Coastal Waters out 25 NM South of Marthas Vineyard and Nantucket Marine Forecast
| This Afternoon...Sw Winds 10 To 15 Kt. Gusts Up To 20 Kt. Seas 2 To 3 Ft. Wave Detail: Sw 3 Ft At 4 Seconds And E 2 Ft At 8 Seconds. |
| Tonight...Sw Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas Around 3 Ft. Wave Detail: Sw 3 Ft At 4 Seconds And Se 2 Ft At 10 Seconds. |
| Fri...Sw Winds 10 To 15 Kt. Seas 2 To 3 Ft. Wave Detail: Sw 2 Ft At 4 Seconds And Se 2 Ft At 8 Seconds. |
| Fri Night...Sw Winds 10 To 15 Kt. Seas 3 To 4 Ft. Wave Detail: Se 3 Ft At 10 Seconds And Sw 2 Ft At 4 Seconds. |
| Sat...Sw Winds 10 To 15 Kt, Increasing To 15 To 20 Kt In The Afternoon. Gusts Up To 25 Kt. Seas 3 To 5 Ft. Wave Detail: Sw 5 Ft At 5 Seconds And Se 3 Ft At 9 Seconds. |
| Sat Night...Sw Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 4 To 6 Ft. Wave Detail: Sw 6 Ft At 6 Seconds And E 3 Ft At 8 Seconds. Patchy Fog After Midnight. Showers Likely After Midnight. |
| Sun...W Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 4 To 5 Ft. Patchy Fog. Showers Likely. |
| Sun Night...Ne Winds 20 To 25 Kt. Seas 4 To 5 Ft. Patchy Fog. A Chance Of Showers. |
| Mon...Ne Winds 20 To 25 Kt With Gusts Up To 30 Kt. Seas 4 To 5 Ft. A Chance Of Showers. |
| Mon Night...N Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 3 To 5 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 650am EDT Thu Jun 4 2026 .WHAT HAS CHANGED... While no significant changes were made to the forecast, continue to refine summery temperatures and timing of precipitation for this coming weekend. .KEY MESSAGES... - Quiet and dry stretch of weather through Saturday, with unseasonably warm temperatures. - Showery activity becomes more likely late Saturday into Sunday with a frontal passage. - Drier and cooler conditions early next week. KEY MESSAGE 1...Quiet and dry stretch of weather through Saturday, with unseasonably warm temperatures. Confidence remains high in dry and unseasonably warm weather through the daylight hours Saturday as surface high pressure shifts from the Great Lakes toward the southeastern CONUS while mid-level ridging settles across the Northeast. Temperatures aloft continue to warm, with 850 mb temperatures rising to around +13C to +15C today and Friday, then +15C to +18C Saturday. Highs today should top out in the 80s for most, with the greatest potential for 90 degree temperatures across the Connecticut River and Merrimack Valleys where downsloping and deeper mixing are maximized. Friday and Saturday are expected to be the warmest days, with highs in the upper 80s to lower 90s becoming more widespread away from the immediate coast, where onshore flow should still provide some moderation. NBM probabilities continue to indicate a 70 to 80 percent chance of exceeding 90 degrees across the Connecticut River and Merrimack Valleys Friday afternoon, while much of the coastal plain away from the shoreline has a 50 to 60 percent chance. One caveat Saturday will be increasing cloud cover and a low risk for a late-day shower, mainly northwest of the I-91 corridor. KEY MESSAGE 2...Showery activity becomes more likely late Saturday into Sunday with a frontal passage. Confidence continues to increase that most, if not all, of the daylight hours Saturday remain dry, though a brief afternoon shower cannot be ruled out northwest of the I-91 corridor as a front approaches from northern New England. Given summerlike warmth and modest humidity (dewpoints near 60F), a limited risk for an isolated thunderstorm with locally heavy downpours exists Saturday afternoon, though confidence remains low and any activity should remain isolated. By Sunday, a more defined mid-level trough and associated shortwave energy become established over southern New England, supporting a better signal for scattered showers as weak surface low pressure develops along a weakening frontal boundary. Temperatures trend notably cooler, generally 10 to 15 degrees lower than Saturday, though exact values will depend on frontal timing. Eastern areas may cool more quickly with northeasterly flow off the Gulf of Maine, while interior locations such as Springfield and Hartford could remain relatively warmer. KEY MESSAGE 3...Drier and cooler conditions early next week. Conditions trend drier Monday into Tuesday as the weekend system gradually shifts east of New England. Some uncertainty remains regarding how quickly lingering troughing departs, which will influence temperatures and cloud cover early next week. For now, expect cooler conditions Monday with a gradual warming and drying trend by Tuesday. Marine Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Today through Friday High confidence. Winds and seas remain below SCA (Small Craft Advisory) criteria through Friday. SW winds increase to around 15-20 kt today, with occasional marginal SCA- level gusts near 25 kt across the Cape and Islands waters, including Buzzards Bay, Vineyard Sound, and Nantucket Sound, where stronger SW flow is favored through sunset. A similar setup may develop again Friday, though confidence is too low at this time to warrant an additional Small Craft Advisory. Seas remain 3 ft or less on all waters. Outlook /Friday Night through Monday/... Friday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Saturday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Seas up to 5 ft. Saturday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Seas up to 5 ft. Chance of rain showers, slight chance of thunderstorms, patchy fog. Sunday: Winds less than 25 kt. Local rough seas. Rain showers likely, slight chance of thunderstorms, patchy fog. Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Seas up to 5 ft. Chance of rain showers, patchy fog. Monday: Moderate risk for Small Craft Advisory winds with gusts up to 30 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 noon today to 9pm EDT this evening for ANZ232>234. |
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