Narragansett Bay Marine Forecast
| This Afternoon...Ne Winds 15 To 20 Kt With Gusts Up To 25 Kt. Waves Around 3 Ft. A Slight Chance Of Showers. |
| Tonight...Ne Winds 15 To 20 Kt With Gusts Up To 25 Kt. Waves 2 To 3 Ft. A Chance Of Showers. |
| Wed...Ne Winds 15 To 20 Kt With Gusts Up To 25 Kt. Waves 2 To 3 Ft. A Chance Of Showers. |
| Wed Night...Ne Winds 10 To 15 Kt. Gusts Up To 20 Kt In The Evening. Waves 2 To 3 Ft. A Chance Of Showers. Patchy Fog After Midnight. |
| Thu...Ne Winds 15 To 20 Kt With Gusts Up To 30 Kt. Waves 2 To 3 Ft, Building To 3 To 5 Ft In The Afternoon. Showers. Patchy Fog In The Morning. Vsby 1 To 3 Nm In The Afternoon. |
| Thu Night...Se Winds 15 To 20 Kt With Gusts Up To 25 Kt. Waves 3 To 5 Ft. Showers With A Chance Of Tstms. Vsby 1 To 3 Nm. |
| Fri...Sw Winds 20 To 25 Kt With Gusts Up To 30 Kt. Waves 4 To 6 Ft. Showers Likely. Vsby 1 To 3 Nm. |
| Fri Night...W Winds 25 To 30 Kt With Gusts Up To 35 Kt. Waves 5 To 7 Ft. |
| Sat...W Winds 25 To 30 Kt With Gusts Up To 35 Kt. Waves 4 To 6 Ft, Except 6 To 9 Ft At The Bay Entrance. |
| Sat Night...W Winds 15 To 20 Kt With Gusts Up To 25 Kt. Waves 2 To 4 Ft. Winds And Waves Higher In And Near Tstms. 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 227pm EDT Tuesday Oct 28 2025 Synopsis Canadian high pressure will result in cool temperatures through tomorrow night with scattered showers possible, mainly near and southeast of I-95. Strong low pressure follows with a period of heavy windswept rain for southern New England later Thursday and Thursday night. Drying out for Friday with gusty winds which linger into Saturday. Dry weather is likely Friday into next week. Near Term - Through Tonight Key Messages: * Breezy NE winds, mainly for Cape/Islands with gusts 20-30 mph. * Slightly below normal temperatures with a few showers possible mainly southeast of I-95. Tonight A steady northeast flow associated with a coastal low-pressure system off the Mid-Atlantic coast will continue to blanket southern New England with marine stratus, limiting how much temperatures can fall overnight. Expect a milder night than last, with lows in the low to mid-40s across southeastern Massachusetts and the Cape, where overcast skies and mechanical mixing from persistent northeast winds will inhibit radiational cooling. Farther north and west across the interior, partial clearing and a decoupled boundary layer will allow for lower temperatures, ranging from the mid-30s to low 40s. Overall, a dry and quiet night is expected, though a few light showers may occur over the Cape and Islands in association with the offshore low. Short Term - Wednesday Through Wednesday Night Key Messages: * Cooler temperatures continue Wednesday with scattered ocean-effect showers mainly near/southeast I-95. Details... Tomorrow Little change is expected from today’s weather pattern. A broken to overcast cloud deck between 2,000 and 3,000 feet will persist, accompanied by steady northeast winds. High temperatures will again range from the low to mid-50s. Winds will remain sustained at 10 to 15 knots, with occasional gusts up to 25 knots possible across the Cape, Islands, and coastal areas. Deep-layer moisture increases through the day, with PWATs (Precipitable Waters) rising to 0.8–1.0 inches across eastern Massachusetts and Rhode Island. This will support increasing shower chances during the early to mid- afternoon hours. Expect a few light showers to develop, but otherwise another cool and quiet autumn day. Tomorrow Night More of the same pattern continues into tomorrow night, with the offshore low maintaining steady northeast winds and overcast skies. Lows will again range from the mid to upper 40s across southeastern Massachusetts to the mid-30s and low 40s inland. The main change will be an increasing chance of showers across southern New England as low levels continue to moisten and PWATs (Precipitable Waters) approach 0.8 inches. Up to a tenth of an inch possible for portions of southeast MA by Thursday AM. Long Term - Thursday Through Monday Key Messages: * Period of heavy rainfall and gusty winds expected Thu into Thu night. * Brief nuisance street flooding possible & 30-50 mph gusts on the coast * Gradual clearing Friday with potential for gusty westerly winds. Details... Key Messages... * A quick hitting storm will bring a period of heavy rain and gusty winds Thursday into Thursday night. * Some isolated nuisance street flooding is possible, exacerbated by abundance of fallen leaves. * Winds will become increasingly breezy late Thursday but really windy on Friday behind the rain. * Dry and a bit cooler than seasonable through early next week. The focus of the extended forecast will be on a storm system moving through late Thursday and Thursday night. We'll see a deepening surface low pressure lift from the deep south into the Mid- Atlantic Thursday and into Maine by Friday. This happens while at the mid levels a deep trough digs into the eastern seaboard, lifting northeast at the same speed. What this means for southern New England is a period of heavy rain and breezy winds as deep, moist, SW flow ahead of the trough advects PWATs (Precipitable Waters) of near 1.75" coincident with a 45-55 kt 85mb LLJ all while beneath the RRQ of a 125kt upper jet. This ample moisture and forcing will lead to a stretch of widespread, sometimes heavy rain which is poised to drop 1 to 3 inches of rain across the region. Fortunately this is a progressive system so the period of heaviest rain should be quick enough to avoid much in the way of flooding impacts. It also looks to be heaviest overnight, between the Thursday eve and Friday morn commutes which would minimize impacts. That being said, given the amount of leaves ready to fall and already on the ground we could see nuisance street flooding. The location of the heaviest rainfall will depend on the exact track of the low but at this time ensemble guidance places it over Cape Cod and the islands with a 20-40% chance of at or above 2 inches of rain in 24 hours. Friday after sunrise the dry slot rushes in and much, if not all of the day should be dry with partly sunny skies and only a Probability of Precipitation up shower or two thanks to the cold pool(a region of relatively cold air) overhead. The biggest story for Friday into Saturday will be the gusty winds as a cold advection pattern mixes down a 45-55 kt LLJ. Wind headlines may be needed Friday and/or Friday night. For the weekend the pressure gradient relaxes a bit but it will still be windy on Saturday before calming down Sunday. Dry and near seasonable weather (a few degrees cooler than average) with highs in the low to mid 50s then continues as surface high pressure moves overhead with mid level ridging by Monday. Marine Forecaster Confidence Levels... Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. Tonight Gale force northeast winds develop over the coastal marine zones south of The Islands. The strong winds will develop in response to a tightening pressure gradient between high pressure over Canada and an area of low-pressure moving up the east coast. Elsewhere across the coastal waters, expect solid SCY conditions with 25 to 30 knot northeast wind gusts. Seas increasing to 6 to 8 feet over the eastern/outer marine zones. 2-5 feet over the south coastal near- shore zones. Tomorrow and Tomorrow Night The pressure gradient relaxes somewhat tomorrow allow for gradually diminishing northeast winds throughout the day. Despite declining wind speeds, we're still expecting 20 to 30 knot northeast gusts throughout the day with showers developing in the afternoon. Seas gradually subside by a foot or two as well, but remain elevated between 5 and 8 feet over the outer marine zones. These conditions will persist through tomorrow night. Outlook /Thursday through Saturday/... Wednesday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 9 ft. Chance of rain showers, patchy fog. Thursday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 8 ft. Chance of rain showers. Thursday Night: Strong winds with gusts up to 30 kt. Rough seas up to 8 ft. Rain showers. Visibility 1 to 3 nm. Friday: Moderate risk for gale force winds with local gusts up to 45 kt. Rough seas up to 15 ft. Chance of rain showers. Friday Night: gale force winds with gusts up to 45 kt. Rough seas up to 17 ft. Slight chance of rain showers. Saturday: Moderate risk for gale force winds with local gusts up to 45 kt. Rough seas up to 17 ft. NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...None. RI...None. Marine Small Craft Advisory until 8am EDT Thursday for ANZ231>235- 237-250-251-254. Gale Warning from 7pm this evening to 8am EDT Thursday for ANZ255-256. |
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