Cape Cod Bay Alt Marine Forecast
| Rest Of Tonight...W Winds 25 To 30 Kt. Seas 3 To 5 Ft. Wave Detail: W 5 Ft At 5 Seconds And S 1 Foot At 8 Seconds. |
| Mon...W Winds 25 To 30 Kt, Diminishing To 20 To 25 Kt In The Afternoon. Seas 3 To 5 Ft. Wave Detail: W 5 Ft At 5 Seconds And E 1 Foot At 13 Seconds. |
| Mon Night...W Winds 20 To 25 Kt With Gusts Up To 30 Kt. Seas 3 To 4 Ft. Wave Detail: Nw 4 Ft At 6 Seconds And E 1 Foot At 14 Seconds. |
| Tue...W Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 2 To 4 Ft. Wave Detail: W 4 Ft At 5 Seconds And E 1 Foot At 14 Seconds. |
| Tue Night Through Wed Night...N Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 2 To 3 Ft. Wave Detail: Nw 3 Ft At 4 Seconds And E 1 Foot At 13 Seconds. |
| Thu And Thu Night...Ne Winds Around 5 Kt. Seas 1 Foot Or Less. Wave Detail: N 1 Foot At 3 Seconds And E 1 Foot At 12 Seconds. |
| Fri...S Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas Around 2 Ft. A Chance Of Rain. |
| Fri Night...Sw Winds 15 To 20 Kt. Seas 2 To 3 Ft. Rain Likely. 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 1224am EST Monday Nov 17 2025 Synopsis Chilly and windy conditions continue through Monday and Tuesday with decreasing winds Wednesday and Thursday as high pressure settles in. Quick moving frontal system arrives Friday into the weekend bringing a period of unsettled weather. Near Term - Until 6am This Morning Key Messages: * Windy with falling temperatures through tonight Isolated showers continue to move over parts of the interior this afternoon and are expected to continue to do so through the rest of today. Mostly light rain is associated with these, with some snow showers possible towards the higher elevations (Berkshires, parts of the Worcester Hills). Not much is expected to accumulate, though; at most, a localized total of an inch or two towards the Berkshires. Gusty winds are expected to continue through the afternoon, primarily between 30 and 35 kts, with isolated and infrequent higher gusts possible towards the Berkshires. Temperatures continue to fall through the rest of the day and will dip into the 20s and low 30s overnight as 925 mb temperatures reach -4C. Latest guidance indicates 850 mb winds around 40 kts for much of the region overnight. Gusty westerly winds between 25-35 kts will likely continue into tonight even with the lack of diurnal mixing, leading to wind chill values in the teens and low 20s across southern New England. Short Term - 6am This Morning Through 6pm Tuesday Key Messages: * Breezy with below normal temperatures and a continued mix of sun and clouds The upper level low dominating the latest pattern will continue to move across New England Monday, shifting more NE heading into Tuesday morning. Temperatures at 925 mb improve to -2C during the day Monday; highs in the upper 30s and low 40s will be supported as a result. Gusty winds will once again be supported by good mixing up to 850 mb. As the trough moves into the Maritimes, surface low pressure moves off with it and high pressure continues to creep its way towards the region. The gradient between these two centers is expected to weaken very slightly going into Tuesday morning, so while breezy conditions are still expected going into Monday night, gusts should be more limited to around 25 kts over the higher elevations, Cape Cod, and the Islands (should be below 20 kts elsewhere). Dry conditions due to a lack of forcing and cooling aloft will continue through this period with a mix of sun and clouds. Lows Monday night are expected to once again settle into the 20s and low 30s. Long Term - Tuesday Night Through Sunday Key Messages: * Dry and blustery Tuesday with below normal temps * Less wind Wed-Thu but still cooler than normal * Unsettled weather with milder temps Fri-Sat Upper low continues to move northeast into the Maritimes into Tuesday. Overall the upper air pattern deamplifies into zonal flow midweek before another shortwave disturbance arrives by the weekend. Breezy conditions continue into Tuesday behind departing surface low. Much drier airmass with PWATs (Precipitable Waters) falling well below 0.5" Wed-Thu as high pressure moves into the region. Weak shortwave moves through Thu but global ensembles have continued to trend further south with the bulk of the precipitation. The pattern becomes a bit more complex this weekend as a pronounced northern stream dives south across the Great Lakes. Temps will remain below normal through Thu with highs mostly in the 40s, then milder conditions anticipated Fri and Sat. Marine Forecaster Confidence Levels... Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. Gale Warnings Continue into Monday and Monday Night. Gusts to 35-40 kt with sustained W winds from 20 to 35 kt are expected to continue into tonight and Monday after a cold front passed through this morning. Seas continue to build into tonight, peaking at 12-14 ft over the southern waters. Winds will remain gusty into part of tomorrow night as well as seas begin to decrease. Outlook /Tuesday Night through Friday/... Tuesday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas. Tuesday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Wednesday through Thursday: Winds less than 25 kt. Thursday Night: Winds less than 25 kt. Chance of rain. Friday: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain. NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...None. RI...None. Marine Gale Warning until 7am EST this morning for ANZ230-236. Gale Warning until 7pm EST this evening for ANZ231>235-237- 251. Gale Warning until 1am EST Tuesday for ANZ250-254>256. |
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