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

June 23, 2024 8:02 PM EDT (00:02 UTC) Change Location
Sunrise 5:05 AM   Sunset 8:21 PM
Moonrise 10:19 PM   Moonset 6:15 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.

Marine Forecasts
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ANZ232 Nantucket Sound- 704 Pm Edt Sun Jun 23 2024

.small craft advisory in effect through late Monday night - .

Tonight - SW winds 20 to 25 kt with gusts up to 40 kt. Seas 4 to 6 ft. Wave detail: S 5 ft at 7 seconds and sw 4 ft at 4 seconds. A chance of showers with a slight chance of tstms. Vsby 1 to 3 nm.

Mon - SW winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 4 to 6 ft. Wave detail: sw 4 ft at 4 seconds and sw 4 ft at 8 seconds. A chance of showers in the morning with vsby 1 to 3 nm.

Mon night - W winds 15 to 20 kt, becoming nw 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 4 to 6 ft, subsiding to 2 to 4 ft after midnight. Wave detail: W 3 ft at 4 seconds and S 2 ft at 9 seconds, becoming W 2 ft at 3 seconds and S 2 ft at 9 seconds.

Tue - NW winds 10 to 15 kt. Seas 2 to 3 ft. Wave detail: N 2 ft at 3 seconds and sw 2 ft at 8 seconds.

Tue night and Wed - SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Wave detail: sw 3 ft at 5 seconds and N 1 foot at 4 seconds.

Wed night - SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave detail: sw 3 ft at 4 seconds and S 3 ft at 7 seconds. A chance of showers.

Thu and Thu night - SW winds 10 to 15 kt with gusts up to 20 kt, becoming nw. Seas 2 to 3 ft. A chance of showers.

Fri and Fri night - NE winds 10 to 15 kt, becoming se 5 to 10 kt. Seas around 2 ft.
winds and seas 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.

ANZ200 704 Pm Edt Sun Jun 23 2024

Synopsis for massachusetts and rhode island coastal waters - Low pressure will pass well to the north and bring a cold front across the waters Monday. High pressure builds in for Tuesday. Another cold front moves through late Wednesday and early Thursday with high pressure building in for Friday and Saturday.


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 232255 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 655 PM EDT Sun Jun 23 2024

SYNOPSIS
Warm and humid this afternoon with another round of showers and thunderstorms, with the focus across western and central MA/CT this evening. Some storms may become severe, with strong to damaging winds and perhaps a few tornadoes. A few diurnally driven showers will remain possible Monday but lowering humidity. Dry and very warm weather is on tap for Tuesday but with comfortable humidity. Hot and humid weather returns later Wednesday.
Another round of showers and thunderstorms is possible later Wednesday, perhaps lingering into Thursday
Otherwise
drier weather with lower humidity returns by Friday.

NEAR TERM /THROUGH MONDAY/
7pm Update:

Thunderstorms moving east are now struggling to maintain intensity with waning instability with the loss of diurnal heating and increasing MLCIN. Expecting most of the thunderstorms to diminish by 9pm with only leftover showers through midnight.

Key Points

* Tornado watch remains in effect until 8pm tonight * Showers and thunderstorms overnight near the Cape and Islands

This afternoon and evening:

A deepening shortwave trough will drop out of the Great Lakes this afternoon into New England tonight. This shortwave will provide the main forcing mechanism for severe thunderstorms this afternoon. Have already begun to see thunderstorm initiation across western NY. As these storms move east, they will continue to move into a very favorable environment for severe wind gusts and tornadoes. SBCAPE values have surged into the 2000-3000 J/kg range with 40-50 knots of sfc-6km bulk wind shear. SPC meso analysis currently indicates low level lapse rates near 7-8C/km and DCAPE values upwards of 1200 J/kg. These factors combined with strong jet dynamics from the 30-40 knot LLJ will bring an enhanced risk for severe wind gusts with any thunderstorm through 8pm tonight. With strong curvature in the low level hodographs, latest hi-res guidance suggests storm mode will start with discrete supercells before congealing into line structures as they move east. Any discrete supercells that form this afternoon will contain a tornado threat with STP values approaching 2-3 and 0-1km SRH approaching 150-200 m/s.
The only mitigating factor this afternoon are mediocre mid level lapse rates only around 5.5C/km. Hail remains a secondary threat with freezing levels around 14kft and large amounts of moisture in the column. Heavy rain also remains a threat, but flash flooding looks less likely with fast moving thunderstorms.

Tonight:

Thunderstorms should wane into showers after 8pm tonight. The next focus for heavier showers and possibly some embedded thunder moves out over the Cape and Islands after midnight as the shortwave through and LLJ tap into some elevated instability. Not expecting any severe weather with these showers and thunderstorms other then periods moderate to heavy rain.
Showers and thunderstorms should move well offshore by sunrise tomorrow. Overnight lows remain warm in the upper 60s to low 70s due to an abundance of cloud cover and dew-points remaining in the upper 60s.

SHORT TERM /MONDAY NIGHT/
Key Points

* Less heat and humidity * Weak afternoon showers, but no severe weather

Tomorrow:

Shortwave trough and cold front moves through much of New England in the afternoon, but with limited moisture and instability, we finally break the daily severe weather chances.
There will still be scattered low topped showers with strong cyclonic vorticity overhead and low amounts of SBCAPE at 100 J/kg or less. Behind the cold front, 850mb temps will drop to 10C allowing the region to finally get a break from the excessive heat and humidity from the past week. High temperatures tomorrow range from the upper 70s in NW MA, to upper 80s in SE MA. Dewpoints also drop into a more comfortable range in the low 60s.

Monday night:

Secondary cold front moves through overnight, but with a drying column, no precipitation is expected. This cold front will continue to bring dewpoints down into the 50s overnight. With clear skies and low dewpoints, temps should be able to drop down into the low 60s to even upper 50s.

LONG TERM /TUESDAY THROUGH SUNDAY/
Key Points...

* Dry & very warm Tue with tolerable humidity * Humid with showers/t-storms later Wed which may linger into Thu * Dry & seasonable Fri * Humidity increases next weekend with risk of showers/t-storms Sun

Details...

Tuesday...

Shortwave ridging briefly builds across the region on Tue. This will result in abundant sunshine and a very warm afternoon...but with tolerable humidity. Highs Tue should mainly be in the middle to upper 80s.

Wednesday and Thursday...

The next shortwave trough will slide southeast across the Great Lakes Wed. This will induce southwest low level flow and increasing humidity. The amount of solar insolation will determine the high temps Wed...but currently thinking upper 80s to lower 90s away from the south coast.

Diurnal heating along with increasing dewpoints will likely allow for modest instability to develop Wed. The bigger question remains the timing of the shortwave and associated cold front.
While
timing is uncertain
the threat for showers & t-storms will increase late Wed into Wed night. It is too early to assess the severe weather potential...but given that a remnant EML looks to be in place with modest effective shear will have to watch this closely.

Not sure if Thu will turn out dry or the threat for a few showers/t- storms will continue. The current guidance seems to favor a more drier solution Thu...but that certainly is subject to change.

Friday...

High pressure builds in behind the cold front and should result in a very nice end to the work week. Plenty of sunshine expected on Fri with highs in the upper 70s to the middle 80s along with low/comfortable humidity.

Next Weekend...

The high pressure system moves east of the region on Sat...but current indications favor mainly dry weather with a gradual increase in humidity
It is a long way off
but by Sunday it looks like it may be rather humid and the threat for some showers & t-storms will increase ahead of the next shortwave trough/cold front.

AVIATION /00Z MONDAY THROUGH FRIDAY/
Forecast Confidence Levels:

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

Tonight...Moderate confidence.

Thunderstorms weaken into showers after 00z with drying conditions after 06z. Low end MVFR to IFR conditions across much of the region. Light to moderate rain and possibly a rumble of thunder across the Cape and Islands after 06z tonight. SW winds remain elevated at 15 to 25 knots along with continued wind shear over the Cape and Islands with 50-60 knots LLJ.

Monday...High confidence.

IFR/MVFR CIGS lift to VFR region wide in the mid to late morning. Winds turn west at 10-15 knots in the afternoon.
Interior terminals may see weak showers in the afternoon through sunset.

KBOS TAF...Moderate confidence in TAF

VFR this afternoon with gusty SW winds up to 25 knots. Chance for thunderstorms this evening between 23-01z, with showers possibly lingering to 06z. IFR to low end MVFR tonight, lifting to VFR tomorrow morning after 12z-14z. Winds turn west in the afternoon at 10-15 knots. Low chance for weak showers tomorrow afternoon

KBDL TAF...Moderate confidence in TAF

VFR this afternoon with a chance for thunderstorms this mainly between 22z-00z. MVFR to VFR tonight. VFR tomorrow with scattered light showers in the afternoon and gusty west winds.

Outlook /Tuesday through Friday/...

Tuesday: VFR.

Tuesday Night: VFR. Breezy.

Wednesday: Mainly VFR, with areas MVFR possible. Breezy. Chance SHRA, chance TSRA.

Wednesday Night: Mainly MVFR, with areas VFR possible. Breezy.
SHRA likely, isolated TSRA.

Thursday: Mainly MVFR, with areas VFR possible. Chance SHRA.

Thursday Night: VFR.

Friday:

MARINE
Forecaster Confidence Levels:

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

*** SCA remains in effect Sunday afternoon into Monday ***

Tonight...

Showers and thunderstorms likely tonight after 06z through 12z.
Winds continue to be strong out of the SW gusting up to 30 knots, possibly higher at times. Seas 5-10 feet.

Monday...

Showers and thunderstorms should move well out to sea by 12z.
Winds remain out of the SW and remain gusty to 25 knots. Seas 4-8 feet.

Monday Night...

Clear conditions with decreasing winds turning NW at 15-20 knots. Seas decrease to 3-6 feet.

Outlook /Tuesday through Friday/...

Tuesday through Tuesday Night: Winds less than 25 kt. Areas of seas approaching 5 ft.

Wednesday: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Seas up to 5 ft. Slight chance of rain showers.

Wednesday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Seas up to 5 ft. Chance of rain showers, isolated thunderstorms.

Thursday: Winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers.

Thursday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers.

Friday: Winds less than 25 kt.

BOX WATCHES/WARNINGS/ADVISORIES
CT...Heat Advisory until 7 PM EDT this evening for CTZ002>004.
MA...Heat Advisory until 7 PM EDT this evening for MAZ010-011.
High Surf Advisory until 7 PM EDT Monday for MAZ020>024.
RI...High Surf Advisory until 7 PM EDT Monday for RIZ006>008.
MARINE...Small Craft Advisory until 11 PM EDT this evening for ANZ230.
Small Craft Advisory until 8 AM EDT Monday for ANZ231.
Small Craft Advisory until 5 AM EDT Tuesday for ANZ232>235-237.
Small Craft Advisory until 9 AM EDT Monday for ANZ236.
Small Craft Advisory until 9 PM EDT Monday for ANZ250.
Small Craft Advisory until 5 AM EDT Monday for ANZ251.
Small Craft Advisory until 9 AM EDT Tuesday for ANZ254>256.




Weather Reporting Stations
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Stations Dist Age Wind AirWater WavesinHgDewPt
44020 - NANTUCKET SOUND 7 mi52 minSSW 23G29 72°F 71°F3 ft29.6271°F
44090 17 mi32 min 63°F3 ft
CHTM3 18 mi44 min 29.64
BZBM3 - 8447930 - Woods Hole, MA 22 mi44 min 69°F29.65
NTKM3 - 8449130 - Nantucket Island, MA 24 mi44 minSSW 12G17 73°F29.66
NBGM3 34 mi44 minWSW 16G24 29.64
44018 - SE Cape Cod 30NM East of Nantucket, MA 42 mi82 min 62°F3 ft
44085 43 mi32 min 70°F 63°F7 ft
BUZM3 - Buzzards Bay, MA 43 mi62 minSSW 28G30 71°F 29.62
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 48 mi44 minSSW 15G19 29.61
FRVM3 - 8447386 - Fall River, MA 48 mi44 min 71°F29.63
FRXM3 49 mi74 min 75°F 72°F


Wind History for Nantucket Island, MA
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Airport Reports
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Wind History graph: HYA
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Tide / Current for Hyannis Port, Nantucket Sound, Massachusetts
   
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Hyannis Port
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Sun -- 01:27 AM EDT     3.45 feet High Tide
Sun -- 05:07 AM EDT     Sunrise
Sun -- 06:15 AM EDT     Moonset
Sun -- 07:34 AM EDT     -0.26 feet Low Tide
Sun -- 02:13 PM EDT     2.95 feet High Tide
Sun -- 07:42 PM EDT     0.14 feet Low Tide
Sun -- 08:19 PM EDT     Sunset
Sun -- 10:19 PM EDT     Moonrise
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
3.1
1
am
3.4
2
am
3.4
3
am
3
4
am
2.2
5
am
1.3
6
am
0.4
7
am
-0.2
8
am
-0.2
9
am
0.2
10
am
0.9
11
am
1.5
12
pm
2.1
1
pm
2.7
2
pm
2.9
3
pm
2.8
4
pm
2.4
5
pm
1.6
6
pm
0.9
7
pm
0.3
8
pm
0.2
9
pm
0.6
10
pm
1.3
11
pm
2


Tide / Current for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
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Sun -- 01:26 AM EDT     -1.77 knots Max Ebb
Sun -- 04:33 AM EDT     0.00 knots Slack
Sun -- 05:06 AM EDT     Sunrise
Sun -- 06:14 AM EDT     Moonset
Sun -- 08:00 AM EDT     2.11 knots Max Flood
Sun -- 11:25 AM EDT     -0.00 knots Slack
Sun -- 02:01 PM EDT     -1.64 knots Max Ebb
Sun -- 05:07 PM EDT     0.00 knots Slack
Sun -- 08:15 PM EDT     1.69 knots Max Flood
Sun -- 08:17 PM EDT     Sunset
Sun -- 10:18 PM EDT     Moonrise
Sun -- 11:25 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Pollock Rip Channel, Massachusetts Current, knots
12
am
-1.2
1
am
-1.7
2
am
-1.7
3
am
-1.2
4
am
-0.5
5
am
0.4
6
am
1.3
7
am
1.9
8
am
2.1
9
am
1.9
10
am
1.4
11
am
0.5
12
pm
-0.6
1
pm
-1.4
2
pm
-1.6
3
pm
-1.4
4
pm
-0.9
5
pm
-0.1
6
pm
0.7
7
pm
1.4
8
pm
1.7
9
pm
1.6
10
pm
1.2
11
pm
0.4


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Boston, MA,




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