Monday, August20, 2018 L-36.com


Marine Weather and Tides
Mashpee Neck, MA

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Sunrise 5:54AMSunset 7:34PM Monday August 20, 2018 5:08 AM EDT (09:08 UTC) Moonrise 3:44PMMoonset 12:46AM Illumination 65% Phase: Waxing Gibbous; Moon at 9 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- 347 Am Edt Mon Aug 20 2018
.small craft advisory in effect from 10 am edt this morning through this afternoon...
Today..NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Patchy fog this morning. A slight chance of showers this morning with vsby 1 to 3 nm.
Tonight..NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Patchy fog. Vsby 1 nm or less.
Tue..E winds 5 to 10 kt. Seas around 2 ft. Patchy fog. Vsby 1 to 3 nm.
Tue night..SE winds 5 to 10 kt. Seas around 2 ft. Showers likely.
Wed..SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 2 to 4 ft. Showers and tstms likely.
Wed night..W winds 10 to 15 kt with gusts up to 20 kt, becoming nw after midnight. Seas 2 to 4 ft. A chance of showers.
Thu..NW winds 5 to 10 kt. Seas 2 to 3 ft.
Thu night..W winds around 5 kt. Seas 2 to 3 ft.
Fri..W winds around 5 kt. Seas around 2 ft.
Fri night..S winds around 5 kt. Seas 1 foot or less. Winds and seas higher in and near tstms. 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 347 Am Edt Mon Aug 20 2018
Synopsis for massachusetts and rhode island coastal waters.. A high pressure ridge builds slowly S across the region today through Tue. The onshore flow will bring a few showers and patchy fog especially across the southern waters today. The ridge will push E Tue night, while low pres crosses the great lakes. As the low moves across the st. Lawrence river valley Wed, its associated fronts will cross the waters late Wed and Wed night. Large high pres will build across the waters Thu and Fri. 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 Mashpee Neck, MA
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location: 41.61, -70.44     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 200833
afdbox
area forecast discussion
national weather service boston norton ma
433 am edt Mon aug 20 2018

Synopsis
High pressure ridge from the maritimes into northern new
england and a stalled front to the south will combine to keep a
cool, northeast flow across southern new england through
tonight. Showers and thunderstorms are likely late Tuesday
night and Wednesday as a warm front lifts north into the area,
followed by a cold frontal passage. High pressure will bring
sunny skies and comfortable humidity Thursday and Friday. The
high moves off the coast next weekend but still will provide
mainly dry weather.

Near term until 6 pm this evening
Bands of showers continue to push onshore with the e-ne winds,
though they do not last too long, as they tend to weaken the
further W they go. Still noting -shra across S coastal areas,
including kmvy and kack, but should end by around 12z or so as
temps start to rise this morning. Noting winds have become light
n-ne, especially across the interior as high pressure ridge
begins to build S out of northern new england. So, will see
drier low level air work in.

For today, will see improving conditions across central mass
into the ct valley down to the boston and worcester by around
midday or early this afternoon, but lower clouds may linger
along the S coast with the continued onshore winds through most
of the day. Still can't rule out leftover showers and patchy fog
along the S coast, CAPE cod and the islands, but should push
off the coast and dissipate by around midday or early afternoon.

Ne winds will gust up to around 20 kt this morning thanks to
leftover pressure gradient from the building ridge to the n. So,
it will be a cool day with highs only in the lower 70s across e
coastal locations, but will range up to the upper 70s in the ct
valley.

Short term 6 pm this evening through 6 pm Tuesday
Tonight...

the high will settle across the region, bringing mostly clear
conditions across the interior. The coastal clouds will be
stubborn, though, and will linger especially across CAPE cod and
the islands. Temps will fall back to seasonal levels, bottoming
out from the mid to upper 50s across the interior valleys to
the lower-mid 60s along the coast. Some patchy fog may develop
for a time near the outer CAPE and nantucket overnight.

Tuesday...

the ridge will push E during Tuesday, while mid level winds
start to shift to s-sw. H5 trough digs as it moves NE across
the great lakes during the day. An associated rather strong
surface low will shift NE into southern ontario by Tue evening.

Some question whether any of the leading edge of the precip may
try to push into western areas during Tue afternoon, which will
depend upon how quickly (or slowly) the departing ridge will go.

For now, only carried low chance pops for the E slopes of the
berkshires late in the day. Expect high temps in the lower-mid
70s as winds shift to e-se during the day.

Long term Tuesday night through Sunday
Highlights...

* strong severe storms possible Tuesday night and Wednesday.

* sunshine with low humidity Thursday and Friday.

Overview...

large scale pattern features an upper trough over the northeast
through Thursday, followed by a building upper ridge Friday and
Saturday, which may break down a bit on Sunday. Aside from a brief
return of tropical humidity Tuesday night and Wednesday ahead of a
cold front, this setup favors near average temperatures but more
importantly brings our first stretch of more comfortable humidity
(dewpoints in 50s and 60s) later this week and into weekend. It
does appear that heat and humidity may very well return beyond
Sunday as a stronger upper ridge becomes more dominant from the
ohio valley to the mid-atlantic.

Details...

Tuesday night Wednesday morning...

after midnight, a warm front will be moving into southern
portions of southern new england. Dewpoints will rise into the
70s. Precipitable water values climb above 2 inches. Mlcape
increases to 500-1000 j kg and 0-1km helicity increases to near
100. K index rises to 36 across ct by 09z and moves off the se
ma coast by 15z.

Gfs is slower than nam,gem, and ECMWF in developing
thunderstorms. The 3km NAM shows some strong thunderstorms
developing along and ahead the warm front, mainly south of the
mass pike, late Tuesday night and early Wednesday morning. Upper
level winds will be strong enough... On order of 40 kt at 500
mb... To support potentially severe convection. Localized wind
damage flash flooding are main threats but with low lcls and
moderately high shear, we will have to keep a close eye out for
an isolated short-lived tornado, too, mainly south of the mass
pike toward daybreak Wednesday.

Wednesday afternoon...

initial wave of convection may be exiting the coast around noon.

However, a cold front will be moving through the region from
west to east. A line of showers and thunderstorms could form in
central ma and ri and progress eastward through the mid-
afternoon hours. A few storms could be strong, producing gusty
winds. Drier air and subsidence behind an upper level short wave
will bring an end to showers storms by late afternoon.

Thursday... Upper level trough cold pool is overhead. GFS is much
deeper and has a -17c temp at 500 mb, producing total totals (tt)
of 50+, but the ECMWF is much more tame with -11c and tt of 35
to 40. The cold air aloft will be outdone by the extremely dry
air in the column, however, as indicated by k indices near zero!
have included just a slight chance of a stray shower in
southeast ma, where a few 0.01" are indicated on various models.

Otherwise, skies should be mostly sunny. Highs in the upper 70s
to near 80 with delightful dewpoints in the comfortable 50s.

Friday... High pressure over the mid-atlantic builds into new
england. Sunny skies and highs in the lower 80s.

Saturday and Sunday... The high slips off to the east, allowing a
south to southwest flow of slightly more moist air. Partly cloudy
skies are expected. Warm advection and the approach of a short
wave trough aloft could lead to a few showers from time to time
but most of the weekend will be dry. Highs both days in the
lower 80s.

Aviation 08z Monday through Friday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday ... Moderate confidence
through 12z...

areas of ifr-lifr CIGS and MVFR-ifr vsbys across portions of ri
and E mass, with the lowest conditions from about kpvd-kuuu
eastward to the CAPE and islands will linger through 12z.

Elsewhere, mainlyVFR with a mix of MVFR conditions at times.

May see patchy -shra move onshore in the e-ne wind flow. Best
chance through 12z near and inside the i-495 beltway, possibly
into E ri at times.

Today... Moderate to high confidence.

MainlyVFR conditions away from the coast, with a mix of MVFR-
ifr CIGS and patchy fog with MVFR-ifr vsbys. Lowest conditions
mainly across the S coast, CAPE cod and the islands, which may
linger through most of the day especially on the mid and outer
cape as well as nantucket and martha's vineyard. Northeast gusts
to 20 knots mainly along the coastline.

Tonight... Moderate to high confidence.

Vfr conditions across most areas, though MVFR CIGS vsbys may
linger along S coastal areas through the night. May see patchy
fog develop inland around or after 05z with patchy MVFR-ifr
conditions.

Tuesday... Low to moderate confidence.

As winds shift to e-se, could see MVFR CIGS may return along the
s coast, which could push inland during the late morning or
afternoon. Timing uncertain.

Kbos terminal... Moderate confidence in taf.

MainlyVFR, but could see brief MVFR-ifr conditions through
11z-12z. NE wind gusting to 15-20 kt today. MVFR CIGS may return
late tonight, around or after 06z.

Kbdl terminal... High confidence in taf. MVFR CIGS through
around 9 am or so.

Outlook Tuesday night through Friday ...

Tuesday night: mainly MVFR, with areas ifr possible. Shra
likely, tsra likely.

Wednesday: mainly MVFR, with local ifr possible. Breezy. Shra
likely, tsra likely.

Wednesday night through Friday:VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday ... High confidence.

Ne winds through the period. Wind gusts up to around 25 kt this
morning into tonight across most of the open waters. Some of the
s sounds will also see gusts up to 25 kt through midday. Small
craft advisories remain in effect. Spotty light showers through
midday, but coverage will be very limited.

Seas up to 5 ft mainly across the outer waters through tonight
then will subside. Mainly good visibility.

Outlook Tuesday night through Friday ...

Tuesday night: winds less than 25 kt. Seas locally approaching
5 ft. Chance of rain showers, thunderstorms likely.

Wednesday: winds less than 25 kt. Local rough seas. Rain
showers likely, thunderstorms likely.

Wednesday night: winds less than 25 kt. Local rough seas.

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

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

Friday: winds less than 25 kt.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory from 10 am this morning to 4 pm edt this
afternoon for anz232.

Small craft advisory from 10 am this morning to 5 pm edt this
afternoon for anz235-237.

Small craft advisory until 11 pm edt this evening for anz250.

Small craft advisory until 5 am edt Tuesday for anz254-255.

Small craft advisory until 1 am edt Tuesday for anz256.

Synopsis... Evt gaf
near term... Evt
short term... Evt
long term... Gaf
aviation... Evt gaf
marine... Evt gaf


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WAXM3 - Waquoit Bay Reserve, MA 5 mi84 min 1.9 67°F 1018 hPa67°F
44020 - NANTUCKET SOUND 12 mi29 min NE 16 G 19 68°F 75°F1017.4 hPa67°F
BZBM3 - 8447930 - Woods Hole, MA 14 mi39 min 66°F 75°F1018.1 hPa
44090 17 mi129 min 66°F2 ft
NTKM3 - 8449130 - Nantucket Island, MA 29 mi45 min NE 8.9 G 13 67°F 74°F1017.2 hPa
BUZM3 - Buzzards Bay, MA 35 mi69 min NNE 18 G 21 67°F 1018.2 hPa (+0.0)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 39 mi39 min NNE 12 G 15 68°F 1018.5 hPa
FRVM3 - 8447386 - Fall River, MA 39 mi45 min 67°F 78°F1019.2 hPa
FRXM3 40 mi39 min 68°F 65°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 44 mi79 min NNE 16 G 18 66°F 5 ft1018.4 hPa (+0.0)65°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 48 mi45 min NE 12 G 15 68°F 1018.5 hPa
NWPR1 - 8452660 - Newport, RI 48 mi45 min NNE 8.9 G 13 67°F 69°F1018.2 hPa
NAXR1 - Narragansett Bay Reserve, RI 48 mi84 min NE 12 68°F 1019 hPa66°F
CPTR1 - 8452944 - Conimicut Light, RI 49 mi39 min NNE 11 G 13 67°F 76°F1018.7 hPa

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Otis Air National Guard Base, MA6 mi74 minNNE 153.00 miFog/Mist64°F64°F100%1018.3 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA10 mi73 minNNE 112.00 miLight Rain Fog/Mist67°F66°F97%1017.6 hPa
Marthas Vineyard Airport, MA17 mi76 minN 102.00 miLight Rain Fog/Mist67°F66°F100%1017.4 hPa

Wind History from FMH (wind in knots)
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1 day agoSW9
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2 days agoN4N3CalmNE3SE6S8SW5S6S10S10SW12SW12SW10
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Tide / Current Tables for Cotuit Highlands, Nantucket Sound, Massachusetts
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Cotuit Highlands
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Mon -- 12:46 AM EDT     Moonset
Mon -- 01:58 AM EDT     0.25 feet Low Tide
Mon -- 05:55 AM EDT     Sunrise
Mon -- 08:45 AM EDT     2.25 feet High Tide
Mon -- 02:10 PM EDT     0.42 feet Low Tide
Mon -- 03:43 PM EDT     Moonrise
Mon -- 07:34 PM EDT     Sunset
Mon -- 09:02 PM EDT     2.48 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.40.30.40.611.51.92.22.22.11.71.20.70.40.50.71.11.522.42.52.42

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
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Cape Cod Canal
Click for Map
Mon -- 12:47 AM EDT     Moonset
Mon -- 02:26 AM EDT     3.73 knots Max Flood
Mon -- 05:45 AM EDT     -0.18 knots Slack
Mon -- 05:55 AM EDT     Sunrise
Mon -- 08:25 AM EDT     -3.82 knots Max Ebb
Mon -- 11:39 AM EDT     0.17 knots Slack
Mon -- 02:51 PM EDT     3.57 knots Max Flood
Mon -- 03:44 PM EDT     Moonrise
Mon -- 06:03 PM EDT     -0.18 knots Slack
Mon -- 07:34 PM EDT     Sunset
Mon -- 08:52 PM EDT     -3.99 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.43.33.73.73.32.4-1.4-3.1-3.8-3.7-3.2-2.11.52.93.43.63.42.70.7-2.8-3.8-4-3.7-2.9

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 (5,6,7,8)
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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.