Monday, October25, 2021
Privacy Policy
L-36.com

Marine Weather and Tides
West Yarmouth, MA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:04AMSunset 5:46PM Monday October 25, 2021 3:10 PM EDT (19:10 UTC) Moonrise 8:49PMMoonset 11:53AM Illumination 77% Phase: Waning Gibbous; Moon at 20 days in cycle
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
    EDIT      (on/off)   Help
ANZ232 Nantucket Sound- 127 Pm Edt Mon Oct 25 2021
.small craft advisory in effect through Tuesday morning...
.storm watch in effect from Tuesday morning through Wednesday afternoon...
This afternoon..S winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of rain.
Tonight..SE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of rain.
Tue..E winds 20 to 25 kt with gusts up to 30 kt, becoming ne 25 to 35 kt with gusts up to 45 kt in the afternoon. Seas 4 to 7 ft. Patchy fog. Rain. Vsby 1 nm or less.
Tue night..NE winds 30 to 40 kt. Gusts up to 65 kt, decreasing to 50 kt after midnight. Seas 6 to 9 ft. Patchy fog. Rain. Vsby 1 nm or less.
Wed..NE winds around 30 kt with gusts up to 45 kt. Seas 5 to 8 ft. Showers.
Wed night..N winds 25 to 30 kt with gusts up to 45 kt, diminishing to 20 to 25 kt with gusts up to 30 kt after midnight. Seas 4 to 7 ft. Showers likely.
Thu..NE winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. A chance of showers.
Thu night..NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers.
Fri..E winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers.
Fri night..E winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 7 ft. Showers likely. 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 127 Pm Edt Mon Oct 25 2021
Synopsis for massachusetts and rhode island coastal waters.. A warm front tracks across the waters Monday. A gale center develops off the nc coast Monday night and then may evolve into a storm south of new england Tuesday, lingering into Wednesday then exiting out to sea. Weak ridge of high pressure builds over the waters Thu, then weak low pressure approaches late Fri and moves over new england Saturday. For additional information on possible hazardous weather for the week ahead, please visit www.weather.gov/boston/ehwo


7 Day Forecast for Marine Location Near West Yarmouth, MA
   Hourly   EDIT   Help
location: 41.6, -70.27     debug


Area Discussion for - Boston, MA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS61 KBOX 251750 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 150 PM EDT Mon Oct 25 2021

SYNOPSIS. Widespread steady rain will depart by mid to late morning, but a few showers and areas of patchy fog and drizzle will persist this afternoon. A developing strong coastal storm will bring the potential for heavy rain, flooding, and damaging winds Tuesday into Wednesday. Exact impacts will depend on the eventual storm track. Drier weather may return Thu/Fri before more unsettled weather returns next weekend.

NEAR TERM /UNTIL 6 PM THIS EVENING/. 150 PM update .

Low clouds and patchy drizzle and fog will persist this afternoon. Next batch of showers, some convective in nature, will approach the south coast toward 00z. Warm front along the south coast not expected to make any further north progress with temps remaining steady. Quite the temp gradient across SNE with temps around 70 along the south coast and in the mid/upper 40s interior high terrain.

Previous discussion .

Back edge of steady rainfall is exiting the region as mid level jet and best forcing lifts to the north with mid level dry slot moving into SNE. However, abundant low level moisture will lead to patchy light rain or drizzle at times with low clouds and patchy fog, especially over the higher terrain.

Warm front along the south coast may briefly reach as far north as PVD-TAN-PYM before sinking back to the south through the afternoon. Temps along the south coast and Cape/Islands expected to reach mid/upper 60s, but remaining in the 50s to the north of the boundary, with upper 40s interior MA high terrain.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM TUESDAY/. 430 AM update .

Monday night .

Mid level trough over the eastern Great Lakes and OH valley, amplifies and takes on a negative tilt as it advects toward southern New England. At the surface, the response will be for developing low pressure off the NC coast, to rapidly intensify as it lifts northward toward southern New England. This will result in rain redeveloping and overspreading the region from south to north. The combination of PWATs rising rapidly and elevated instability, isolated thunderstorms are possible, which will enhance the rainfall. Also, strengthening offshore low combined with 1030 mb high over southeast Canada, will result increasing pressure gradient and ENE winds ramping up toward daybreak.

Tuesday .

*** Heavy rain, flooding and strong to damaging winds ***

Rapidly deepening closed low south of New England will bring multiple facet storm to impact the our region Tue. Uncertainty is centered around the exact track of the closed low and its wind and moisture anomalies.

Heavy Rain/Flood Potential .

Anomalous wind and moisture anomalies with closed vertically stacked low south of New England will bring very heavy rainfall to MA/RI/CT Tue. HREF offering low probs of 2-3" rainfall in 6 hrs 18z Tue to 00z Wed. Heavy rain will begin to overspread the region in the morning from SSW to NNE, with heavy rain likely impacting the entire region for the late day commute. Given this strong heavy rain signal we issued a flood watch for much of the region. Heaviest rainfall likely will be across the hilly terrain of CT/RI and into the Worcester Hills, as strong ENE inflow provides upslope rainfall enhancement. Some uncertainty if heavy rainfall tracks into NW MA, thus left this area out of the watch for now.

Strong to Damaging Wind Potential .

All model guidance has strong low level ENE wind anomaly pivoting into SNE Tue, ranging from 55 kt to 75 kt depending on model of choice. Model soundings support 50-60 mph winds possible across RI and eastern MA, with 60-70 mph gusts possible Cape Cod and Islands. Thus we continued the high wind watch. Wind damage may overachieve given trees remain fully leaved. Hence, power outages are possible.

LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/. Highlights .

* Heavy rain, potential flooding, coastal erosion, and damaging winds possible Tuesday night into Wednesday

* Drier Thu/Fri before unsettled weather returns next weekend

* Seasonable temperatures continue

Details .

Tuesday night and Wednesday .

A highly amplified intermountain west trough-midwest ridge-northeast trough pattern persists into Tuesday night with a rex block over our region. Wednesday the upper low finally kicks out as the surface low center exits to the east. Before it's gone the copious moisture and strong forcing associated with that lingering system will bring an additional 1-2 inches of rain to portions of southern New England along with strong, damaging winds. Where the heaviest rain and strongest winds materialize will be dependent on even small wobbles in the track of the low. That will determine where the moisture and wind anomalies are. What we have more confidence in is that heavy rain is in store, as are strong winds. Ensemble guidance continues to hammer southern New England with 3-5 inches of rain (mean value). Though the GEFS is less robust than the EPS, the wetter EPS solution does have support from other guidance. Given at least 50% confidence that we'll see rainfall amounts capable of producing some urban/poor drainage/small stream flooding, a Flood Watch is in effect for most off southern New England. Clogged storm drains from recently fallen leaves have the potential to exacerbate flooding issues.

Winds look to be ramping up and peaking overnight Tuesday as that impressive 60-70 kt 925 mb jet moves over the region. Best chance of the strongest winds will be southeast Massachusetts and Rhode Island, though if the track of the storm shifts that is subject to change. BUFKIT soundings show anywhere from 45 to 65 kts at the top of the mixed layer Tuesday night deepening on how pronounced a 850 mb warm nose is. For now will stick with a forecast of generally max gusts to 60 mph, best chances over the Cape and Islands. This is capable of producing damage, especially given the relative abundance of leaves still left on our trees.

As for coastal flooding and erosion, low astronomical tides will aid in minimizing impacts. However, the sheer duration of this event in which the high N/NE winds could span 4 high tide cycles will increase likelihood of some minor coastal flooding issues in the typical spots; coastal erosion will likely be a bigger concern.

Thursday through the weekend .

Guidance has remained consistent in showing the mid level low beginning its exit, replaced by a ridge of high pressure on Thursday into Friday. This will bring mostly dry conditions, though the pressure gradient is slow to relax, so high winds likely linger, especially for the southeast coast and offshore waters Thursday. Another upper level low moves out of the midwest into New England around Friday/Saturday which will bring the return of rain chances as early as Friday evening, with a wet and unsettled weekend ahead.

AVIATION /18Z MONDAY THROUGH SATURDAY/. Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent.

18Z TAF Update .

Through 00z . Widespread IFR/LIFR in stratus and patchy drizzle/fog.

Tonight . High confidence.

IFR/LIFR across much of the region except areas of MVFR/VFR over the Cape/Islands. Increasing coverage of showers from the ocean lift south to north across SNE after 00z. Some of the showers may be locally heavy with low risk of thunder.

Tuesday and Tuesday night . High confidence.

Widespread IFR/LIFR. Periods of rain, heavy at times especially in the afternoon through the night. Increasing NE winds during the afternoon, with winds peaking Tue night with gusts 50-60 kt east coastal MA and Cape/Islands, 40-50 kt back to I-95 corridor and 25-35 kt CT valley. LLWS across SE MA and Cape Cod Tue night.

KBOS Terminal . High confidence in TAF trends.

KBDL Terminal . High confidence in TAF trends.

Outlook /Wednesday through Friday/ .

Wednesday: Mainly VFR, with local IFR possible. Strong winds with gusts up to 45 kt. Chance SHRA.

Wednesday Night: Mainly VFR, with local MVFR possible. Windy with gusts up to 35 kt. Chance SHRA.

Thursday: VFR. Windy with local gusts up to 30 kt. Slight chance SHRA.

Thursday Night: Mainly VFR, with local MVFR possible. Breezy.

Friday: Mainly VFR, with areas MVFR possible. Breezy. Slight chance SHRA.

MARINE. Forecaster Confidence Levels.

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

*** Storm Watch Remains in Effect ***

Today .

Warm front draped across the region, with SSW winds across the southern MA/RI waters, and ENE winds over northern MA waters. Vsby reduced in steady rain this morning, then patchy fog and drizzle this afternoon.

Tonight .

Low pres develops off the NC coast, then intensifies and move north toward SNE. ENE winds increase 20-30 kt toward daybreak Tue. Rain becomes widespread as the night progresses. Vsby reduced at times in rain and fog.

Tuesday .

Gale Center south of New England may intensity into a storm with NE winds 25 to 35 kt gusting up to 60 kt possible. Heavy rain reduces vsby. Dangerous seas develop, peaking 20-25 kt east of Nantucket and Cape Cod!

Outlook /Tuesday Night through Friday/ .

Tuesday Night: gale force winds with gusts up to 45 kt. Rough seas up to 25 ft. Rain showers.

Wednesday: gale force winds with gusts up to 45 kt. Rough seas up to 22 ft. Rain showers likely.

Wednesday Night: Strong winds with gusts up to 35 kt. Rough seas up to 18 ft. Chance of rain showers.

Thursday: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 12 ft. Chance of rain showers.

Thursday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Slight chance of rain showers.

Friday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 13 ft. Slight chance of rain showers.

TIDES/COASTAL FLOODING. *** Minor Coastal Flooding with moderate erasion possible ***

Strong coastal storm develops south of New England Tuesday and given its slow movement, likely lingers into Wed. Thankfully astro tides are low but strong onshore winds for two days over multiple tide cycles will result in a storm surge of 2 to 3 ft. Low astro tides likely limit coastal flooding to minor but multiple tide cycles impacted may result in moderate erosion.

BOX WATCHES/WARNINGS/ADVISORIES. CT . Flood Watch from late tonight through Wednesday evening for CTZ002>004. MA . Flood Watch from late tonight through Wednesday evening for MAZ003>021-026. High Wind Watch from Tuesday morning through Wednesday afternoon for MAZ007-013>024. RI . Flood Watch from late tonight through Wednesday evening for RIZ001>008. High Wind Watch from Tuesday morning through Wednesday afternoon for RIZ001>008. MARINE . Storm Watch from Tuesday morning through Wednesday afternoon for ANZ230>237-250-251-254>256. Small Craft Advisory until 8 AM EDT Tuesday for ANZ231>235-237- 250-251-254>256.

SYNOPSIS . Nocera/BW NEAR TERM . KJC SHORT TERM . Nocera LONG TERM . BW AVIATION . KJC/BW MARINE . Nocera/BW TIDES/COASTAL FLOODING .


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 7 mi31 min SSW 14G16 66°F 63°F1014.1 hPa
WAXM3 - Waquoit Bay Reserve, MA 14 mi86 min SSE 2.9 73°F 1014 hPa70°F
44090 17 mi45 min 61°F1 ft
CHTM3 18 mi53 min S 6G8 64°F 58°F1014.2 hPa
BZBM3 - 8447930 - Woods Hole, MA 22 mi53 min 69°F 64°F1014.2 hPa
NTKM3 - 8449130 - Nantucket Island, MA 24 mi53 min SSW 8G15 68°F 61°F1014.7 hPa
BUZM3 - Buzzards Bay, MA 43 mi71 min SSW 18G20 1014.7 hPa (-2.3)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 48 mi53 min WNW 4.1G5.1 64°F 1014.4 hPa
FRVM3 - 8447386 - Fall River, MA 48 mi53 min 64°F 64°F1014.9 hPa
FRXM3 49 mi53 min 62°F 62°F

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
Last
24hr
W12
G15
W5
G13
W6
W4
W3
W2
G5
W2
SW2
SW2
SW1
SW2
--
N1
E4
E4
SE5
SE6
G12
SE8
G12
SE8
G12
SE10
G17
SE6
G11
SE5
G10
S9
G15
S8
G12
1 day
ago
N6
N4
G7
NW3
W3
W3
W4
G8
NW8
G13
NW8
G12
NW7
G13
NW7
G11
NW8
G15
NW10
G14
NW8
G12
NW7
G10
NW7
G10
NW8
G13
NW9
G14
NW8
G15
NW9
G13
NW11
G17
NW10
G14
NW6
G11
NW7
G12
W7
G13
2 days
ago
SW7
G11
SW7
G11
SW7
G11
SW6
G10
SW6
G10
SW4
G7
SW5
G8
SW4
G7
SW3
G6
SW3
SW2
N5
G11
N6
G9
N8
N7
N4
G9
N7
N5
G9
N5
G8
NW5
G10
NW7
G10
N8
G11
NW5
G13
N6
G11

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA6 mi15 minSSW 1110.00 miMostly Cloudy69°F65°F87%1014 hPa
Otis Air National Guard Base, MA14 mi26 minSSW 15 G 2310.00 miMostly Cloudy70°F64°F83%1014.2 hPa
Chatham, Chatham Municipal Airport, MA16 mi19 minSW 610.00 miOvercast66°F63°F90%1014.9 hPa
Marthas Vineyard Airport, MA23 mi18 minSSW 11 G 2010.00 miA Few Clouds69°F65°F87%1014.3 hPa

Link to 5 minute data for KHYA

Wind History from HYA (wind in knots)
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
Last 24hrW11W8SW7SW500000000000E4SE4SE10
G15
SE6SE746S6S10
G17
1 day agoN7N5N400W3NW4NW4NW7W4W4NW5W4NW4NW4NW5W5NW5NW9NW11
G17
NW9
G15
NW80W7
G15
2 days agoSW15
G25
SW13SW11SW8SW8SW11SW700N4N5N6N4N5NW4N7N7N6N6NW10N9N12N7
G16
NE6

Tide / Current Tables for Hyannis Port, Nantucket Sound, Massachusetts
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Hyannis Port
Click for Map
Mon -- 03:58 AM EDT     2.82 feet High Tide
Mon -- 07:05 AM EDT     Sunrise
Mon -- 09:25 AM EDT     0.41 feet Low Tide
Mon -- 11:53 AM EDT     Moonset
Mon -- 04:00 PM EDT     3.05 feet High Tide
Mon -- 05:44 PM EDT     Sunset
Mon -- 08:48 PM EDT     Moonrise
Mon -- 09:59 PM EDT     0.15 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1.2
1
am
1.7
2
am
2.2
3
am
2.7
4
am
2.8
5
am
2.6
6
am
2.1
7
am
1.5
8
am
0.9
9
am
0.5
10
am
0.5
11
am
1
12
pm
1.5
1
pm
2
2
pm
2.5
3
pm
2.9
4
pm
3.1
5
pm
2.9
6
pm
2.4
7
pm
1.7
8
pm
1
9
pm
0.4
10
pm
0.1
11
pm
0.4


Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
   EDIT      (on/off)   Help   One Week of Data
Pollock Rip Channel
Click for Map
Mon -- 01:15 AM EDT     -0.00 knots Slack
Mon -- 03:50 AM EDT     -1.51 knots Max Ebb
Mon -- 06:58 AM EDT     0.00 knots Slack
Mon -- 07:03 AM EDT     Sunrise
Mon -- 10:13 AM EDT     1.59 knots Max Flood
Mon -- 11:52 AM EDT     Moonset
Mon -- 01:23 PM EDT     -0.00 knots Slack
Mon -- 04:02 PM EDT     -1.56 knots Max Ebb
Mon -- 05:43 PM EDT     Sunset
Mon -- 07:10 PM EDT     0.00 knots Slack
Mon -- 08:47 PM EDT     Moonrise
Mon -- 10:38 PM EDT     1.83 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1.2
1
am
0.3
2
am
-0.7
3
am
-1.3
4
am
-1.5
5
am
-1.3
6
am
-0.7
7
am
0
8
am
0.8
9
am
1.4
10
am
1.6
11
am
1.5
12
pm
1.1
1
pm
0.4
2
pm
-0.6
3
pm
-1.3
4
pm
-1.6
5
pm
-1.4
6
pm
-0.9
7
pm
-0.1
8
pm
0.7
9
pm
1.4
10
pm
1.8
11
pm
1.8


Weather Map
       (on/off)   Help Weather Map
wmap_A
GEOS Local Image of    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
Link to Loop

Other links: GEOS-West     Contential US     Full GOES-East
Ground Weather Radar Station




Please read website Cookie, Privacy, and Disclamers by clicking HERE.