Monday, May29, 2017 L-36.com


Marine Weather and Tides
Brewster, 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 Monday May 29, 2017 1:06 PM EDT (17:06 UTC) Moonrise 9:15AMMoonset 11:54PM Illumination 18% Phase: Waxing Crescent; Moon at 4 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- 1023 Am Edt Mon May 29 2017
.small craft advisory in effect until 8 pm edt this evening...
This afternoon..E winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Rain likely. Patchy fog with vsby 1 nm or less.
Tonight..NE winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. A chance of rain with patchy drizzle. Vsby 1 nm or less.
Tue..E winds around 5 kt...becoming se 10 to 15 kt in the afternoon. Seas 1 foot or less.
Tue night..S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas 1 foot or less. Patchy fog. A chance of showers. Vsby 1 nm or less.
Wed..S winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 nm or less.
Wed night..SW winds 5 to 10 kt. Seas around 2 ft.
Thu..W winds 5 to 10 kt. Seas 1 foot or less.
Thu night..W winds 5 to 10 kt. Seas 1 foot or less.
Fri..SW winds 10 to 15 kt. Seas 1 foot or less. A chance of showers.
Fri night..SW winds 5 to 10 kt. Seas around 2 ft. 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 1023 Am Edt Mon May 29 2017
Synopsis for massachusetts and rhode island coastal waters.. Low pres will move across the southern waters today...passing southeast of nantucket tonight. Weak high pres will follow Tue shifting east Tue night. A cold front will approach from the west on Wed...passing E of the waters on Thu. Southwesterly winds will follow on 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 Brewster, MA
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location: 41.77, -70.08     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 291426
afdbox
area forecast discussion
national weather service taunton ma
1026 am edt Mon may 29 2017

Synopsis
A fast moving low pressure system will bring a period of showers to
the region today, however a washout is not expected. Onshore
winds, clouds and showers will result in unseasonably cool
temperatures today. A couple of weak cold fronts may trigger
scattered showers and possibly thunderstorms for the remainder
of the week from to time to time. Otherwise fair weather with
near seasonable temperatures are expected into next weekend.

Near term until 6 pm this evening
1020 am update...

continue to have two areas of rain, one moving into western new
eng assocd with a mid level shortwave lifting NE from ny pa
border, with second area along the south coast. Dry air above
the boundary layer holding the rain off across northern and ne
ma. Coastal low off the de coast forecast to move east today
with core of low level jet remaining offshore so rain area along
the coast will struggle to move northward. We do expect some
light rain to eventually fill in across northern and NE ma this
afternoon as mid level shortwave lifts NE across central new eng
and the column moistens. However, the rain will likely be
scattered in this region where least amount of QPF expected,
likely less than 0.10". Mid level dry slot moves into the region
from the west late afternoon and evening which will bring an
end to the rain. Updated pops to reflect near term trends.

Unseasonably chilly day with temps remaining in the 50s. But
close to 50 degrees east coastal ma which is about 20 degrees
below normal for this region.

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

shortwave and deeper moisture will have exited the region by this
evening. However, moist northeast low level flow will probably allow
scattered light showers drizzle to persist into the overnight hours.

Highest confidence is across eastern ma but cannot rule out for
points west due to upslope flow. Aside from drizzle, anticipate
areas of low clouds and patchy fog to persist as low level moisture
may remain trapped below the inversion. Low temps will mainly be in
the upper 40s to the lower 50s.

Tuesday...

weak ridging aloft on Tuesday will keep the region in southwesterly
flow as weak surface high pressure moves south of the region. The
area will remain mostly dry but cannot rule out a few isolated
showers out west.

A quick moving shortwave will pass through the flow during the day
which could trigger showers and perhaps a thunderstorm or two.

Highest confidence is out west where better instability resides.

Some hi-res guidance supports the storms that develop in update ny
will moves into the region by late afternoon evening. This is in
conjunction with SPC marginal risk.

Tricky temperature forecast for Tuesday as 850 mb temps support
warmer conditions then what guidance is indicating. However 925 mb
temps show that the maritime airmass will remain locked in over sne
until the later half of the day. Despite some heating in a mix of
sun and clouds, temperatures will remain in the upper 60s to low
70s.

Long term Tuesday night through Sunday
Highlights...

* temperatures near normal this period with summer heat and humidity
remaining suppressed well south of new england
* several episodes of showers but also many hours of dry weather too
synoptic overview...

both GFS and ec ensembles support a slow moving omega block pattern
moving across canada this week into next weekend, resulting in
cyclonic flow and below normal heights over new england. This
suppresses the subtropical ridge across the southern states,
precluding summer heat and humidity from advecting northward into
new england. Thus temps here close will be near normal this period
for southern new england. As for precip, cyclonic flow into the
northeast will yield several short wave troughs and attending cold
fronts sweeping across the region resulting in a few chances for
showers and thunderstorms, but also many hours of dry weather too.

Above average forecast confidence on the overall pattern theme but
high uncertainty on timing each individual short waves fronts and
associated timing of shower threat.

Daily details...

tue night...

short wave trough accompanied by modest forcing for ascent coupled
with sufficient deep layer moisture to support numerous showers,
especially late evening and overnight. South to southeast winds will
result in onshore winds and weak low level warm advection. Thus
temps will not be as cool as previous nights.

Wednesday...

warmer than today and Tue with highs well into the 70s as maritime
airmass moves offshore. Deep layer moisture and forcing for ascent
over the area in the morning resulting in a risk for showers.

However by late morning and especially the afternoon k indices fall
rapidly indicating mid level dry beginning to stream across the
region and dry the column from the top down. This drier air aloft
does steepen mid level lapse rates however it appears the dry air
becomes too deep to support convection. Meanwhile at the surface dew
pts remain somewhat elevated in the mu50s to near 60. This yields
mucapes of 1000-1500 j kg. Although deepening mid level dry air will
likely preclude convection from developing. However still 2+ days
away so will have to monitor later trends. Otherwise models in good
agreement on a fairly nice day with the trend being morning showers
giving way to partial afternoon sunshine.

Thursday...

good model agreement that short wave trough exits east Wed night
with slightly cooler and drier air post frontal airmass for Thu with
dew pts falling from the 50s Wed to the 40s thu. Seasonably warm
with highs 70-75. Could be the pick of the week.

Friday...

waa pattern ahead of next short wave trough with a risk of showers
during the day and or at night. Obviously model timing differences
at this time range.

Weekend...

surprisingly both deterministic and ensemble guidance in good
agreement for the start of next weekend with mean mid level trough
axis over or east of the region. This would suggest dry weather to
start the weekend. However models differ on how quickly the
northeast trough reloads with upstream jet energy. Thus Sunday's
forecast becomes highly uncertain. Temperatures look to be near
normal next weekend... Highs in the 70s and lows in the 50s.

Aviation 14z 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 ...

715 am update...

ifr CIGS over eastern ma and ri will continue to move westward
into ct and western-central ma today. Rain overspreads the
region from the south and west today. Not much change from
previous tafs. Earlier discussion below.

===============================================================
today and tonight... Moderate confidence. MVFR to ifr conditions
overspread the region through the morning and into the early
afternoon in a period of rain. Easterly wind gusts around 20
knots are expected on the coast, with up to 25 knots across
portions of the CAPE islands.

The rain will taper off to light showers drizzle from west to
east late this afternoon early evening. However, MVFR-ifr
conditions may persist for much of Mon night with the lowest
conditions most likely on the coast.

MVFR on Tuesday with a few sites reachingVFR. Isolated shower
or two is possible, with a better chance for showers thunder
across western terminals by the evening.

Kbos taf... Moderate confidence in taf. Fog bank should lift as
patchy light rain develops this afternoon. Timing of improving
vsby not certain.

Kbdl taf... Moderate confidence in taf.

Outlook Tuesday night through Friday ... Moderate confidence.

GenerallyVFR. Potential for MVFR CIGS vsbys in afternoon evening
showers and scattered t-storms. Best chance for the latter will be
in western central mass and northern connecticut Tue night into wed
morning. Thursday looks to be mainly dry with another risk for
showers and isolated thunder Fri fri night.

South winds Tuesday night, becoming southwest Wednesday, west
Thursday, and southwest Friday. All winds should be 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 Tuesday ...

today... Moderate to high confidence. High pressure building
across the canadian maritimes coupled with a wave of low
pressure passing to our south will generate easterly wind gusts
around 25 knots for the waters. Thus will continue with sca.

Easterly fetch will also build seas between 3 and 6 feet across
our open waters. The strongest wind gusts seas will be across
our southern waters. Rain and patchy fog is also expected to
develop and an isolated t-storm or two can not be ruled out
across our southern waters.

Tonight... Moderate to high confidence. Winds and seas will
begin to diminish this evening and especially after midnight as
disturbance moves away from the region and pressure gradient
weakens. Areas of fog may persist into early Tue am reducing
vsbys for mariners.

Tuesday... High confidence. Improving conditions as weak high
pressure moves over the southern waters. Could see areas of fog
or drizzle but seas and winds will remain below sca.

Outlook Tuesday night through Friday ... Moderate confidence.

Tuesday night through Friday...

winds less than 25 kt most if not the entire forecast period. Vsby
may be restricted Tue night into Wed with scattered showers and
isolated thunder possible. Dry tranquil likely beginning wed
afternoon into Thu then another round of showers and isolated
thunder possible Fri fri night.

Tides coastal flooding
Latest observations continue to show a storm surge just over a
half foot along the eastern ma coast for this current high tide.

For tonight, another high astro tide of 11.5 feet occurs just
after 3 am in boston. While that is lower that previous nights,
the onshore component will remain with a storm surge of a half
foot or even a bit more. While no significant problems are
expected, very minor nuisance coastal flooding is possible along
the most vulnerable shore roads along the eastern ma coast. Will
hold off on coastal flood statement at this time.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory until 8 pm edt this evening for
anz231>235-237.

Small craft advisory until 2 am edt Tuesday for anz250.

Small craft advisory until 2 am edt Tuesday for anz254>256.

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



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 14 mi62 min 52°F2 ft
44020 - NANTUCKET SOUND 24 mi76 min 53°F2 ft1014.9 hPa (-0.7)
WAXM3 - Waquoit Bay Reserve, MA 27 mi81 min 2.9 51°F 50°F
NTKM3 - 8449130 - Nantucket Island, MA 34 mi48 min E 11 G 16 51°F 58°F1015.2 hPa
BZBM3 - 8447930 - Woods Hole, MA 36 mi48 min 51°F 58°F1014.7 hPa

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chatham, Chatham Municipal Airport, MA7 mi74 minE 97.00 miLight Rain50°F48°F96%1016.4 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA12 mi70 minVar 56.00 miLight Rain Fog/Mist51°F50°F96%1015.4 hPa
Provincetown, Provincetown Municipal Airport, MA18 mi70 minE 117.00 miLight Rain49°F46°F93%1017 hPa

Wind History from CQX (wind in knots)
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Last 24hrSE10
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S7S8SE75S43S4S3S454SE6SE6E10E9E9E9E7E8E10E11E9E10
1 day agoNE74NE6E6E6E4S3CalmSW3CalmCalmCalmCalmCalmS3CalmCalmCalm3SW44SE8SE8SE9
2 days agoNW10
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NW7NW63CalmNE3CalmCalmCalmN3CalmNW3CalmN433444NW7W56NE11

Tide / Current Tables for Sesuit Harbor, East Dennis, Cape Cod Bay, Massachusetts
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Sesuit Harbor
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Mon -- 02:23 AM EDT     12.24 feet High Tide
Mon -- 05:09 AM EDT     Sunrise
Mon -- 08:45 AM EDT     -1.33 feet Low Tide
Mon -- 09:15 AM EDT     Moonrise
Mon -- 03:07 PM EDT     10.82 feet High Tide
Mon -- 08:06 PM EDT     Sunset
Mon -- 09:03 PM EDT     -0.16 feet Low Tide
Mon -- 11:54 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.110.712.11210.47.84.71.6-0.7-1.3-02.24.97.79.910.810.38.56.13.30.9-0.20.62.7

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Mon -- 12:23 AM EDT     -0.00 knots Slack
Mon -- 03:08 AM EDT     -2.06 knots Max Ebb
Mon -- 05:09 AM EDT     Sunrise
Mon -- 06:18 AM EDT     0.00 knots Slack
Mon -- 09:15 AM EDT     Moonrise
Mon -- 09:44 AM EDT     2.34 knots Max Flood
Mon -- 01:07 PM EDT     -0.00 knots Slack
Mon -- 03:46 PM EDT     -1.90 knots Max Ebb
Mon -- 06:58 PM EDT     0.00 knots Slack
Mon -- 08:05 PM EDT     Sunset
Mon -- 10:12 PM EDT     1.91 knots Max Flood
Mon -- 11:52 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.5-0.7-1.7-2.1-1.9-1.3-0.30.71.72.22.321.30.1-1-1.7-1.9-1.6-0.9011.61.91.8

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Northeast    EDIT
Geos

Wind Forecast for Boston, MA (13,3,4,5)
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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.