Wednesday, September19, 2018 L-36.com


Marine Weather and Tides
Sandwich, MA

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What's New / NOTES
9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 6:25AMSunset 6:44PM Wednesday September 19, 2018 4:11 PM EDT (20:11 UTC) Moonrise 4:04PMMoonset 12:59AM Illumination 74% 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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ANZ231 Cape Cod Bay- 116 Pm Edt Wed Sep 19 2018
This afternoon..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Tonight..NE winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft.
Thu..NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt in the afternoon. Seas 2 to 4 ft.
Thu night..E winds 5 to 10 kt. Seas 2 to 3 ft.
Fri..S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft.
Fri night..SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft.
Sat..NW winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to 4 ft. A chance of showers. Vsby 1 to 3 nm.
Sat night..NE winds 5 to 10 kt. Seas around 2 ft.
Sun..E winds around 5 kt. Seas 1 foot or less.
Sun night..E winds 5 to 10 kt. Seas around 2 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 116 Pm Edt Wed Sep 19 2018
Synopsis for massachusetts and rhode island coastal waters.. High pressure over the maritimes will bring persistent ne winds through Thu. A warm front will push N of the waters Thu night, with s-sw winds possibly approaching gale force Fri and Fri night. A cold front will push across the waters early Sat. High pres builds to the north on 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 Sandwich, MA
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location: 41.78, -70.49     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 191952
afdbox
area forecast discussion
national weather service boston norton ma
352 pm edt Wed sep 19 2018

Synopsis
A mix of clouds to the east and Sun to the west today. High
pressure builds into new england tonight and Thursday yielding
dry cool weather. Warmer Friday ahead of an approaching cold
front then turning cooler over the weekend as high pressure
builds into the area from the great lakes.

Near term until 6 am Thursday morning
Satellite imagery this afternoon shows the directional shear in
the atmosphere through the moist lower levels and drier upper
levels, evident by the low clouds streaming in from the
northeast and the scattered high clouds moving west. Partly sunny
skies will continue for western ma and ct while along the coast
the clouds will likely hang around through the night. This means
warmer highs in the ct valley (mid 70s) than along the coast
(60s). The moist northeast flow in response to the surface high
pressure over the canadian maritimes will continue through the
overnight and early morning hours as the high pressure begins to
build south. This means likely continuation of stratus Thursday
morning and along with some patchy fog. As far as winds go,
today the pressure gradient tightens over the atlantic
associated with the low to our southeast. This means gusty winds
over the waters, cape, and islands up to 30 mph. The gradient
relaxes early Thursday morning and winds will be on the
decrease. Light winds and partial clearing over the western
zones overnight will allow for some good radiational cooling in
western ma ct along with potential for patchy fog inland
overnight. Lows dip into the low to mid 50s.

Short term 6 am Thursday morning through Thursday night
Heights will again be on the rise through the day Thursday as
the upper ridge builds over the east coast and our surface high
center builds further south. The light winds and subsidence
associated with the high pressure will keep a lid on our low
level moisture and at least partly cloudy skies with some sun
mixed in are likely to persist though the day, with the clearest
skies to the west. There is some uncertainty as to how long
the clouds will hang on. We could even see some drizzle early,
espeicially nearer to the coast. Highs are expected to be
similar to today in eastern ma ri, but a few degrees cooler in
the ct valley, around 70.

Thursday night a surface low moving up through the great lakes
region will drag a warm front up through our region. Most of the
synoptic guidance keeps the majority of the rainfall to our
north but we'll see rain chances increase for northwestrn ma
late Friday night early Friday morning. WAA associated with this
front will potentially work to offset any radiational cooling we
can get if skies clear out enough, but right now temps look to
bottom out in the low to mid 50s.

Long term Friday through Wednesday
Highlights...

* a warm front will bring a few showers across north central
and western areas early fri
* a cold front approaches late fri, bringing scattered showers
and isolated thunderstorms especially across the interior
* large high pressure builds in from central and eastern canada
Saturday afternoon into Monday, bringing cool, dry conditions
overview...

19 12z guidance suite remains in rather good agreement with their
synoptic patterns through much of this weekend. The differences in
timing and amplitude of a potent mid level shortwave start to creep
into the forecast early next week. Main forecast theme for the
overall pattern continues. Nearly zonal flow transitions to weak
ridging Friday, then back to a more zonal flow this weekend. We may
see another brief warmup early next week as an upstream trough
amplifies a ridge over the northeast usa. Should this occur as
currently expected, we could be looking at widespread low
temperatures in the 40s Sunday night.

A low pressure moving across eastern canada should push its warm
front through our region Friday, with its cold front crossing our
region Friday night into Saturday morning. This has been a
consistent timing for these features. High pressure over northern
new england dominates this weekend. A pair of weak fronts could be
near our region early next week, but its a low confidence forecast.

Aviation 19z Wednesday through Monday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday night ...

2pm update...

low clouds MVFR ifr continue to gradually lift toVFR MVFR this
afternoon evening withVFR for much of the day in western
ct ma. Hi res models are showing some drier air being pulled
south along the coast and satellite imagery has shown some
indication of breaks in the clouds to our north. Drizzle has
come to an end across eastern ma. Modest NE winds persist with
highest winds across CAPE cod and nantucket with g25 kt at times
possible.

==============================================================
today... Moderate confidence.

Vfr vsbys across the region this afternoon. Across western ma ct
we haveVFR conditions, with moist northeast winds bringing a
mix of MVFR ifr CIGS at the moment to eastern ma and ri. Expect
ifr CIGS to to lift to MVFR for most everyone later this
afternoon evening before low clouds move back in overnight. Fog
should stay mostly isoldated to northeast ma. NE winds will gust
to 25 kts over the outer CAPE islands.

Tonight... Moderate confidence.

Areas of MVFR ifr CIGS likely redeveloping across the region.

Patchy fog possible, most likely across interior ma.

Thursday... Moderate confidence.

Improving toVFR, but areas of MVFR CIGS persisting over
cape islands.

Kbos terminal... Moderate confidence in MVFR CIGS lifting toVFR
this evening before coming down to ifr overnight.

Kbdl terminal... Moderate confidence. MainlyVFR conditions, but
MVFR CIGS possible for a few hours overnight.

Outlook Friday through Monday ...

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

Friday night: mainlyVFR, with areas MVFR possible. Windy with
gusts to 30 kt. Chance shra, isolated tsra.

Saturday:VFR. Breezy. Slight chance shra.

Saturday night through Sunday night:VFR.

Monday:

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday night ...

1030 am update...

not much change. Strongest NE winds up to 25 kt across the
waters south and east of CAPE cod and nantucket. This long fetch
will build seas 4 to 7 ft. Vsby 1-3 miles at times in spotty
drizzle and fog but improving this afternoon. Earlier discussion
below.

================================================================
through tonight... High confidence.

Northeast winds will increase through the day, gusting to 30 mph
in the south and eastern watern, higher to the southeast closer
to the low pressure center. Seas building to 5-6 ft. Waters
will be more tranquil further to the north. Wind gusts slowly
diminish Thursday morning.

Thursday... High confidence.

Ne winds decreasing through the day as high pressure builds
south. Seas will remain up to 5 ft over the eastern waters
through the day.

Outlook Friday through Monday ...

Friday: low risk for small craft advisory winds with areas of
gusts up to 30 kt. Seas up to 5 ft.

Friday night: moderate risk for small craft advisory winds with
gusts up to 30 kt. Local rough seas. Slight chance of rain
showers, isolated thunderstorms.

Saturday: low risk for small craft advisory winds with gusts up
to 25 kt. Local rough seas. Slight chance of rain showers.

Saturday night: winds less than 25 kt. Seas locally approaching
5 ft.

Sunday: winds less than 25 kt.

Sunday night: winds less than 25 kt. Seas locally approaching
5 ft.

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

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory until 2 am edt Thursday for anz232>235.

Small craft advisory until 8 pm edt Thursday for anz250-254.

Small craft advisory until 8 am edt Thursday for anz251-255-
256.

Synopsis... Belk bw
near term... Bw
short term... Bw
long term... Belk
aviation... Belk bw
marine... Belk nocera bw


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 9 mi41 min 67°F3 ft
WAXM3 - Waquoit Bay Reserve, MA 14 mi86 min 5.1 65°F 1014 hPa61°F
BZBM3 - 8447930 - Woods Hole, MA 20 mi41 min 65°F 72°F1013.6 hPa
44020 - NANTUCKET SOUND 23 mi31 min N 19 G 21 65°F 71°F1013.6 hPa60°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 35 mi81 min NNE 18 G 21 61°F 5 ft1014.2 hPa (+0.6)58°F
FRVM3 - 8447386 - Fall River, MA 36 mi41 min 65°F 73°F1014.8 hPa
FRXM3 37 mi41 min 65°F 61°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 37 mi41 min NNE 17 G 20 66°F 1014.3 hPa
BUZM3 - Buzzards Bay, MA 39 mi71 min NNE 19 G 21 65°F 1013.8 hPa (+0.8)
44013 - BOSTON 16 NM East of Boston, MA 40 mi81 min NNE 16 G 18 61°F 67°F4 ft1014.2 hPa (+0.5)58°F
NTKM3 - 8449130 - Nantucket Island, MA 40 mi41 min NNE 12 G 19 65°F 73°F1013.1 hPa
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 46 mi41 min NE 12 G 14 66°F 1014.3 hPa
CPTR1 - 8452944 - Conimicut Light, RI 46 mi41 min NNE 14 G 16 65°F 73°F1014.4 hPa
NAXR1 - Narragansett Bay Reserve, RI 46 mi86 min NE 9.9 68°F 1014 hPa64°F
PVDR1 47 mi41 min NNE 9.9 G 14 66°F 1014.9 hPa61°F
FOXR1 - 8454000 - Providence, RI 48 mi41 min ENE 12 G 14 65°F 70°F1014 hPa
NWPR1 - 8452660 - Newport, RI 48 mi41 min NNE 13 G 17 66°F 68°F1013.9 hPa

Wind History for Borden Flats Light at Fall River, MA
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NW1
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Otis Air National Guard Base, MA9 mi76 minNNE 11 G 1810.00 miOvercast63°F59°F88%1014.2 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA13 mi75 minNNE 11 G 228.00 miLight Rain66°F61°F84%1013.3 hPa
Plymouth, Plymouth Municipal Airport, MA16 mi79 minNNE 11 G 1710.00 miOvercast63°F59°F87%1014.4 hPa
Provincetown Municipal Airport, MA22 mi75 minNE 16 G 2010.00 miOvercast63°F57°F84%1014.3 hPa
Marshfield Airport, MA24 mi76 minNNE 7 G 128.00 miOvercast64°F59°F83%1014.6 hPa

Wind History from FMH (wind in knots)
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Last 24hrW8NW4NE4NE4CalmN4CalmCalmCalmCalmNE5NE3NE4N4NE6N5NE6N6NE11
G18
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NE12NE10
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1 day agoSW11
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SW12SW8SW6S4S4SW6SW5S4SW4SW7SW5S5S6S7S7
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2 days agoS7S7S7S5S4S4S4CalmCalmCalmCalmCalmCalmCalmCalmCalmSW6SW9SW9W12SW10
G16
SW9
G14
SW9
G15
SW14

Tide / Current Tables for Cape Cod Canal (East Entrance), Massachusetts
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Tide / Current data from XTide NOT FOR NAVIGATION
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Tide / Current Tables for Cape Cod Canal, Massachusetts Current
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Tide / Current data from XTide NOT FOR NAVIGATION
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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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (16,3,4,5)
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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.