but additional accumulations will be light. The most difficult travel period will be between 6 pm and 2 am tonight. However, with lingering snow showers into Monday morning, theam commute will likely be impacted. Low temperatures on Monday morning are expected to drop into the low to mid-20s across the region, which could cause any standing water from melting snow to refreeze, especially on untreated surfaces. High temperatures Monday afternoon rebound into the low to mid 30s, allowing some melting. Winds become gusty out of the WSW Monday afternoon at 15-20mph, making it feel like the low to mid 20s. KEY MESSAGE 2...Arctic front relievers cold conditions Tuesday, with some moderation Wednesday and Thursday. Colder again next weekend. A potent Arctic cold front crosses the region Monday night into Tuesday, ushering in much colder temperatures and gusty winds. 925mb temperatures fall to around -15C, with steep low-level lapse rates approaching 10C/km, supporting efficient boundary-layer mixing and transport of stronger winds to the surface. Gusts on Tuesday range from 25 to 35 mph, with a few gusts near 40 mph possible across the higher terrain. Combined with high temperatures in the teens and 20s, wind chills fall into the single digits to lower teens Tuesday afternoon, then into the 0F to -10F range Tuesday night. While cold, conditions are expected to fall shy of a Cold Weather Advisory. This Arctic intrusion is short-lived, with moderating temperatures Wednesday afternoon into the upper 20s to lower 30s, followed by mid 30s to lower 40s on Thursday. Global guidance suggests another Arctic air mass may arrives next weekend, with highs returning to the single digits. KEY MESSAGE 3...Quick moving clipper late Wednesday into early Thursday brings the next chance for light precipitation. The next chance for precipitation arrives midweek, though confidence remains low. Synoptic pattern features a mid-level low over Hudson Bay with embedded shortwave energy rotating around the cyclonic flow, supporting the potential development of a weak Alberta clipper tracking southeast from the Canadian Rockies. As typical with clippers, moisture limited. While temperatures Wednesday afternoon may be marginal the system could pass during the evening or overnight as temperatures fall below freezing, introducing the potential for light snow accumulations. With little downstream blocking, the system is expected to be progressive. Ensembles guidance remains unimpressive, with probabilities for snowfall exceeding one inch generally in the 10-20% range across interior southern New England. While near the coast, temperatures could be warm enough for light rain showers with southwest flow. Marine Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Through Tuesday...High Confidence. * Gale Warning for all waters except Narragansett Bay and Boston Harbor Monday evening through Tuesday morning. Tonight through Monday night... High confidence in trends, moderate confidence in Gale Watch. Departing low pressure brings a period of increasing west winds with seas building 5-8 feet today, with up to 10 feet across the southern outer waters. Westerly winds increase during the late afternoon into early evening. A strong Arctic cold front crosses the waters overnight into early Tuesday, bringing westerly gales. Increasing cold air advection may also result in freezing spray across all waters late tonight into Tuesday morning. The theme Tuesday will be gradually decreasing seas as broad high pressure approaches from the southwest. Seas will likely remain between 5 and 7 feet through much of the day. Outlook /Tuesday through Friday/... Tuesday: Strong winds with gusts up to 35 kt. Areas of rough seas. Freezing spray. Tuesday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Local rough seas. Freezing spray. Wednesday: Winds less than 25 kt. Seas locally approaching 5 ft. Wednesday Night through Thursday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Chance of rain. Thursday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas. Chance of freezing spray, slight chance of rain, slight chance of snow. Friday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of seas approaching 5 ft. Chance of freezing spray. NOAA Boston MA Office: Watches - Warnings - Advisories CT...Winter Weather Advisory until 7am EST Monday for CTZ002>004. MA...Winter Weather Advisory until 7am EST Monday for MAZ002>023- 026. RI...Winter Weather Advisory until 7am EST Monday for RIZ001>007. Marine Gale Watch from Monday afternoon through Tuesday morning for ANZ230>234-236-251. Gale Watch from Monday afternoon through Tuesday morning for ANZ235-237. Gale Watch from 10am EST Monday through Tuesday morning for ANZ250-254>256. |
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