East of Ipswich Bay and the Stellwagen Bank Marine Sanctuary Marine Forecast
| Tonight...Sw Winds 15 To 20 Kt, Diminishing To 10 To 15 Kt After Midnight. Gusts Up To 30 Kt. Seas 2 To 4 Ft. Wave Detail: Sw 3 Ft At 5 Seconds And Se 1 Foot At 9 Seconds. |
| Wed...W Winds 5 To 10 Kt. Gusts Up To 20 Kt In The Morning. Seas 2 To 3 Ft. Wave Detail: W 2 Ft At 4 Seconds And Se 1 Foot At 9 Seconds. |
| Wed Night...W Winds 5 To 10 Kt. Seas Around 2 Ft. Wave Detail: W 2 Ft At 4 Seconds And Se 1 Foot At 10 Seconds. |
| Thu...W Winds 5 To 10 Kt, Becoming Sw With Gusts Up To 20 Kt In The Afternoon. Seas Around 2 Ft. Wave Detail: W 2 Ft At 4 Seconds And E 1 Foot At 11 Seconds. |
| Thu Night...W Winds 10 To 15 Kt With Gusts Up To 20 Kt, Becoming Nw 5 To 10 Kt After Midnight. Seas Around 2 Ft. Wave Detail: W 2 Ft At 4 Seconds And Se 1 Foot At 11 Seconds. |
| Fri And Fri Night...Sw Winds 5 To 10 Kt. Seas Around 2 Ft. Wave Detail: Nw 2 Ft At 4 Seconds And E 1 Foot At 11 Seconds. |
| Sat...S Winds 5 To 10 Kt With Gusts Up To 20 Kt. Seas Around 2 Ft. A Chance Of Showers. |
| Sat Night...S Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas Around 2 Ft. Showers Likely With A Chance Of Tstms. |
| Sun...W Winds 5 To 10 Kt. Seas 2 To 3 Ft. Showers Likely. |
| Sun Night...W Winds 5 To 10 Kt. Seas 2 To 3 Ft. 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 359pm EDT Tuesday July 14 2026 .WHAT HAS CHANGED... Added western Hampden County to the Heat Advisory, and issued rip current statements for south-facing beaches today through Wednesday with potential for dangerous rip currents and surf. .KEY MESSAGES... - Hazy, hot and humid Wednesday. - Strong thunderstorms possible late tonight into Wednesday. - Dangerous rip currents and surf expected on south-facing beaches through Wednesday. - Seasonable temperatures with less humidity for the second half of the week, though unsettled conditions with chances for showers and thunderstorms remain possible into this weekend. KEY MESSAGE 1...Hazy, hot and humid Wednesday. Tweaked the Heat Advisory headlines today due to a layer of smoke aloft. This has been fairly opaque today, resulting in lower temperatures this afternoon. Even more smoke is projected for tomorrow, lowering confidence in reaching the Heat Advisory threshold for most of MA. That said, most people will still consider conditions to be at least warm and humid. Further adjustments may be needed with later forecasts. KEY MESSAGE 2...Strong thunderstorms possible late tonight into Wednesday. Strong convection over southeast Canada and northern New England may dive south into our region late tonight into Wednesday. Widely different answers in location and timing amongst the convection-allowing models. Most keep showers and thunderstorms out of southern New England. However, still thinking elevated CAPE values of 1,000-1,500 J/kg are possible late tonight into Wednesday. While this is likely not enough to result in severe weather, cannot completely dismiss the idea of a few thunderstorms, especially across northern MA. KEY MESSAGE 3...Dangerous rip currents and surf expected on south- facing beaches through Wednesday. SW breezes expected today and again on Wednesday will build wave heigheights into tonight to around 5-8 ft on the outer waters, then start to lower into the 4-6 ft range for Wednesday, but becoming longer in period. This poses a risk for dangerous rip currents and higher surf, and though it's often bullish in its output, it is supported by NWPS high probabilities for rip currents. For that reason we've hoisted a Rip Current Statement through early evening Wednesday for the southern coastline, with those areas with south/southwest facing exposures most at-risk. There should be fewer numbers of people at beaches at night but since the waves look to be higher tonight, opted to not get cute with the timing. the wave periods are on the shorter side today which could reduce wave energy to an extent, as it's often the longer period waves which cause the biggest risk for rip currents. Swim near vicinity of lifeguards and stay off jetties. KEY MESSAGE 4...Seasonable temperatures with less humidity for the second half of the week, though unsettled conditions with chances for showers and thunderstorms remain possible into this weekend. The upper level ridge that has been dominating the pattern for much of this week will start to slide more SE of the region for the second half of the week as an upper level trough with broad cyclonic flow to our north takes hold. A cold front passes through the region late Wednesday into early Thursday morning, which will help usher in more seasonable temperatures for the back half of the week. 925 mb temperatures fall to generally around 18-20C, which will be more supportive of high temperatures in the 80s. Thursday may be slightly warmer compared to later days due to breezy westerly winds and resultant downsloping, but drier air overall and lower temperatures aloft (as mentioned above) may only push highs into the low 90s. After that, expect 80s to persist into the start of next week. Latest guidance is hinting at the possibility for a ripple in the NW flow aloft later in the week that could lead to more unsettled conditions. Guidance is also indicating a shift to more southerly flow for the weekend and a surge in PWAT (Precipitable Water) values as a result. A surface low approaches from the west Saturday and with more of a NE track as currently indicated, its fronts would likely drag through the region and increase the risk for showers and thunderstorms through the weekend. Exact timing is still quite uncertain this far out, but ensembles and deterministic guidance suites remain favorable for a wetter end to the week, both on Saturday and Sunday. Marine Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Through Wednesday Night: High confidence. SCAs (Small Craft Advisories) take effect today and were extended into Wednesday. SW winds increase today to around 25-30 kt, with low prob of gusts to gale force near the Cape and Islands today into tonight, with seas building to 6-8 ft offshore by tonight. Seas then slowly ease into Wednesday but should still be in the SCA (Small Craft Advisory) range for Wednesday. Potential for thunderstorms on the northern waters as soon as overnight tonight into early Wednesday morning, with lesser risk for thunderstorms on the southern waters Wednesday aftn/night. Outlook /Thursday through Sunday/... Thursday: Winds less than 25 kt. Seas locally approaching 5 ft. Thursday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Friday: Winds less than 25 kt. Friday Night: Winds less than 25 kt. Slight chance of rain showers. Saturday: Winds less than 25 kt. Chance of rain showers, slight chance of thunderstorms. Saturday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Rain showers likely, chance of thunderstorms. Sunday: Winds less than 25 kt. Areas of rough seas. Chance of rain showers. NOAA Boston MA Office: Watches - Warnings - Advisories CT... Heat Advisory until 8pm EDT Wednesday for CTZ002>004. MA... Heat Advisory until 8pm EDT Wednesday for MAZ017>021. Air Quality Alert until 11pm EDT this evening for MAZ017>024. High Risk for Rip Currents through Wednesday evening for MAZ020>024. RI... Heat Advisory until 8pm EDT Wednesday for RIZ001>007. Air Quality Alert until 11pm EDT this evening for RIZ001>008. High Risk for Rip Currents through Wednesday evening for RIZ006>008. Marine Small Craft Advisory until 11pm EDT this evening for ANZ230- 231-250-251. Small Craft Advisory until 8pm EDT Wednesday for ANZ232>235- 237-254>256. Small Craft Advisory until 11pm EDT this evening for ANZ236. |
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