Sunday, May28, 2017 L-36.com


Marine Weather and Tides
West Chatham, MA

Version 3.4
What's New / NOTES
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 5:08AMSunset 8:08PM Sunday May 28, 2017 6:36 AM EDT (10:36 UTC) Moonrise 8:08AMMoonset 11:05PM Illumination 9% Phase: Waxing Crescent; Moon at 3 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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ANZ254 Coastal Waters From Provincetown Ma To Chatham Ma To Nantucket Ma Out 20 Nm- 408 Am Edt Sun May 28 2017
Today..SE winds around 5 kt...increasing to 5 to 10 kt this afternoon. Seas 2 to 3 ft.
Tonight..SE winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 nm or less.
Mon..SE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Patchy fog. Showers likely. Vsby 1 nm or less.
Mon night..E winds 10 to 15 kt...diminishing to 5 to 10 kt after midnight. Gusts up to 20 kt. Seas 3 to 5 ft. Patchy fog. A chance of showers. Vsby 1 nm or less.
Tue..E winds around 5 kt. Seas 2 to 4 ft.
Tue night..S winds 5 to 10 kt. Seas 2 to 3 ft.
Wed..SW winds 5 to 10 kt. Seas 2 to 3 ft.
Wed night..SW winds around 10 kt. Seas 2 to 4 ft.
Thu..W winds 5 to 10 kt. Seas 2 to 4 ft.
Thu night..W winds around 10 kt. Seas 2 to 4 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 408 Am Edt Sun May 28 2017
Synopsis for massachusetts and rhode island coastal waters.. Rather tranquil boating conditions today into tonight. A low pres will approach from the W Mon...with a secondary low pres forming off the mid atlc coast Mon night...then passing se of nantucket on Tue. A cold front will approach from the W on Wed...passing E of the waters on Thu. 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 West Chatham, MA
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location: 41.73, -69.97     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 280752
afdbox
area forecast discussion
national weather service taunton ma
352 am edt Sun may 28 2017

Synopsis
A weak ridge of high pressure will keep most of southern new
england dry into tonight. Possibility of a few showers across
the western half of southern new england, especially toward
northwest ma. Low pressure in the great lakes generates a
coastal low late Monday that passes off nantucket Tuesday. This
will bring wet weather for memorial day. Upper low and cold
pool linger nearby most of next week, while surface high
pressure builds in. Expect daytime clouds and scattered showers
will pop up each day Tuesday through Friday. Otherwise fair
weather with near seasonable temperatures.

Near term until 6 pm this evening
Lots of clouds today, but thinking there should be at least a
few breaks from time to time, especially toward the east coast.

Light south winds should help boost temperatures despite the
clouds, especially away from the immediate south coast. Thinking
a seabreeze will develop along the east coast, too, but it
should be more temporary.

Short term 6 pm this evening through 6 pm Monday
Showers should diminish this evening. Then more widespread
showers start to approach from the west after midnight. Still
appears rainfall is most likely from mid morning into early
afternoon. While an occluded front will not quite make it into
our region, a secondary low pressure should develop and pass
south of new england Monday.

Convective parameters still show a destabilizing airmass at
most layers. Mid level lapse rates remain sufficient to keep a
mention of isolated thunderstorms in the forecast Monday.

Long term Monday night through Saturday
Highlights...

* unsettled weather pattern with hit or miss showers.

* seasonable temperatures through the period with slightly below
average for the end of the week.

* hints of a drying trend for the weekend, but confidence is low.

Pattern details...

the model guidance remains relatively agreeable in showing
persistent upper troughing across the northeast with high
amplitude ridging in the west and northern plains. The ridge
does diffuse on Friday into Saturday as troughing develops in
pacific NW which could relax the mass fields drying trend over
the ne. Still a lot of uncertainty with this outcome.

Temperatures...

broad upper level trough over the region will keep any summer-
like heat at bay through the period. Generally seasonable
conditions on Tuesday and Wednesday thanks to southwest flow
aloft and thermal ridge. This will result in high temps in the
70s. Depending on how much Sun we can generate, cannot rule out
a spot 80 temp on Wednesday due to strong mixing. Mid-level wave
and associated front on Thursday drop temps aloft to well below
average for late may. GEFS indicate this is close to 2 std below
normal. This will result in cooler than normal temperatures for
Thursday and into Friday. There is the potential that next
Saturday may trend a bit warmer as upper level trough begins
to exit the region. However, the low could linger a bit longer
into next weekend as the ec indicates. Thus low confidence on
the weekend temperatures. Overnight lows will linger in the 50s
through the period.

Precipitation...

spot shower or two on Monday night as coastal low south of the
region moves eastward. Dry weather for the first half of Tuesday
before another shortwave move through the area during the later
half of the day resulting in showers. Southwest flow aloft
combined with building LLJ ans some elevated instability,
could see some heavy rain and or thunderstorms during the
evening lasting into the overnight hours.

Multiple disturbances will move through the mean trough as it
settles in across the region through the rest of the work week:
Wednesday through Friday. Very difficult to time disturbances
and resulting precipitation chances. So will mention higher
chances for showers during the more diurnally favored daylight
hours, with slightly lower pops at night. Only day where a
drying trend could occur is on Thursday thanks to northwest flow
aloft bring in drier air. Still large spread in the guidance
for the weekend so a low confidence. &&

Aviation 07z Sunday through Thursday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Monday ...

today... Moderate confidence. MVFR to perhaps some localized ifr
conditions early should improve to mainlyVFR by afternoon,
despite a scattered to broken deck of clouds persisting and
perhaps a brief spot shower or two.

Tonight... Moderate confidence. MainlyVFR conditions for much
of the night. However, some lower conditions may arrive toward
daybreak Monday especially across the interior depending on the
timing of rain showers.

Monday... Showers move in during the day with isolated thunder.

Cigs and vsbys lower fromVFR early to MVFR and areas of ifr in
the afternoon and night. Southeast winds less than 20 knots
except gusts to 25 possible late in the day on the CAPE and
islands. The wet weather diminishes Monday night, but expect
lingering fog low clouds drizzle during the night... Especially
over eastern central mass and ri.

Kbos taf... High confidence in taf. SE seabreeze should
redevelop by late morning or early afternoon. MainlyVFR, but
there is a potential for a period of lower clouds prior to 15z
today.

Kbdl taf... High confidence in taf. MainlyVFR.

Outlook Monday night through Thursday ... Moderate confidence.

Monday night into Tuesday...

lingering ifr in fog drizzle early in ri and eastern ma.

Conditions trending toVFR all areas. Potential for brief MVFR
vsbys in scattered showers in the afternoon especially over
western central ma. South winds remain less than 20 knots.

Isolated thunder possible.

Wednesday-Thursday...

vfr. Scattered afternoon showers. Westerly winds with gusts less
than 20 knots.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Monday ...

today and tonight... High confidence. Weak ridge of high pressure
will keep winds seas below small craft advisory thresholds.

Monday... High confidence. An approaching low pressure south of
new england will increase the pressure gradient toward daybreak.

Enough southeast fetch may develop across our southwest
outermost waters for some marginal 5 foot seas starting around
12z Monday. It is still too early to hoist any marine headlines
for a marginal 3rd period event.

Outlook Monday night through Thursday ... Moderate confidence.

Monday night into Tuesday...

seas relaxing below 5 feet through the timeframe as NE winds
back to the south. Gusts remain below 20 kts. Vsbys lowered in
showers and iso thunder.

Wednesday through Thursday...

winds less than 25 knots and seas less than 5 feet through the
period. Scattered afternoon showers possible.

Tides coastal flooding
Latest observations show a lingering surge about 0.7-0.9 feet
above normal tides. We did have a few minor coastal flood
reports very early this morning along the eastern ma coast. The
higher of the two high tides today will be around midnight
Monday. As we are even further removed from the highest of the
recent high tides, will let the next shift reevaluate the need
for another coastal flood advisory or statement. Any coastal
flooding should be minimal.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Belk dunten
near term... Belk
short term... Belk
long term... Dunten
aviation... Belk dunten
marine... Belk dunten
tides coastal flooding... Belk


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 20 mi62 min 53°F
44020 - NANTUCKET SOUND 23 mi46 min 52°F1 ft1013.6 hPa (+0.0)
NTKM3 - 8449130 - Nantucket Island, MA 31 mi48 min S 4.1 G 5.1 51°F 59°F1013.6 hPa
WAXM3 - Waquoit Bay Reserve, MA 31 mi111 min 1.9 55°F 51°F
BZBM3 - 8447930 - Woods Hole, MA 40 mi48 min 56°F 57°F1013.1 hPa

Wind History for Nantucket Island, MA
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N4
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E17
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chatham, Chatham Municipal Airport, MA2 mi44 minN 010.00 miA Few Clouds50°F48°F93%1014.4 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA17 mi40 minSE 310.00 miMostly Cloudy53°F50°F89%1013.2 hPa
Provincetown, Provincetown Municipal Airport, MA23 mi40 minSE 310.00 miFair52°F48°F89%1014.1 hPa

Wind History from CQX (wind in knots)
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Last 24hr444NW7W56NE11NE74NE6E6E6E4S3CalmSW3CalmCalmCalmCalmCalmS3CalmCalm
1 day agoS4SW9
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NW7NW63CalmNE3CalmCalmCalmN3CalmNW3CalmN433
2 days agoE10E12
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E12NE8E9NE9E84E5E4SE45SE7SW5S9
G16
S4545

Tide / Current Tables for Pleasant Bay, Quonset Pont, Massachusetts
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Pleasant Bay
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Sun -- 04:05 AM EDT     4.17 feet High Tide
Sun -- 05:09 AM EDT     Sunrise
Sun -- 08:09 AM EDT     Moonrise
Sun -- 11:09 AM EDT     -0.68 feet Low Tide
Sun -- 04:42 PM EDT     3.60 feet High Tide
Sun -- 08:05 PM EDT     Sunset
Sun -- 11:04 PM EDT     Moonset
Sun -- 11:25 PM EDT     -0.16 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.51.52.73.74.23.93.22.31.50.6-0.2-0.7-0.40.31.52.63.43.63.22.51.91.10.4-0.1

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Sun -- 02:15 AM EDT     -2.15 knots Max Ebb
Sun -- 05:10 AM EDT     Sunrise
Sun -- 05:25 AM EDT     0.00 knots Slack
Sun -- 08:09 AM EDT     Moonrise
Sun -- 08:48 AM EDT     2.42 knots Max Flood
Sun -- 12:11 PM EDT     -0.01 knots Slack
Sun -- 02:50 PM EDT     -2.00 knots Max Ebb
Sun -- 06:01 PM EDT     0.00 knots Slack
Sun -- 08:04 PM EDT     Sunset
Sun -- 09:12 PM EDT     2.02 knots Max Flood
Sun -- 11:04 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.6-1.6-2.1-2-1.4-0.50.71.72.32.42.11.40.2-1-1.8-2-1.7-1-011.721.91.4

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
Geos

Wind Forecast for Boston, MA (6,6,7,8)
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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.