Monday, December10, 2018 L-36.com


Marine Weather and Tides
Harwich Port, MA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:56AMSunset 4:12PM Monday December 10, 2018 7:11 PM EST (00:11 UTC) Moonrise 10:32AMMoonset 8:14PM Illumination 12% 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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ANZ232 Nantucket Sound- 436 Pm Est Mon Dec 10 2018
Tonight..N winds 10 to 15 kt, becoming ne 5 to 10 kt after midnight. Seas 2 to 3 ft.
Tue..NE winds around 5 kt, becoming se around 5 kt in the afternoon. Seas around 2 ft.
Tue night..NW winds around 5 kt, increasing to 5 to 10 kt after midnight. Seas around 2 ft.
Wed..N winds 10 to 15 kt with gusts up to 25 kt. Seas around 3 ft.
Wed night..N winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of snow showers in the evening.
Thu..NE winds 5 to 10 kt, becoming se in the afternoon. Seas around 2 ft.
Thu night..S winds 5 to 10 kt. Gusts up to 20 kt after midnight. Seas around 2 ft.
Fri..S winds 5 to 10 kt with gusts up to 20 kt. Seas around 2 ft.
Fri night..S winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to 3 ft. A chance of rain.
Sat..SE winds 10 to 15 kt with gusts up to 30 kt. Seas 3 to 4 ft. Rain likely.
Sat night..N winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Gusts up to 35 kt. Seas around 6 ft. A chance of rain. 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 436 Pm Est Mon Dec 10 2018
Synopsis for massachusetts and rhode island coastal waters.. High pres over new england this evening, will shift E tonight and Tue. Weak low pres will pass E across the waters Tue night while high pres builds S from quebec into Wed. This will result in ocean effect snow bands developing across the eastern massachusetts waters Tue night into Wed night. The high will crest over the waters Thu then shift E of the waters on Fri. A storm system will approach the waters from the sw Fri night and Sat, lifting slowly across the waters Sat night and 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 Harwich Port, MA
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location: 41.57, -70.05     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 102343
afdbox
area forecast discussion
national weather service boston norton ma
643 pm est Mon dec 10 2018

Synopsis
Mainly dry and cold weather prevails into Thursday, except for some
scattered ocean effect snow showers possible late Tuesday night into
Wednesday night mainly across the outer-cape. Milder
temperatures arrive Friday and continue into early next week
with the best chance for rain Friday night into Saturday in
association with low pressure.

Near term until 6 am Tuesday morning
640 pm update...

previous forecast on track with a ridge of high pressure in
control. Light winds mainly clear skies will result in an ideal
night of radiational cooling. Low temps by daybreak should be
well down into the teens in many locales with perhaps even a
few high single digit readings in the normally coldest outlying
locations.

The only exception to the mainly clear skies will be some ocean
effect clouds mainly impacting the CAPE ack at times
overnight... But can not rule out a few across CAPE ann plymouth
county. While they have temporarily dissipated... We may see
them reform as flow just off the deck turns a bit more easterly
albeit very light.

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

dry conditions prevail during the day, with high pressure over our
area. A clipper type system approaches our area from the west,
moving thru the great lakes region as the day progresses. This
allows the flow to shift from N nne to W SW over the course of the
day.

If some ocean stratocumulus redevelop, could have partly cloudy
skies over mid and outer CAPE nantucket to start. Then
increasing sunshine expected as the winds turn to the W sw.

Otherwise another sunny mostly sunny and cold day is forecast
for southern new england. Highs will range from the upper 20s to
mid 30s across the interior, to the 30s along the coastal
plain.

Tuesday night...

the surface low pressure and associated northern stream short
wave mid level trough push eastward thru our area during Tue night.

There is not much moisture with this feature as it moves thru our
area, expecting mainly some clouds. Slight chance of snow showers
during the overnight, mainly near across the CAPE and islands as
winds turn to the nnw, enabling an ocean effect component. Little or
no accumulation is expected.

Long term Wednesday through Monday
Highlights...

* mainly dry cold Wed into Thu but some ocean effect snow showers
possible mainly across the outer-cape Wed into Wed night
* milder weather arrives Friday into early next week, but some wet
weather possible at times W greatest risk Fri night into sat
details...

Wednesday and Wednesday night...

vigorous northern stream energy swings across the region early
Wednesday. This upper level energy will be associated with a distant
ocean storm... So will have to watch for an inverted trough. At this
point... Guidance indicates that the bulk of the moisture instability
and convergence remains offshore and is also rather progressive.

While these things are difficult to forecast even in the very short
term... Odds favor this being too progressive offshore for much
impact. Therefore... Most of the region probably remains dry except
for mainly portions of the cape, which will discuss in the next
paragraph. It will be rather cold with highs on Wed mainly in the
lower to middle 30s. Low temps Wed night should be well down into
teens in most locations... But some high single digit readings are
possible across the normally coldest outlying locations.

With that said... There may be enough convergence and moisture with
the inverted trough for a brief period of snow showers into part of
Wednesday morning across the CAPE and and perhaps even
nantucket plymouth county. Then later Wed into Wed night... Strong
cold air advection will allow 850t to drop to between
-13c and -15c across far eastern new england. This will result in
the sst differential around 20c and ocean induced capes near 400
j kg. This modest instability and favorable northerly wind
trajectories will probably bring a period of ocean effect snow
showers to the outer-cape Wed afternoon night. Depending on exact
wind direction may see this activity get briefly into plymouth
county and nantucket. Snow accumulations of a coating to 1 inch are
possible mainly across the outer-cape with perhaps very localized 2
inch amounts.

Thursday...

large high pressure will be centered over our region. Given the
very cold start limited mixing and low december Sun angle it will be
a rather cold day. Despite lots of sunshine... Many locations will
only see high temperatures in the lower to middle 30s.

Friday through Monday...

a significant pattern change will be occurring with an active
pacific jet taking control. The cold weather we have been dealing
with the last month will be flushed out with the active pacific jet.

Given the pattern in transition... The models are going to struggle
with northern and southern stream energy, timing and their
interactions. The long range guidance and ensembles show quite the
spread in solutions. We will say that the best chance for
precipitation looks to be Friday night into Saturday... But
additional chances will be possible into early next week. Ptype will
strongly favor rain given milder pacific air invading the region.

Aviation 00z Tuesday through Saturday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday night ... High confidence.

Tonight and Tuesday... MainlyVFR. Exception is possible sct-bkn
vfr MVFR CIGS tonight into Tuesday across the mid to outer
cape nantucket. Low risk for some of these clouds to briefly
impact CAPE ann plymouth county too. Light N nne winds tonight
becoming light S SW tue.

Tuesday night... VFR, except MVFR CIGS possible CAPE islands. Slight
chance -shsn, mainly CAPE islands.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Wednesday through Saturday ...

Wednesday:VFR. Breezy.

Wednesday night: breezy.

Thursday through Thursday night:
Friday: breezy.

Friday night: windy with local gusts to 30 kt. Chance ra.

Saturday: windy with gusts to 35 kt. Chance ra.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday night ... High confidence.

Tonight...

winds slowly diminish but remain n-ne. Gusts up to 20 kt possible
across the outer waters this evening. Seas around 2 to 4 feet away
from the coast.

Tuesday... High pressure moves across the waters as another weak low
approaches from the w. Light NE winds become variable to sw. Seas
continue at 4 ft or less.

Tuesday night... Weak low pressure moves across the waters. Light
west winds becoming NW and increasing to 10 to 15 kts, gusts to 20
kts possible towards daybreak. Slight chance of snow showers.

Outlook Wednesday through Saturday ...

Wednesday: moderate risk for small craft advisory winds with
gusts up to 25 kt. Local rough seas. Chance of snow showers.

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

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

Thursday night: winds less than 25 kt.

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

Friday night: moderate risk for small craft advisory winds with
gusts up to 30 kt. Chance of rain.

Saturday: low risk for gale force winds with gusts up to 40 kt.

Local rough seas. Chance of rain.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Nmb frank
near term... Frank
short term... Nmb
long term... Frank
aviation... Nmb frank
marine... Nmb frank


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 13 mi32 min N 9.7 G 12 35°F 41°F21°F
NTKM3 - 8449130 - Nantucket Island, MA 20 mi42 min N 7 G 11 35°F 37°F1019.8 hPa
44090 24 mi42 min 44°F2 ft
WAXM3 - Waquoit Bay Reserve, MA 25 mi147 min Calm 33°F 1020 hPa22°F
BZBM3 - 8447930 - Woods Hole, MA 33 mi42 min 32°F 41°F1019.9 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 44 mi82 min NNW 14 G 18 35°F 3 ft1019.7 hPa (+1.1)17°F

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chatham, Chatham Municipal Airport, MA10 mi20 minN 010.00 miFair28°F19°F72%1020.4 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA14 mi16 minN 010.00 miFair28°F19°F69%1019.8 hPa
Nantucket, Nantucket Memorial Airport, MA21 mi19 minN 710.00 miFair32°F21°F64%1020 hPa

Wind History from CQX (wind in knots)
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Last 24hr------------------------------------------------
1 day ago------------------------------------------------
2 days ago------------------------------------------------

Tide / Current Tables for Monomoy Point, Cape Cod, Massachusetts
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Monomoy Point
Click for Map
Mon -- 01:36 AM EST     3.61 feet High Tide
Mon -- 06:55 AM EST     Sunrise
Mon -- 07:21 AM EST     0.39 feet Low Tide
Mon -- 09:32 AM EST     Moonrise
Mon -- 01:39 PM EST     4.01 feet High Tide
Mon -- 04:09 PM EST     Sunset
Mon -- 07:14 PM EST     Moonset
Mon -- 07:55 PM EST     0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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33.53.63.22.51.70.90.40.511.82.63.43.943.62.9210.300.30.91.6

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
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Mon -- 01:58 AM EST     -1.64 knots Max Ebb
Mon -- 05:04 AM EST     0.00 knots Slack
Mon -- 06:55 AM EST     Sunrise
Mon -- 08:26 AM EST     1.77 knots Max Flood
Mon -- 09:31 AM EST     Moonrise
Mon -- 11:20 AM EST     -0.00 knots Slack
Mon -- 02:04 PM EST     -1.73 knots Max Ebb
Mon -- 04:09 PM EST     Sunset
Mon -- 05:13 PM EST     0.00 knots Slack
Mon -- 07:14 PM EST     Moonset
Mon -- 08:48 PM EST     2.10 knots Max Flood
Mon -- 11:58 PM EST     -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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-0.8-1.4-1.6-1.5-0.9-0.10.81.41.71.71.30.4-0.7-1.5-1.7-1.6-1-0.20.71.522.11.81

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 (19,4,5,8)
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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.