Marine Weather Net

Nantucket Sound Marine Forecast


5 - 10


10 - 15


5 - 10


10 - 15

The Marine Weather Forecast In Detail:
ANZ232 Forecast Issued: 108 AM EDT Mon May 23 2022

Rest Of Tonight...W Winds 5 To 10 Kt With Gusts Up To 20 Kt. Seas Around 2 Ft.
Mon...N Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas Around 2 Ft.
Mon Night...Ne Winds 5 To 10 Kt. Gusts Up To 25 Kt After Midnight. Seas Around 2 Ft.
Tue...Ne Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 2 To 3 Ft.
Tue Night...E Winds 5 To 10 Kt. Seas Around 2 Ft.
Wed And Wed Night...S Winds 5 To 10 Kt. Seas Around 2 Ft.
Thu...S Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 2 To 3 Ft.
Thu Night Through Fri Night...Sw Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 2 To 4 Ft. A Chance Of Showers. 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
1009pm EDT Sunday May 22 2022

Cooler and more seasonable weather returns later tonight and continuing into Monday, Tuesday and Wednesday, with delightful weather and low humidity. A warming trend begins late in the work week with the risk for a period of showers and perhaps a few thunderstorms sometime later Thursday and/or Friday. Memorial Day weekend looks to feature above normal temperatures and mainly dry weather.

.NEAR TERM /UNTIL 5am MONDAY MORNING/... 1015pm Update..

Thunderstorms have just about dissipated, with only a broken line of showers from northeast MA to the Worcester Hills and eastern CT. Behind this line of showers, post frontal airmass with gusty NW winds and dew pts falling into the 50s later tonight.

Areas of fog across southern RI into southeast MA, including Cape Cod and the islands, will only linger a few more hours, then improving with the wind shift and change in airmass. Previous forecast on track, so not expecting many changes with this update. Earlier discussion below.


Otherwise, the main story later tonight will be much drier/cooler air that gets ushered into the region behind the cold front. Low temps by daybreak will mainly be in the middle 50s to the lower 60s with a noticeably drier airmass.

.SHORT TERM /5am MONDAY MORNING THROUGH MONDAY NIGHT/... Highlights... * Dry/Much cooler Monday with very pleasant temps returning

Monday... Quite a change in the airmass will occur behind tonight/s cold frontal passage. High pressure nosing down from northern New England will result in 850T dropping to between +6C and +8C on Mon. While there will be some mid/high level cloudiness expect partial sunshine too. High temps will be much cooler than today with readings topping out in the lower to middle 70s inland from the immediate coast. Dewpoints dropping into the 40s will make it feel much cooler than what we are currently experiencing. The high pressure system centered over northern New England will result in an onshore flow developing along much of the coast. Therefore, high temps will mainly be in the middle to upper 60s along much of the immediate coast including the Cape and Islands. Overall...a very pleasant seasonable day across the region.

Monday night... High pressure will be nosing down from northern New England. There will be some mid/high level cloudiness in association with some shortwave energy. However, we think the threat for any light rain will remain to our southwest given lack of low level moisture. The ECMWF (European Centre for Medium-Range Weather Forecasts) is a bit more aggressive and does show a bit of light rain near the south coast late Monday night. At this time though; it is a northern outlier and we are not going with it given the amount of low level dry air. Low temps will be cooler than recent nigheights given the high pressure system in northern New England. Low temps should bottom out mainly in the 40s to the lower 50s.

Long Term - Tuesday Through Sunday
* Highligheights *

- Seasonable temperatures early in the week - Warm/unsettled weather settles in late week - Outlook for the holiday weekend points toward above normal temperatures and low rain chances.

Tuesday through Wednesday night

High pressure and north/northeasterly flow will support normal to slightly below normal temperatures across southern New England on Tuesday and Wednesday. Nonetheless, expecting pleasant days despite being a bit on the cool side with onshore flow limiting high temperatures to the low 70s across the interior and low to mid 60s along the coastal plain. Additionally, Wednesday and Thursday morning will feature rather chilly temperatures for late May in the upper 40s to low 50s. There will be some cloudiness on Tuesday and Wednesday, but plenty of sunshine as well.

Thursday and Friday

High pressure shifts east on Thursday allowing the return of south/southwesterly flow into southern New England. This will result in increasing temperatures and humidity. Meanwhile, a low-pressure system will be tracking over The Great Lakes. Expect to see some scattered precipitation late Thursday as a warm front associated with the Great Lakes system lifts through southern New England. Additional precipitation expected Thursday night and Friday as the cold front associated with this system pushes through the region. May be a shot for a few thunderstorms with this frontal passage as well. This will largely depend on instability, which at this time looks quite marginal.

Next Weekend

Little change in temperatures for Saturday despite the cold frontal passage. However, dewpoints will come down behind the front supporting drier conditions for Saturday. South/southwesterly flow develops by Sunday allowing for temperatures and humidity to climb toward the end of the weekend.

Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent.

Tonight through Monday night...High Confidence. Southwest winds shift to the northwest late tonight behind a strong cold front. Northerly winds of 10 to 15 knots are then expected most of Mon and Monday night. Winds and seas should generally remain below small craft advisory thresholds; but some marginal 20-25 knot gusts will be possible toward daybreak Tue.

Outlook /Tuesday through Friday/... Tuesday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Tuesday Night through Wednesday: Winds less than 25 kt. Seas locally approaching 5 ft.

Wednesday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers.
Thursday: Winds less than 25 kt. Seas up to 5 ft. Slight chance of rain showers.
Thursday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Chance of rain showers.

Friday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 7 ft. Chance of rain showers.

Today May 22nd... BOS 93F (1959) PVD 94F (1941, 1992) BDL 95F (1992) ORH 90F (1911, 1992)

Monthly record high temperatures... BOS 97F (05/26/1880) PVD 96F (05/26/2010) BDL 99F (05/26/2010, 05/20/1996) ORH 94F (05/26/2010)

NOAA Boston MA Office: Watches - Warnings - Advisories
CT...None. MA...None. RI...None.