Wednesday, December12, 2018 L-36.com


Marine Weather and Tides
West Yarmouth, MA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:57AMSunset 4:12PM Wednesday December 12, 2018 2:49 AM EST (07:49 UTC) Moonrise 11:50AMMoonset 10:08PM Illumination 22% Phase: Waxing Crescent; Moon at 5 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- 116 Am Est Wed Dec 12 2018
.small craft advisory in effect from 7 am est this morning through this afternoon...
Rest of tonight..NW winds 10 to 15 kt. Seas around 2 ft. A chance of snow showers.
Wed..NW winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to 3 ft. A chance of snow showers.
Wed night..N winds 10 to 15 kt with gusts up to 25 kt, becoming ne 5 to 10 kt after midnight. Seas 2 to 4 ft. A chance of snow showers.
Thu..NE winds 5 to 10 kt. Gusts up to 20 kt in the morning. Seas 2 to 4 ft.
Thu night..E winds 5 to 10 kt. Seas around 2 ft.
Fri..SE winds 5 to 10 kt with gusts up to 20 kt. Seas around 2 ft.
Fri night..SE winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to 3 ft. Rain.
Sat..SE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Rain likely.
Sat night..NE winds around 10 kt with gusts up to 30 kt. Seas 4 to 7 ft. A chance of rain.
Sun..NE winds 5 to 10 kt with gusts up to 30 kt. Seas 5 to 8 ft. A chance of rain.
Sun night..N winds 5 to 10 kt with gusts up to 20 kt. Seas 4 to 7 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 116 Am Est Wed Dec 12 2018
Synopsis for massachusetts and rhode island coastal waters.. Weak low pres will pass E across the waters tonight, afterwhich high pres builds S from quebec Wed and Thu. Expect ocean effect snow bands to develop under n/nw winds across the eastern massachusetts waters Wed into Wed night. The high will shift E of the waters on Fri. A storm system will approach the waters from the sw Fri night and Sat, lifting slowly across the waters Sat night and Sun. 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
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location: 41.6, -70.27     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 120705
afdbox
area forecast discussion
national weather service boston norton ma
205 am est Wed dec 12 2018

Synopsis
Mainly dry and cold weather prevails into Thursday, except for some
scattered ocean effect snow showers Wednesday, mainly across
the outer-cape. Mild temperatures arrive Friday and continue
into early next week with the best chance for rain Friday night
into Saturday in association with low pressure.

Near term through today
Latest streamline analysis placed the best surface convergence
zone across the upper CAPE and the vineyard early this morning.

Expecting this convergence area to move farther east during the
day, especially once a vigorous mid level shortwave moves
offshore early this morning. Not seeing great reduction in
visibility so far this morning. Thus only light accumulation is
expected.

The details will be crucial this morning, as even a 10 degree
shift in the dominant wind direction will alter the location of
the greatest snowfall. There is some mid level frontogenesis as
well, but thinking the ocean-effect snow process will be the
dominant factor today due to drier mid level air arriving this
afternoon. The greatest instability still appears to remain
over the coastal waters. The area of at risk for some snow will
be from coastal plymouth county, east across the CAPE and
islands.

Across the rest of southern new england, clearing should be
rather quick this morning, expect perhaps towards the
berkshires. Despite plenty of sunshine, temperatures will still
be well below normal.

Short term tonight through 6 pm Thursday
Strong high pressure moves from quebec across northern new
england tonight, then reaching a point south of nova scotia late
Thursday. Dry weather for most of southern new england tonight
and Thursday. With the high pressure not directly overhead,
looking at abundant mid level clouds arriving late tonight into
Thursday as another shortwave approaches from the west.

These clouds may not arrive in time to place an curbs on
radiational cooling tonight. Low temperatures in the teens and
single digits above zero will be common. Even near the coast,
low temperatures of 20-25 degrees are expected. The colder start
and limited sunshine Thursday will mean another day of well
below normal high temperatures, likely even lower than today.

Long term Thursday night through Tuesday
Highlights...

* milder Friday with a period rain focused Fri night into sat
* low confidence forecast early next week
details...

Thursday night...

dry weather should prevail... But we may see some mid level
cloudiness overspread parts of the region overnight. This a result
of high pressure moving off the coast and warm advection aloft.

Still expect to see low temps bottom out mainly in the upper teens
to lower 20s with rather light winds.

Friday into early next week...

a pattern change to milder weather expected as an active pacific jet
flushes out the cold weather we have experienced over much of the
last month. Given the pattern transition and active sub-tropical
jet... The forecast going forward remains low confidence into early
next week.

We do think that warm advection ahead of southern stream energy will
result in a period of rain... Focused Friday night into Saturday.

A low risk for a brief period of freezing rain at the onset can
not be ruled out... But generally expecting a rain event.

The other big issue is the track timing of the surface low. This
will all come down to the location strength of both the northern and
southern stream energy. If the southern stream energy gets pulled
northward, precipitation chances would continue into Sunday and or
Monday... But if it gets shunted south our region will mainly be dry.

If we do see precipitation Sun into mon... Ptype would favor rain
given the overall milder regime. However... A low risk for some
wintry precipitation can not be completely ruled out. The storm
would have to track near the benchmark and would also require enough
marginally cold air to work down from the north.

Aviation 07z Wednesday through Sunday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday ... High confidence.

MainlyVFR across southern new england through Thursday. Areas
of MVFR, and possibly local ifr, in snow showers and lower
clouds across the CAPE and islands into this evening.

Winds turning NW N through today and becoming gusty. Light N ne
developing tonight, shift E Thursday.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Thursday night through Sunday ...

Thursday night:VFR.

Friday: mainlyVFR, with areas MVFR possible. Breezy. Chance
ra.

Friday night: mainly MVFR, with local ifr possible. Breezy. Ra.

Saturday: mainly MVFR, with local ifr possible. Ra likely.

Saturday night: mainly MVFR, with local ifr possible. Windy
with areas gusts to 30 kt. Chance ra.

Sunday: mainly MVFR, with local ifr possible. Windy with local
gusts to 30 kt. Chance ra.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday ... High confidence.

Northerly flow increases across the waters this morning. Rough
seas expected to develop across the outer coastal waters as a
result. A small craft advisory has been issued for many of our
open waters. In addition to the winds, ocean-effect snow showers
may reduce visibility at times to less than 3 nm late into this
evening across the eastern coastal waters. Winds diminish
tonight, but seas will take longer to subside, especially across
the eastern outer coastal waters.

Outlook Thursday night through Sunday ...

Thursday night: winds less than 25 kt.

Friday: winds less than 25 kt. Chance of rain.

Friday night: moderate risk for small craft advisory winds with
gusts up to 30 kt. Seas locally approaching 5 ft. Rain.

Saturday: low risk for small craft advisory winds with gusts up
to 25 kt. Areas of seas approaching 5 ft. Rain likely.

Saturday night: moderate risk for small craft advisory winds
with local gusts up to 30 kt. Rough seas up to 11 ft. Chance of
rain.

Sunday: moderate risk for small craft advisory winds with local
gusts up to 30 kt. Rough seas up to 12 ft. Chance of rain.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory from 7 am this morning to 4 pm est this
afternoon for anz231>234-251.

Small craft advisory from 7 am this morning to 1 pm est
Thursday for anz250-254-255.

Small craft advisory until 7 am est Thursday for anz256.

Synopsis... Belk frank
near term... Belk
short term... Belk
long term... Frank
aviation... Belk frank
marine... Belk frank


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 7 mi30 min NNW 12 G 14 33°F 40°F1011.3 hPa30°F
WAXM3 - Waquoit Bay Reserve, MA 14 mi65 min 2.9 31°F 1012 hPa30°F
44090 17 mi20 min 44°F1 ft
BZBM3 - 8447930 - Woods Hole, MA 22 mi32 min 31°F 40°F1010.8 hPa
NTKM3 - 8449130 - Nantucket Island, MA 24 mi32 min N 2.9 G 7 33°F 38°F1011.1 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 42 mi60 min NW 12 G 16 35°F 3 ft1010.9 hPa (-1.9)19°F
BUZM3 - Buzzards Bay, MA 43 mi50 min NNE 11 G 12 34°F 1011.4 hPa (-1.6)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 48 mi32 min NNW 9.9 G 14 33°F 1012 hPa
FRVM3 - 8447386 - Fall River, MA 48 mi38 min 32°F 44°F1012.1 hPa
FRXM3 49 mi32 min 33°F 20°F

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA6 mi54 minNNW 72.00 miLight Snow Fog/Mist33°F28°F85%1011 hPa
Otis Air National Guard Base, MA14 mi55 minNNE 45.00 miLight Snow30°F26°F86%1011.5 hPa
Chatham, Chatham Municipal Airport, MA16 mi58 minN 04.00 miLight Snow Fog/Mist32°F28°F88%1011.7 hPa
Marthas Vineyard Airport, MA23 mi57 minNNE 52.50 miLight Snow Fog/Mist31°F28°F92%1011.1 hPa

Wind History from HYA (wind in knots)
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Last 24hrCalmNW4CalmCalmCalmCalmN4N3S5S5SW66SW5S4CalmCalmCalmCalmCalmCalmCalmCalmCalmNW7
1 day agoNW4W4NW5NW5N7N10
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NE12N9N8NE8N8N5N4Calm3N6N3N4CalmW3NW3
2 days agoW3W4W5W4CalmCalmW5W7W7W7W10W10SW10SW8SW7SW8SW7SW8W5CalmSW5W4W6NW5

Tide / Current Tables for Hyannis Port, Nantucket Sound, Massachusetts (2)
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Hyannis Port
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Wed -- 03:23 AM EST     2.84 feet High Tide
Wed -- 06:58 AM EST     Sunrise
Wed -- 08:46 AM EST     0.48 feet Low Tide
Wed -- 10:49 AM EST     Moonrise
Wed -- 03:29 PM EST     3.08 feet High Tide
Wed -- 04:11 PM EST     Sunset
Wed -- 09:08 PM EST     Moonset
Wed -- 09:20 PM EST     0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.422.52.82.82.41.81.20.60.50.71.21.72.22.7332.621.30.60.20.30.6

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
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Wed -- 12:42 AM EST     -0.00 knots Slack
Wed -- 03:20 AM EST     -1.60 knots Max Ebb
Wed -- 06:30 AM EST     0.00 knots Slack
Wed -- 06:57 AM EST     Sunrise
Wed -- 09:48 AM EST     1.67 knots Max Flood
Wed -- 10:48 AM EST     Moonrise
Wed -- 12:50 PM EST     -0.00 knots Slack
Wed -- 03:29 PM EST     -1.65 knots Max Ebb
Wed -- 04:10 PM EST     Sunset
Wed -- 06:38 PM EST     0.00 knots Slack
Wed -- 09:07 PM EST     Moonset
Wed -- 10:11 PM EST     1.99 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.8-0.3-1.2-1.6-1.5-1.1-0.40.41.21.61.71.40.8-0.2-1.1-1.6-1.6-1.2-0.60.31.21.821.9

Weather Map and Satellite Images
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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 (2,6,7,8)
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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.