Wednesday, May23, 2018 L-36.com


Marine Weather and Tides
Yarmouth Port, 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 5:12AMSunset 8:03PM Wednesday May 23, 2018 11:10 AM EDT (15:10 UTC) Moonrise 1:54PMMoonset 2:21AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 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- 1029 Am Edt Wed May 23 2018
This afternoon..SW winds 5 to 10 kt. Seas around 2 ft.
Tonight..W winds 5 to 10 kt, becoming ne after midnight. Seas around 2 ft.
Thu..NE winds around 5 kt, becoming se in the afternoon. Seas around 2 ft.
Thu night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft.
Fri..SW winds 10 to 15 kt with gusts up to 25 kt. Seas around 2 ft.
Fri night..SW winds 10 to 15 kt with gusts up to 25 kt. Seas around 2 ft.
Sat..SW winds 5 to 10 kt with gusts up to 20 kt. Seas around 2 ft.
Sat night..SE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Sun..E winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers.
Sun night..E winds 5 to 10 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 1029 Am Edt Wed May 23 2018
Synopsis for massachusetts and rhode island coastal waters.. Behind a departing low pressure area, winds will start out light southwesterly, then sea breezes develop this afternoon. A cold front will drop south across the waters tonight with a wind shift out of the ne then se as high pressure builds in behind it on Thu. The high will shift southeast of the waters Fri and Sat resulting in sw winds. A back door cold front drops southwest across the waters late day Sat with a wind shift out of the e/ne as high pressure builds over the canadian maritimes through Mon. Low clouds and fog, along with the chance of showers, perhaps even a Thunderstorm lingers this morning prior to a series of sweeping cold fronts later today. Thereafter, high pressure and light winds for late week, over the waters Thursday, southeast of the waters Friday. Warming ahead of a holiday weekend cold front with shower and Thunderstorm chances in advance. 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 231351
afdbox
area forecast discussion
national weather service boston norton ma
951 am edt Wed may 23 2018

Synopsis
Isolated showers move offshore this morning, with a second set
of showers possible this evening. Expect dry and warming
weather Thursday and Friday. Saturday will also be warm, just
before a cold front sweeps south across southern new england
generating a few showers and scattered thunderstorms. Although
it will not be a washout, the potential for showers will linger
through the remainder of the memorial day weekend.

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

low clouds fog patches earlier this morning have quickly given
way to partial sunshine in most locations. 850t between +11c
and +12c along with good mixing should yield highs in the
lower 80s in many locations... Except a bit cooler where
localized sea breezes occur.

Dry weather generally prevails... But a shortwave may trigger a
brief spot shower or two late this afternoon evening across
eastern ma. Nothing more than than expected given lack of
low level moisture.

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

isolated shower activity over N E ma this evening, otherwise dry,
turning cool. H3 jet streak amplified, diving S in response to
enhanced upstream ridging, a n-stream vort-lobe and attendant colder
h85 temperatures skirt by. N surface wind response, onshore along
the coast. Drier airmass pushing across the region, lowering both
dewpoints and temperatures. Push lows down into the upper 40s for
many locations, potential impacts to sensitive vegetation.

Thursday...

high pressure in control, another pleasant day on tap. However
beneath continued influence of skirting n-stream vort-lobe cooler
airmass. Light winds overall, allowance of sea-breezes along the
coast. Mixing up to around h85, can't rule out a few W wind gusts
along the interior, especially over high terrain. Mixing drier air
as well, dewpoints falling into the 30s for interior locations.

Long term Thursday night through Tuesday
Big picture...

upper ridge over the northeast usa de-amplifies with time by the
weekend, leaving a more zonal flow over the weekend and early next
week. A shortwave trough ejects from the western usa into this zonal
flow, eventually moving over the northeast usa early next week.

Southern stream upper trough hovers over the gulf of mexico and
brings tropical moisture to the gulf coast. The ECMWF keeps the
tropical moisture south of mason-dixon through the period, while the
gfs makes a stronger effort to move it up the east coast but then
stalls out south of long island.

Contour fields from Thursday onward remain above normal, although
not excessively so. Thermal fields are near normal Thursday, then
above normal most of the time through next Tuesday. The thermal
fields do dip close to normal Sunday and Monday especially over ne
mass. An easterly flow Sunday and Monday due to high pressure over
the maritimes suggests a cooler surface layer underneath the warm
deep layer, thus supporting the thermal indicators.

Model mass and thermal fields are in general agreement through
Saturday, then show growing differences early next week. Forecast
confidence is good through Saturday, then diminishes to low early
next week.

Concerns...

Thursday night through Saturday...

high pressure offshore provides a west-southwest surface wind, so
most places should warm up. The only air conditioning will be where
this flow is an ocean flow, such as the outer CAPE and parts of cape
ann. Mixing is forecast to reach about 825 mb each day, temps at
that level support MAX sfc temps in the mid to upper 80s. Can't
rule out a 90, especially if the mixing GOES a little deeper
than expected.

A cold front moves south Saturday. Precipitable water values build
ahead of the front with GFS values reaching 1.5 inches Saturday
afternoon evening. Model consensus shows total-totals in the upper
40s at that same time; mid level lapse rates are forecast at 6 to
6.5 c km, and lifted indices away from the south coast go sub-zero.

So the potential is there for scattered thunder along with the
showers. The front moves through early Saturday night, with winds
shifting from the northeast behind the front.

Sunday-Tuesday...

the cold front stalls just south of the region Sunday, with northern
stream high pressure building over the maritimes. This should bring
cooler temperatures Sunday and Monday, most notable in eastern mass.

With the front stalled nearby and weak disturbances moving
through the flow, a chance of showers will linger each day with
best chance along the south coast. As noted above, there remains
uncertainty with how much tropical moisture works up the coast
during the early week as well as if it reaches our area. This
event, or non-event, remains in the low confidence part of the
forecast. So we will maintain chance pops for this part of the
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 ... High confidence.

Today... Most locations have already becomeVFR and any lingering
lower CIGS vsbys near the south coast should improve by lunch
time. Generally looking at NW winds of 5 to 15 knots but
localized sea breezes likely for a time this afternoon.

Tonight...VFR.

Thursday...

vfr. Sea-breezes along the coast.

Kbos terminal... High confidence inVFR conditions. Potential
sea- breeze around midday but probably is short-lived and done
by early evening.

Kbdl terminal... High confidence inVFR conditions.

Outlook Thursday night through Sunday ... Moderate confidence.

Thursday night through Friday night:VFR. Breezy.

Saturday: mainlyVFR, with areas MVFR possible. Breezy. Chance
shra, slight chance tsra.

Saturday night: mainly MVFR, with local ifr possible. Chance
shra, slight chance tsra, patchy br.

Sunday: mainly MVFR, with local ifr possible. Chance shra.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday ... High confidence.

A series of cold fronts later this morning and again this
evening, high pressure thereafter which will shift gradually e
into the end of the week. Low clouds, fog, visibility issues
ahead of the front with scattered showers, some thunder possible
over the S waters this morning. Clearing out, high pressure
building in, a weak pressure gradient, winds for the most part
will be light allowing near-shore sea-breezes during the day.

Outlook Thursday night through Sunday ... Moderate confidence.

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

Friday: low risk for small craft advisory winds with gusts up
to 25 kt. Areas of seas approaching 5 ft.

Friday night: low risk for small craft advisory winds with
gusts up to 25 kt. Local rough seas.

Saturday: winds less than 25 kt. Areas of seas approaching
5 ft. Slight chance of rain showers, slight chance of
thunderstorms.

Saturday night: winds less than 25 kt. Areas of seas
approaching 5 ft. Chance of rain showers, slight chance of
thunderstorms.

Sunday: winds less than 25 kt. Local rough seas. Chance of rain
showers.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Wtb sipprell
near term... Frank
short term... Sipprell
long term... Wtb
aviation... Frank sipprell wtb
marine... Wtb sipprell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 9 mi41 min 56°F
WAXM3 - Waquoit Bay Reserve, MA 15 mi86 min 2.9 61°F 1012 hPa58°F
44020 - NANTUCKET SOUND 15 mi31 min WSW 7.8 G 9.7 57°F 55°F1012.2 hPa55°F
BZBM3 - 8447930 - Woods Hole, MA 24 mi41 min 57°F 57°F1012.3 hPa
NTKM3 - 8449130 - Nantucket Island, MA 31 mi47 min WSW 8 G 13 57°F 59°F1012.2 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 35 mi81 min WSW 5.8 G 7.8 53°F 1 ft1011.4 hPa (+0.0)53°F
BUZM3 - Buzzards Bay, MA 45 mi71 min SW 14 G 15 54°F 1012.6 hPa (+0.0)
FRVM3 - 8447386 - Fall River, MA 46 mi47 min 63°F 58°F1012.3 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 47 mi41 min SW 7 G 8 62°F 1011.8 hPa
FRXM3 47 mi41 min 65°F 59°F
44013 - BOSTON 16 NM East of Boston, MA 48 mi81 min W 3.9 G 3.9 57°F 56°F1 ft1011.2 hPa (+0.0)56°F

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA2 mi15 minNW 1010.00 miMostly Cloudy68°F57°F70%1011.7 hPa
Otis Air National Guard Base, MA13 mi16 minW 710.00 miOvercast64°F59°F83%1012.5 hPa
Chatham, Chatham Municipal Airport, MA16 mi19 minNW 810.00 miOvercast67°F57°F71%1012.2 hPa
Provincetown Municipal Airport, MA21 mi15 minW 710.00 miFair65°F57°F76%1012 hPa

Wind History from HYA (wind in knots)
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Last 24hrS6S5S6S6S7S7S7S3S5S6S8S7S4S3CalmSW3CalmSW5SW7SW5W4NW6NW6NW10
1 day agoN6N7S9S7S10S9S9S9S7SW5SW6SW9SW6SW7SW5SW7SW4SW5SW3SW3CalmS6SW5S7
2 days agoSW21
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SW11S9SW7SW5S4SW4CalmNW6N6N4N7N7N7N7N5N5N9N9
G16
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Tide / Current Tables for Barnstable Harbor, Beach Point, Massachusetts
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Barnstable Harbor
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Wed -- 12:53 AM EDT     0.78 feet Low Tide
Wed -- 02:21 AM EDT     Moonset
Wed -- 05:14 AM EDT     Sunrise
Wed -- 06:49 AM EDT     10.14 feet High Tide
Wed -- 01:27 PM EDT     0.04 feet Low Tide
Wed -- 01:53 PM EDT     Moonrise
Wed -- 07:33 PM EDT     9.94 feet High Tide
Wed -- 08:01 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.30.81.73.45.67.99.710.19.4863.71.50.20.31.53.568.39.79.897.45.4

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
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Cape Cod Canal
Click for Map
Wed -- 01:34 AM EDT     3.88 knots Max Flood
Wed -- 02:22 AM EDT     Moonset
Wed -- 04:51 AM EDT     -0.17 knots Slack
Wed -- 05:15 AM EDT     Sunrise
Wed -- 07:48 AM EDT     -4.44 knots Max Ebb
Wed -- 11:02 AM EDT     0.01 knots Slack
Wed -- 01:54 PM EDT     Moonrise
Wed -- 02:18 PM EDT     4.26 knots Max Flood
Wed -- 05:44 PM EDT     -0.20 knots Slack
Wed -- 08:03 PM EDT     Sunset
Wed -- 08:28 PM EDT     -4.24 knots Max Ebb
Wed -- 11:42 PM EDT     0.19 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.23.83.83.52.6-1.1-3.3-4.2-4.4-4-3-0.62.93.94.24.23.72.6-1.6-3.5-4.2-4.2-3.6-2.4

Weather Map and Satellite Images
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wmap_A
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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (11,2,3,4)
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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.