Friday, August23, 2019 L-36.com


Marine Weather and Tides
Duxbury, MA

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Sunrise 5:57AMSunset 7:33PM Friday August 23, 2019 9:34 AM EDT (13:34 UTC) Moonrise 11:49PMMoonset 1:40PM Illumination 45% Phase: Third Quarter Moon; Moon at 23 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- 717 Am Edt Fri Aug 23 2019
Today..NW winds 5 to 10 kt. Seas 1 foot or less. Showers likely this morning.
Tonight..W winds around 5 kt, becoming N after midnight. Seas 2 to 3 ft.
Sat..N winds around 10 kt. Seas 2 to 3 ft.
Sat night..NE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft.
Sun and Sun night..NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft.
Mon..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Tue..E winds 5 to 10 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 717 Am Edt Fri Aug 23 2019
Synopsis for massachusetts and rhode island coastal waters.. A cold front south of new england moves farther offshore today. Showers along the front will also move farther offshore. Canadian high pressure moves to the maritimes by late Saturday and lingers there into the first part of next week. This brings fair weather and less humidity for much of the forecast period. Winds become northeast Saturday afternoon and increase in speed Sunday and Monday. 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 Duxbury, MA
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location: 42.04, -70.67     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 231112
afdbox
area forecast discussion
national weather service boston norton ma
712 am edt Fri aug 23 2019

Synopsis
A cold front along the south coast this morning moves well
offshore during the day. Showers along the front will move
offshore with the front. Drier less humid air moves in from the
northwest. High pressure will linger across central and eastern
canada through this weekend into early next week. Cool
temperatures both Sunday and Monday with the onshore wind flow
in place, along with spotty light rain or showers especially
near the coast. As the high slowly pushes east, temperatures
will moderate by mid week, but there could be a threat for
showers as a cold front approaches.

Near term until 6 pm this evening
650 am update...

noting the cold front S of long island to near nantucket at 09z.

However, N of the front, a band of showers lying from SE ny
through most of ct into N ri and central to NE mass on latest ne
regional 88d radar imagery. Only spotty light showers being
reported on latest observations, with the steadiest light rain
from around khpn-kdxr-kijd and kowd southeastward at 10z. While
the rain elements continue to shift ne, while the entire area
is slowly shifting s-se behind the front. Mainly dry conditions
noted across central and western mass, but may see a few spotty
showers over the next hour or two.

Back edge of the cloud deck, noted across SW me to central nh
and southern vt at 1030z as seen on latest goes-east nighttime
microphysics rgb satellite imagery. Big question will be how
long will the clouds linger before slowly pushing southward.

This may take a while as the h5 long wave trough will be slow to
swing across, so may see the w-sw mid level steering flow
linger longer than currently forecast.

Previous discussion...

once the flow shifts, expect clearing skies, earliest in
northern ma and latest along the south coast. Cross sections
show drying aloft and at the surface, but a lingering moist
layer around 850 mb. The mixed layer is expected to reach a
little past 850 mb, so there should be some diurnal CU formation
over the interior. The dry air should limit the extent.

Temperatures at 850 mb will be 10-12c, so we expect MAX sfc
temps of 76f to 82f. Best of all, dew points will be in the
upper 40s and 50s everywhere this afternoon evening.

Short term 6 pm this evening through 6 pm Saturday
A fair weather period, quite welcome to most after the recent
spell of humidity. High pressure over northern ontario builds
east, reaching the maritimes late Saturday. This brings a light
north flow to new england tonight, turning to a northeast flow
by Saturday afternoon.

With dew points upper 40s and 50s, expect min temps tonight in
the 50s most places... With upper 40s in the cold spots and
around 60 in large urban areas. The developing northeast flow
will play havoc with mixing, but daytime heating and 8c at 850
mb suggest sfc temperatures into the 70s. If anyone stands a
chance at 80, it will be the ct valley of hartford-springfield.

Long term Saturday night through Thursday
Highlights...

* expect much cooler than normal temperatures Sunday and Monday
especially along the east coast
* onshore winds will bring spotty light rain or showers at
times into mid week
* temperatures return to near normal levels around mid week
* another chance for showers Wednesday into Thursday
details...

Saturday night through Monday...

with a large high pressure area extending across quebec and
northern new england, a return northeasterly wind flow will
bring cool temperatures across the region especially along east
coastal areas into early next week.

With the onshore wind flow, the long ocean fetch will bring
increasing low level moisture westward. So, can not rule out
periods of spotty light rain and or showers at times mainly over
the weekend. By Monday, it appears the southern extend of the
large ridge will start to shift into N mass, which will bring
drier conditions across the entire region with good subsidence.

So, any spotty precip early should end, though clouds may linger
across eastern and S coastal areas through the day.

Expect daytime highs mainly in the lower to mid 70s, but may
not break 70 along the immediate E coast as well as outer cape
cod and nantucket.

With the long fetch across the western atlc, will see E to ne
winds gusting up to 25-30 mph along the E coast both Sunday and
Monday.

Monday night through Thursday...

the large high center across the maritimes will begin to shift
e during this timeframe as a cold front slowly shifts out of the
great lakes. Winds will diminish somewhat as the pressure
gradient relaxes, then will veer to se-s by later Wed into thu.

Increasing uncertainty as to how quickly the ridge will shift
further offshore along with the timing of the approaching cold
front. At this point, the ridge will keep dry conditions in
place on Tuesday, except for spotty light showers mainly near
the S coast. Deepening layer moisture as well as slowly but
steadily increasing dewpoints will approach starting later
Tuesday and continue through Thursday. Expect highs on Wed to be
close to seasonal levels, then upward to around 5 degrees above
normal on thu.

The approaching cold front will bring a more organized shot for
showers starting late Tuesday night across the E slopes of the
berkshires, then slowly shifting E Wed and thu. Timing of the
actual front still in question due to the exit of the maritime
high pressure.

Aviation 12z 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 ... Moderate confidence.

Through 14z...

mainlyVFR. Mainly dry N central and W mass. A band of showers
from N ct through NE mass will shift ne, but the entire zone
will shift s-se. May see brief, local MVFR conditions in any
heavier showers or lower CIGS mainly across NE ct ri S coastal
mass.

Rest of today...

vfr most of the region. Brief MVFR CIGS vsbys in showers along
the south coast through around 16z-18z. Otherwise becoming
mostly sunny with dry conditions. A few puffy clouds form
inland during the day, but with bases 4000-5000 feet. Northwest
winds turning north by sunset.

Tonight...

vfr with mostly clear skies and light north winds.

Saturday...

vfr. North wind turns from the northeast during the afternoon.

Kbos terminal... High confidence in taf
kbdl terminal... High confidence in taf.

Outlook Saturday night through Tuesday ... Moderate to high
confidence.

Saturday night:VFR. Breezy.

Sunday through Monday: mainlyVFR, with local MVFR possible.

Breezy.

Monday night: mainlyVFR, with local ifr possible. Breezy.

Patchy br.

Tuesday:VFR. Breezy. Slight chance shra.

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... Scattered showers this morning with brief poor vsbys.

Conditions should improve from north to south through around
midday, with drying in the afternoon. Winds will be less than
25 kts through the day. Seas 4 feet or less.

Tonight... Winds less than 20 kt and seas 4 feet or less.

Saturday... Winds less than 20 kt. Seas 4 feet or less.

Outlook Saturday night through Tuesday ... Moderate confidence.

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

Sunday: moderate risk for small craft advisory winds with gusts
up to 25 kt. Seas up to 5 ft. Slight chance of rain.

Sunday night: low risk for small craft advisory winds with
gusts up to 25 kt. Seas up to 5 ft. Slight chance of rain.

Monday: low risk for small craft advisory winds with gusts up
to 30 kt. Seas up to 5 ft. Slight chance of rain.

Monday night: winds less than 25 kt. Seas up to 5 ft. Slight
chance of rain.

Tuesday: winds less than 25 kt. Seas up to 5 ft. Slight chance
of rain showers.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44013 - BOSTON 16 NM East of Boston, MA 21 mi44 min 68°F 68°F1 ft1013.3 hPa (+1.7)
44090 23 mi34 min 68°F1 ft
44018 - SE Cape Cod 30NM East of Nantucket, MA 30 mi44 min WNW 9.7 G 12 67°F 2 ft1014.2 hPa (+1.8)58°F
BHBM3 - 8443970 - Boston, MA 30 mi64 min 71°F 1014.5 hPa
WAXM3 - Waquoit Bay Reserve, MA 33 mi109 min WNW 1.9 73°F 1014 hPa67°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 34 mi90 min WSW 3.9 G 3.9 67°F 65°F1 ft1013.4 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 35 mi64 min NW 7 G 8.9 69°F 1015.4 hPa
FRVM3 - 8447386 - Fall River, MA 35 mi64 min 69°F 80°F1015.8 hPa
BZBM3 - 8447930 - Woods Hole, MA 36 mi64 min 73°F 74°F1014.2 hPa
FRXM3 36 mi70 min 69°F 57°F
FOXR1 - 8454000 - Providence, RI 42 mi64 min N 2.9 G 7 67°F 75°F1015.3 hPa
PVDR1 42 mi64 min WNW 2.9 G 5.1 66°F 1015.7 hPa60°F
CPTR1 - 8452944 - Conimicut Light, RI 42 mi64 min WNW 8 G 8.9 67°F 78°F1015.5 hPa
44020 - NANTUCKET SOUND 43 mi44 min N 9.7 G 14 73°F 75°F1 ft60°F
NAXR1 - Narragansett Bay Reserve, RI 45 mi109 min NNE 5.1 69°F 1014 hPa58°F
PRUR1 45 mi64 min 65°F 60°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 45 mi64 min N 2.9 G 5.1 66°F 1016 hPa
BUZM3 - Buzzards Bay, MA 48 mi34 min NNW 16 G 16 66°F 1015.5 hPa (+1.9)

Wind History for Borden Flats Light at Fall River, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Marshfield Airport, MA4 mi39 minN 010.00 miMostly Cloudy68°F64°F88%1014.6 hPa
Plymouth, Plymouth Municipal Airport, MA10 mi42 minW 47.00 miLight Rain66°F62°F87%1015.1 hPa
Taunton, Taunton Municipal Airport, MA21 mi42 minN 04.00 miLight Rain66°F61°F84%1015 hPa

Link to 5 minute data for KGHG

Wind History from GHG (wind in knots)
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5CalmCalmCalmCalmCalmCalmNW4CalmW3Calm4CalmNW4CalmSW4
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2 days agoCalm5NE7NE7NE66SE7SE5CalmSE5CalmCalmCalmCalmW4W4W4SW4SW4CalmCalmSW55SW8

Tide / Current Tables for Gurnet Point, Massachusetts
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Gurnet Point
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Fri -- 05:17 AM EDT     8.39 feet High Tide
Fri -- 05:58 AM EDT     Sunrise
Fri -- 10:58 AM EDT     Last Quarter
Fri -- 11:29 AM EDT     1.36 feet Low Tide
Fri -- 01:39 PM EDT     Moonset
Fri -- 05:37 PM EDT     9.09 feet High Tide
Fri -- 07:31 PM EDT     Sunset
Fri -- 11:48 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.52.94.66.27.68.38.17.15.53.82.41.51.52.84.66.37.88.998.16.64.83.11.8

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
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Cape Cod Canal
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Fri -- 03:26 AM EDT     -0.11 knots Slack
Fri -- 05:58 AM EDT     Sunrise
Fri -- 06:31 AM EDT     -3.87 knots Max Ebb
Fri -- 09:25 AM EDT     0.17 knots Slack
Fri -- 10:58 AM EDT     Last Quarter
Fri -- 12:23 PM EDT     3.66 knots Max Flood
Fri -- 01:39 PM EDT     Moonset
Fri -- 03:51 PM EDT     -0.12 knots Slack
Fri -- 06:58 PM EDT     -3.86 knots Max Ebb
Fri -- 07:30 PM EDT     Sunset
Fri -- 09:53 PM EDT     0.02 knots Slack
Fri -- 11:49 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.73.52.81.6-1.9-3.1-3.8-3.8-3.2-1.723.13.63.63.12.2-0.9-2.7-3.6-3.9-3.5-2.50.92.7

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 (9,2,3,4)
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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.