Provincetown MA to Chatham MA to Nantucket MA out 20 NM Marine Forecast
| Overnight...Sw Winds 5 To 10 Kt. Seas Around 2 Ft. Wave Detail: Se 2 Ft At 8 Seconds And Sw 1 Foot At 4 Seconds. |
| Thu...Sw Winds 10 To 15 Kt. Gusts Up To 20 Kt In The Afternoon. Seas 2 To 3 Ft. Wave Detail: Sw 2 Ft At 3 Seconds And Ne 1 Foot At 5 Seconds. |
| Thu Night...Sw Winds Around 15 Kt With Gusts Up To 20 Kt. Seas 2 To 3 Ft. Wave Detail: Sw 3 Ft At 4 Seconds And E 1 Foot At 7 Seconds. |
| Fri...W Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 2 To 3 Ft. Wave Detail: W 3 Ft At 4 Seconds And Se 1 Foot At 4 Seconds. |
| Fri Night And Sat...N Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 2 To 4 Ft. Wave Detail: N 4 Ft At 5 Seconds And Se 1 Foot At 8 Seconds. |
| Sat Night...Nw Winds 5 To 10 Kt, Diminishing To Around 5 Kt After Midnight. Seas 2 To 3 Ft. Wave Detail: Nw 3 Ft At 6 Seconds And Se 1 Foot At 8 Seconds. |
| Sun Through Mon Night...W Winds 5 To 10 Kt. Seas 2 To 3 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 732pm EDT Wednesday Oct 28 2026 .WHAT HAS CHANGED... No significant changes to the forecast. .KEY MESSAGES... - Dry, pleasant weather continues through the work week as temperatures increase. - High pressure likely to maintain dry weather through at least Monday. A slight risk for some showers Tuesday into Wednesday, but the details are not yet certain. KEY MESSAGE 1...Dry, pleasant weather continues through the work week as temperatures increase. Large high pressure continues to be the primary driver of the pleasant days and cool nigheights through Thursday. Expecting another night of radiational cooling dropping temperatures; however, party cloudy skies heading into the overnight hours will likely hinder the cooling effect... expecting temperatures to remain in the upper 30s to low 40s. Southern New England will see warmer temperatures Thursday and Friday as a surge of warm air advection ahead of a cold front warms 925 mb temperatures to between +11 and +15C... highs Thursday in the low to mid 60s, upper 60s for the Merrimack and Connecticut River Valleys, and highs Friday near 70 for the southern and eastern coastal plains (mid 60s for the interior and Cape/Islands). As the cold front approaches Friday, winds are likely to be gustier than we've seen the last several days...likely 20 to 25 mph at times, possibly 30 to 35 mph in the higher elevations. Post-FROPA Friday night, skies clear and winds calm for another night of radiational cooling. Temperatures will once again drop into the low to mid 30s for most. KEY MESSAGE 2...High pressure likely to maintain dry weather through at least Monday. A slight risk for some showers Tuesday into Wednesday, but the details are not yet certain. The dominant high pressure should finally move off the coast Sunday night into Monday. Even then, its influence is expected to slowly diminish into the middle of next week. There are rather large discrepancies in the evolution of a mid level ridge across the central USA early next week. The magnitude and orientation of this ridge will be the determining factor for the track of a low pressure trying to move east from the Rockies. at this time, thinking this low pressure will struggle to move east quickly. That leaves the positioning of its associated fronts to consider. With the low pressure quite a ways away from southern New England, there will not be much push to move them much as well. Overall, the most likely outcome is that dry weather prevails. However, a quasi-warm front may get close enough to our region Tuesday into Wednesday to perhaps trigger a few showers. Not seeing much moisture to work with, so any precipitation would be light. Marine Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Through Thursday Night...High confidence. Light winds and seas 1-3 ft continue as high pressure persists across the coastal waters. High pressure slowly pulls away Thursday with increasing SW winds to between 15 and 20 kts. Marginal SCA (Small Craft Advisory) conditions possible across the eastern near coastal waters Thursday afternoon then spreads to the southern waters Thursday night. Outlook /Friday through Monday/... Friday: Winds less than 25 kt. Areas of seas approaching 5 ft. Friday Night: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Seas up to 5 ft. Saturday: Winds less than 25 kt. Areas of seas approaching 5 ft. Saturday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Sunday through Monday: Winds less than 25 kt. NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...None. RI...None. Marine None. |
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