Boston Harbor Marine Forecast
| Tonight...E Winds 10 To 15 Kt With Gusts Up To 20 Kt, Diminishing To 5 To 10 Kt After Midnight. Waves Around 2 Ft This Evening, Then 1 Foot Or Less. Patchy Fog. A Slight Chance Of Showers This Evening, Then A Chance Of Showers After Midnight With Vsby 1 To 3 Nm. |
| Fri...Se Winds 5 To 10 Kt, Becoming S 10 To 15 Kt With Gusts Up To 20 Kt In The Afternoon. Waves 1 Foot Or Less, Then Around 2 Ft In The Afternoon. Patchy Fog. Vsby 1 Nm Or Less, Increasing To 1 To 3 Nm In The Afternoon. |
| Fri Night...Sw Winds 15 To 20 Kt, Becoming W 10 To 15 Kt After Midnight. Waves Around 2 Ft. Patchy Fog After Midnight. |
| Sat...N Winds 10 To 15 Kt, Becoming E In The Afternoon. Gusts Up To 25 Kt. Waves 2 To 3 Ft. Patchy Fog In The Morning. |
| Sat Night...E Winds 10 To 15 Kt. Gusts Up To 20 Kt In The Evening. Waves 2 To 3 Ft. Patchy Fog. A Chance Of Showers. |
| Sun...S Winds 15 To 20 Kt With Gusts Up To 25 Kt. Waves Around 2 Ft. A Chance Of Showers In The Morning, Then Showers In The Afternoon. Patchy Fog In The Morning. |
| Sun Night...W Winds 15 To 20 Kt. Waves Around 2 Ft. A Chance Of Showers In The Evening. |
| Mon Through Tue Night...Nw Winds 15 To 20 Kt. Waves Around 2 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 744pm EDT Thu April 2 2026 .WHAT HAS CHANGED... Public and marine forecasts remain on track. Updated aviation forecasts and added wind shear for tomorrow. .KEY MESSAGES... - Chilly and damp at times rest of today into Friday morning, then turning much milder & drier Friday PM, with highs in the 60s! - Backdoor cold front Sat brings falling temps into the 40s across eastern MA...while the CT Valley might reach 65-70+. - Southwest flow returns Sunday with highs into the 60s for many locales...but a period of widespread showers expected with a cold front. - Chilly temps for the first half of next week with mainly dry weather, but a brief period of rain/showers possible around Tue. KEY MESSAGE 1...Chilly and damp rest of today into Friday morning, then turning much milder & drier Friday PM, with highs in the low to mid 60s away from the south coast. 1040 mb high over southeast Quebec provides cool air damming across SNE today, tonight and into Friday morning. Thus, chilly temps with most locations remaining in the 30s, with a stiff NE wind making it feel colder. As for precip, spotty light rain/drizzle in the cool sector, may become more widespread late tonight/early Fri AM, as WAA (Warm Air Advection - the movement of warm air) aloft increases with front lifting north. Most locations remain above freezing, however the highest terrain may dip to around 32. Therefore, there could be some light spotty freezing rain/drizzle at elevations above 500 ft. However, given such marginal temps and not covering much real estate, not expecting much if any impacts. Hence, no headlines necessary. As the warm front lifts north toward morning, there could be some areas of dense fog late tonight and then impacting the early morning commute Friday. Boundary south of New England today/Thursday, lifts north as warm front Friday afternoon. Good model agreement, including hi res guidance, that warm sector overspreads the region during the afternoon, with increasing sunshine and highs warming into the low and mid 60s across northern portion of CT/RI/MA and into the greater Boston area. Could be late day (after 4-5 pm) high temps, as low clouds may take some time to burn off. However, southwest flow and strong April sunshine will win out eventually away from the south coast. Much cooler across southern RI into southeast MA, as low clouds may only lift to higher cloud bases and not completely burn off. This combined with SSW wind trajectory off the cold ocean, highs here may only climb into the 50s, upper 40s Cape and Islands. Still much milder than today. Also, it will turn breezy Fri afternoon, especially away from the south coast in the afternoon, as temps warming into the low and mid 60s, will mix down SW winds 15-25 mph. Precipitation...there could be some spotty light rain/drizzle in the morning as the warm front lifts north. Otherwise a dry afternoon. A cold front approaches from the west late in the day. There could be a few decaying showers exiting NYS that reach western MA/CT during the evening. Otherwise, dry weather prevails Friday evening and night. KEY MESSAGE 2...Backdoor cold front Sat brings falling temps into the 40s across eastern MA...while the CT Valley might reach 65-70+. Low pressure will lift northeastward across the Great Lakes as large Canadian high pressure drops into the Maritimes on Sat. This will result in a backdoor cold front pushing westward across the region during the day Sat. Timing is tricky at this point...but temps should fall into the 40s across eastern MA by or during Sat afternoon. In fact...not out of the question temps drop into the upper 30s near the immediate eastern MA coast. Meanwhile...parts of western MA/CT may reach 65-70+ with the later arrival of the front. Keep in mind...these temps will be significantly impacted by a 2-4 earlier/later passage of this front so changes may certainly be needed. Much of Sat may end up dry...but will have to watch for a few passing showers and perhaps some drizzle/fog behind the backdoor cold front. KEY MESSAGE 3...Southwest flow returns Sunday with highs into the 60s for many locales...but a period of widespread showers expected with a cold front. Low pressure lifts northeast across Quebec on Sunday with a cold front extending southward from it. The shallow cool inversion should mix out on Sunday ahead of the approaching cold front. This should allow highs to reach back into the 60s across many locations despite an abundance of clouds. We also expect a period of widespread showers on Sunday as this cold front crosses the region. While these showers should be progressive...modest southerly LLJ/PWAT (Precipitable Water) plume may result in brief downpours and even a rumble of thunder with the activity. KEY MESSAGE 4...Chilly temps for the first half of next week with mainly dry weather, but a brief period of rain/showers possible around Tue. Ensemble model guidance in very good agreement in an upper trough building across the northeast for the first half of next week. This will result in chilly and mainly dry weather...but a period of rain/snow showers possible around Tuesday with a shortwave/mid level trough crossing the region. Highs Mon/Tue/Wednesday mainly in the middle 40s to the lower 50s...but turning milder on Thu with southwest flow developing ahead of our next cold front. Marine Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. 2 PMHigh confidence through Friday night. 1040 mb high over southeast Quebec provides chilly ENE winds across the MA/RI waters Thu afternoon. As the high noses southward, gusty ENE winds slacken Thu evening and become SE overnight. Despite winds slackening, seas will take sometime to subside. Thus, SCAs (Small Craft Advisories) continue. Boundary south of New England Thursday, lifts north as a warm front Friday, accompanied by a wind shift to the SW at speeds 15-20 kt, gusting up to 25 kt at times. Before the frontal passage, areas of dense fog are possible along and ahead of the warm front late tonight into Friday morning. Improved vsby and drier weather Fri afternoon. Tranquil and dry weather Friday night, as a weak and decaying cold front approaches the waters from the NW. Outlook /Friday Night through Tuesday/... Saturday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of seas approaching 5 ft. Patchy fog. Saturday Night: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Seas up to 5 ft. Slight chance of rain showers, patchy fog. Sunday: Low risk for gale force winds with gusts up to 35 kt. Rough seas up to 11 ft. Rain showers likely. Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Chance of rain showers. Monday: Winds less than 25 kt. Local rough seas. Monday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Tuesday: Winds less than 25 kt. Slight chance of rain showers. NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...None. RI...None. Marine Small Craft Advisory until 8pm EDT this evening for ANZ231>234-251. Small Craft Advisory until 11pm EDT this evening for ANZ235- 237. Small Craft Advisory until 6am EDT Friday for ANZ250. Small Craft Advisory until 2am EDT Friday for ANZ254>256. |
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