West Yarmouth, MA Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for West Yarmouth, MA

April 20, 2024 12:50 AM EDT (04:50 UTC) Change Location
Sunrise 5:50 AM   Sunset 7:29 PM
Moonrise 4:24 PM   Moonset 4:35 AM 
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NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.

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Marine Forecasts
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ANZ232 Nantucket Sound- 1001 Pm Edt Fri Apr 19 2024

Overnight - S winds 5 to 10 kt. Seas around 2 ft. Wave detail: S 2 ft at 4 seconds and E 1 ft at 4 seconds. Patchy fog. A chance of showers with vsby 1 to 3 nm.

Sat - SW winds 5 to 10 kt. Seas around 2 ft. Wave detail: sw 2 ft at 4 seconds and E 1 ft at 5 seconds. Patchy fog. Showers likely. Vsby 1 nm or less.

Sat night - W winds 10 to 15 kt with gusts up to 25 kt. Seas around 2 ft. Wave detail: W 2 ft at 4 seconds and se 1 ft at 6 seconds. Patchy fog in the evening with vsby 1 to 3 nm.

Sun - W winds 10 to 15 kt, becoming sw 15 to 20 kt in the afternoon. Seas 2 to 3 ft. Wave detail: W 2 ft at 3 seconds and se 1 ft at 6 seconds.

Sun night - SW winds 15 to 20 kt, becoming W 10 to 15 kt after midnight. Seas 2 to 3 ft. Wave detail: W 2 ft at 3 seconds and se 1 ft at 6 seconds.

Mon and Mon night - N winds 10 to 15 kt. Seas 1 foot or less.

Tue through Wed - S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft.

Wed night - W winds around 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of rain.
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.

ANZ200 1001 Pm Edt Fri Apr 19 2024

Synopsis for massachusetts and rhode island coastal waters - High pres over the waters south of nova scotia continues to move eastward tonight. A cold front then brings showers and a period of breezy conditions for Sat. High pres then returns for Sun and Mon, though with W to nw breezes.


7 Day Forecast for Marine Location Near West Yarmouth, MA
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Area Discussion for - Boston, MA
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FXUS61 KBOX 200154 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 954 PM EDT Fri Apr 19 2024

SYNOPSIS
An approaching cold front will bring a period of showers and a few downpours very late tonight into Saturday morning. Gradual partial clearing and pleasant temperatures are in store for later Saturday. Mostly clear skies and dry weather prevails Sunday and Monday, although both days could feature low relative humidities. Increasing clouds on Tuesday and Tuesday night heralds a frontal passage and rain chances for Wednesday.
Conditions trend drier for late next week. Temperatures should be around seasonable much of next week.

NEAR TERM /UNTIL 6 AM SATURDAY MORNING/

955 PM Update...

* Widespread Showers overspread the region between 2 and 8 AM

Previous forecast is pretty much on track. A fair amount of mid level cloudiness have overspread the region this evening...but dry weather prevailed. The shortwave/cold front was still back across western NY into central PA and there was not a ton of showers with it currently
That being said
we do expect forcing/deeper moisture to advect into the region ahead of the front
Therefore
showers will blossom across the region. Most of this activity will not overspread western MA/CT until after 2-3 am and will wait until near or after daybreak to impact much of the I-95 corridor. While there might be a spot shower or two a bit earlier...the main widespread showers will not overspread the region until between 2 and 8 am Saturday morning and perhaps a bit later across the Cape and Islands. Enough forcing and low level moisture are available to support a few brief downpours too. The clouds and increasing low level moisture will hold overnight low temps in the 40s.

SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/

Should have improving conditions from northwest to southeast from mid-morning to early-afternoon. QPF is in the neighborhood of a quarter and third of an inch, enough to provide the region with a wetting rain. The second-half of the day features mid- level dry air mass, should reduce the cloud cover, giving us a mix of sun and clouds. This should lead to a nice afternoon with highs in the low and middle 60s. Low clouds will be stubborn for the Cape and Island, but should clear our late afternoon, perhaps in time for sunset. Here the highs are slightly cooler in the middle and upper 50s.

Guidance this afternoon does show the a trailing mid-level shortwave that reaches southern New England mid to later afternoon. With this passage, a couple of rouge showers are possible, but should come to an end by sunset.

Overnight skies area clearing and despite s northwest wind at 10 to 15 mph, temperatures fall into the 30s. While much of the area remains above freezing, northern Worcester County and the east slopes of the Berkshires could see morning lows 30-34 degrees. May want to keep that in mind if you bought any potted outdoor plants.

LONG TERM /SUNDAY THROUGH FRIDAY/
330PM UPDATE:

Highlights:

* Clear and dry weather Sun and Mon with seasonable temps. Possible elevated fire weather concerns for both days, but especially Mon as NW winds increase.

* Continued dry, but with SW breezes along with more cloud cover.

* Although not a soaking rain, a frontal system around Wed or Wed night brings our next chance for rains.

* More uncertainty in the late-week pattern, but favoring dry weather.

Details:

Sunday through Tuesday:

Cyclonic flow aloft begins this period, associated with a potent shortwave disturbance which passes over northern New England into Mon. System's passing cold front moves through Mon too, but it will be a dry frontal passage with a windshift to NW and cooler temperatures being the only things really noticeable about the frontal passage. Pattern starts to flatten Mon night into Tue with a broad 1020+ mb high pressure cell ridging into Southern New England.

Dry weather to prevail in this period, even with the frontal passage passing to the north on Mon. Much of this period features mostly clear skies and though it will be a bit breezy from the northwest on Monday, it should be a stretch of pretty nice weather on the whole.
But as is typically the case in the early-spring/pre-greenup period with clear skies and good mixing leading to lower dewpoints, both Sun and Mon could feature elevated fire weather concerns. Of the two days, Mon looks to feature the lowest relative humidities and period of stronger NW winds (gusts 25-30 mph). Highs Sun and Mon look similar each day, in the 50s (upper 50s/near 60 in eastern MA). Lows in the mid/upper 30s Sunday night and in the low to mid 30s Mon night.

For Tue, high pressure shifts offshore early in the day, allowing for returning SW flow bringing modest SW breezes, but also increasing cloud cover (greatest late-day). RHs are a touch higher (35-50 percent) Tuesday so not thinking period of fire weather for Tue. Highs Tue should get to around 60 degrees. Turning mostly cloudy on Tue night ahead of a frontal system for Wed, and the increase in clouds brings milder nighttime lows in the 40s.

Wednesday:

12z ensembles and most deterministic models show a progressive frontal system moving across Southern New England in this period.
There is some timing differences that still need to be sorted out, with the ECMWF camp being slower with the progression (Wed late day into early-overnight Thurs); those differences led to PoP being no higher than Likely. A few days of dry weather preceding this frontal passage could favor a slower timing (e.g. some of the modeled QPF lost to evaporation through dry air layers) but won't deviate farther from NBM output to let the timing uncertainties iron themselves out. This doesn't look to be anything close to the soaking rains that plagued us in March but we should be able to see a period of wetting rains over a quarter-inch or so but not much more.

Late Week:

A bit of uncertainty here with differences in mass field evolution between the drier ECMWF/Canadian GEM and the GFS, which deepens an upper trough which closes off into a closed low near or west of Southern New England. That would bring unsettled weather and cloudier conditions to the area. This solution doesn't seem to have much support from its ensemble; official forecast will keep close to NBM for this period, but with a tilt towards the international guidance favoring drier conditions.

AVIATION /02Z SATURDAY THROUGH WEDNESDAY/
Forecast Confidence Levels:

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

00z TAF Update:

Tonight: High confidence in trends, though moderate to high on timing.

VFR through at least 04z (and 07-09z for eastern terminals), though with lowering cloud bases. MVFR ceilings around 06-08z for western terminals and after 09z for eastern airports as showers begin to overspread, then period of MVFR/IFR ceilings with steadier rains through 12z. S to SW winds around 10-12 kt to start, but will decrease to around 6-10 kt by daybreak.

Saturday...High confidence in trends, moderate confidence in the exact timing.

IFR/MVFR to start, -SHRA continues for terminals in Rhode Island and eastern Massachusetts through 15z/17z. May linger a bit longer for the outer Cape and Islands. Winds are 8 to 12 knots and are generally from the west, though eastern Massachusetts winds may remain out of the west/southwest.

Lastly, there is a low chance of a late afternoon pop-up shower due to a trailing shortwave, this could produce widely scattered rain.

Saturday Night...High confidence.

VFR, any lingering MVFR over the Cape and Islands become VFR between 02z and 04z. Otherwise a dry night. Winds are 10 to 15 knots from the west/northwest. Perhaps some gusts for the Cape and Island to 20 to 25 knots.

KBOS TAF...High Confidence in TAF.

KBDL TAF...High Confidence in TAF.

Outlook /Sunday through Wednesday/...

Sunday through Tuesday: VFR. Breezy.

Tuesday Night: VFR. Breezy. Slight chance SHRA.

Wednesday: Mainly VFR, with local IFR possible. Breezy. Chance RA.

MARINE
Forecaster Confidence Levels:

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

330PM UPDATE:

Today through Saturday Night...High Confidence.

Quiet conditions for the rest of Friday and tonight with seas and winds below advisory criteria. An approaching front does bring showers and perhaps a rumble of thunder Saturday morning with a wind shift from ESE/WSW. Showers linger into late Saturday morning/early afternoon. Drying out Saturday evening into the overnight hours. Winds may briefly reach advisory criteria late Saturday night 25 to 28 knots over the waters south of Rhode Island and Block Island. Given how marginal this is, held off on issuing a Small Craft Advisory. Later forecast may want to include if confidence increases.

Outlook /Sunday through Wednesday/...

Sunday through Sunday Night: Winds less than 25 kt. Seas locally approaching 5 ft.

Monday through Tuesday: Winds less than 25 kt.

Tuesday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Seas locally approaching 5 ft.

Wednesday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of seas approaching 5 ft. Chance of rain.

BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesinHgDewPt
44020 - NANTUCKET SOUND 9 mi40 min S 5.8G7.8 47°F 48°F30.0643°F
44090 14 mi50 min 46°F 46°F
CHTM3 19 mi50 min 45°F 49°F
BZBM3 - 8447930 - Woods Hole, MA 21 mi50 min 47°F 47°F30.08
NTKM3 - 8449130 - Nantucket Island, MA 26 mi50 min SE 5.1G7 46°F 51°F30.08
NBGM3 32 mi50 min SSW 7G8.9 47°F 30.08
44018 - SE Cape Cod 30NM East of Nantucket, MA 40 mi70 min 45°F2 ft
44085 42 mi54 min 46°F3 ft
BUZM3 - Buzzards Bay, MA 42 mi50 min SSE 2.9G4.1 45°F 30.09
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi50 min S 4.1G6 46°F 30.07
FRVM3 - 8447386 - Fall River, MA 46 mi50 min 47°F 50°F30.08
FRXM3 47 mi50 min 46°F 42°F


Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KHYA BARNSTABLE MUNIBOARDMAN/POLANDO FIELD,MA 3 sm54 minS 0510 smOvercast46°F37°F71%30.06
KFMH CAPE COD COAST GUARD AIR STATION,MA 12 sm54 minSSE 0510 smClear45°F39°F81%30.07
KCQX CHATHAM MUNI,MA 17 sm58 minS 0310 smOvercast45°F39°F81%30.08
KMVY MARTHA'S VINEYARD,MA 23 sm13 minSSE 0410 smOvercast46°F43°F87%30.06
Link to 5 minute data for KHYA


Wind History from HYA
(wind in knots)
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Tide / Current for Hyannis Port, Nantucket Sound, Massachusetts
   
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Hyannis Port
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Fri -- 03:21 AM EDT     0.57 feet Low Tide
Fri -- 04:16 AM EDT     Moonset
Fri -- 05:54 AM EDT     Sunrise
Fri -- 10:08 AM EDT     2.97 feet High Tide
Fri -- 03:23 PM EDT     Moonrise
Fri -- 03:56 PM EDT     0.39 feet Low Tide
Fri -- 07:26 PM EDT     Sunset
Fri -- 10:39 PM EDT     2.92 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Hyannis Port, Nantucket Sound, Massachusetts, Tide feet
12
am
2.1
1
am
1.5
2
am
0.9
3
am
0.6
4
am
0.6
5
am
0.8
6
am
1.1
7
am
1.6
8
am
2.2
9
am
2.7
10
am
3
11
am
2.8
12
pm
2.4
1
pm
1.8
2
pm
1
3
pm
0.5
4
pm
0.4
5
pm
0.5
6
pm
0.8
7
pm
1.2
8
pm
1.8
9
pm
2.4
10
pm
2.8
11
pm
2.9



Tide / Current for Cape Cod Canal, Massachusetts Current
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Cape Cod Canal
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Fri -- 01:11 AM EDT     0.04 knots Slack
Fri -- 04:17 AM EDT     Moonset
Fri -- 04:29 AM EDT     3.46 knots Max Flood
Fri -- 05:55 AM EDT     Sunrise
Fri -- 07:21 AM EDT     -0.18 knots Slack
Fri -- 10:12 AM EDT     -3.94 knots Max Ebb
Fri -- 01:32 PM EDT     0.17 knots Slack
Fri -- 03:24 PM EDT     Moonrise
Fri -- 05:00 PM EDT     3.86 knots Max Flood
Fri -- 07:28 PM EDT     Sunset
Fri -- 08:02 PM EDT     -0.10 knots Slack
Fri -- 10:45 PM EDT     -3.83 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Cape Cod Canal, Massachusetts Current, knots
12
am
-2.7
1
am
-1.1
2
am
2.2
3
am
3.1
4
am
3.4
5
am
3.4
6
am
3
7
am
1.7
8
am
-2.3
9
am
-3.5
10
am
-3.9
11
am
-3.8
12
pm
-3.2
1
pm
-2
2
pm
1.8
3
pm
3.1
4
pm
3.7
5
pm
3.9
6
pm
3.7
7
pm
2.9
8
pm
0.6
9
pm
-2.8
10
pm
-3.7
11
pm
-3.8




Weather Map
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GEOS Local Image of north east   
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Boston, MA,



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