Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
Barnstable Town, MA

Version 3.4
What's New / NOTES
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.
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.

Sunrise 5:43AMSunset 7:34PM Wednesday April 25, 2018 2:13 PM EDT (18:13 UTC) Moonrise 2:54PMMoonset 3:44AM Illumination 79% 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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ANZ232 Nantucket Sound- 116 Pm Edt Wed Apr 25 2018
.small craft advisory in effect through Thursday afternoon...
This afternoon..SE winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Patchy fog. Rain with isolated tstms. Some tstms may produce heavy rainfall. Vsby 1 nm or less.
Tonight..SE winds 15 to 20 kt, becoming S 10 to 15 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 ft. Areas of fog. Rain likely. Vsby 1 nm or less.
Thu..SW winds 10 to 15 kt with gusts up to 20 kt, increasing to 15 to 20 kt with gusts up to 30 kt in the afternoon. Seas 2 to 4 ft. Areas of dense fog. A chance of showers. Vsby 1 nm or less.
Thu night..SW winds 15 to 20 kt with gusts up to 25 kt, becoming W 5 to 10 kt after midnight. Seas 2 to 4 ft.
Fri..SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft. Showers likely.
Fri night..S winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Showers likely.
Sat..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Sat night..W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Sun..W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Sun night..W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. 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 116 Pm Edt Wed Apr 25 2018
Synopsis for massachusetts and rhode island coastal waters.. Expect showers across the waters as low pressure approaching from the southwest this afternoon lifts across new england tonight. Another low will approach from the southwest on Friday resulting in showers across the waters Friday evening, before it lifts over new england Friday night. A cold front will cross the waters late Saturday with a few showers possible. Dry high pressure will build in from the west Saturday night and Sunday. 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 Barnstable Town, MA
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location: 41.63, -70.31     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 251414
afdbox
area forecast discussion
national weather service boston norton ma
1014 am edt Wed apr 25 2018

Synopsis
Low pressure will push northeast from the mid atlantic coast,
crossing the region today. This will bring locally heavy
downpours may result in some brief poor drainage street flooding
and possibly an isolated thunderstorm or two. Seasonably mild
temperatures will follow for the remainder of the week with
mainly dry weather other than a brief period of rain showers
likely Friday. A cool down will occur Saturday night and Sunday,
but this will be short lived as unseasonably warm temperatures
appear to be in store for the region by the middle of next week.

Near term until 6 pm this evening
*** locally heavy rainfall and isolated thunderstorms possible
this afternoon and evening ***
1030 am update...

waa showers continue across the region this morning and will
advance northward. A lull or very light precip will occur over
the next few hours before the next batch of heavy rainfall south
of long island will move into the region. This heavy rainfall
will be associated with the nose of the LLJ and higher theta-e
plume and moisture advection.

Went ahead and adjusted the forecast to bring it more in line
with current conditions. But overall everything is on track for
today.

Previous discussion...

shortwave has increased the forcing for ascent and has allowed
light rain to overspread the region early this morning. Guidance
still indicates the heavy rain isolated thunder threat this
afternoon and early evening... Particularly across eastern ma ri
which previous forecast captures nicely. No major changes to the
forecast needed.

Heavier bands of rain noted on radar across W nj and just off
the DELMARVA peninsula, heading n-ne. Pwat values of 1.2 to 1.3
inches will move across the region, which will produce bands of
heavy rainfall. Most model output, especially the high res arw
and nmm guidance, all signaled locally heavy rain bands
developing by around 17z-18z mainly across E mass into ri,
possibly as far W as worcester county and NE ct. Could see some
heavier rain across N ct through midday, then pushing E during
the afternoon. The strong e-se winds will also help feeding low
level moisture across the region.

Some locally heavy rainfall is possible across portions of
central and E mass into ri and NE ct this afternoon and evening.

With the brief, heavy downpours, may see some street and poor
drainage flooding occurring. Will monitor this aspect very
closely. Noted that wpc has issued a marginal risk for local
flooding in any downpours. Will issue a special weather
statement on this.

E-se winds may briefly gust up to 30-35 kt especially across s
coastal mass and ri this afternoon. Very strong low level jet,
on the order of 55-60 kt, passing across the region. However,
rather low lapse rates holds back the mixing from aloft. There
is a low risk for isolated thunderstorms in place with decent
instability in place. Noting lis from zero to -1, k indices in
the lower 30s and tts in the lower 50s. So, if any thunder does
occur, could see some gusty winds mix down in the convection.

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

low pressure will push across the region, heading to northern
new england by around 12z-14z Thursday. Will still see some
heavy rainfall across E mass into E ri this evening, then will
push offshore by around midnight.

With a lot of low level moisture in place, along with SE winds
shifting to sw, will see low clouds and areas of fog lingering
through the night. The fog may reduce visibilities below 1 2
miles especially along S coastal areas. May see improving
conditions move into western areas around 09z or so even with
lingering showers.

Drier air will start working across the region during Thursday.

A few showers may linger across N central and W mass, mainly
across the E slopes of the berkshires. Skies will become partly
to mostly sunny across most areas by midday or early afternoon
as winds shift to w. Temperatures should rebound to near normal
levels for late april.

Long term Thursday night through Tuesday
Highlights...

* a 1-3 hour period of rain showers likely fri
* milder Sat with just a few brief afternoon evening showers possible
* dry and noticeably cooler Sun with frost potential late Sun night
* dry weather Mon Tue Wed with a significant warming trend and the
potential for 80+ in some locations by the middle of next week
details...

Thursday night...

a ridge of high pressure will result in a dry tranquil night. Low
temperatures should bottom out in the upper 30s to the middle 40s in
most locales.

Friday...

shortwave trough remains to our west and it will eject a piece of
energy into our region on southwest flow aloft. Appears there will
be enough forcing for a 1 to 3 hour period of rain showers sometime
Friday into early Friday evening. Certainly not looking at a lot of
rain... But appears the likelihood that most locations do see a
brief period of rain showers. Clouds and the likelihood of a brief
period of wet weather should hold high temps mainly in the
lower 60s.

Saturday and Saturday night...

a milder day is on tap for Saturday ahead of an approaching cold
front. Southwest flow and partial sunshine should allow high
temperatures to recover well into the 60s to possible around 70 in a
few locales. While dry weather should dominate... An approaching
cold front may trigger a few brief showers during the
afternoon evening. Greatest risk will be across western ma... Where
forcing moisture will be a bit deeper. Turns cooler Sat night
behind the cold front. Low temps by daybreak Sun should be down
into the upper 30s and lower 40s.

Sunday and Sunday night...

deep trough sets up across the northeast with anomalously low height
fields. It will be noticeably cooler... But highs should still top
out well into the 50s with good mixing in northwest flow along with
the benefit of the increasing spring Sun angle. The dry airmass in
place will allow for chilly temps late Sun night into early Mon am.

Lows should bottom out in the upper 20s to the middle 30s in many
locations. Frost headlines may eventually need to be considered
where the growing season has officially started.

Monday through Wednesday...

the northeast trough quickly moves east of the region Monday and
will be replaced by strong upper level ridging by the middle of next
week. The result should be dry weather with a significant warmup.

High temps should recover into the lower to middle 60s
mon... Probably well into the 70s by tue... And the potential for some
80 plus degree readings on wed. A weak pressure gradient will
likely allow for sea breezes and cooler conditions along the coast
at times. Nonetheless... At least a taste of summer afternoon warmth
appears to be in the cards for much of the region.

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 ... Moderate to high confidence.

Today... Conditions lowering to MVFR-ifr from sw-ne during the
morning. Rain will become steady with e-se wind flow in place.

Areas of lifr CIGS will push into NE ct ri SE mass around
midday, and may reach further inland during the afternoon. Bands
of +ra developing across central and eastern areas this
afternoon. Isolated thunder late. Low risk for 35 kt gusts
across the south coastal terminals. Otherwise strong llws
through much of the day.

Tonight... Ifr-lifr conditions. Areas of +ra with heavy downpours
across E mass ri and isolated tsra through around midnight, then
moving offshore. Low CIGS and areas of fog will linger across
the coastal plain much of the night.

Thursday... Ifr CIGS vsbys early, then should improve toVFR
from sw-ne as winds shift to SW and diminish. May see gusts up
to 25 kt through midday. Rain showers end, though may linger
across N central and W mass through the day.

Kbos terminal... High confidence in taf. Conditions should lower
to MVFR by late morning in rain and lower ceilings. Occasional
+ra and ifr conditions by the afternoon evening push and e-se
wind will keep CIGS through tonight. Low risk for tsra from 21z-
04z.

Kbdl terminal... High confidence in taf. MVFR conditions lower to
ifr by late morning with some +ra at midday. Ifr- lifr
conditions from mid morning through tonight, and may linger into
the early portion of the Thursday morning push.

Outlook Thursday night through Sunday ... Moderate to high
confidence.

Thursday night:VFR.

Friday and Friday night: a period of MVFR to localized ifr
conditions likely in a round of rain showers sometime Friday
into early Friday evening.

Saturday through Saturday night:VFR. Breezy. Slight chance
shra.

Sunday:VFR. Breezy.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday ...

today through tonight... Moderate confidence.

Small craft advisories for all waters except boston harbor.

Expect e-se winds gusting up to 30 kt. Low risk for a few 35
knot gusts early in the evening across the southeast waters.

Rough seas up to 10 to 12 ft. Rain showers, heavy at times
along with areas of fog and isolated thunderstorms. Visibility
1 to 3 nm today, locally below 1 nm at times across the southern
waters tonight.

Thursday... Moderate to high confidence.

Small craft conditions continue as winds shift to sw, though
winds diminish during the day. May see gusts up to 25 kt
through midday. Rain showers and visibility improves by around
midday. Seas remain at 5 feet or greater through the day across
the open waters as well as the south bays and sounds.

Outlook Thursday night through Sunday ... Moderate to high
Thursday night: winds less than 25 kt. Areas of rough seas.

Friday: winds less than 25 kt. Seas up to 5 ft. Rain showers
likely.

Friday night: winds less than 25 kt. Seas up to 5 ft. Slight
chance of rain showers.

Saturday: winds less than 25 kt. Seas up to 5 ft.

Saturday night: winds less than 25 kt. Seas up to 5 ft. Slight
chance of rain showers.

Sunday: low risk for small craft advisory winds with gusts up
to 25 kt. Seas up to 5 ft.

Equipment
The NOAA weather radio transmitter serving providence is out of
service due to phone line problems. The phone company has
prioritized the issues and is working to get the weather
broadcast back on the air as soon as possible. The transmitter
serving hyannis is back in service.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory from 2 pm this afternoon to 6 pm edt
Thursday for anz232.

Small craft advisory until 6 pm edt Thursday for anz233-234-
250.

Small craft advisory from 4 pm this afternoon to 1 am edt
Thursday for anz231.

Small craft advisory from 2 pm this afternoon to 11 am edt
Thursday for anz236.

Small craft advisory until 6 pm edt Thursday for anz235-237-
254>256.

Small craft advisory from 3 pm this afternoon to 6 pm edt
Thursday for anz251.

Synopsis... Frank evt
near term... Frank dunten
short term... Evt
long term... Frank
aviation... Frank evt
marine... Frank evt
equipment... Staff


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WAXM3 - Waquoit Bay Reserve, MA 12 mi89 min 8 53°F 1016 hPa51°F
44090 15 mi44 min 44°F3 ft
44020 - NANTUCKET SOUND 15 mi84 min SE 19 G 23 51°F 46°F2 ft1015.2 hPa (-3.1)51°F
BZBM3 - 8447930 - Woods Hole, MA 20 mi44 min 54°F 46°F1013.8 hPa
NTKM3 - 8449130 - Nantucket Island, MA 26 mi44 min SE 13 G 22 52°F 51°F1014.8 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 41 mi84 min SE 19 G 23 48°F 42°F3 ft1016.4 hPa (-3.1)46°F
BUZM3 - Buzzards Bay, MA 42 mi74 min ESE 26 G 28 49°F 1013.4 hPa (-3.8)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi44 min SE 16 G 21 56°F 1013 hPa
FRVM3 - 8447386 - Fall River, MA 46 mi44 min 56°F 48°F1013.5 hPa
FRXM3 46 mi44 min 56°F 54°F

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
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G12

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA4 mi78 minSE 10 G 174.00 miLight Rain Fog/Mist52°F50°F93%1015.1 hPa
Otis Air National Guard Base, MA11 mi79 minSE 162.50 miLight Rain Fog/Mist52°F51°F100%1015.6 hPa
Chatham, Chatham Municipal Airport, MA18 mi82 minSE 9 G 176.00 miLight Rain Fog/Mist52°F50°F93%1016.7 hPa
Marthas Vineyard Airport, MA22 mi81 minSE 15 G 264.00 miLight Rain Fog/Mist52°F51°F97%1014.5 hPa

Wind History from HYA (wind in knots)
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G20
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S11S10S5S6S73SE3CalmSE45SE5SE5SE8
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1 day agoN6N6SE11SE8SE7S5S4S6S5SW5S4S5S5CalmNE3CalmCalmCalmSW8S7S8S8S11S11
G17
2 days agoN9
G15
NE9S11SE6S4S5S6SW5S6SW4SW5SW3CalmCalmNW7NW7N6N6N8N7N10N8N7NE7

Tide / Current Tables for Hyannis Port, Nantucket Sound, Massachusetts
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Hyannis Port
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Wed -- 02:16 AM EDT     0.15 feet Low Tide
Wed -- 03:43 AM EDT     Moonset
Wed -- 05:46 AM EDT     Sunrise
Wed -- 09:02 AM EDT     3.31 feet High Tide
Wed -- 02:54 PM EDT     -0.08 feet Low Tide
Wed -- 02:54 PM EDT     Moonrise
Wed -- 07:32 PM EDT     Sunset
Wed -- 09:43 PM EDT     3.24 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.30.60.20.30.71.21.82.53.13.33.12.61.70.80.1-0.10.20.61.21.92.63.13.22.9

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Wed -- 03:21 AM EDT     1.71 knots Max Flood
Wed -- 03:42 AM EDT     Moonset
Wed -- 05:45 AM EDT     Sunrise
Wed -- 06:14 AM EDT     -0.00 knots Slack
Wed -- 09:03 AM EDT     -1.57 knots Max Ebb
Wed -- 12:10 PM EDT     0.00 knots Slack
Wed -- 02:53 PM EDT     Moonrise
Wed -- 03:54 PM EDT     2.03 knots Max Flood
Wed -- 06:55 PM EDT     -0.00 knots Slack
Wed -- 07:31 PM EDT     Sunset
Wed -- 09:49 PM EDT     -1.62 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.91.41.71.61.10.2-0.7-1.4-1.6-1.4-0.9-0.20.71.41.921.81-0.1-1-1.5-1.6-1.4

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 (14,3,4,5)
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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.