Tuesday, June19, 2018 L-36.com


Marine Weather and Tides
West Yarmouth, MA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:04AMSunset 8:20PM Tuesday June 19, 2018 10:08 PM EDT (02:08 UTC) Moonrise 11:45AMMoonset 12:23AM Illumination 41% Phase: Waxing Crescent; Moon at 7 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- 716 Pm Edt Tue Jun 19 2018
Tonight..N winds around 5 kt, becoming nw around 5 kt after midnight. Seas around 2 ft.
Wed..W winds around 5 kt, becoming sw with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft.
Wed night..SW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Patchy fog. Showers likely. Vsby 1 to 3 nm.
Thu..S winds 5 to 10 kt, becoming E in the afternoon. Seas 1 foot or less. Patchy fog. Vsby 1 to 3 nm.
Thu night..NE winds 5 to 10 kt. Seas 1 foot or less.
Fri..NE winds 5 to 10 kt, becoming se in the afternoon. Seas 1 foot or less.
Fri night..SE winds 5 to 10 kt. Seas around 2 ft.
Sat..SE winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Sat night..S winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers.
Sun..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers.
Sun night..W winds 10 to 15 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 716 Pm Edt Tue Jun 19 2018
Synopsis for massachusetts and rhode island coastal waters.. High pressure builds across the waters into this evening, shifting east on Wednesday. An area of low pressure follows for Wednesday night skirting south coastal new england with rain and possibly lower visibility. Seasonable and dry weather follows with return high pressure the remainder of the week, while a warm front lifts north across the waters over the weekend. 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 Yarmouth, MA
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location: 41.6, -70.27     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 192353
afdbox
area forecast discussion
national weather service boston norton ma
753 pm edt Tue jun 19 2018

Synopsis
Dry weather is expected tonight and Wednesday as high pressure
builds over new england. Showers are likely Wednesday night,
especially south of the mass pike, as low pressure passes
offshore. High pressure from canada brings dry weather
Thursday and Friday. A cold front them brings a chance of
showers over the weekend, followed by dry weather early next
week.

Near term until 6 am Wednesday morning
7 pm update...

a few mid level clouds have moved into western and central mass
but will likely dissipate after sunset. Skies will remain mostly
clear overnight. Cloud cover will increase from the southwest
just before sunrise tomorrow morning as a low pressure system
approaches.

Lowered min temps for tonight given that we should stay mostly
clear overnight and sites will have the chance to radiate across
the region. Temps in the upper 40s are possible tonight,
especially in upper connecticut river valley along the 495
corridor.

Otherwise, previous forecast remains on track.

Previous discussion...

any lingering diurnal clouds will dissipate toward sunset,
giving way to clear skies and diminishing winds tonight. This
will allow for good radiational cooling away from coast. Sided
closer to cooler MOS guidance which gives lows in upper 40s to
mid 50s. Airmass remains dry enough to preclude mention of
patchy fog.

Short term 6 am Wednesday morning through Wednesday night
High pressure over sne heads offshore in afternoon, resulting in
s SW flow across region. Airmass remains dry as seen in model cross
sections so just expect some diurnal clouds to form, but overall
plenty of sunshine. Highs should run a few degrees cooler than
today, ranging from mid 70s on south coast, cape, and islands to the
mid 80s inland.

Models in good agreement on arrival of showers Wednesday night as
short wave passes and weak surface low pass south of new england.

Main issue is how far north do the showers extend into sne. Right
now we are most confident for ct, ri, and SE ma which come under
influence of best theta-e advection and lower level convergence
moisture transport. Blended in high-res arw WRF which gives as much
as 0.50 to 0.75" of rain. Farther north, it will be a battle with
dry air pushing down from northern new england, so it's possible
areas along and north of mass pike remain dry.

Long term Thursday through Tuesday
Highlights...

* lingering showers, south coast on Thursday
* dry and seasonable on Friday
* unsettled weather for the weekend
overview...

12z models show good agreement with the flow pattern evolution
during the long term increasing forecaster confidence. Northern
stream flow will feature a persistent upper ridge over central
canada with a couple of frontal waves moving across the central u.S.

New england will remain on the edge of an upper level trough over
the maritimes keeping the region in northwest flow. Passing wave
from the midwest will impact southern new england over the weekend
before northwest flow returns for next week. As an fyi, the canadian
model indicates the formation of a nor'easter early next week but
this is not supported by its own ensemble mean nor the GFS and ecmwf
solutions.

Details...

a few lingering showers on Thursday morning thanks to passing wave
to the south. Conditions will improve in the afternoon with
seasonable temperatures. High pressure on Friday will lead to dry
weather and temperatures near normal. Sea breeze potential possible.

Unsettled weather returns for the weekend as a low pressure from the
great lakes passing through northern new england. Associated warm
and cold front will sweep through resulting in a warm frontal
showers on Saturday followed by showers and thunderstorms on Sunday
with approaching cold front from the west. Still some timing issues
but appears precip will impact this upcoming weekend, luckily not a
washout.

Canadian high pressure will move in behind the front on Monday
lasting into the work week resulting in dry weather.

Aviation 00z Wednesday through Sunday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Wednesday night ... High confidence.

Vfr. N NW winds gust to 20-25 kt through late afternoon before
diminishing and becoming light variable tonight. SW winds
prevail Wednesday and Wednesday night. Showers likely across ct,
ri, and SE ma Wednesday night with areas of MVFR or perhaps ifr
ceilings.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Thursday through Sunday ... Moderate confidence.

Thursday through Friday night:VFR.

Saturday: mainlyVFR, with local MVFR possible. Chance shra.

Saturday night: mainlyVFR, with areas ifr possible. Chance
shra, isolated tsra.

Sunday: mainlyVFR, with local MVFR possible. Chance shra,
isolated tsra.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Wednesday night ...

high confidence.

Diminishing N NE winds and seas tonight as high pressure builds over
sne. SW flow develops Wednesday and Wednesday night as the high
becomes centered offshore. Winds and seas remain below 25 kt and 5
ft respectively, but recreational boaters should be aware of 15-20
kt gusts and locally choppy seas of 2 or 3 ft on narragansett bay
and south coastal sounds Wednesday afternoon.

Reduced visibility in showers and patchy fog Wednesday night,
especially on south coastal waters.

Outlook Thursday through Sunday ... Moderate confidence.

Thursday: winds less than 25 kt. Slight chance of rain showers,
patchy fog.

Thursday night through Friday night: winds less than 25 kt.

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

Chance of rain showers.

Saturday night: winds less than 25 kt. Local rough seas. Chance
of rain showers, isolated thunderstorms.

Sunday: winds less than 25 kt. Areas of rough seas. Chance of
rain showers, isolated thunderstorms.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Dunten jwd
near term... Correia jwd
short term... Jwd
long term... Dunten
aviation... Dunten correia jwd
marine... Belk dunten jwd


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 7 mi38 min WSW 3.9 G 5.8 67°F 65°F1010.3 hPa62°F
WAXM3 - Waquoit Bay Reserve, MA 14 mi83 min Calm 70°F 1010 hPa65°F
44090 17 mi38 min 63°F1 ft
BZBM3 - 8447930 - Woods Hole, MA 22 mi50 min 67°F 65°F1010.4 hPa
NTKM3 - 8449130 - Nantucket Island, MA 24 mi50 min WSW 5.1 G 6 64°F 69°F1010.5 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 42 mi78 min SSE 1.9 G 1.9 64°F 2 ft1009.9 hPa (+1.9)53°F
BUZM3 - Buzzards Bay, MA 43 mi68 min SSW 7 G 7 70°F 1010.3 hPa (+1.5)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 48 mi50 min NE 4.1 G 5.1 74°F 1010.1 hPa
FRVM3 - 8447386 - Fall River, MA 48 mi50 min 74°F 70°F1010.7 hPa
FRXM3 49 mi50 min 72°F 53°F

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA6 mi72 minN 010.00 miFair64°F55°F75%1009.7 hPa
Otis Air National Guard Base, MA14 mi73 minN 310.00 miFair66°F53°F64%1010.5 hPa
Chatham, Chatham Municipal Airport, MA16 mi76 minN 310.00 miFair65°F51°F61%1009.9 hPa
Marthas Vineyard Airport, MA23 mi75 minN 010.00 miFair64°F60°F87%1009.7 hPa

Wind History from HYA (wind in knots)
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N9NE7N7N6CalmCalm
1 day agoS6S6SW7SW8SW9SW9SW10SW12SW16
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2 days agoSW4W5SW5CalmCalmCalmCalmCalmCalmN4N7N5N7NE4S5SE65S8S9S9S7S5SW6S6

Tide / Current Tables for Hyannis Port, Nantucket Sound, Massachusetts
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Hyannis Port
Click for Map
Tue -- 12:23 AM EDT     Moonset
Tue -- 05:06 AM EDT     Sunrise
Tue -- 05:17 AM EDT     3.58 feet High Tide
Tue -- 11:13 AM EDT     -0.38 feet Low Tide
Tue -- 11:44 AM EDT     Moonrise
Tue -- 06:01 PM EDT     3.36 feet High Tide
Tue -- 08:18 PM EDT     Sunset
Tue -- 11:37 PM EDT     -0.00 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.41.11.82.63.23.63.52.9210.1-0.4-0.20.311.72.53.13.43.12.51.60.70.1

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Tue -- 12:22 AM EDT     Moonset
Tue -- 02:20 AM EDT     -0.00 knots Slack
Tue -- 05:03 AM EDT     -1.84 knots Max Ebb
Tue -- 05:05 AM EDT     Sunrise
Tue -- 08:14 AM EDT     0.00 knots Slack
Tue -- 11:43 AM EDT     Moonrise
Tue -- 11:46 AM EDT     2.17 knots Max Flood
Tue -- 03:04 PM EDT     -0.00 knots Slack
Tue -- 05:46 PM EDT     -1.75 knots Max Ebb
Tue -- 08:16 PM EDT     Sunset
Tue -- 08:59 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.30.4-0.7-1.5-1.8-1.6-1.1-0.20.81.62.12.21.91.20.1-1-1.6-1.7-1.5-0.900.91.5

Weather Map and Satellite Images
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wmap_A
GOES Local Image of Northeast    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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (22,6,7,8)
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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.