Boston Harbor Marine Forecast
| Tonight...Sw Winds 10 To 15 Kt With Gusts Up To 25 Kt. Waves Around 2 Ft. |
| Sun...W Winds 15 To 20 Kt With Gusts Up To 30 Kt. Waves Around 2 Ft. |
| Sun Night...W Winds 10 To 15 Kt With Gusts Up To 25 Kt. Waves Around 2 Ft. |
| Mon...Sw Winds 10 To 15 Kt, Increasing To 15 To 20 Kt In The Afternoon. Gusts Up To 25 Kt. Waves Around 2 Ft. |
| Mon Night...Sw Winds 20 To 25 Kt With Gusts Up To 30 Kt. Waves Around 2 Ft. |
| Tue...W Winds 20 To 25 Kt With Gusts Up To 30 Kt. Waves Around 2 Ft. A Chance Of Snow Showers In The Morning. |
| Tue Night...W Winds 15 To 20 Kt, Diminishing To 10 To 15 Kt After Midnight. Waves Around 2 Ft. |
| Wed...Sw Winds 10 To 15 Kt With Gusts Up To 20 Kt. Waves Around 2 Ft. A Chance Of Snow And Rain. |
| Wed Night...W Winds 15 To 20 Kt. Waves Around 2 Ft. A Chance Of Snow. |
| Thu And Thu Night...Nw Winds 15 To 20 Kt With Gusts Up To 25 Kt. Waves Around 2 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. |
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Area Forecast Discussion National Weather Service Boston/Norton MA 332pm EST Sat Jan 25 2025 Synopsis Mainly dry Sunday with more seasonable temperatures through Monday. Turning more windy Monday, with gusty winds peaking Tuesday. A cold front will bring colder temperatures and possibly snow squalls on Tuesday. Clipper system could bring light snow to the region Wednesday. Arctic airmass will likely bring very cold temperatures and wild chills near zero both Thursday and Friday. Near Term - Until 6am Sunday Morning High pressure dominates through the rest of Saturday into the overnight hours, but a trough of low pressure begins to approach toward midnight/6am and one result will be the evolution of a 35-45 kt LLJ overhead, some of which mixes down as gusts 20-25 mph. Overnight though this is mainly confined to the waters and immediate coast, especially Cape Cod where there will be less inhibition by an inversion. The moderating flow will also usher in a much milder airmass than last night with lows only in the teens and 20s compared to single digits. Short Term - 6am Sunday Morning Through Sunday Night The mid level shortwave mentioned above sweeps across the region early; just enough moisture and lift available to have some light rain/snow chances over far southeast MA, though latest guidance has trended further offshore with this feature, so those POPs may continue to be reduced. Regardless, drier air quickly fills in in the mid/upper levels leading to more sun through the day. Gusty winds, though, will expand during the day, gusting 20 to 30 mph for most. Fortunately temperatures will also be warmer Sunday thanks to the moderating airmass, with highs in the upper 30s to low 40s. Overnight the core of the jet moves offshore and winds will diminish. Long Term - Monday Through Saturday Key Points * Mainly dry with increasing winds Monday. * Snowsqualls possible Tuesday with very windy conditions. * Clipper system may bring light snowfall Wednesday. * Arctic airmass moves back in for Thursday and Friday with windchill values near zero again. Monday: Mainly dry Monday as the pressure gradient tightens ahead of a strong low-pressure system and cold front dropping south from Canada. Winds become very gusty from the SW by up to 30mph on Monday afternoon. The strong southwesterly winds will allow temps to warm into the mid to upper 30s, with low 40s possible near the coasts. Tuesday: The cold front associated with the low moving out of Canada reaches us Tuesday morning. Still, some uncertainty on the exact timing of the cold front as models have trended it slightly later. The timing will be important because snowsqualls become more likely with a later frontal passage. The environment will be primed for snowsqualls as strong pressure couplet, Steep low-level lapse rates above 7C/km, and good low to mid-level moisture. With a slower frontal passage, we can add more diurnal heating, boosting lapse rates and low-level instability. High temperatures will peak in the 30s again prior to the cold frontal passage, then quickly drop into the 20s behind. Winds will also be near Wind Advisory threshold of 46mph on Tuesday prior to the frontal passage as a SW 850mb jet around 60 knots moves over the region. NBM probabilities for 46mph gusts remain low, less than 20%, but the timing of the jet and front could allow diurnal heating to mix down stronger winds with a slower- moving system. Wednesday: A weak clipper system follows behind Tuesdays cold front. Guidance is still showing uncertainty in the track, with the GFS (Global Forecast System) showing a more southerly track over SNE, while the Euro and Canadian show a more northern track over NNE. With temperatures below freezing behind the cold front, any precipitation that falls Wednesday will fall as snow. Any snow that does fall appears to be light at this time, with limited moisture available, leading to Quantitative Precipitation Forecast under a quarter of an inch. More details will come with this system as the guidance continues to nail down the track. Thursday and beyond: High pressure looks to build back in for the remainder of the week, but it will be accompanied by another Arctic airmass. High temps Thursday and Friday will be in the low to mid-20s, with overnight lows once again in the single digits. Winds remain blustery out of the NW both days, keeping the wind chill values near or below zero. Marine Forecaster Confidence Levels: Low - less than 30 percent. Medium - 30 to 60 percent. High- greater than 60 percent. Tonight and Sunday...High confidence. As modest low level jet develops, SW winds will increase tonight with gusts 25-30 kt, then W gusts 25-30 kt Sunday. Seas build to 5-7 ft over the southern waters. SCA (Small Craft Advisory) in effect tonight and Sunday. Sunday night...High confidence. W winds 15-20 kts with gusts 20-25 to start the night, diminishing through the overnight hours. Seas 3-5 ft. Outlook /Monday through Thursday/... Monday: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas. Monday Night through Tuesday: Strong winds with gusts up to 35 kt. Rough seas up to 11 ft. Gale warnings may be needed Tuesday Night: High risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas. Wednesday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas. Chance of snow, slight chance of rain. Wednesday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Chance of snow, slight chance of rain. Thursday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 8 ft. Slight chance of snow. NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...None. RI...None. Marine Small Craft Advisory from 7am to 7pm EST Sunday for ANZ230- 236. Small Craft Advisory until 10pm EST Sunday for ANZ231>235-237- 251. Small Craft Advisory until 5am EST Monday for ANZ250-254>256. |
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