Cape Cod Bay Alt Marine Forecast
| Rest Of Tonight...Sw Winds Around 10 Kt. Seas Around 2 Ft. Patchy Fog. Vsby 1 To 3 Nm. |
| Wed...W Winds 5 To 10 Kt, Becoming Se In The Afternoon. Seas 1 Foot Or Less, Then Around 2 Ft In The Afternoon. Patchy Fog In The Morning With Vsby 1 Nm Or Less. |
| Wed Night...Sw Winds 5 To 10 Kt, Becoming W After Midnight. Seas Around 2 Ft In The Evening, Then 1 Foot Or Less. Patchy Fog. A Chance Of Showers. A Chance Of Tstms In The Evening. Vsby 1 To 3 Nm After Midnight. |
| Thu...Sw Winds 5 To 10 Kt, Becoming S In The Afternoon. Seas 1 Foot Or Less, Then Around 2 Ft In The Afternoon. Patchy Fog In The Morning. A Chance Of Showers In The Morning. |
| Thu Night...Sw Winds 5 To 10 Kt. Seas Around 2 Ft In The Evening, Then 1 Foot Or Less. |
| Fri...Sw Winds 5 To 10 Kt, Becoming Ne In The Afternoon. Seas 1 Foot Or Less. A Chance Of Showers In The Afternoon. |
| Fri Night...Ne Winds 5 To 10 Kt. Seas 1 Foot Or Less. A Chance Of Showers In The Evening. |
| Sat And Sat Night...Ne Winds 5 To 10 Kt, Becoming E. Seas 1 Foot Or Less, Then Around 2 Ft. |
| Sun...S Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas Around 2 Ft. A Chance Of Showers. |
| Sun Night...W Winds 15 To 20 Kt. Seas 2 To 3 Ft. Showers Likely. Winds And Seas Higher In And Near Tstms. 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 328am EDT Wednesday April 15 2026 .WHAT HAS CHANGED... Updated marine section. General forecast trends remain consistent. .KEY MESSAGES... - Summer-like warmth continues today away from the coast while a backdoor front brings cooler temperatures to parts of eastern MA. - Showers and storms possible again this afternoon and evening. - Milder temperatures in western MA/CT, cooler in eastern MA/RI Thursday-Saturday. Periods of showers and storms Friday. - Strong cold front Sunday ushers in cooler temperatures for early next week. KEY MESSAGE 1...Summer-like warmth continues today away from the coast while a backdoor front brings cooler temperatures to parts of eastern MA. The unseasonably warm airmass continues to sit over southern New England today, with 925 mb temperatures ranging from 15C to as high as 21C over CT. Generally, highs once again will likely reach the low to mid 80s over parts of the interior, particularly western MA into CT. For eastern MA and possibly even SE MA though, a backdoor front is expected to move into the region sometime this afternoon, keeping highs near the coast in the 60s with spots on the Cape and far NE MA only in the upper 50s. Cloud cover is also expected to be persistent closer to the coasts, with generally partly cloudy skies further into the interior. The greatest uncertainty with today's temperatures lies with how far inland the backdoor front might push today. There is a chance that more inland parts of SE MA into RI may reach the low 80s today if the front moves in later in the afternoon, but if it ends up being more progressive earlier in the afternoon, highs may be capped moreso in the low 70s. The closer to the front itself, the more uncertainty there will be with temperatures. KEY MESSAGE 2...Showers and storms possible again this afternoon and evening. A weak shortwave approaches the region today as well, which will aid in the development of more showers and thunderstorms, particularly late afternoon and evening. Latest forecast soundings still have 0-6 km shear values greater than 40 knots, particularly in the RAP guidance. The latest HREF even has some members drawing out some helicity swaths around parts of western MA. MLCAPE values between 500-1100 J/kg around 4pm this evening out in western MA with the combination of the stronger shear and very little CIN would be favorable for thunderstorm development that could even turn severe, however, mid-level lapse rates are quite weak. Anything that develops in the afternoon/evening hours would likely be quite limited in coverage before becoming more concentrated over CT, RI, and the south coast heading into the overnight period. KEY MESSAGE 3...Milder temperatures in western MA/CT, cooler in eastern MA/RI Thursday-Saturday. Periods of showers and storms Friday. The unseasonably warm temperatures aloft persist heading into the latter half of the week, and another shortwave (which appears to be a bit more potent) approaches late Thursday night. With this disturbance moving through, more rain showers can be expected especially for Friday. The continued cloud cover then combined with the showery/stormy conditions should also limit temperatures to being more in the mid 60s to low 70s for much of the region, with mid 70s still possible out in the CT River Valley. Low pressure to the south of the region will also help usher in the return of onshore flow over southern New England Saturday, which will really moderate temperatures; highs for Saturday may only reach the mid 50s near the immediate eastern coastline and the 60s over the interior. 925 mb temperatures Saturday fall to around 10C with this pattern. The backdoor frontal boundary lingers in the area through this 3-day period as well, so temperatures may change significantly depending on how far south the front slides in Thursday-Saturday. KEY MESSAGE 4...Strong cold front Sunday ushers in cooler temperatures for early next week. Following this pattern, a strong cold front pushes through southern New England. This frontal passage may bring the risk for some thunderstorms Sunday, especially as the much colder airmass (925 mb temperatures down to around -5C) moves in, crashing into the much warmer one we've been seeing. Highs in the 40s and 50s can be expected post-frontal passage, starting off the week much cooler and notably drier. Marine Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Small Craft Advisory will drop off at 8am as seas continue to diminish. S winds today may occasionally gust to around 20 kt over the southern waters. Winds over the eastern waters will be more E. Winds remain below 10 kt tonight over the eastern waters, with the southern waters remaining below 15 kt. Seas remain between 2-4 ft today through tomorrow. Fog may persist this morning and possibly through the day today. Outlook /Thursday Night through Sunday/... Thursday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers. Friday: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers, slight chance of thunderstorms. Friday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers. Saturday: Winds less than 25 kt. Saturday Night: Winds less than 25 kt. Slight chance of rain showers. Sunday: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers. Climate Upcoming record highs: Wednesday 4/15 Boston 82 in 1896 Hartford 88 in 1941 Providence 82 in 1938 Worcester 85 in 1941 NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...None. RI...None. Marine Small Craft Advisory until 8am EDT this morning for ANZ255- 256. |
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