Cape Cod Bay Marine Forecast
| This Afternoon...W Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 2 To 3 Ft. Wave Detail: W 2 Ft At 3 Seconds And Se 1 Foot At 10 Seconds. A Chance Of Showers. |
| Tonight...Nw Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas Around 3 Ft. Wave Detail: Nw 3 Ft At 5 Seconds And Se 1 Foot At 10 Seconds. |
| Fri...Nw Winds 15 To 20 Kt. Seas 2 To 3 Ft. Wave Detail: Nw 3 Ft At 5 Seconds And Ne 2 Ft At 8 Seconds. |
| Fri Night...Nw Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 2 To 3 Ft. Wave Detail: N 3 Ft At 6 Seconds. |
| Sat...Nw Winds 10 To 15 Kt. Gusts Up To 20 Kt In The Morning. Seas 2 To 3 Ft. Wave Detail: N 3 Ft At 6 Seconds. |
| Sat Night...Sw Winds 10 To 15 Kt, Increasing To 15 To 20 Kt With Gusts Up To 25 Kt After Midnight. Seas 2 To 3 Ft. Wave Detail: W 2 Ft At 4 Seconds And N 2 Ft At 7 Seconds. A Chance Of Rain In The Evening, Then Rain Likely After Midnight. |
| Sun...W Winds 20 To 25 Kt With Gusts Up To 30 Kt. Seas 3 To 4 Ft. Rain Likely. |
| Sun Night...W Winds 25 To 30 Kt With Gusts Up To 35 Kt. Seas 3 To 4 Ft. A Chance Of Showers. |
| Mon And Mon Night...W Winds 25 To 30 Kt, Diminishing To 20 To 25 Kt. Seas 3 To 4 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 600am EST Thu Nov 13 2025 Synopsis Mainly dry weather with below normal temperatures expected through Saturday. A frontal system will bring mainly rain Saturday night into early Sunday, drying out Sunday afternoon. Windy and cool conditions follow Sunday night and Monday then diminishing wind and continued dry weather into midweek as high pressure builds in from the west. Near Term - Until 6pm This Evening Key Messages: * A brief shower is possible today, otherwise mainly dry and cool A weak shortwave approaching from the west is generating a few showers across upstate NY which may spill into western MA through the morning. Otherwise, a more potent shortwave will dive SE from the Gt Lakes and pass mostly west and south of New England today. The shortwave will be accompanied by cooling temps aloft with 500 mb temps dropping to -30 to -32C this afternoon. Any sunshine to start the day will quickly give way to mainly cloudy skies as diurnal cu expands across the region. Moisture is limited but the cold pool(a region of relatively cold air) aloft may generate an isolated sprinkle or shower this afternoon. Best chance of showers will likely be confined to the south coast and Cape/Islands closest to the track of the shortwave. Highs will reach upper 40s across much of SNE, cooler higher terrain. The boundary layer is decently mixed but relatively shallow and supports W-NW wind gusts to 20-25 mph at times. Short Term - 6pm This Evening Through 6pm Friday Key Messages: * Clearing and cold tonight * Dry and cooler Friday Tonight... The shortwave moves to the east this evening and subsidence behind it will result in clearing skies for much of the region. Exception will be across the outer Cape where ocean effect clouds are expected to develop with perhaps an isolated shower. Modest NW breezes will limit radiational cooling, but still a cold night with lows dropping into the upper 20s and lower 30s. Friday... SNE will be in between shortwaves and dry air in the column will bring mostly sunny skies, but ocean effect clouds will likely linger over the outer Cape. Yet another shortwave rotating around the upper low to the NE will dive southward through New England later in the afternoon and evening with diurnal cu increasing during the afternoon. Temps will be a bit cooler as slight cooling noted at 925/850 mb. Highs will be mostly in the mid 40s with NW winds 10-20 mph. Long Term - Friday Night Through Wednesday Key Messages: * Dry and cool Sat * A frontal system will bring a period of rain Sat night into early Sunday which may begin as a brief period of freezing rain at the onset across higher elevations in northern MA * Drying out by Sunday afternoon and becoming blustery * Mainly dry Monday through Wed. Windy Monday with diminishing wind Tuesday & Wed Last of the shortwaves will eventually move east of New England Fri night with ridging moving in for Sat which will bring sunshine and lighter winds but below normal temps. Progressive pattern with next northern stream system moving in Sat night into Sun. Warm frontal overrunning precipitation is expected to overspread SNE Sat night. Ptype mainly rain as the column is warming, but surface temps may be near freezing at the precipitation onset over the Berkshires and Worcester Hills where brief freezing rain possible. But impacts should be minimal as any icing should be localized and brief. Cold front will be moving through SNE Sunday morning and high confidence in improving trend after the frontal passage but exact timing is uncertain. Gusty post-frontal winds develop, most likely in the afternoon, and highs should reach the 50s in the coastal plain. Windy and turning colder Sunday night and Mon. Winds will diminish Tuesday and especially Wednesday as high pressure builds in from the west. Below normal temps through midweek. Marine Forecaster Confidence Levels... Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. Shortwave passage will bring another surge of wind with W-NW gusts to 25-30 kt developing over open waters this afternoon into this evening. SCA (Small Craft Advisory) in effect for all waters except Boston Harbor and Narragansett Bay. Winds gradually drop off late tonight into Fri but still NW around 20 kt. Outlook /Friday Night through Monday/... Friday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers. Saturday: Winds less than 25 kt. Seas locally approaching 5 ft. Saturday Night: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Seas locally approaching 5 ft. Rain likely. Sunday: Strong winds with gusts up to 40 kt. Areas of rough seas. Rain likely. Sunday Night: gale force winds with gusts up to 45 kt. Rough seas up to 15 ft. Chance of rain showers. Monday: Moderate risk for gale force winds with gusts up to 40 kt. Rough seas up to 15 ft. Slight chance of rain showers. NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...None. RI...None. Marine Small Craft Advisory from 3pm this afternoon to 7am EST Friday for ANZ231-251. Small Craft Advisory until 10am EST Friday for ANZ232>235-237. Small Craft Advisory until 7am EST Friday for ANZ250. Small Craft Advisory until 4pm EST Friday for ANZ254>256. |
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