Thursday, October19, 2017 L-36.com


Marine Weather and Tides
Yarmouth Port, 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 6:57AMSunset 5:54PM Thursday October 19, 2017 5:39 PM EDT (21:39 UTC) Moonrise 6:33AMMoonset 6:14PM 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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ANZ231 Cape Cod Bay- 344 Pm Edt Thu Oct 19 2017
.small craft advisory in effect until 2 am edt Friday...
Tonight..SW winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to 4 ft.
Fri..W winds 10 to 15 kt, becoming nw 5 to 10 kt in the afternoon. Gusts up to 25 kt. Seas around 2 ft.
Fri night..NW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas around 2 ft.
Sat..W winds around 5 kt, becoming sw in the afternoon. Seas 1 foot or less.
Sat night..SW winds 5 to 10 kt. Seas 1 foot or less.
Sun..SW winds 5 to 10 kt. Seas 1 foot or less.
Sun night..SW winds 5 to 10 kt. Seas 1 foot or less.
Mon..SW winds 5 to 10 kt. Seas 2 to 3 ft.
Mon night..S winds 5 to 10 kt. Seas around 2 ft.
Tue..S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft.
Tue night..S winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 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 344 Pm Edt Thu Oct 19 2017
Synopsis for massachusetts and rhode island coastal waters.. A dry cold front will move across the waters late tonight. Strong high pressure over the appalachians Friday will move east across the southern new england coastal waters this weekend. A cold front approaches from the west late Tuesday. 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 Yarmouth Port, MA
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location: 41.71, -70.29     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 191936
afdbox
area forecast discussion
national weather service taunton ma
336 pm edt Thu oct 19 2017

Synopsis
High pressure will maintain dry weather and warmer than normal
temperatures through the weekend. The risk of showers will
increase by the middle of next week.

Near term until 6 am Friday morning
High pressure is in general control of our weather, bringing dry
weather tonight. With light pressure gradient and sunset, expect
the southwest winds to diminish early tonight.

A shortwave will race across the northeast tonight and pull a
weak cold front through southern new england middle to late
night. As noted, not much moisture about and thus not expecting
much in the way of clouds. What may be noticed is a wind
direction shift where there are winds, with northwest winds
toward morning.

Many protected spots that will have light wind. The resulting
radiational cooling will again allow patches of fog to form.

Dew points will lower a few more degrees, general range upper
30s and 40s... Which is about normal. Expect min temps in the 40s
and low 50s.

Short term 6 am Friday morning through Friday night
High pressure remains in control with dry weather and mainly clear
skies. Main difference from today will be that winds will be
from the northwest and bringing slightly lower dew points.

Mixing during the day will reach 925 mb or a little higher,
similar to today, with temps at that level supporting MAX sfc
temps of roughly 65-70f.

At night, light wind with dew points 35-45 will allow
radiational cooling to bring min sfc temps in the upper 30s and
40s.

Long term Saturday through Thursday
Highlights...

* warm and dry this weekend lasting into Monday
* unsettled weather pattern with showers at times Tue into thu
overview...

strong subtropical ridge along the east coast will maintain warm and
dry conditions into early next week. Then models signal a pattern
change with significant amplification of the large scale flow as
northern stream trough digs south from the great lakes to the SE usa
and interacts with southern stream energy with an eventual high
amplitude trough setting up across the eastern seaboard. With
downstream ridging shifting over the atlantic, there could be a
period of unsettled weather sometime in the Tue to Thu timeframe but
timing and details remain uncertain in this developing complex
pattern.

Saturday through Monday...

high pres in control with building mid level ridge will result
sunshine and unseasonably warm weather. With 925 mb temps 17-18c
should see highs reach well into the 70s this weekend but somewhat
cooler along the south coast with SW flow. Warm and dry conditions
last into mon.

Tuesday through Thursday...

unsettled with showers at times as amplifying trough sets up to the
west with slow moving frontal boundary approaching and multiple
shortwaves moving through the flow. Timing and details of rainfall
remain uncertain but it appears there will be one period of rainfall
sometime Tue into Tue night with lead southern stream shortwave
lifting to the ne. Then possibly a break followed by another period
of rain Thu and beyond as frontal boundary stalls with another
system approaching. Very complex pattern so further forecast changes
expected. Temps above normal through wed, but lower confidence thu.

Aviation 20z Thursday through Tuesday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Friday night ... Generally high confidence.

Tonight...

a weak cold front crosses the region tonight, but with very
limited moisture, so few clouds if any. The main effect will be
a shift of diminishing winds with winds coming from the
northwest overnight.

Radiational cooling will allow patches of fog to develop later
tonight, especially in parts of the ct river valley and in the
usual fog magnets. Vsbys could drop to 1 2 mile in spots after
midnight.

Friday and Friday night...

vfr conditions continue. Areas of fog will dissipate first thing
Friday. Northwest winds will pick up a little, with late morning
and afternoon gusts near 20 knots. Winds then diminish with
sunset.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Saturday through Tuesday ...

through Monday... High confidence.VFR, but patchy late night fog
possible in the typical locations.

Tuesday... Moderate confidence. MVFR possible in developing
showers.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Friday night ... High confidence.

Tonight... Southwest winds gust 20 to 25 knots late afternoon but
diminish this evening. Seas on the outer waters will hover
around 5 feet, and while the flow is from the southwest these 5
foot seas may work into ri sound as well. Winds will shift from
the northwest later tonight, at which point the seas will
diminish.

A small craft advisory will remain in effect for the most of the
waters through this evening, and on the outer waters overnight.

Friday... Northwest winds will gust around 20 knots during the
day. Seas will remain 4 feet or less through the day.

Friday night... Winds remain 15 knots or less, and seas remain at
3 feet or less.

Outlook Saturday through Tuesday ... High confidence.

Great boating weather through Mon with SW winds below 20 kt and seas
below SCA thresholds as high pressure prevails. Increasing southerly
winds Tue as low level jet develops. High prob of SCA winds with low
risk for gales. Increasing threat of showers with reduced vsbys
tue.

Fire weather
Ahead of a very weak cold front, southwest winds will gust
20-25 mph across much of the region through this evening and
then diminish. With an overall recent lack of precipitation,
there could be an elevated fire weather potential through the
evening. A special weather statement continues to highlight this
risk.

Winds shift from the northwest overnight. On Friday these
northwest winds will gust around 20 mph, with minimum rh values
reaching 30-35 percent across much of the region. Thus there
could again be some risk of elevated fire weather potential. A
new special weather statement will highlight this potential.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory until 2 am edt Friday for anz231>234-250-
251-254.

Small craft advisory until midnight edt tonight for anz230-236.

Small craft advisory until 7 am edt Friday for anz235-237-255-
256.

Synopsis... Wtb kjc
near term... Wtb
short term... Wtb
long term... Kjc
aviation... Wtb kjc
marine... Wtb kjc
fire weather...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 9 mi40 min 59°F2 ft
WAXM3 - Waquoit Bay Reserve, MA 15 mi115 min 4.1 67°F 1020 hPa60°F
44020 - NANTUCKET SOUND 20 mi50 min SW 18 G 19 62°F 61°F2 ft1019.6 hPa (-2.1)62°F
BZBM3 - 8447930 - Woods Hole, MA 24 mi52 min 63°F 64°F1019.6 hPa
NTKM3 - 8449130 - Nantucket Island, MA 31 mi52 min SW 7 G 12 63°F 62°F1020.5 hPa
BUZM3 - Buzzards Bay, MA 45 mi40 min SW 21 G 24 62°F 1019.5 hPa (-1.9)
FRVM3 - 8447386 - Fall River, MA 46 mi52 min 66°F 64°F1019.3 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 47 mi52 min SSW 16 G 20 65°F 1017.5 hPa
FRXM3 47 mi52 min 65°F 55°F
44013 - BOSTON 16 NM East of Boston, MA 48 mi50 min S 18 G 19 65°F 59°F2 ft1016.3 hPa (-2.6)

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
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N11
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NW1

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA2 mi44 minSW 16 G 2310.00 miFair64°F55°F75%1019 hPa
Otis Air National Guard Base, MA13 mi45 minSW 1710.00 miA Few Clouds63°F55°F77%1019.6 hPa
Chatham, Chatham Municipal Airport, MA16 mi48 minSW 11 G 2010.00 miFair63°F59°F87%1020 hPa
Provincetown Municipal Airport, MA21 mi44 minSSW 17 G 2210.00 miFair63°F55°F76%1018.4 hPa

Wind History from HYA (wind in knots)
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Last 24hrSW7SW4SW3SW4CalmCalmCalmCalmCalmCalmCalmCalmSW5CalmS7SW8SW13
G18
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1 day agoS3CalmSW5CalmSW3CalmSW8SW7W3CalmSW8SW9SW9SW7W8W8SW9W7SW6SW56NE6SW8SW6
2 days agoN10N10N9
G18
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G24
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N7N7NE4SE3

Tide / Current Tables for Barnstable Harbor, Beach Point, Massachusetts
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Barnstable Harbor
Click for Map
Thu -- 05:51 AM EDT     -0.10 feet Low Tide
Thu -- 06:33 AM EDT     Moonrise
Thu -- 06:58 AM EDT     Sunrise
Thu -- 11:47 AM EDT     10.74 feet High Tide
Thu -- 03:12 PM EDT     New Moon
Thu -- 05:53 PM EDT     Sunset
Thu -- 06:14 PM EDT     Moonset
Thu -- 06:16 PM EDT     -0.37 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.39.37.452.40.4-0.10.92.85.68.410.310.79.98.363.20.9-0.301.64.179.3

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
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Cape Cod Canal
Click for Map
Thu -- 12:24 AM EDT     -4.73 knots Max Ebb
Thu -- 03:38 AM EDT     0.21 knots Slack
Thu -- 06:34 AM EDT     Moonrise
Thu -- 06:51 AM EDT     4.54 knots Max Flood
Thu -- 06:59 AM EDT     Sunrise
Thu -- 10:00 AM EDT     -0.16 knots Slack
Thu -- 12:47 PM EDT     -4.70 knots Max Ebb
Thu -- 03:12 PM EDT     New Moon
Thu -- 04:00 PM EDT     0.21 knots Slack
Thu -- 05:54 PM EDT     Sunset
Thu -- 06:15 PM EDT     Moonset
Thu -- 07:10 PM EDT     4.50 knots Max Flood
Thu -- 10:19 PM EDT     -0.16 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-4.7-4.6-4-2.623.64.44.54.23.3-0.1-3.4-4.5-4.7-4.3-3.2-0.13.24.24.54.33.72-2.8

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 (17,4,5,8)
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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.