Wednesday, September19, 2018 L-36.com


Marine Weather and Tides
North Eastham, MA

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9/17/2018 XTide broke when 1and1 "upgraded" my server. It has been esculated. I am sorry for the problem.

Sunrise 6:24AMSunset 6:44PM Wednesday September 19, 2018 12:39 PM EDT (16:39 UTC) Moonrise 4:03PMMoonset 12:57AM Illumination 72% Phase: Waxing Gibbous; Moon at 10 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- 716 Am Edt Wed Sep 19 2018
Today..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Patchy fog this morning. A chance of drizzle this morning with vsby 1 nm or less.
Tonight..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Thu..NE winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas 2 to 4 ft.
Thu night..E winds 5 to 10 kt. Seas 2 to 3 ft.
Fri..S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft.
Fri night..SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft.
Sat..NW winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to 4 ft. A chance of showers. Vsby 1 to 3 nm.
Sat night..NE winds 5 to 10 kt. Seas around 2 ft.
Sun..E winds around 5 kt. Seas 1 foot or less.
Sun night..E winds 5 to 10 kt. Seas around 2 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 716 Am Edt Wed Sep 19 2018
Synopsis for massachusetts and rhode island coastal waters.. High pressure over the maritimes will bring persistent ne winds through Thu. A warm front will push N of the waters Thu night, with s-sw winds possibly approaching gale force Fri and Fri night. A cold front will push across the waters early Sat. High pres builds to the north on Sun. 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 North Eastham, MA
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location: 41.92, -70.03     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 191429
afdbox
area forecast discussion
national weather service boston norton ma
1029 am edt Wed sep 19 2018

Synopsis
Northeast winds bring low clouds and spotty light drizzle today
which slowly gives way to breaks of afternoon sunshine from
west to east. High pressure builds into new england tonight and
Thursday yielding dry cool weather. Warmer Friday ahead of an
approaching cold front then turning cooler over the weekend as
high pressure builds into the area from the great lakes.

Near term until 6 pm this evening
1030 am update...

moist NE flow continues to advect low clouds and spotty light
drizzle across eastern ma into ri and the worcester hills
southward into eastern ct. Meanwhile the ct river mainly
maintaining partly to mostly sunny conditions as low clouds
struggling to advect up and over the hilly terrain and following
a path more into the coastal plain. Thus big temp differences
from bdl (73f) to 63f at bos. As previous forecaster noted 925
mb temps cool today across eastern ma as temps begin the day at
+15c but +11c advects southward down the coastal plain from me
this afternoon. So temps may fall or remain in the lower 60s
across eastern ma this afternoon. Quite the change from recent
weeks.

However for the remainder of the area low level moisture will be
difficult to dislodge or modify given persistent NE flow and
lower Sun angle now that we're in mid late sep. However as ne
winds ease this afternoon low clouds stratus will lift into the
strato-cu deck with breaks of sunshine possible from west to
east late in the day. However overcast conditions likely linger
over CAPE cod and nantucket.

Previous forecast captures these details nicely so no major
changes with this forecast update.

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

high pres builds to the north with ridging extending south into
new eng. However, low level NE flow persists and enough moisture
in the lower levels for patchy fog and stratus developing
again. Lows will range through the 50s.

Thursday...

heights rise across new eng along the periphery of building
ridge across SE conus, while high pres at the surface builds
over new eng. Expect light winds and more sunshine thu. Due to
cooler start to the day and cool 925 mb temps, highs will be
mainly in the mid upper 60s, but around 70 in the lower ct
valley.

Long term Thursday night through Tuesday
Highlights...

* a warm front will bring a few showers across north central
and western areas Thu night into early fri
* a cold front approaches late fri, bringing scattered showers
and isolated thunderstorms especially across the interior
* large high pressure builds in from central and eastern canada
Saturday afternoon into Monday, bringing cool, dry conditions
overview...

00z model suite continues to signal a fast mid level steering
flow across the northeast u.S. Through the remainder of the work
week, as h5 cutoff low sits across northern hudson bay while a
broad h5 ridge remains just S of the region.

Models continue to signal a warm front approaching late thu
night into fri, but appears that most of the precip will remain
n and W of the region. Can't rule out a few showers across n
central through western mass mainly around or after midnight thu
night, but will retreat further inland by Fri morning. Winds
will shift to s-sw as the warm front lifts N during fri, and
there may be some gusty winds Fri afternoon evening across the
higher inland terrain as well as along the coast.

Expect a cold front to sweep across the region late Fri fri
night, bringing scattered showers. May also see a few
thunderstorms Fri night as the front passes, but the front moves
through rather quickly. Some showers may linger into Saturday
morning, but should move offshore by midday. May see some brief
heavy downpours as band of pwats up to 2 inches will move
across.

Once the front moves offshore, large high pressure builds
across the northeast through the remainder of the weekend into
Monday. With the center of the high N of the region, will see
persistently cool onshore winds in place. Expect the coolest
temps on Monday, with highs running up to 5 degrees below
seasonal normals.

Some question on the timing of the next system in the fast flow
aloft, possibly moving into western areas as early as Monday
night as h5 trough begins to dig across the northern plains.

Have carried chance pops for Mon night-tue for now, but low
confidence forecast.

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

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday ...

1430z update...

no change from previous forecast. Low clouds lifr-ifr will
gradually lift to MVFR this afternoon withVFR western ct ma.

Spotty light drizzle across eastern ma will come to an end this
afternoon. Modest NE winds persist with highest winds across
cape cod and nantucket with g25 kt at times possible. Earlier
discussion below.

==============================================================
today... Moderate confidence.

Vsbys improve during the morning as fog lifts. Ifr lifr cigs
with patchy drizzle slowly improving to MVFR this afternoon
across central and eastern ma and ri. MainlyVFR ct valley, but
MVFR CIGS possible for a few hours after 12z. NE gusts
increasing to 25 kt outer CAPE islands.

Tonight... Moderate confidence.

Areas of MVFR ifr CIGS likely redeveloping across the region.

Patchy fog.

Thursday... Moderate confidence.

Improving toVFR, but areas of MVFR CIGS persisting over
cape islands.

Kbos terminal... High confidence in ifr stratus with some fog.

Cigs slowly improving to MVFR this afternoon.

Kbdl terminal... Moderate confidence. MainlyVFR, but MVFR cigs
possible for a few hours after 12z.

Outlook Thursday night through Sunday ...

Thursday night:VFR. Slight chance shra.

Friday: mainlyVFR, with local MVFR possible. Breezy. Slight
chance shra.

Friday night: mainlyVFR, with areas MVFR possible. Windy with
gusts to 30 kt. Chance shra, isolated tsra.

Saturday:VFR. Breezy. Slight chance shra.

Saturday night through Sunday:VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday ...

1030 am update...

not much change. Strongest NE winds up to 25 kt across the
waters south and east of CAPE cod and nantucket. This long fetch
will build seas 4 to 7 ft. Vsby 1-3 miles at times in spotty
drizzle and fog but improving this afternoon. Earlier discussion
below.

================================================================
through tonight... High confidence.

Increasing NE winds today with gusts to 25 kt developing,
especially southern and SE waters. Wind gusts slowly diminish
later tonight. Seas building to 5-6 ft.

Thursday... High confidence.

Ne winds gradually diminish through the day as high pres builds
over the waters from the north. Seas up to 5 ft lingering over
the eastern waters.

Outlook Thursday night through Sunday ...

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

Friday: low risk for small craft advisory winds with areas of
gusts up to 30 kt. Seas up to 5 ft.

Friday night: moderate risk for small craft advisory winds with
gusts up to 30 kt. Local rough seas. Slight chance of rain
showers, isolated thunderstorms.

Saturday: low risk for small craft advisory winds with gusts up
to 25 kt. Local rough seas. Slight chance of rain showers.

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

Sunday: winds less than 25 kt.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory until 2 am edt Thursday for anz232>235.

Small craft advisory until 8 pm edt Thursday for anz250-254.

Small craft advisory until 8 am edt Thursday for anz251.

Small craft advisory until 8 am edt Thursday for anz255-256.

Synopsis... Kjc evt
near term... Kjc nocera
short term... Kjc
long term... Evt
aviation... Kjc nocera evt
marine... Kjc nocera evt


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 17 mi39 min 67°F4 ft
44018 - SE Cape Cod 30NM East of Nantucket, MA 21 mi49 min NE 19 G 21 62°F 5 ft1013.6 hPa (+2.2)59°F
44020 - NANTUCKET SOUND 32 mi29 min NE 18 G 19 67°F 72°F1012.7 hPa63°F
WAXM3 - Waquoit Bay Reserve, MA 35 mi54 min 2.9 65°F 1013 hPa65°F
NTKM3 - 8449130 - Nantucket Island, MA 44 mi39 min NE 14 G 17 67°F 72°F1012.4 hPa (+1.7)
44013 - BOSTON 16 NM East of Boston, MA 44 mi49 min NE 18 G 19 61°F 66°F4 ft1013.7 hPa (+2.3)61°F
BZBM3 - 8447930 - Woods Hole, MA 44 mi39 min 67°F 72°F1012.7 hPa (+1.8)

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Provincetown Municipal Airport, MA11 mi43 minNE 1610.00 miOvercast64°F60°F87%1014.1 hPa
Chatham, Chatham Municipal Airport, MA15 mi47 minNE 9 G 1510.00 miOvercast65°F62°F90%1013.4 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA21 mi43 minNNE 11 G 232.00 miLight Rain Fog/Mist66°F64°F93%1012.7 hPa

Wind History from PVC (wind in knots)
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Last 24hrSW18SW18W3E3W4N5N6CalmNW4NW3CalmCalmE3E5CalmCalmE4NE6NE5NE10NE18
G22
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1 day agoSW9S11S9SW12SW14SW12SW11SW10SW11S9S9S9S8S7SW6SW6S5S3S4S8S12
G16
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2 days agoSW7SW9SW7S6S5S6S7S7S7S7S6S7SW8SW7S6SW7SW8S6S7SW9SW8SW8SW10SW9

Tide / Current Tables for Wellfleet, Massachusetts
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Tide / Current data from XTide NOT FOR NAVIGATION
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Tide / Current Tables for Cape Cod Lighthouse, SE of, Cape Cod, Massachusetts
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Tide / Current data from XTide NOT FOR NAVIGATION
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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 (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.