Saturday, August18, 2018 L-36.com


Marine Weather and Tides
Barnstable Town, MA

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Sunrise 5:52AMSunset 7:37PM Saturday August 18, 2018 12:30 PM EDT (16:30 UTC) Moonrise 1:49PMMoonset 12:00AM Illumination 47% Phase: First Quarter Moon; Moon at 7 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- 1006 Am Edt Sat Aug 18 2018
This afternoon..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 1 to 2 ft. A chance of showers with a slight chance of tstms. Some tstms may produce gusty winds and heavy rainfall.
Tonight..NW winds 5 to 10 kt, becoming N 10 to 15 kt with gusts up to 20 kt after midnight. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Sun..NE winds 10 to 15 kt with gusts up to 25 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Sun night..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers.
Mon..NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers.
Mon night..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.
Tue..E winds 5 to 10 kt. Seas 2 to 3 ft.
Tue night..SE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Wed..S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Wed night..W winds 10 to 15 kt. Seas 2 to 3 ft. 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 1006 Am Edt Sat Aug 18 2018
Synopsis for massachusetts and rhode island coastal waters.. Low pres will move across northern new england today, pushing its associated cold front across the waters. The front will stall across the southern waters tonight through Mon, with weak low pres waves moving along it. However the low will generate ne winds up to 25 kt at times especially across the southern waters. The high will build N of the waters through Tue. Another front will approach the waters during Wed. 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 Barnstable Town, MA
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location: 41.63, -70.31     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 181423
afdbox
area forecast discussion
national weather service boston norton ma
1023 am edt Sat aug 18 2018

Synopsis
A cold front sweeps through the region this afternoon and
evening with scattered showers and thunderstorms. Weak waves of
low pressure will develop along the front off the south coast,
which may bring a few showers at times along with cooler
temperatures Sunday into Monday, especially near the coast.

High pressure returns Tuesday, but another approaching front
will more showers and thunderstorms Tuesday night into
Wednesday. Dry and seasonable weather follows Thursday into
Friday as high pressure builds into the region.

Near term until 6 pm this evening
* potential for strong thunderstorms which may produce localized
flooding and gusty winds from midday through early evening *
10 am update...

at 10 am showers were crossing southern vt and central nh. Per
mslp fields, this lines up well with the position of the cold
front. South of the showers the winds are south to southwest and
dews are 70-75; north of the showers winds are northwest to
north and dews are in the 60s.

Short-term guidance continues to show probable showers t-storms
crossing southern new england this afternoon and evening and
reaching the south coast around 8 pm. 09z SREF showed a 70 pct
chance of capes over 1000 j kg and 95 pct chance of this across
ct-ri-se mass. Upper winds are marginal, with 12z soundings
showing 35 kt winds at 500 mb around the area and forecast to
diminish during the afternoon. Winds at 850 mb are forecast at
20-25 kt and diminish by evening. Precip water values at chh
this morning were 2.08 inches, and similar values linger ahead
of the cold front through afternoon, then retreat south by
evening.

We will continue the forecast of showers tstms for the
afternoon evening. A few storms may reach severe damaging
levels. Moisture values continue to support local downpours as
well.

Temps aloft show 18c at 900 mb (13c equiv) and 17c at 850 mb.

This supports current forecasts of 80-85f MAX temps, but also
hints at upper 80s if sufficient clearing develops and allows
mixing up to 850 mb. Dew points 70-75 will linger until the cold
front moves through.

Short term 6 pm this evening through 6 pm Sunday
Tonight and Sunday...

the cold front will ride along or just off the south coast
tonight. Low pressure waves will move along the front, which
will keep chance for precip going. However, most of the
instability pushes offshore. Still noting k indices in the
lower-mid 30s tonight, so can't totally rule out any
thunderstorms, but will not be as strong. Pwats will slowly fall
across central and northern areas, but will linger at around 2
inches along the S coast, so might see some downpours there off
and on through the night. Temps will bottom out from 60-65
across the higher inland terrain, ranging to near 70 along the
immediate S coast.

With the weak waves of energy moving along the nearly
stationary front to the S on Sunday, will still see scattered
showers and maybe a thunderstorm or two during the day. It will
still be rather humid with dewpoints in the lower-mid 60s,
highest S of the mass pike. Temps will be cooler though, only
topping off at 70 to 75.

Long term Sunday night through Friday
Highlights...

* mainly dry Mon Tue with temps a bit below normal. Low risk for a
shower near the coast mon
* increasing humidity with showers and sct t-storms Tue night wed
* mainly dry and seasonable Thu into Fri with comfortable humidity
Sunday night into Tuesday...

weak wave of low pressure tracks south of new eng from the mid atlc
coast through Monday. ECMWF has trended south and is now more in
line with GFS nam keeping deepest moisture south of new eng.

However, northern extent of deeper moisture may reach SE new eng
where pwats still around 1.5 inches. As a result can't rule out a
few showers across ri and SE ma, especially Sun night into early
mon, then drying as low pres pulls away and high pres noses down
from maine. On tue, mid level ridging briefly moves into the region
with high pres in control. Temps a bit below normal Mon Tue with
easterly flow persisting.

Tuesday night into Wednesday...

upstream mid level trough approaches from the west with attending
cold front expected to sweep across the region wed
afternoon evening. Pwat plume ahead of the front increases to 2+
inches combined with moderate instability and modest forcing for
ascent will result in a period of showers and sct t-storms moving
through sometime later Tue night into wed. Pwat and low level wind
anomalies 2+ sd above climo which indicates potential for some heavy
rainfall. A return of 70+ dewpoints likely.

Thursday into Friday...

cold front will be offshore by Thu with high pres and drier airmass
moving into the region. Expect dry weather and seasonably warm temps
with comfortable humidity levels as dewpoints may fall into the
50s.

Aviation 14z Saturday through Wednesday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday ...

this afternoon... Moderate to high confidence.

MainlyVFR conditions, but will see brief MVFR-ifr in
showers sct thunderstorms 18-00z from north to south as a cold
front moves through the region.

Tonight... Moderate confidence.

Winds shift to n-nw early tonight, then veer to NE behind the
passing cold front. Expect conditions to lower to MVFR, and
possibly ifr in spots. Scattered showers.

Sunday... Moderate confidence.

Areas of MVFR-ifr CIGS linger along coastal areas, lowest on
cape cod and the islands for most of the day. Otherwise, mainly
vfr with pockets of MVFR cigs. Best conditions across N central
and NW mass. Gusty NE winds mainly along the coast.

Kbos terminal... Moderate confidence in taf. A brief period of
lower conditions in showers t-storms expected this afternoon.

Kbdl terminal... High confidence in taf. A brief period of
lower conditions in showers t-storms expected this afternoon.

Outlook Sunday night through Wednesday ...

Sunday night: mainly MVFR, with localVFR possible. Breezy.

Slight chance shra.

Monday: mainlyVFR, with local MVFR possible. Breezy.

Monday night: mainlyVFR, with local MVFR possible.

Tuesday: mainly MVFR, with areasVFR possible. Slight chance
shra.

Tuesday night: mainly MVFR, with areas ifr possible. Chance
shra, chance tsra.

Wednesday: mainly MVFR, with local ifr possible. Chance shra,
chance tsra.

Marine
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... S-sw winds gusting up to 20 kt through midday.

Seas 3 feet or less. Scattered showers t-storms, may see gusty
winds and heavy rain. Reduced visibility and locally choppy seas
in any showers or storms.

Tonight and Sunday... With cold front passing this evening, winds
shift to n-nw this evening, then shift to NE around or after
midnight. Gusts increase to 25 kt during the early morning hours
Sunday on the open waters, then across ri bi sounds and
mass ipswich bays by Sunday morning. Chance for showers and
thunderstorms continue, with the best shot across the southern
waters.

Outlook Sunday night through Wednesday ...

Sunday night: winds less than 25 kt. Seas up to 5 ft. Chance of
rain showers.

Monday: low risk for small craft advisory winds with gusts up
to 20 kt. Seas up to 5 ft. Slight chance of rain showers.

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

Tuesday night: winds less than 25 kt. Areas of seas approaching
5 ft. Chance of rain showers.

Wednesday: winds less than 25 kt. Seas up to 5 ft. Chance of
rain showers, chance of thunderstorms.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory from noon to 6 pm edt Sunday for anz233-
234.

Small craft advisory from 5 am to 6 pm edt Sunday for anz235-
237-250-256.

Small craft advisory from 8 am to 6 pm edt Sunday for anz251-
255.

Small craft advisory from 10 am to 6 pm edt Sunday for anz254.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 10 mi20 min SW 16 G 19 77°F 1009.4 hPa73°F
WAXM3 - Waquoit Bay Reserve, MA 12 mi45 min 1.9 81°F 1010 hPa79°F
44090 15 mi90 min 68°F1 ft
BZBM3 - 8447930 - Woods Hole, MA 20 mi36 min 77°F 76°F1009.9 hPa
NTKM3 - 8449130 - Nantucket Island, MA 26 mi36 min SW 8.9 G 15 80°F 78°F1009.8 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 41 mi40 min SW 7.8 G 7.8 71°F 1 ft1009 hPa (-0.8)71°F
BUZM3 - Buzzards Bay, MA 42 mi30 min SW 15 G 16 73°F 1010 hPa (-1.2)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi30 min SW 11 G 12 78°F 1009.2 hPa (-1.3)
FRVM3 - 8447386 - Fall River, MA 46 mi36 min 79°F 78°F1010 hPa
FRXM3 46 mi30 min 79°F 73°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, MA4 mi34 minSW 157.00 miA Few Clouds81°F75°F82%1009 hPa
Otis Air National Guard Base, MA11 mi35 minSW 1410.00 miMostly Cloudy79°F73°F84%1009.8 hPa
Chatham, Chatham Municipal Airport, MA18 mi38 minSW 11 G 188.00 miOvercast81°F75°F82%1009.7 hPa
Marthas Vineyard Airport, MA22 mi37 minWSW 98.00 miMostly Cloudy80°F75°F85%1009.7 hPa

Wind History from HYA (wind in knots)
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1 day agoW6SW10SW14SW11SW11W9W5W3N4CalmCalmCalmCalmCalmCalmCalmCalmCalmNE3CalmE4S6S65
2 days agoN6NE5N5S5SW9SW7SW6SW6W6W6W7W6SW5SW4W4W5W4W4W5W5W6NW7W7W6

Tide / Current Tables for Hyannis Port, Nantucket Sound, Massachusetts
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Hyannis Port
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Sat -- 03:49 AM EDT     First Quarter
Sat -- 05:52 AM EDT     Sunrise
Sat -- 06:31 AM EDT     3.08 feet High Tide
Sat -- 12:04 PM EDT     0.17 feet Low Tide
Sat -- 01:48 PM EDT     Moonrise
Sat -- 06:56 PM EDT     3.26 feet High Tide
Sat -- 07:36 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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00.30.81.322.6332.621.20.50.20.40.81.31.92.63.13.332.51.70.9

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
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Sat -- 12:37 AM EDT     1.94 knots Max Flood
Sat -- 03:39 AM EDT     -0.00 knots Slack
Sat -- 03:49 AM EDT     First Quarter
Sat -- 05:51 AM EDT     Sunrise
Sat -- 06:24 AM EDT     -1.60 knots Max Ebb
Sat -- 09:32 AM EDT     0.00 knots Slack
Sat -- 01:07 PM EDT     1.88 knots Max Flood
Sat -- 01:47 PM EDT     Moonrise
Sat -- 04:05 PM EDT     -0.00 knots Slack
Sat -- 06:55 PM EDT     -1.61 knots Max Ebb
Sat -- 07:35 PM EDT     Sunset
Sat -- 10:04 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.91.91.50.7-0.4-1.2-1.6-1.5-1.2-0.50.41.21.71.91.71.10.1-0.9-1.4-1.6-1.4-0.9-0.10.8

Weather Map and Satellite Images
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Wind Forecast for Boston, MA (12,3,4,5)
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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.