Boston Harbor Marine Forecast
| Rest Of Tonight...Nw Winds 10 To 15 Kt. Waves Around 2 Ft. |
| Sat...W Winds Around 10 Kt. Waves 1 Foot Or Less. |
| Sat Night...Sw Winds 10 To 15 Kt. Gusts Up To 20 Kt After Midnight. Waves Around 2 Ft. Rain. Vsby 1 To 3 Nm. |
| Sun...W Winds 15 To 20 Kt, Increasing To 20 To 25 Kt In The Afternoon. Gusts Up To 30 Kt. Waves Around 2 Ft. |
| Sun Night Through Mon Night...W Winds 20 To 25 Kt With Gusts Up To 30 Kt. Waves Around 2 Ft. |
| Tue Through Wed Night...Nw Winds 15 To 20 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. |
| Area Forecast Discussion National Weather Service Boston/Norton MA 301am EST Sat Nov 15 2025 Synopsis Weak high pressure will bring dry weather with less wind today. A frontal system will bring a period of rain tonight, then drying out and becoming windy Sunday. Blustery and cool weather prevails early next week, then diminishing wind and continued dry weather into midweek as high pressure builds in from the west. Milder conditions develop for the end of the week along with a chance of rain. Near Term - Until 6pm This Evening Key Messages: * Cool and dry today with increasing afternoon clouds Weak high pressure to the west will slide south of New England then move offshore this afternoon. Sunshine will be plentiful this morning, but backing flow aloft with approaching shortwave energy to the west will result in increasing mid-high clouds this afternoon. Rain will develop to the west this afternoon ahead of a warm front, but dry air in the 925-850 mb layer will keep it dry today with rain not arriving until after dark. Highs will be in the mid to upper 40s with generally light winds becoming SW this afternoon. Short Term - 6pm This Evening Through 6pm Sunday Key Messages: * Rain quickly overspreads the region this evening and exits late tonight. Brief gusty winds over the Islands around midnight * Becoming windy Sunday. Chance of a few rain/snow showers in western MA in the afternoon Tonight... Warm front moves into the region tonight. Good moisture transport and low level convergence at the nose of a low level jet will result in rain quickly overspreading SNE from west to east between 7-9 pm. Hi-res guidance is indicating marginal low level cold air over the northern Berkshires this evening as the rain moves in so can't rule out brief freezing rain here at the onset. But expect any icing to be isolated and brief as temps will be rising into and through the 40s and into the lower 50s near the south coast. This is quick hitting system with dry slot racing into SNE after 06z so expect rain will be ending before daybreak with a 6 hour period of rainfall for most locations. Decent forcing for ascent and moisture transport with PWATs (Precipitable Waters) increasing to 1"+ support brief moderate to heavy rain and rainfall amounts should average around 0.50". There is some elevated instability especially to the south and hi-res CAMs show a convective nature to the rainfall so can't rule out an isolated rumble of thunder near the south coast. Will have to monitor wind potential near the immediate south coast around and after midnight as low level jet develops. Soundings do not show much mixing potential but with temps rising into low 50s could see a period of 30-40 mph gusts, mainly over the Islands. Sunday... Cold front will be moving through SNE during the pre-dawn hours and will move off the coast by mid morning. Excellent drying behind the front as PWATs (Precipitable Waters) drop to near 0.25" during the afternoon so expect partly to mostly sunny skies developing. However, a potent shortwave and accompanying cold pool(a region of relatively cold air) will be rotating through SNE in the afternoon so can't rule out a few showers, especially over the higher terrain. Also, strong cold advection develops with deepening boundary layer leading to strong wind gusts developing. Soundings support wind gusts to 30-40 mph and higher gusts are possible over the higher elevations later in the afternoon. Highs will be reached in the morning with low-mid 50s in the coastal plain and 40s interior, then falling temps through the 40s in the afternoon, and into the 30s higher elevations. Long Term - Sunday Night Through Friday Key Messages: * Mainly dry and blustery Mon-Tuesday with below normal temps * Less wind and a bit milder Wed-Thu * Unsettled weather with seasonable temps Friday Upper low moves into the Maritimes Monday with flow gradually de-amplifying toward midweek as broad ridge approaches from the west. Overall it's a dry pattern as PWATs (Precipitable Waters) are low with no significant shortwave passages. By the end of the week, moisture will be approaching from the west ahead of low pressure moving through the Gt Lakes so may see some wet weather develop Friday. Monday will be the coolest day with windy conditions then moderating temps and less wind through Wed-Thu as high pressure builds into the region. Mildest day will be Friday as increasing SW flow brings seasonable temps back to SNE. Marine Forecaster Confidence Levels... Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. Gale watches continue for Sunday into Monday Winds and seas will be below SCA (Small Craft Advisory) thresholds today. A developing low level jet will bring increasing SW winds tonight with gusts to 25-35 kt after midnight, strongest gusts over southern waters where brief gales are possible. Then on Sunday winds shift to W with gale force gusts to 35-40 kt on most of the waters. Building seas tonight and Sunday reaching 8-12 ft Sunday afternoon over the southern waters. Outlook /Sunday Night through Wednesday/... Sunday Night: Moderate risk for gale force winds with gusts up to 40 kt. Rough seas up to 15 ft. Slight chance of rain showers. Monday: Strong winds with gusts up to 35 kt. Rough seas up to 14 ft. Monday Night: Strong winds with gusts up to 35 kt. Rough seas up to 12 ft. Tuesday: Low 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: Winds less than 25 kt. NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...None. RI...None. Marine Gale Watch from Sunday morning through Monday evening for ANZ230>237-250-251-254>256. |
Boston MA Radar
Northeast Radar
East Coast Satellite