Nantucket Sound Marine Forecast
| This Afternoon...Sw Winds 10 To 15 Kt. Gusts Up To 20 Kt. Seas 2 To 3 Ft. Wave Detail: Sw 2 Ft At 4 Seconds And Se 1 Foot At 8 Seconds. |
| Tonight...Sw Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 2 To 4 Ft. Wave Detail: Sw 4 Ft At 5 Seconds And Se 1 Foot At 9 Seconds. |
| Wed...Sw Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 2 To 4 Ft. Wave Detail: Sw 4 Ft At 5 Seconds And S 1 Foot At 11 Seconds. |
| Wed Night...S Winds 10 To 15 Kt. Seas 2 To 3 Ft. Wave Detail: Sw 2 Ft At 6 Seconds And Se 1 Foot At 12 Seconds. A Chance Of Showers. |
| Thu...Sw Winds 10 To 15 Kt, Becoming W 15 To 20 Kt In The Afternoon. Gusts Up To 30 Kt. Seas 2 To 4 Ft. Wave Detail: Sw 3 Ft At 4 Seconds And Se 2 Ft At 9 Seconds. A Chance Of Showers In The Morning. |
| Thu Night...W Winds 15 To 20 Kt With Gusts Up To 30 Kt. Seas 3 To 5 Ft. Wave Detail: W 3 Ft At 4 Seconds And Se 1 Foot At 9 Seconds. Light Freezing Spray. |
| Fri...W Winds 15 To 20 Kt With Gusts Up To 30 Kt. Seas 3 To 5 Ft. Light Freezing Spray. |
| Fri Night...Sw Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 3 To 5 Ft. |
| Sat...Sw Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 3 To 5 Ft. A Chance Of Showers. |
| Sat Night...Sw Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 2 To 3 Ft. A Chance Of Showers. 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 605am EST Tuesday Jan 13 2026 .WHAT HAS CHANGED... No significant changes have been made to the forecast. Some interior rain showers very late tonight, but any snow showers confined to the very highest terrain. Relatively mild temperatures today and especially Wednesday with sharply colder weather arriving later Thursday into Friday behind a strong cold front. While a significant storm appears unlikely Saturday night into Sunday...a bit of snow is certainly possible. .KEY MESSAGES... - Overall quiet weather today, followed by a period of showers late tonight across interior southern New England with some snow showers confined to the very highest terrain. - Mild weather Wednesday into Wednesday night with a few rain showers perhaps ending as a brief period of light snow showers early Thu across the interior. Highs Wednesday in the 40s to near 50. - Turning colder Thu with falling daytime temps. Dry & cold Thu night-Fri. Lows Thu night in the upper single digits & teens with highs Fri mainly in the upper 20s and lower 30s. - Milder high temps into the 40s Sat with perhaps a bit of snow sometime Sat night-Sun...but a significant storm is unlikely. KEY MESSAGE 1...Overall quiet weather today, followed by a period of showers late tonight across interior southern New England with some snow showers confined to the very highest terrain. A series of shortwaves quickly move from west to east tonight along zonal flow. First disturbance passes with little impacts outside of an increase in mid and high level clouds this morning across northern MA. Milder day follows as a transient ridge axis develops over New England. Latest guidance still shows a milder day on tap as 925mb temps climb to 0- 2C. A more amplified shortwave digs over the Great Lakes later Tuesday into Tuesday night. First sign of its approach will be increasing mid and high level clouds later today. Should see a broken band of precipitation pass through the CWA (County Warning Area) with the higher POPs located across northern Massachusetts. Much of the forcing with this shortwave will be confined to Northern New England and so shower activity will be limited in coverage and intensity. May also see a few flakes mix in across the higher terrain but accumulations if any will be light with marginal temperatures and modest Quantitative Precipitation Forecast. KEY MESSAGE 2...Mild weather Wednesday into Wednesday night with a few rain showers perhaps ending as a brief period of light snow showers early Thu across the interior. Highs Wednesday in the 40s to near 50. An amplifying shortwave trough moves across the Great Lakes and into northern New England Wednesday into early Thu. Out ahead of this cold front/amplifying shortwave trough...southerly flow will result in unseasonably mild temperatures. Despite considerable clouds...high temps will be well into the 40s to near 50 in a few spots. These readings are a solid 10+ degrees above normal for mid January standards. Given the bulk of the dynamics passing to our north...not expecting a lot of precipitation and much of this time will feature dry weather. Nonetheless...a few showers will be possible at times Wednesday into Wednesday night with the focus for them across interior southern New England closer to the shortwave energy. As colder air begins to work in from the west...may see precipitation end as a brief period of light snow showers across interior southern New England early Thu morning. Any snow accumulations should be a dusting to generally less than 1 inch. KEY MESSAGE 3...Turning colder Thu with falling daytime temps. Dry & cold Thu night-Fri. Lows Thu night in the upper single digits & teens with highs Fri mainly in the upper 20s and lower 30s. Low pressure will rapidly intensifies Thu into Thu night as it tracks northeast from northern new England into the Canadian Maritimes. The result will be a shot of much colder air working into southern new England Thu into Fri. Temps on Thu will likely fall during the afternoon into the upper 20s and 30s on a stiff gusty west wind. Low temps Thu night will drop into the upper single digits and teens. Wind chills will drop to between 5 below and 10 above by daybreak Fri. High temps on Fri will only recover into the upper 20s and lower 30s. High pressure building in from the west will keep our weather dry...despite the cold temperatures. KEY MESSAGE 4...Milder high temps into the 40s Sat with perhaps a bit of snow sometime Sat night-Sun...but a significant storm is unlikely. High pressure quickly moves east of the mid-Atlantic coast to start the weekend as another trough gets carved out across the Great Lakes. This allows for a quick rebound in temperatures with highs mainly in the 40s on Sat. The forecast then becomes quite complex Sat night into Sunday with an amplifying trough to our west with several pieces of shortwave energy. The problem is that the guidance is struggling on which piece of energy to amplify and where the actual surface low develops. Latest guidance tends to develop the main surface low too far north and late for a significant storm. That being said...there are a few pieces of guidance including the CMC/ICON that have a wave of low pressure further south with the potential for an inverted trough setup. So while a significant storm appears unlikely...given the amount of shortwave energy to our west we can not rule out period of snow sometime Sat night into Sunday if an inverted trough sets up. Whether or not this happens remains to be seen...but it is something to watch in the coming days. Marine Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Today and tonight...High Confidence. Winds have diminished this morning...but lingering marginal 5 foot seas will persist across the southern waters before diminishing this afternoon. Modest southwest LLJ develops tonight with another period of 25-30 kt gusts expected. SCA (Small Craft Advisory) conditions hoisted tonight for most waters. Outlook /Tonight through Saturday/... Wednesday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas. Wednesday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers. Thursday: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of seas approaching 5 ft. Chance of rain showers. Thursday Night: Low risk for gale force winds with gusts up to 35 kt. Areas of rough seas. Freezing spray, slight chance of snow showers. Friday: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 10 ft. Freezing spray. Friday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 10 ft. Slight chance of rain showers, slight chance of snow showers. Saturday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Seas up to 5 ft. Slight chance of rain showers. NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...None. RI...None. Marine Small Craft Advisory from 7pm this evening to 11am EST Wednesday for ANZ231>235-237-250-251. Small Craft Advisory until 7pm EST Wednesday for ANZ254. Small Craft Advisory until 10pm EST Wednesday for ANZ255-256. |
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