Friday, June22, 2018 L-36.com


Marine Weather and Tides
South Yarmouth, MA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:05AMSunset 8:20PM Friday June 22, 2018 6:59 AM EDT (10:59 UTC) Moonrise 3:00PMMoonset 1:56AM Illumination 66% Phase: Waxing Gibbous; Moon at 9 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
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ANZ232 Nantucket Sound- 338 Am Edt Fri Jun 22 2018
Today..E winds 5 to 10 kt with gusts up to 20 kt. Seas around 2 ft. Patchy fog this morning with vsby 1 to 3 nm.
Tonight..E winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers.
Sat..E winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 nm or less.
Sat night..S winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Showers likely. Vsby 1 nm or less.
Sun..SW winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. A chance of showers. Vsby 1 nm or less.
Sun night..W winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 nm or less.
Mon..N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Mon night..N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Tue..W winds 5 to 10 kt. Seas 2 to 3 ft.
Tue night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. 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 338 Am Edt Fri Jun 22 2018
Synopsis for massachusetts and rhode island coastal waters.. High pres builds across the waters through tonight. Low pres and an associated warm front will approach late tonight, bringing showers into Sat night. Showers will linger on Sunday as a cold front pushes across, reaching the coast early Mon. Scattered showers could persist into Mon as an upper level disturbance moves overhead. High pres moves in Mon night and Tue. 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 South Yarmouth, MA
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location: 41.64, -70.2     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 220825
afdbox
area forecast discussion
national weather service boston norton ma
425 am edt Fri jun 22 2018

Synopsis
A cold front will push off the south coast of new england this
morning, bringing dry and seasonable conditions as high pressure
builds across. Patchy fog may redevelop along south coastal
areas tonight. Unsettled weather is expected at times this
weekend, especially on Sunday, when the greatest risk for wet
weather should be. Dry with seasonable summer temperatures
should return by Monday or Monday night, depending on timing of
a cold front. Seasonable warmth with dry weather expected both
Tuesday and Wednesday.

Near term until 6 pm this evening
Dewpts have been steadily lowering over the last few hours
across central and southern areas as the cold front pushes s
early this morning. Noting dewpt readings down to the 40s across
the ct valley into N central and NE mass at 07z, while they
remain in the lower 60s along S coastal areas where fog lingers.

However, latest trends on the goes-east night fog product
showing the drier air working in as light n-ne winds develop.

Goes-east night fog and rgb nighttime microphysics products as
well as observations signaling clear skies from about the route
44 area northward. Expect temps to bottom out from the mid and
upper 40s across N central and NW mass as well as the normally
cooler valley locations to near 60 in the urban centers.

As for today, high pressure will build south out of southern
quebec through northern new england today. This will allow e-ne
winds to freshen across south coastal areas and the nearby
waters as the pres gradient gradually increases between the high
and low pressure across the mid atlc states into the ohio
valley.

Clouds may linger along the S coast through midday before moving
offshore. Expect mostly sunny conditions with temps recovering
to the mid 70s to around 80 away from the E coast where onshore
winds will keep temps cooler, mainly in the mid 60s on the outer
cape to around 70 from marshfield to boston and beverly.

Short term 6 pm this evening through 6 pm Saturday
Tonight...

the high across maine into the maritimes will hold in place
through most of the night. Winds will shift to se, which will
keep low level moisture working in across coastal areas. May see
patchy fog redevelop across S coastal areas overnight.

With the ridge axis remaining across the region, some question
as to whether any showers may move in after midnight. 00z models
have varying timing with the onset of the precip as low
pressure shifts E into ohio W pa overnight. Have carried chc
pops overnight tonight, but lower than average confidence due to
widened model solution timing.

Saturday...

the e-w oriented ridge pushes eastward early Saturday. Most
models signaling rain through the day. The ECMWF and canadian
ggem trying to bring in some bands of heavier rainfall along
with some instability, with k indices in the lower-mid 30s and
slis lower to below zero mainly near and S of the mass pike sat
afternoon. However, a continued e-se wind flow off the cooler
ocean waters should be a stabilizing influence so did not
mention thunder at this point. Temps will be around 10 degrees
below seasonal normals, only reaching the mid 60s to lower 70s.

Long term Saturday night through Thursday
Highlights...

* warmer with scattered showers thunderstorms on Sunday
* mainly dry with seasonable summer warmth Tue and wed
* more showers possible towards the end of next week
details...

Saturday night...

low pressure moving from the great lakes across northern new
england should push a cold front through southern new england
late. Scattered showers, with a few thunderstorms, remain
possible.

Sunday...

the greatest risk for showers and thunderstorms remains Sunday,
ahead of a secondary cold front. Amount of forecast instability
does not appear to be substantial, but mid level lapse rates
could be decent. Will need to monitor changes to thunderstorm
potential Sunday.

Monday...

impressive cold pool aloft shortwave passes by our region. Gfs
is the most aggressive lingering lift and moisture behind a
cold front. ECMWF and canadian quite a bit drier, but consistent
with prior runs. It's still really a question of how quickly
the drier air arrives behind a secondary cold front. Given the
proximity of a cold pool aloft, will keep at least a mention of
lingering showers early.

Tuesday through Thursday...

high pressure passing to our south will keep our weather mainly dry
Tuesday and Wednesday. An approaching warm front could bring a
few showers by Thursday.

Aviation 08z Friday through Tuesday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Saturday ... High confidence.

Through 12z... Patchy fog with MVFR-ifr CIGS vsbys along s
coastal terminals. May see local lifr vsbys across the outer
cape and islands. Otherwise,VFR conditions.

Today... MVFR-ifr conditions may linger across the outer CAPE and
immediate S coast until around 13z before improving, though low
clouds may linger near kack through mid morning or so.

Otherwise, expectVFR conditions.

Tonight... Patchy fog may skirt near kack, kmvy and kbid
overnight with local MVFR-ifr conditions at times. Otherwise,
vfr. Scattered -shra may move into the S coast after 06z, then
move steadily n-ne to about the mass pike by 12z.

Saturday... Scattered -shra continue across the region with
mainlyVFR conditions. Patchy fog may bring MVFR-ifr CIGS vsbys
along the S coast through most of the day, slowly pushing n
across ri SE mass after 18z.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Saturday night through Tuesday ... Moderate confidence.

Saturday night: mainly ifr, with local MVFR possible. Chance
shra, isolated tsra, patchy fg.

Sunday: mainlyVFR, with local ifr possible. Chance shra,
isolated tsra, patchy fg.

Sunday night: mainlyVFR, with local MVFR possible. Chance
shra, isolated tsra.

Monday: mainlyVFR, with local MVFR possible. Breezy.

Monday night:VFR. Breezy.

Tuesday:VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Saturday ... High confidence.

Today... Winds shift to from n-ne to easterly during the day.

May see gusts up to 20 kt on the southern outer waters this
afternoon. Seas remain below 5 ft. Visibility restrictions in
patchy fog should improve by around mid morning or so.

Tonight and Saturday... E-se winds in place. A few gusts up to
25 kt on the southern outer waters late tonight into early sat.

Visibility restriction in patchy fog along the southern waters
late tonight, then in showers and patchy fog moving in from s-n
during sat.

Outlook Saturday night through Tuesday ... Moderate confidence.

Saturday night: winds less than 25 kt. Areas of seas
approaching 5 ft. Chance of rain showers, with isolated
thunderstorms. Patchy fog. Areas of visibility 1 nm or less.

Sunday: winds less than 25 kt. Areas of seas approaching 5 ft.

Slight chance of rain showers, with isolated thunderstorms.

Patchy fog. Areas of visibility 1 nm or less.

Sunday night: winds less than 25 kt. Local rough seas. Slight
chance of rain showers, with isolated thunderstorms.

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

Monday night: winds less than 25 kt. Areas of rough seas.

Tuesday: winds less than 25 kt. Areas of seas approaching 5 ft.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Belk evt
near term... Evt
short term... Belk evt
long term... Belk
aviation... Belk evt
marine... Belk evt


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 11 mi29 min ENE 9.7 G 12 62°F 66°F1015.2 hPa60°F
44090 15 mi29 min 63°F1 ft
WAXM3 - Waquoit Bay Reserve, MA 18 mi74 min Calm 64°F 1015 hPa63°F
NTKM3 - 8449130 - Nantucket Island, MA 25 mi47 min ENE 7 G 9.9 60°F 68°F1015.3 hPa
BZBM3 - 8447930 - Woods Hole, MA 26 mi47 min 63°F 65°F1015.3 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 39 mi69 min NE 7.8 G 9.7 60°F 1 ft1015 hPa (+1.7)60°F
BUZM3 - Buzzards Bay, MA 47 mi59 min NE 11 G 12 62°F 1015.6 hPa (+2.1)

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA5 mi63 minE 510.00 miMostly Cloudy61°F59°F93%1014.8 hPa
Chatham, Chatham Municipal Airport, MA12 mi67 minENE 46.00 miFog/Mist58°F57°F97%1015.4 hPa
Otis Air National Guard Base, MA17 mi64 minNE 78.00 miOvercast61°F60°F100%1015.6 hPa

Wind History from HYA (wind in knots)
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Last 24hrSW9SW10SW6SW7SW8SW8S8S9SE7SE7S6S54S4S6CalmCalmCalmCalmCalmNE3N4N6E5
1 day agoCalmS3S5S6S6S11S14S12
G19
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SW10SW10SW12SW11SW11SW13SW11SW9SW9SW9SW6SW6
2 days agoNW9
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N9NE7N7N6CalmCalmCalmCalmCalmN5CalmCalmCalmCalm

Tide / Current Tables for South Yarmouth, Bass River, Nantucket Sound, Massachusetts
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South Yarmouth
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Fri -- 01:55 AM EDT     Moonset
Fri -- 02:54 AM EDT     0.11 feet Low Tide
Fri -- 05:06 AM EDT     Sunrise
Fri -- 09:12 AM EDT     2.88 feet High Tide
Fri -- 02:59 PM EDT     Moonrise
Fri -- 03:17 PM EDT     0.06 feet Low Tide
Fri -- 08:18 PM EDT     Sunset
Fri -- 09:44 PM EDT     3.06 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.60.90.30.10.30.71.32.12.62.92.82.41.81.10.40.10.20.51.11.82.533.12.8

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Fri -- 01:54 AM EDT     Moonset
Fri -- 02:41 AM EDT     1.92 knots Max Flood
Fri -- 05:06 AM EDT     Sunrise
Fri -- 05:35 AM EDT     -0.00 knots Slack
Fri -- 08:28 AM EDT     -1.60 knots Max Ebb
Fri -- 11:30 AM EDT     0.00 knots Slack
Fri -- 02:59 PM EDT     Moonrise
Fri -- 03:09 PM EDT     2.05 knots Max Flood
Fri -- 06:06 PM EDT     -0.00 knots Slack
Fri -- 08:17 PM EDT     Sunset
Fri -- 09:05 PM EDT     -1.70 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.71.41.81.91.50.6-0.4-1.2-1.6-1.6-1.2-0.40.41.21.821.91.20.1-0.9-1.5-1.7-1.5-1

Weather Map and Satellite Images
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wmap_A
GOES Local Image of    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.
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Wind Forecast for Boston, MA (6,6,7,8)
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Ground Weather Radar Station Boston, MA
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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 numerious 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.