Sunday, July23, 2017 L-36.com


Marine Weather and Tides
Barnstable Town, MA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:26AMSunset 8:09PM Sunday July 23, 2017 2:58 AM EDT (06:58 UTC) Moonrise 5:40AMMoonset 8:21PM Illumination 0% Phase: New Moon; Moon at 29 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- 116 Am Edt Sun Jul 23 2017
Rest of tonight..E winds around 5 kt. Seas 1 foot or less. A chance of light rain.
Sun..NE winds 5 to 10 kt. Gusts up to 20 kt in the morning. Seas 1 foot or less. A chance of showers.
Sun night..E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Mon..E winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Showers likely.
Mon night..NE winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. A chance of showers.
Tue..N winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. A chance of showers.
Tue night..NE winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Wed..E winds 5 to 10 kt. Seas 2 to 3 ft.
Wed night..S winds 5 to 10 kt. Seas around 2 ft.
Thu..S winds 10 to 15 kt. Seas 1 foot or less.
Thu night..SW winds 5 to 10 kt. Seas 1 foot or less. A chance of showers. 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 Am Edt Sun Jul 23 2017
Synopsis for massachusetts and rhode island coastal waters.. A frontal boundary will remain south of the waters tonight and Sunday, the coastal waters will be in between high pressure building from canada to northern new england and low pressure emerging off the mid- atlantic coast. The low will pass southeast of the waters Sunday night. Additional waves of low pressure will pass over the southern waters Monday...moving east of the region Tuesday. Strong high pressure will be centered over the waters Wednesday. 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 230201
afdbox
area forecast discussion
national weather service taunton ma
1001 pm edt Sat jul 22 2017

Synopsis
Scattered light rain the heaviest of which will be along the
immediate s-coast into early Sunday morning. Cooler through the
day. Cool, damp and unsettled weather follows for Monday and
Tuesday with improvement Wednesday. Some showers and thunder-
showers possible again Thursday and Friday.

Near term until 6 am Sunday morning
10 pm update...

scattered light rain gradually concluding. The outcome of low to mid
level ascent N of the weak wave low along the quasi-stationary front
beneath shortwave energy and the right rear quadrant of the upper
level jet. But a fair amount of low level dry air discerned from the
23.0z soundings out of albany ny and gray me. Battle of airmasses n
to S along a roughly W to E quasi-stationary frontal boundary across
pa and off the nj coast. As energy pushes e, with heavier outcomes
skirting the s-waters of new england, high pressure is allowed to
build S with wake subsidence. Subsequent N flow, slightly cooler yet
notably drier air with dewpoints in the 50s slides s. A drying trend
towards morning, and perhaps some partial clearing N w, will see
lows drop into the 60s.

As to fog, there is still the potential along the s-coast, especially
nantucket, given expected wet-weather along with the low temperature-
dewpoint depressions. Thinking short-lived and eroding into the
morning period as winds turn N ushering drier air s. Some reduction
in visibility not out of the question as has already been observed
on nantucket.

Short term 6 am Sunday morning through Sunday night
Sunday...

low pressure will continue passing southeast of the region. It may
cause scattered showers, mainly along the south coast in the
morning. Then we should see a period of increasing sunshine
through mid afternoon. Light easterly wind flow will keep eastern ma
temperatures cool, in the low to mid 70s near the coast, but the
partial sunshine could allow the ct river valley to reach into the
80s. There is very little consensus on MAX temperatures for boston
tomorrow across the models. Given the easterly wind, it is likely
that boston will remain in the lower 70s for most of the day. The
gfs seems far too warm for the eastern coast, but could be correct
for the connecticut river valley where things will be able to heat
up a lot faster.

Sunday night...

skies will attempt to clear ahead of an approaching low pressure,
allowing for minimal radiational cooling. However, temperatures will
drop down into the low 60s, and even 50s in northern massachusetts.

Chances of showers increase again after midnight, mainly across
northern ct and western ma, ahead of advancing low pressure. The
main area of rain will likely not move into the region until
after 12z Monday. The NAM suggests that most of the area will remain
dry throughout the morning. However, guidance from the GFS and ecmwf
both agree on a late morning arrival. Opted to go more with the
gfs ECMWF timing, which was more in line with the previous forecast.

Areas of patchy fog are possible along the southern coast of new
england before midnight, and will likely persist and move northward
throughout the early morning hours.

Long term Monday through Saturday
Highlights...

* mon: below normal temps with some showers likely at times
* tue: a few leftover showers possible W below normal temps
* temps moderate mid to late next week but still below average
* another round of showers possible Thu thu night but not a washout
overview and model preferences...

synoptically there is little significant disagreement with the
mean jet remaining along the N conus, generally preventing
subtropical warmth moisture from reaching into new england
through the period. This suggests the continued thinking of
temperatures mainly at or below normal. Will be following this
trend with this update regardless of the preferred model
guidance. Initially weakening trof mon-tue will give way to
brief shortwave ridging as a second robust wave slides through
the mean jet from the pacnw later in the week. Therefore, an
unsettled start will give way to a brief dry period followed by
another short period of unsettled wx, pretty typical new england
summertime pattern when the mean jet rests this far s. Not
seeing significant enough differences in the overall pattern to
favor any one model. Therefore, will use a general consensus
blend for this update.

Details...

mon and tue...

early mon, will need to monitor the track of remnant
convection MCS which will moving ene from the oh valley into
ny pa. This convection looks to generate a weak cold pool low
pres which will slide near or just S of new england into early
tue. Given much of the initial convection will be driven by
mesoscale processes, confidence on how quickly any
precip storms associated will make it into new england. However,
with weakening shortwave moving in, the development of weak low
pres, as well as an increase in column moisture (pwats reach
1.25-1.50 inches), do expect to see on and off shra activity
much of Mon into early tue. E flow suggests sfc based convection
somewhat unlikely although as previous forecaster noted there
is modest instability aloft. Heights will be rising as the trof
weakens, which also may mitigate convective development.

Therefore, although unsettled, coverage will be showery with
breaks, with only a low risk for an isolated thunderstorm given
the mitigating factors. Otherwise, E flow and clouds will keep
highs mainly at or below normal, while overnight mins near
normal thanks to raised dwpts in the 60s.

Wed...

ridging will follow the exit of the weakened trof. As of now,
high pres associated with this ridging will have it's strongest
influence on wed, as it could give way enough to yield some
unsettled wx by thu. Subsidence and generally dry wx is
expected. Ridgeline is generally SW to NE oriented, suggest a
slight wedge of cooler air from the canadian maritimes.

Therefore in spite of more sunshine, highs will likely still
fall at or below normal.

Thu...

timing uncertainties for thu. As mentioned above, the weak
ridge and attendant sfc high pres will be sliding ene out of
the region, however the speed with which it does so will be
strongly dependent on how much deepening the approaching trof
undergoes. ECMWF is faster than the gfs, with ensembles on
either side. The faster solution would bring an afternoon cold
front through, with the possibility of showers and thunderstorms
while the slower solution favors a mainly dry forecast, keeping
the stronger forcing well upstream. Will feature some lower-end
pops for the possibility, but will need to monitor model shifts
temporally. Otherwise, a slight uptick in mid lvl temps, closer
to +13c or +14c at h85, suggest that with at least some sun
ahead of the approaching front, highs will reach near to
possibly even above normal in some spots.

Fri and sat...

cold front may linger fri, with the potential for
showers thundershowers remaining, however general consensus is
that it should be offshore by Fri night with a drier start to
next weekend. Temperatures near normal based on current forecast
mid lvl temp spread.

Aviation 02z Sunday through Thursday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday night ...

tonight... Moderate confidence.

MostlyVFR with sct -ra, the heaviest along the immediate s-coast.

Low risk MVFR-ifr for kack. Clearing out towards Sunday morning.

Sunday... High confidence.

Vfr. Sct shra linger along the islands early.

Sunday night... Moderate confidence.

Vfr conditions should deteriorate to MVFR-ifr late.

Kbos terminal...VFR. Sea-breezes forecast to move out around
00z-02z tonight.

Kbdl terminal...VFR, few showers 00z-03z with minimal changes
in category.

Outlook Monday through Thursday ... Moderate confidence.

Mon into early tue... Moderate confidence.

Mix of ifr MVFR conditions in a mix of low CIGS occasional shra
and fog. E winds, gusting to 25 kt near shore but weaker
inland. Winds shift to the N early Tue and begin to subside.

Can't rule out a few breaks toVFR, especially inland, but lower
categories likely dominate.

Late Tue into wed... High confidence.

Improvement toVFR with drier weather to follow, weakened w-ne
winds.

Thu... Moderate confidence.

MainlyVFR. Afternoon showers thunderstorms possible. Winds s,
may gust to around 20 kt.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday night ... High confidence.

Tonight...

winds shifting to the northeast as high pressure builds to our north
and low pressure passes to our south. Winds gust to 20 kt,
especially from CAPE ann to mass bay and provincetown. Waves 1-3 ft.

Sunday...

northeast winds continue at 15-20 kts with seas building to 3-4 ft.

Small chance of showers along the CAPE and islands.

Sunday night...

northeast winds will turn due east late, with sustained winds at 10
kts. Winds will gust up to 20 kts across the waters. Waves 3-4
ft.

Outlook Monday through Thursday ... Moderate confidence.

Mon and tue... Moderate confidence.

Low pres will be passing along the S waters late Mon into mon
night. Winds will shift from e, to NE then finally to N by tue.

Wind gusts during this time may gust to around 25 kt. Also, seas
mainly across the SE and E waters will reach about 5 ft as the
low pres passes. Therefore, small craft advisories may be
necessary. Showers and fog possible through the period.

Wed... High confidence.

Seas will subside, winds remain below 20 kt. Quiet boating
weather expected.

Thu... Moderate confidence.

S winds may gust to around 25 kt during the afternoon,
especially along the E coast. Small craft advisories may be
needed.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Belk doody correia
near term... Belk doody sipprell correia
short term... Belk correia
long term... Doody
aviation... Belk doody sipprell correia
marine... Belk doody sipprell correia


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WAXM3 - Waquoit Bay Reserve, MA 12 mi73 min 1 71°F 1008 hPa69°F
44090 15 mi54 min 66°F
44020 - NANTUCKET SOUND 15 mi68 min 72°F1 ft1007.4 hPa (-0.8)
BZBM3 - 8447930 - Woods Hole, MA 20 mi46 min 72°F 73°F1007 hPa
NTKM3 - 8449130 - Nantucket Island, MA 26 mi46 min E 1 G 1.9 70°F 76°F1007.3 hPa
BUZM3 - Buzzards Bay, MA 42 mi58 min NNE 7 G 7 71°F 1007.4 hPa (-1.5)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi46 min NNW 2.9 G 2.9 75°F 1006.6 hPa
FRXM3 46 mi46 min 74°F 69°F
FRVM3 - 8447386 - Fall River, MA 46 mi46 min 74°F 76°F1007.9 hPa

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 mi62 minN 09.00 miFair71°F68°F90%1007.4 hPa
Otis Air National Guard Base, MA11 mi63 minN 010.00 miMostly Cloudy70°F68°F94%1007.8 hPa
Chatham, Chatham Municipal Airport, MA18 mi66 minN 010.00 miFair71°F69°F94%1008.2 hPa
Marthas Vineyard Airport, MA22 mi65 minN 08.00 miOvercast69°F66°F93%1007.2 hPa

Wind History from HYA (wind in knots)
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Last 24hrW5NW7NW6NW3NW3NW6N8N7N5NW4S54S5S5S444S3SE3S4S4SW4CalmCalm
1 day agoSW5W3W4W3NW7NW6NW6NW7NW5Calm6SW11SW10SW12SW12SW8W16W11W6W6W5SW5W7W6
2 days agoW4W5CalmCalmCalmCalmNW4W3SE4SW6SW8SW12SW11SW13SW14SW11SW10SW14SW13
G19
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Tide / Current Tables for Hyannis Port, Nantucket Sound, Massachusetts
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Hyannis Port
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Sun -- 12:05 AM EDT     3.90 feet High Tide
Sun -- 05:27 AM EDT     Sunrise
Sun -- 05:39 AM EDT     Moonrise
Sun -- 05:47 AM EDT     New Moon
Sun -- 06:09 AM EDT     -0.63 feet Low Tide
Sun -- 12:46 PM EDT     3.43 feet High Tide
Sun -- 06:22 PM EDT     -0.33 feet Low Tide
Sun -- 08:07 PM EDT     Sunset
Sun -- 08:20 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.93.7320.8-0.2-0.6-0.40.211.82.73.33.43.12.31.30.3-0.3-0.20.41.22.13

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Sun -- 12:05 AM EDT     -1.97 knots Max Ebb
Sun -- 03:16 AM EDT     0.00 knots Slack
Sun -- 05:26 AM EDT     Sunrise
Sun -- 05:38 AM EDT     Moonrise
Sun -- 05:47 AM EDT     New Moon
Sun -- 06:50 AM EDT     2.32 knots Max Flood
Sun -- 10:00 AM EDT     -0.00 knots Slack
Sun -- 12:43 PM EDT     -1.83 knots Max Ebb
Sun -- 03:51 PM EDT     0.00 knots Slack
Sun -- 07:12 PM EDT     2.00 knots Max Flood
Sun -- 08:06 PM EDT     Sunset
Sun -- 08:18 PM EDT     Moonset
Sun -- 10:10 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2-1.8-1.2-0.30.81.72.22.321.20-1.1-1.7-1.8-1.5-0.80.21.11.721.91.30.2-1

Weather Map and Satellite Images
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Weather Map
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IR Satellite Image from GEOS
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GOES Local Image of Northeast    EDIT
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Wind Forecast for Boston, MA (2,6,7,8)
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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.