Friday, April3, 2020
Privacy Policy
L-36.com


Marine Weather and Tides
West Yarmouth, MA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:18AMSunset 7:10PM Friday April 3, 2020 6:58 AM EDT (10:58 UTC) Moonrise 1:45PMMoonset 3:56AM Illumination 79% Phase: Waxing Gibbous; Moon at 10 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- 416 Am Edt Fri Apr 3 2020
.storm warning in effect through this afternoon...
Today..NE winds 25 to 30 kt with gusts up to 50 kt. Seas 5 to 8 ft. Patchy fog. Rain. Vsby 1 to 3 nm.
Tonight..NE winds 25 to 30 kt, diminishing to 20 to 25 kt after midnight. Gusts up to 45 kt. Seas 4 to 7 ft. Patchy fog. Rain likely. Vsby 1 to 3 nm.
Sat..NE winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 35 kt. Seas 3 to 5 ft. A chance of showers.
Sat night..NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft.
Sun and Sun night..SW winds 5 to 10 kt. Seas 2 to 4 ft.
Mon through Tue..SW winds 5 to 10 kt. Seas 2 to 4 ft.
Tue night..E winds 5 to 10 kt. Seas 2 to 3 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.
ANZ200 416 Am Edt Fri Apr 3 2020
Synopsis for massachusetts and rhode island coastal waters.. A large and intense ocean storm well east of the waters will gradually pinwheel back toward the coast through Friday morning. This storm will bring gale to storm force winds to the waters along with rough seas. The system will move south and away from the waters off the shore of southern new england Friday night. Weak high pressure will then build back over the waters this weekend. For information on possible hazardous weather beyond the 24-36 hour forecast period, please visit www.weather.gov/boston and follow the current hazards link above the map on the left.


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 030837 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 437 AM EDT Fri Apr 3 2020

SYNOPSIS. A large and intense ocean storm east of New England will begin to move south today before passing north of Bermuda Saturday. This storm will bring strong to damaging winds, coastal flooding and locally heavy rainfall to east coastal Massachusetts and the Cape and Islands today. Occasional rain persists tonight in eastern New England before diminishing Saturday. A weak weather system and front will bring scattered showers Sunday afternoon and night. Unsettled conditions will linger as a few fast moving systems push across the region from Monday night through mid week.

NEAR TERM /UNTIL 6 PM THIS EVENING/. Large ocean storm moving west will begin to turn south and make its closest approach to Nantucket this morning, passing just E of the 40N/70W benchmark then continuing south through today.

60 kt low level jet north of the low will push south from the Gulf of Maine and impact eastern MA today. The core of the jet arrives this morning and persists into the afternoon. Boundary layer is shallow but sufficiently mixed to support max gusts to 60 mph from Cape Ann to the outer Cape and Nantucket, with up to 50 mph gusts across rest of east coastal MA. We expanded the high wind warning to include Cape Ann which will be in the core of this jet, and also expanded the wind advisory from Boston south to western Plymouth county. Less wind further west, 30-40 mph along and west of I-95.

Bands of rain will continue to rotate west across SNE today, but will be focused across eastern MA within the core of the low level jet, with improving conditions developing in the CT valley this afternoon.

See coastal flooding section below for a discussion of coastal flood potential.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SATURDAY/. Tonight .

Storm moves well south of New Eng tonight while SNE remains within the cyclonic circulation. The low level jet weakens but the core of the jet will remain focused across eastern MA where deep moisture persists. As a result, expect occasional rain to continue at times across eastern MA. Hi-res guidance suggests potential for total rainfall of 1-2 inches focused from Plymouth county to Cape Cod.

Winds will slowly diminish as the jet weakens but still a windy night along the coast. Gusts 35-45 mph along the immediate coast gradually diminishing overnight.

Saturday .

Cyclonic NE flow near the coast and persistent moisture will continue the risk of showers across eastern MA, but improving conditions in the afternoon. Lots of low level moisture will result in low clouds persisting, but should become partly sunny in the CT valley. Winds still gusty along the coast in the morning but diminishing in the afternoon as low level wind field weakens and moves to the south. Highs ranging from the lower 40s east coastal MA to low/mid 50s CT valley.

LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/.

Highlights .

* Dry conditions expected Saturday night into Sunday morning as high pressure moves across

* A weak disturbance and associated cold front will bring scattered showers Sunday afternoon and night

* Dry and mild conditions briefly return on Monday, then will cool to near or slightly below normal cooling through mid week

* A few fast moving systems may bring unsettled conditions from Monday night through mid week

Details .

Saturday night through Sunday night .

As the ocean storm finally shifts E-SE across the western Atlc, expect dry conditions into Sunday. Will still see gusty NE winds up to 20 to 30 mph lingering across Cape Cod and along the S coast Saturday evening, then will diminish as the pressure gradient relaxes and winds become light northerly mainly around and after midnight. Will still see a layer of low to mid level moisture linger as seen on 00Z NAM/GFS BUFKIT soundings, so expect mostly cloudy skies but should remain dry at ground level.

Will see colder air aloft shift southward during the night, with H85 temps down to -2C to -4C after midnight. Expect temp to bottom out manly in the 30s, though could be close to 40 across the lower CT valley.

High pressure ridge will cross the region on Sunday, though may still see low level moisture and clouds will linger across the interior. May see another weak system approach during the day, which may bring some isolated showers as suggested by the 00Z GFS BUFKIT. Have limited any POPs to slight chance mainly across the higher terrain of N central and W Mass. May see a better shot for showers Sunday night as a cold front approaches. Several 00Z model members suggest that the mid level steering flow will become more progressive, so the front should push steadily across Sunday night,

Monday .

00Z model members continue to signal a dry and mild day for Monday as another high pressure center crosses the northeast during the day. As clouds move offshore through the morning, should see quite a bit of sunshine as well. Expect H925 temps to rise to +5c to +7C during the afternoon, so should see temps rise to the lower 60s across interior E Mass and N central/NE CT to the CT valley, but will be cooler along the coast and across the higher terrain.

Tuesday through Thursday .

Lower than average confidence during this timeframe as the fast moving, progressive mid level steering flow remains across the lower 48. Noting rather wide model solution spread amongst the model suite as a few systems push across.

High pressure will push E through Tuesday, then another frontal system approaches as a cutoff H5 low dives SE out of central Canada. This flow may linger through Thursday with a few more systems moving across keeping unsettled conditions in place. Temperatures should run close to or slightly below normal during this timeframe.

AVIATION /09Z FRIDAY THROUGH TUESDAY/. Forecaster Confidence Levels .

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

Through 12z . Mainly MVFR with areas of IFR Cape Cod. VFR cigs CT valley will trend toward MVFR. Bands of rain rotating west across the region, focused across eastern New Eng. N wind gusts increasing to 40-45 kt by 12z outer Cape and ACK.

Today . Moderate confidence. MVFR/IFR conditions in periods of rain, focused across eastern half New Eng. MVFR/VFR cigs CT valley. NE gusts 35-45 kt east coastal MA with up to 50 kt outer Cape Cod and Cape Ann. 25-35 kt gusts along and west of I-95.

Tonight . Moderate confidence. Widespread MVFR/IFR. Occasional rain eastern New Eng gradually diminishing. NE gusts 30-40 kt in the evening, gradually diminishing overnight.

Saturday . Moderate confidence. MVFR/IFR to start gradually improving during the afternoon with VFR developing in the CT valley. Threat of showers persisting across eastern and SE MA. NE gusts 25-30 kt along the coast diminishing in the afternoon.

KBOS Terminal . Moderate confidence. Mainly MVFR cigs but may drop to IFR at times. NE gusts peak around 40 kt today.

KBDL Terminal . Moderate confidence. Cigs lowering to MVFR.

Outlook /Saturday Night through Tuesday/ .

Saturday Night: Mainly VFR, with local IFR possible. Breezy.

Sunday: Mainly VFR, with areas MVFR possible.

Sunday Night: Mainly VFR, with local MVFR possible. Breezy. Slight chance SHRA.

Monday through Monday Night: VFR.

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

MARINE. Peak of the wind from large ocean storm occurs today as low level jet moves south from the Gulf of Maine. NE gusts to 50 kt eastern waters and gusts to 40 kt RI coastal waters. Seas build to 15-25 ft over eastern MA waters. Expanded the storm warning to Mass Bay which will be in the core of the low level jet. Winds gradually diminish tonight and Saturday but it will be a slow process with gales persisting on waters tonight then dropping to SCA during Sat from north to south. Vsbys reduced in occasional rain and fog, improving Sat.

Outlook /Saturday Night through Tuesday/ .

Saturday Night: Winds less than 25 kt. Rough seas up to 11 ft.

Sunday: Winds less than 25 kt. Areas of rough seas.

Sunday Night: Winds less than 25 kt. Areas of rough seas. Slight chance of rain showers.

Monday: Winds less than 25 kt. Local rough seas.

Monday Night: Winds less than 25 kt. Seas up to 5 ft.

Tuesday: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers.

TIDES/COASTAL FLOODING.

Today .

Powerful low pressure (~ 976 mb) over Georges Bank this morning continues moving west bound, making its closest pass to Nantucket around 8 am this morning, about 100 miles east of the Island. The low will then move southwest tracking near the 40N/70W benchmark this afternoon and then finally southeast out to sea. Strong low level northeast jet associated with this low is currently over the northern ME waters with Mt. Desert Rock reporting a peak wind (NNE) at 56 kt/64 mph at 2 AM! This core of strong NNE winds will coincide with this morning's high tide in eastern MA (730-830am). Thus expecting wind gusts approaching 60 mph along the eastern MA coastline during high tide. This will result in about a 3-3.5 ft storm surge. At 3 AM, already seeing observed surge values of 2.85-2.95.

As for surge model guidance, ESTOFS remains unusable as for whatever reason this model is just not capturing current surge values. ETSS is fairly good with current surge values only running about 0.5 lower than observed values. Stevens Institute ensemble surge SNAP-Ex almost spot when comparing observed surge values to ensemble mean forecast. Thus will continue to follow this guidance very closely. This supports storm surge values ranging from about 2.8 ft to 3.2 ft during this morning's high tide. This brings storm tides (total water level) to about 6.4 ft at Nantucket (flood stage 5 ft) and Boston to 12.5 (flood stage 12.5 ft). These water levels at or above flood stage combined with large waves of 15-20 ft just offshore (up to 25 ft farther offshore) will be sufficient for widespread minor coastal flooding along the entire eastern MA coastline from the NH/MA border southward to Boston to Cape Cod and the Islands. Embedded areas of moderate coastal flooding are possible as these retrograding lows combined with higher period waves from a long NE fetch sometimes result in a greater impact. This includes possible minor structural damage to seawalls and other coastal structures along with minor to moderate beach erosion.

Tonight and Saturday .

Despite the ocean storm moving away from the region later today the following two tide cycles tonight and Saturday morning may experience minor coastal flooding. Thus later today a coastal flood advisory may be needed for these two tide cycles.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . Coastal Flood Warning until 10 AM EDT this morning for MAZ007- 015-016-019-022>024. Wind Advisory until 8 PM EDT this evening for MAZ015-016-018- 019-021. High Wind Warning until 5 PM EDT this afternoon for MAZ007. High Wind Warning until 8 PM EDT this evening for MAZ022>024. RI . None. MARINE . Storm Warning until 5 PM EDT this afternoon for ANZ231-232-251- 255. Gale Warning until 8 AM EDT Saturday for ANZ233>235-237. Gale Warning until 2 AM EDT Saturday for ANZ230. Gale Warning until 8 PM EDT this evening for ANZ236. Storm Warning until 8 PM EDT this evening for ANZ250-254. Gale Warning until 9 AM EDT Saturday for ANZ256.

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


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 mi139 min 5 ft
WAXM3 - Waquoit Bay Reserve, MA 14 mi74 min WNW 11 44°F 994 hPa43°F
44090 17 mi59 min 43°F6 ft
BZBM3 - 8447930 - Woods Hole, MA 22 mi59 min 44°F 44°F994.3 hPa (-0.0)
NTKM3 - 8449130 - Nantucket Island, MA 24 mi59 min N 19 G 27 43°F 44°F992 hPa (-0.4)
44018 - SE Cape Cod 30NM East of Nantucket, MA 42 mi69 min N 29 G 35 43°F 17 ft992.8 hPa (-0.3)41°F
BUZM3 - Buzzards Bay, MA 43 mi59 min N 27 G 30 995.4 hPa (+0.0)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 48 mi59 min N 15 G 20 44°F 996.5 hPa (+0.5)
FRVM3 - 8447386 - Fall River, MA 48 mi59 min 44°F 44°F996.7 hPa (+0.4)
FRXM3 49 mi59 min 44°F 42°F

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
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
Last
24hr
N17
G26
N14
G23
N13
G23
N18
G26
N17
G25
N17
G25
N16
G24
N17
G27
NW18
G25
NW17
G24
NW18
G25
NW20
G25
NW15
G24
NW15
G24
NW16
G27
N18
G27
N19
G28
N19
G26
N19
G26
N17
G27
N19
G28
N18
G26
N17
G25
N19
G27
1 day
ago
NE14
G20
NE15
G21
NE16
G22
N10
G20
NE14
G20
NE12
G21
N13
G22
N13
G20
N17
G25
N14
G25
N14
G23
N20
G25
N18
G26
N18
G26
N18
G22
N20
G27
N15
G25
N17
G23
N17
G23
N17
G26
N18
G23
N17
G28
N16
G25
N14
G24
2 days
ago
NE15
NE12
G19
N14
G23
NE13
G19
N13
G20
N7
G14
NE9
G16
NE9
G17
NE10
G13
N11
G16
N13
G18
NE13
G16
N10
G18
NE12
G15
NE12
G16
NE11
G16
NE11
G14
NE9
G14
NE10
G14
NE10
G15
NE10
G16
NE7
G11
NE11
G17
NE13
G18

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 mi63 minN 16 G 283.00 miLight Rain Fog/Mist45°F42°F90%992.7 hPa
Otis Air National Guard Base, MA14 mi74 minNNW 23 G 333.00 miRain and Windy43°F42°F100%994.2 hPa
Chatham, Chatham Municipal Airport, MA16 mi67 minN 12 G 202.00 miLight Rain Fog/Mist44°F41°F89%992.9 hPa
Marthas Vineyard Airport, MA23 mi66 minN 20 G 286.00 miRain Fog/Mist and Breezy45°F42°F90%993.7 hPa

Link to 5 minute data for KHYA

Wind History from HYA (wind in knots)
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
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
Last 24hrN15
G28
N15
G26
NW14
G26
N17
G28
NW15
G31
N15
G26
N16
G26
N15
G23
NW15
G28
NW16
G27
--------N18
G25
NW19
G31
N18
G33
N20
G31
N17
G29
N18
G29
N19
G29
N21
G31
N20
G32
N16
G28
1 day agoNE9
G14
N13
G21
N11
G20
N15
G26
N11
G21
N15
G24
N18
G26
N16
G24
N15
G29
N19
G26
N17
G28
N14
G28
N16
G25
N16
G29
N15
G24
N15
G30
N18
G27
N18
G27
N18
G27
N14
G25
N15
G29
N16
G26
N20
G29
N19
G32
2 days agoN8
G19
NE12
G19
NE13
G20
NE16
G23
N14
G21
N12
G20
NE14
G21
N13
G19
N8
G15
N12
G19
NE11NE13
G19
NE9--NE6CalmCalmCalmCalmCalmCalmCalmN6NE5

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
Fri -- 01:50 AM EDT     0.36 feet Low Tide
Fri -- 03:56 AM EDT     Moonset
Fri -- 06:20 AM EDT     Sunrise
Fri -- 08:28 AM EDT     3.07 feet High Tide
Fri -- 01:44 PM EDT     Moonrise
Fri -- 02:32 PM EDT     0.02 feet Low Tide
Fri -- 07:09 PM EDT     Sunset
Fri -- 09:16 PM EDT     2.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
10.50.40.71.31.82.32.8332.72.11.30.60.10.10.511.62.12.62.82.72.3

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
   EDIT      (on/off)   Help   One Week of Data
Pollock Rip Channel
Click for Map
Fri -- 02:43 AM EDT     1.48 knots Max Flood
Fri -- 03:54 AM EDT     Moonset
Fri -- 05:55 AM EDT     -0.00 knots Slack
Fri -- 06:18 AM EDT     Sunrise
Fri -- 08:34 AM EDT     -1.49 knots Max Ebb
Fri -- 11:43 AM EDT     0.00 knots Slack
Fri -- 01:43 PM EDT     Moonrise
Fri -- 03:17 PM EDT     1.83 knots Max Flood
Fri -- 06:38 PM EDT     -0.00 knots Slack
Fri -- 07:08 PM EDT     Sunset
Fri -- 09:15 PM EDT     -1.49 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.41.11.41.51.30.7-0.1-0.9-1.4-1.5-1.1-0.50.211.61.81.81.40.6-0.4-1.1-1.5-1.4-1

Weather Map
       (on/off)   Help Weather Map
wmap_A
GEOS Local Image of Northeast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (6,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Boston, MA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

Cookie Policy:
This website uses cookies to save your settings. No personal information is saved. I do not collect statistics on your visit. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. The only personal information I save is in the site log which has a line for each page view which includes the IP address your browser sends in the header as well as which page you requested. I use this to block hackers and other bad actors. I do not use this raw data to create profiles on users. I periodically delete the log files. If you are subject to CCPA, Google ads on this site will not be based on your past behavior so you will likely not see an ad for a lawn mower just because you looked for one at a big box website. I do not believe this site is subject to CCPA but I am doing what I can to follow the guidelines anyway.
Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.