Tuesday, September17, 2019 L-36.com


Marine Weather and Tides
Yarmouth Port, MA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:22AMSunset 6:49PM Tuesday September 17, 2019 6:26 AM EDT (10:26 UTC) Moonrise 8:46PMMoonset 9:27AM Illumination 89% Phase: Waning Gibbous; Moon at 18 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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ANZ231 Cape Cod Bay- 334 Am Edt Tue Sep 17 2019
Today..N winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft.
Tonight..NE winds 10 to 15 kt. Seas around 2 ft.
Wed..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Wed night..NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 3 ft.
Thu..NE winds 5 to 10 kt. Seas 2 to 3 ft.
Thu night..NE winds around 5 kt. Seas around 2 ft.
Fri..N winds around 5 kt. Seas around 3 ft.
Fri night..NW winds 5 to 10 kt. Seas around 3 ft.
Sat..N winds 5 to 10 kt. Seas around 3 ft.
Sat night..S winds around 5 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 334 Am Edt Tue Sep 17 2019
Synopsis for massachusetts and rhode island coastal waters.. Large high pres will build slowly S across the waters by mid week, and remaining through Sat. 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 Yarmouth Port, MA
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location: 41.71, -70.29     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 170717
afdbox
area forecast discussion
national weather service boston norton ma
317 am edt Tue sep 17 2019

Synopsis
High pressure will continue to bring an extended period of
mainly dry weather right through this weekend. This high
pressure will initially be accompanied by below normal
temperatures into Thursday morning. A warmup occurs thereafter
with above normal temperatures expected by this weekend.

The next best chance at any rainfall in the form of showers is
forecast for early next week.

Near term through today
High pressure over eastern canada will be the dominant feature
for our weather today. Expecting a N to NE flow to develop,
with colder air being push across southern new england. Plenty
of sunshine today will take a bit of the edge off this colder
air. Slightly below normal high temperatures, lowest near the
immediate east coast, CAPE and islands.

Short term tonight through 6 pm Wednesday
Onshore flow continues tonight into Wednesday. Colder air will
continue to flow into our region, with Wednesday probably being
the coldest day this week. As temperatures lower, expecting
marine stratus to develop and move onshore. The layer of higher
moisture content is rather shallow beneath a substantial
subsidence inversion. Temperature differential for ocean
enhancement is impressive for mid september. There may be a few
sprinkles to contend with tonight into Wednesday morning.

Long term Wednesday night through Monday
Highlights...

- mild days, cool nights through the week, dry throughout
- turning warmer over the weekend into next week
- next chance of rain may not be till early next week
details...

transitioning warmer? Mild days, cool nights through this week.

But by this weekend into the following week, we could see
warmer than average conditions. Positive teleconnections across
the board minus the pna. Wpo epo strongest into late september
signaling a strong pacific jet into western N america. Mid-
latitude energy downsheared across the W CONUS as a prominent
mjo is forecast over the W hemisphere africa (phase 1 8), the
potential combination N atlantic tropical waves latent heat
release with favorable downstream E CONUS ridging from an
onshore mild pacific jet supports warmer than average conditions
advertised by CPC 6-10 8-14 day outlooks. All signs point
towards higher heights late september across new england. With
that there does not seem to be much rainfall opportunity.

Ensembles showing out through the rest of the month there's an
sw-ne E CONUS axis into S new england of less than an inch of
total rainfall. Deterministic forecast guidance highlights our
next best chance of rainfall early the following week. Looks
like we're in store for a long period of dry weather which is
not atypical as september is one of more drier months on
average. Neither is warmer than average temperatures. A glance
back at records for late september, we've observed upper 80s to
low 90s for highs.

An ensemble blend forecast with lower certainty on specifics
further out in the forecast. Warming trend into the weekend as
high pressure shifts E and S SW winds prevail prior to a
sweeping cold front early the following week with a chance of
showers. Could see a brief cool down thereafter before warmer
weather builds back in as we go into autumn.

Aviation 07z Tuesday through Saturday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Wednesday ...

today...VFR. N wind becoming NE at 5 to 15 kt. Gusts up to 20
kt may occur across the CAPE and islands by mid to late
afternoon.

Tonight and Wednesday... MainlyVFR. A period of MVFR ceilings
may develop along with a passing sprinkle or two possible across
portions of SE ma and ri late tonight into Wednesday morning.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Wednesday night through Saturday ...

Wednesday night through Thursday:VFR. Breezy.

Thursday night through Saturday:VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Wednesday ... High confidence.

Today... N NE wind gusts up to 20 knots. May see a few gusts
approaching 25 knots across some of our southeast waters. Seas
2-4 ft.

Tonight and Wednesday... Ne wind gusts around 20 knots at times
in the cool air advection pattern. Gusts increasing up to
around 25 kt Wednesday afternoon. Seas increasing 3-5 ft by
early Wednesday morning across the open waters. Will need to
consider small craft advisories with later forecasts.

Outlook Wednesday night through Saturday ... Moderate confidence.

Wednesday night: low risk for small craft advisory winds with
gusts up to 25 kt. Areas of rough seas.

Thursday through Thursday night: winds less than 25 kt. Local
rough seas.

Friday through Friday night: winds less than 25 kt. Rough seas
up to 10 ft.

Saturday: winds less than 25 kt. Areas of rough seas.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Belk sipprell
near term... Belk
short term... Belk
long term... Sipprell
aviation... Belk sipprell
marine... Belk sipprell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 9 mi56 min 64°F2 ft
44020 - NANTUCKET SOUND 15 mi36 min N 14 G 18 62°F 69°F1 ft55°F
WAXM3 - Waquoit Bay Reserve, MA 15 mi101 min W 1.9 52°F 1017 hPa50°F
BZBM3 - 8447930 - Woods Hole, MA 24 mi56 min 60°F 69°F1017.7 hPa
NTKM3 - 8449130 - Nantucket Island, MA 31 mi56 min N 8.9 G 13 63°F 69°F1017.3 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 35 mi36 min NNW 14 G 16 61°F 3 ft1017.5 hPa (+0.5)51°F
BUZM3 - Buzzards Bay, MA 45 mi86 min N 14 G 16 61°F 1018.2 hPa (-0.3)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 47 mi56 min N 2.9 G 4.1 55°F 1018.3 hPa
FRXM3 47 mi62 min 54°F 48°F
44013 - BOSTON 16 NM East of Boston, MA 48 mi36 min NNW 16 G 18 60°F 65°F3 ft1016.8 hPa (-0.0)51°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, MA2 mi90 minW 310.00 miFair55°F51°F87%1016.9 hPa
Otis Air National Guard Base, MA13 mi96 minNNW 410.00 miFair50°F46°F88%1017.6 hPa
Chatham, Chatham Municipal Airport, MA16 mi94 minN 010.00 miFair56°F52°F87%1017.3 hPa
Provincetown Municipal Airport, MA21 mi90 minN 810.00 miFair60°F55°F84%1017.3 hPa

Link to 5 minute data for KHYA

Wind History from HYA (wind in knots)
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Last 24hrNW3N4------N14
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N9N9N6--Calm----CalmCalm----------W3
1 day ago----W5----NW5NE5--SW10--SW12SW11SW10
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SW8W8------------W3----
2 days ago--E3----SE10
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Tide / Current Tables for Barnstable Harbor, Beach Point, Massachusetts
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Barnstable Harbor
Click for Map
Tue -- 02:00 AM EDT     9.84 feet High Tide
Tue -- 06:23 AM EDT     Sunrise
Tue -- 08:25 AM EDT     0.59 feet Low Tide
Tue -- 09:26 AM EDT     Moonset
Tue -- 02:16 PM EDT     9.86 feet High Tide
Tue -- 06:47 PM EDT     Sunset
Tue -- 08:46 PM EDT     Moonrise
Tue -- 08:47 PM EDT     0.52 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.39.19.89.37.85.93.81.90.70.92.44.66.88.79.89.68.36.54.42.40.90.61.73.7

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
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Cape Cod Canal
Click for Map
Tue -- 12:04 AM EDT     -0.01 knots Slack
Tue -- 03:01 AM EDT     -4.48 knots Max Ebb
Tue -- 06:05 AM EDT     0.20 knots Slack
Tue -- 06:24 AM EDT     Sunrise
Tue -- 09:03 AM EDT     4.20 knots Max Flood
Tue -- 09:28 AM EDT     Moonset
Tue -- 12:27 PM EDT     -0.03 knots Slack
Tue -- 03:22 PM EDT     -4.34 knots Max Ebb
Tue -- 06:19 PM EDT     0.19 knots Slack
Tue -- 06:48 PM EDT     Sunset
Tue -- 08:47 PM EDT     Moonrise
Tue -- 09:17 PM EDT     4.16 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.8-2.9-4.1-4.5-4.2-3.2-0.92.93.94.243.31.9-2.2-3.6-4.3-4.2-3.4-1.72.53.74.143.4

Weather Map
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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.
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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.