East of Ipswich Bay and the Stellwagen Bank Marine Sanctuary Marine Forecast
| This Afternoon...E Winds 5 To 10 Kt. Seas 1 Foot Or Less, Then Around 2 Ft. Wave Detail: Nw 1 Foot At 2 Seconds And S 1 Foot At 3 Seconds, Becoming Nw 1 Foot At 2 Seconds And E 1 Foot At 3 Seconds. |
| Tonight...Se Winds 5 To 10 Kt. Seas Around 2 Ft. Wave Detail: Se 2 Ft At 9 Seconds And E 1 Foot At 3 Seconds. |
| Sun...Se Winds 10 To 15 Kt, Increasing To 15 To 20 Kt In The Afternoon. Gusts Up To 25 Kt. Seas 2 To 4 Ft. Wave Detail: Se 3 Ft At 5 Seconds. A Chance Of Rain In The Morning, Then Rain In The Afternoon. Patchy Fog In The Afternoon With Vsby 1 To 3 Nm. |
| Sun Night...Se Winds 15 To 20 Kt With Gusts Up To 30 Kt. Seas 4 To 6 Ft. Wave Detail: Se 6 Ft At 8 Seconds And Se 4 Ft At 5 Seconds. Patchy Fog. Rain. Vsby 1 To 3 Nm. |
| Mon...W Winds 5 To 10 Kt. Gusts Up To 20 Kt In The Morning. Seas 4 To 6 Ft. Wave Detail: Se 6 Ft At 9 Seconds And E 3 Ft At 7 Seconds. Rain Likely In The Morning. |
| Mon Night...Sw Winds Around 5 Kt. Seas 2 To 4 Ft. Wave Detail: Se 4 Ft At 8 Seconds And S 2 Ft At 7 Seconds. |
| Tue Through Wed Night...Nw Winds 10 To 15 Kt. Seas 2 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 203am EDT Sat May 23 2026 .WHAT HAS CHANGED... Small Craft Advisories extended and expanded into the eastern outer waters on late Sunday through Monday. .KEY MESSAGES... - Rain arrives late Saturday leading to a soggy and cool Sunday with much needed rainfall. Cool daytime highs Sunday will rise Sunday night. - Wet to start Memorial Day, drying out through the day followed by summer-like warmth for the middle of next week before trending more seasonable with a few showers to end the week. KEY MESSAGE 1...Rain arrives late Saturday leading to a soggy and cool Sunday with much needed rainfall. Cool daytime highs Sunday will rise Sunday night. High pressure centered to our north and east will direct cool, easterly onshore flow into southern New England today. This trajectory with thickening and lowering clouds ahead of a warm front will lead to a cool day, topping out in the mid 60s. Fortunately, model soundings indicate a good amount of dry air in the low/mid levels and this, together with stubborn high pressure will keep the rain at bay for much of the region on Saturday. The most likely to stay dry all day will be areas RI north and east, with a better chance for afternoon or evening rain further west in CT and MA. By mid to late afternoon widespread, isentropically forced rainfall overspreads western CT/MA slowly expanding north and east. This is the start of a prolonged period of wet weather that continues through at least Sunday night. Forcing comes from low/mid level convergence and a potent 30-50 kts LLJ acting on an anomolously moist airmass (PWATs (Precipitable Waters) approaching 1.75"). Expecting rainfall totals of 0.5-1" for most of the region, with 1-2" more likely along the south coast of RI and MA before all is said and done. Small Craft Advisories are in place on Sunday where better mixing over the water will lead to wind gusts 25 to 35 mph while over land, gusts of 20 to 30 mph are more likely. KEY MESSAGE 2...Wet to start Memorial Day, drying out through the day followed by summer-like warmth for the middle of next week before trending more seasonable with a few showers to end the week. The mid level trough axis crosses SNE on Memorial Day ushering in a period of drier, zonal flow to later be followed by much more amplified flow late week. What it means for the Memorial Day is a transition between a very wet low passage on Sunday/Sunday night and dry high pressure on Tuesday. While confidence is only moderate at this point, ensemble and deterministic guidance would suggest an improving forecast through the day; read: best chance of lingering showers early in the morning, with decreasing POPs as the day progresses. This together with significantly warmer temperatures in the low 70s will make Monday more palatable than Sunday for many, even if clouds will be slow to clear. Models then agree on a warmer and drier period through mid week as 850 mb temps rise to the 12-13C range meaning we'll be back into the 80s Tuesday, flirting with the upper 80s by Wednesday. For the back half of the week, the previously mentioned return to amplified flow introduces more rain chances and cooler periods. Marine Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Saturday winds will be out of the E/SE 5-10 kts except 10-15 kts on the southern waters. A frontal system will bring enhanced southeast winds, building seas, and steady rain for the waters this evening through Sunday. Over the southern waters, SE winds increase to 25-30 kt by tonight, continuing through Sunday. Seas 1-4 ft on Saturday build to 6 to 10 ft through Sunday. SCAs are in effect for Sunday into Sunday night. Rain, some heavy at times Sunday, could reduce visibility as well. Outlook /Sunday Night through Wednesday/... Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Rain showers, slight chance of thunderstorms. Memorial Day: Winds less than 25 kt. Seas up to 5 ft. Chance of rain showers. Monday Night: Winds less than 25 kt. Seas up to 5 ft. Slight chance of rain showers. Tuesday: Winds less than 25 kt. Areas of seas approaching 5 ft. Tuesday Night: Winds less than 25 kt. Wednesday: Winds less than 25 kt. Slight chance of rain showers. NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...None. RI...None. Marine Small Craft Advisory from 5am Sunday to 2am EDT Monday for ANZ231. Small Craft Advisory from 2am Sunday to 5am EDT Monday for ANZ232>235-237. Small Craft Advisory from 8pm this evening to 5am EDT Monday for ANZ254>256. |
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