Saturday, June23, 2018

Marine Weather and Tides
Sandwich, 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 8:21PM Saturday June 23, 2018 2:02 PM EDT (18:02 UTC) Moonrise 4:04PMMoonset 2:26AM Illumination 78% 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
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7 Day Forecast for Marine Location Near Sandwich CDP, MA
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location: 41.78, -70.49     debug

Area Discussion for - Boston, MA
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Fxus61 kbox 231752
area forecast discussion
national weather service boston norton ma
152 pm edt Sat jun 23 2018

A warm front will slowly shift north, bringing showers and a
few thunderstorms this afternoon and tonight. Low pressure from
the great lakes moves across new england Sunday and will bring
showers and a few thunderstorms, especially during the afternoon
and evening. The activity may linger into Monday. Mainly dry
weather with seasonable temperatures anticipated Tuesday and
Wednesday with a ridge of high pressure in control. Summer heat
and humidity should return by the end of next week as this high
moves east of the region.

Near term until 6 pm this evening
Radar during early afternoon shows three thunderstorms, one near
nantucket and other two passing well to the south. Much of the
remaining showers have moved northeast into nh vt, but patches
of light showers linger. A more substantial collection of
showers over western pa is moving northeast and trends to the
berkshires after 00z.

Low level easterly flow has brought a stable marine layer to
much of southern new england. The airmass above the marine layer
shows some potential for developing showers and maybe an
isolated tstm.

Expect clouds to linger through the afternoon with ocean water
temperatures suggesting MAX temps over land in the upper 50s to
mid 60s.

Short term 6 pm this evening through 6 pm Sunday

will see showers through most of the night as another weak low
moves across along the warm front that tries to push toward the
s coast. Another weak wave may move along the front through
around midnight, which could be a trigger for a few more
thunderstorms along with locally heavy rainfall.

Drier air moves E after midnight as the pwat moisture plume
moves offshore. With the high moisture in place, fog will
redevelop, locally dense at times along portions of the S coast,
cape cod and the islands. Winds will shift to w-sw as the low
moves to the gulf of maine. Temps will bottom out from the mid
50s to around 60.


another weak h5 low will move E out of ny state, which could be
another trigger for convection to develop from mid morning
through the afternoon. Looks like the best shot for
showers isold thunder will occur across the interior where
likely pops are in place, with chc pops for most of the coastal
plain. With dewpoints in the lower-mid 60s, expect a mild and
muggy day. Highs will be close to seasonal normals.

Long term Sunday night through Friday

* mainly dry seasonable temps with comfortable humidity Tue and wed
* summer heat humidity should return by the end of next week


a vigorous shortwave cold pool aloft will move across the
northeast. Much of the 23 00z guidance suite has come into
better agreement dropping 500 mb temperatures around -20c during
the afternoon and evening. While this should result in decent
lift, the atmospheric column is drying out fairly quickly. Its
looking like a race between the cold pool and moisture. Where
these coincide, scattered showers are expected to develop. At
this time, this appears to be mainly across the eastern half of
ma and points farther ne. This is a delicate balance between
features, and one which could easily change with later
forecasts over the next day or so.


mainly dry and pleasant early summer weather with a ridge of high
pressure in control.


mainly dry weather to start, with an increasing risk for showers
as a front approaches late in the day.

Thursday and Friday...

a pattern change to more summer-like warmth and humidity
expected as upper level ridging approaches our region. Dry weather
probably dominates much of this time, but a few showers or
thunderstorms cannot be ruled out at times, particularly Friday
with the expected passage of another cold front.

Aviation 18z Saturday through Thursday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday ... High confidence through midday,
then moderate confidence.

Remainder of this afternoon through tonight...

most of the showers have moved past southern new england, but a
few showers may redevelop during the mid-late afternoon. A warm
front is moving north across the region, and this is bringing
lower cigs. Ifr CIGS along the south coast will move north,
covering much of the region this afternoon and evening,

mild humid air lingers through the nighit. This will keep cigs
at ifr or lower through the night while vsbys lower to 2-4 miles
in fog. Vsbys will go even lower in fog along the south coast
with potential for 1 4 mile vsbys on nantucket.


ifr CIGS vsbys early, but improving toVFR during the morning.

Low conditions may continue through the morning on the islands,
but should improve toVFR around midday. Low pressure moves
across new england during the day, swinging a cold front through
the region during the afternoon evening. This will bring showers
and a few thunderstorms. Overall conditions should beVFR from
midday through evening, but with brief lowering to MVFR during
showers tstrms.

Sunday night...

showers scattered tstms end early. Any low conditions will
improve toVFR overnight. Winds trend nnw overnight bringing
drier air.

Kbos terminal... High confidence in TAF trends. Moderate
confidence in timing.

Kbdl terminal... High confidence in TAF trends. Moderate
confidence in timing.

Outlook Sunday night through Wednesday ... Moderate confidence.

Monday:VFR. Breezy. Slight chance shra.

Monday night:VFR. Breezy.

Tuesday through Tuesday night:VFR.

Wednesday: mainlyVFR, with local MVFR possible. Breezy. Slight
chance shra.

Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday ... High confidence.

This afternoon... East to southeast winds through the afternoon.

May see a few gusts approaching 25 kt across the southern
waters. Visibility will lower in showers and areas of fog,
below 1 nm across the waters E and S of CAPE cod by evening.

Showers moving in from SW to NE with isolated thunderstorms
during the afternoon.

Tonight... E-se winds gusting up to around 20 kt, shift to w-sw
after midnight. Seas up to 5 ft on the southern outer waters,
where small craft advisories have been issued. Areas of fog with
visibility 2 nm or less, at or below 1 nm on the southern
waters. Showers likely with isolated thunder, which should shift
e after midnight.

Sunday... W-nw winds 10-15 kt shift to s-sw during the day. Seas
remain around 5 ft on the southern outer waters. Visibility 1 to 3
nm early, improving by midday.

Outlook Sunday night through Wednesday ... Moderate confidence.

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

Slight chance of rain showers, isolated thunderstorms, patchy
fog. Local visibility 1 nm or less.

Sunday night: winds less than 25 kt. Areas of seas approaching
5 ft. Chance of rain showers, isolated thunderstorms, patchy
fog. Local visibility 1 to 3 nm.

Monday: low risk for small craft advisory winds with gusts up
to 25 kt. Areas of seas approaching 5 ft. Slight chance of rain

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

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

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

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory from 2 am to 6 pm edt Sunday for

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

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 9 mi33 min 63°F2 ft
WAXM3 - Waquoit Bay Reserve, MA 14 mi78 min 2.9 64°F 1013 hPa64°F
44020 - NANTUCKET SOUND 23 mi33 min E 16 G 18 60°F 65°F1011.4 hPa59°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 35 mi73 min ENE 12 G 14 59°F 2 ft1013.7 hPa (-1.9)58°F
BUZM3 - Buzzards Bay, MA 39 mi63 min NE 13 G 14 61°F 1012 hPa (-2.6)
44013 - BOSTON 16 NM East of Boston, MA 40 mi73 min ENE 9.7 G 12 60°F 62°F2 ft1013.8 hPa (-1.1)57°F
NAXR1 - Narragansett Bay Reserve, RI 46 mi78 min ENE 8 65°F 1012 hPa62°F

Wind History for Borden Flats Light at Fall River, MA
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Otis Air National Guard Base, MA9 mi68 minNNE 88.00 miOvercast63°F62°F100%1012.9 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA13 mi67 minENE 510.00 miOvercast65°F63°F93%1012.1 hPa
Plymouth, Plymouth Municipal Airport, MA16 mi71 minENE 1110.00 miOvercast62°F57°F84%1013 hPa
Provincetown Municipal Airport, MA22 mi67 minENE 810.00 miOvercast62°F57°F86%1013.7 hPa
Marshfield Airport, MA24 mi68 minENE 610.00 miOvercast63°F55°F77%1013.5 hPa

Wind History from FMH (wind in knots)
Last 24hrSE14SE15SE9SE6SE6SE5SE5SE4SE4SE5E6E7E5E7E8E11E11
1 day agoS97SE76SE4SE6S4SW3SW3CalmCalmCalmCalmNE6N5NE5NE6--NE7NE7SE9E9SE12
2 days agoSW16SW17SW14

Tide / Current Tables for Cape Cod Canal (East Entrance), Massachusetts
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Cape Cod Canal (East Entrance)
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Sat -- 02:09 AM EDT     0.49 feet Low Tide
Sat -- 02:26 AM EDT     Moonset
Sat -- 05:07 AM EDT     Sunrise
Sat -- 08:25 AM EDT     8.31 feet High Tide
Sat -- 02:31 PM EDT     0.66 feet Low Tide
Sat -- 04:03 PM EDT     Moonrise
Sat -- 08:20 PM EDT     Sunset
Sat -- 08:51 PM EDT     9.29 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
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Cape Cod Canal
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Sat -- 12:18 AM EDT     0.19 knots Slack
Sat -- 02:27 AM EDT     Moonset
Sat -- 03:32 AM EDT     3.98 knots Max Flood
Sat -- 05:08 AM EDT     Sunrise
Sat -- 06:39 AM EDT     -0.15 knots Slack
Sat -- 09:26 AM EDT     -4.25 knots Max Ebb
Sat -- 12:40 PM EDT     0.03 knots Slack
Sat -- 03:59 PM EDT     4.11 knots Max Flood
Sat -- 04:04 PM EDT     Moonrise
Sat -- 07:08 PM EDT     -0.14 knots Slack
Sat -- 08:20 PM EDT     Sunset
Sat -- 09:56 PM EDT     -4.32 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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GOES 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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (14,3,4,5)
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Ground Weather Radar Station Boston, MA
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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 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 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.