Friday, August14, 2020
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Marine Weather and Tides
Barnstable Town, MA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 5:47AMSunset 7:43PM Friday August 14, 2020 7:15 AM EDT (11:15 UTC) Moonrise 1:01AMMoonset 4:29PM Illumination 20% Phase: Waning Crescent; Moon at 25 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- 416 Am Edt Fri Aug 14 2020
.gale watch in effect from Saturday morning through Saturday evening...
Today..NE winds 5 to 10 kt. Seas 1 foot or less.
Tonight..NE winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Gusts up to 25 kt. Seas around 2 ft.
Sat..NE winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to 5 ft. Patchy fog.
Sat night..NE winds 20 to 25 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Sun and Sun night..E winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers.
Mon and Mon night..E winds 10 to 15 kt, becoming n. Gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers.
Tue and Tue night..W winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 4 ft. 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 416 Am Edt Fri Aug 14 2020
Synopsis for massachusetts and rhode island coastal waters.. A cold front will stall south of our waters today. Behind the front, high pressure nudges in from southeast canada. Low pressure slides southeast of the waters on Saturday, possibly bringing gale force winds to parts of the outer waters Saturday into early 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 140816 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 416 AM EDT Fri Aug 14 2020

SYNOPSIS.

It will still be warm this afternoon, but high pressure building across the Canadian Maritimes will result in cool temperatures this weekend especially across eastern Massachusetts. Low pressure may bring a period of showers sometime Sunday into Monday, but if it passes too far south mainly dry weather will persist. Temperatures should recover to seasonable levels by Tuesday and persist at those levels into Thursday with mainly dry weather.

NEAR TERM /UNTIL 6 PM THIS EVENING/.

* Seasonable and mostly dry conditions today with scattered showers in Western MA and CT in the afternoon.

Today looks to be a tad cooler than Thursday with 850mb temperatures falling to +14C. With an inverted 500mb trough extending into New England and an increasing baroclinic gradient, expect northeast flow to increase across our area. Temperatures wise, expect highs over Eastern MA and RI to top out in the upper 70s to low 80s while interior MA and CT top out in the mid 80s thanks to downsloping effect. Moreover, the differential terrain heating will result in better chances of widely scattered to isolated showers towards the Berkshires East Slopes and the CT River valley. There may even be a rumble of thunder but confidence is not high enough to mention thunderstorms. Otherwise, expect a mostly dry and seasonable day with a welcome break from the recent oppressive heat and humidity. Enjoy!

Forecast wise, used HREF ARW to yield widespread dew points in the 50s especially in the afternoon hours since Bufkit indicates deep mixing up to 850mb. Also blended in MOS guidance since temperatures tend to overperform on days with deep mixing. Even though it can get a little toasty with highs in the mid to even upper 80s towards the CT River valley, dew points in the low to mid 50s along with a northerly breeze will make it quite comfortable for outdoor activities by mid August standards in Southern New England.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SATURDAY/.

Tonight:

Dry and pleasant evening with lows across the interior falling into the upper 50s to low 60s. Closer to the coast, lows fall into the mid 60s with a low level jet developing over Eastern MA overnight. NE winds increase to 15-25 mph toward daybreak Saturday. This increasing low level jet will likely bring stratocumulus clouds onshore into eastern MA toward morning.

Saturday:

* Unseasonably cool and blustery for Eastern MA and RI. * High Surf Advisories are issued for most beaches on Saturday.

An unseasonably cool, cloudy, breezy (blustery in the afternoon, especially near the Eastern MA coast) but mostly dry day is in store. Surface high in the Canadian Maritimes combined with a disturbance passing well to our southeast will help reinforce the cool northeast flow for much of our area. The big temperature difference between the near-surface air (+15C at 925mb) and the ocean waters (mid to upper 70s for the southern waters) will help promote good mixing, helping to bring down some of the 30-35 kt winds between 850 and 925 mb. In fact, both the GEFS and NAEFS show the 850mb and 925mb jet at 3 to 4 standard deviations above normal!

It will certainly feel fall-like and even raw at times especially after such an anomalously hot stretch of weather. In general, expect highs to be 5-10 degrees below climatological normal with highs only in the low to mid 70s for Eastern MA and RI. Though the SSTs in our immediate ocean waters are in the mid to upper 70s, SSTs in Gulf of Maine are in the upper 50s to low 60s. With such a strong NE flow, the air will originate from over waters that are considerably cooler, lending more confidence in highs only reaching the low 70s off the Eastern MA coast. On the other hand, Western MA and CT are expected to be warmer in the upper 70s to perhaps low 80s thanks to more sunshine. Rain chances wise, expect mostly dry conditions but with a cool northeast flow regime, can't rule out widely scattered to isolated drizzle/light showers across Eastern MA and RI.

In addition, High Surf Advisories have been issued for all beaches except Boston Harbor due to 7-10 ft waves developing from the strong NE flow.

LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/.

Highlights .

* Below normal temps continue Sun especially along the coast

* Offshore low may bring a period of showers sometime Sun into Mon, but it may pass too far south resulting in just a few spot showers

* High Surf/Dangerous rip currents will persist Sun and possibly Mon

* Seasonable summer warmth returns by Tue and continues through Thu

Details .

Saturday night .

Departing offshore wave of low pressure will still generate some gusty northeast winds Saturday night along the coast. A few showers will be possible mainly along the southeast New England coast, but a washout is not expected. Temperatures will mainly be in the 60s Sat night, but will feel a bit cool along the coast with the gusty NE winds.

Sunday and Monday .

Low pressure will emerge off the mid Atlantic coast and pass southeast of the Benchmark Sunday into Monday. There is uncertainty on its specific track and how far northwest the main shield of rain gets. The guidance remains split with the ECMWF/UKMET keeping the track far enough south, where we would end up mainly dry with just a few spot showers. The GFS/CMC have trended a bit further south over the last 24 hours, but still indicate a period of showers may impact areas for a time especially near the south coast. Still need to keep options open, but odds for widespread significant rainfall appear low at this time.

Relatively cool temperatures will persist on Sunday with highs mainly in the 70s and probably a lot of clouds. Coolest temps will be along the eastern MA coast. We may see temps rebound a bit by Monday especially in the CT River Valley where the best chance exists for temps to exceed 80.

High Surf .

High surf along with dangerous rip currents will likely persist Sunday and perhaps into Monday, especially along east facing ocean exposed beaches with anomalously high seas just off shore for the middle of August.

Tuesday through Thursday .

High pressure will have shifted east of the Canadian Maritimes by Tuesday. This will bring an end to the onshore flow, other than localized diurnal sea breezes. Temperatures should return to seasonable levels with highs mainly in the 80s away from the immediate coast/sea breeze potential. Do not see any big precipitation threats, so while a few showers can not be ruled out dry weather should dominate.

AVIATION /08Z FRIDAY THROUGH TUESDAY/. Forecaster Confidence Levels .

Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.

0730Z TAF Update:

Rest of tonight: High confidence.

VFR conditions except for local IFR to MVFR where patchy fog has developed. Light and variable winds.

Today: High confidence

VFR conditions with slight chance of showers in Western MA and CT. NE winds at 5 to 10 kt.

Tonight: High confidence.

VFR to start but MVFR/IFR possible late especially across eastern MA with increasing NE winds bringing low clouds onshore. NE winds 5-10 kt, gusting 15-20 kt towards daybreak across the Eastern MA/RI terminals.

Saturday: Moderate confidence.

VFR to start but Eastern MA/RI terminals should see deterioration to IFR to MVFR ceilings by late morning. Interior MA/CT terminals should remain mostly VFR. Slight chance for showers but main concern is strong NE winds 15-20 kt, with up to 25 kt winds and 35 kt gusts possible on the Cape and Island terminals.

KBOS Terminal . High confidence in TAF.

KBDL Terminal . High confidence in TAF.

Outlook /Saturday Night through Tuesday/ .

Saturday Night: MVFR/IFR conditions possible. Windy with local gusts up to 30 kt. Slight chance SHRA.

Sunday through Sunday Night: Mainly MVFR, with local IFR possible. Breezy. Chance SHRA.

Monday: Mainly MVFR, with areas VFR possible. Breezy. Chance SHRA.

Monday Night: Mainly VFR, with areas MVFR possible. Breezy. Chance SHRA.

Tuesday: Mainly VFR, with local MVFR possible. Breezy. Slight chance SHRA.

MARINE.

Today . NE winds 5-10 kt increasing to 10-15 kt by the afternoon. Dry weather and good vsby.

Tonight . Low pressure develop well south of New England, with NE winds increasing to 10-15 kt with 20-25 kt gusts by Saturday daybreak.

Saturday . Gale-force winds with 30-35 kt gusts possible for waters off the Outer Cape, the islands and MA/RI south coast. As a result, Gale Watches have been issued for the aforementioned waters and Small Craft Advisories for the remainder of the waters.

Outlook /Saturday Night through Tuesday/ .

Saturday Night: Moderate risk for Small Craft Advisory winds with local gusts up to 30 kt. Rough seas up to 10 ft. Slight chance of rain showers.

Sunday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Chance of rain showers.

Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas. Chance of rain showers.

Monday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Chance of rain showers.

Monday Night: Winds less than 25 kt. Areas of rough seas. Chance of rain showers.

Tuesday: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . High Surf Advisory from 8 AM to 8 PM EDT Saturday for MAZ007- 019-022>024. RI . High Surf Advisory from 8 AM to 8 PM EDT Saturday for RIZ008. MARINE . Gale Watch from Saturday morning through Saturday evening for ANZ232-254>256. Small Craft Advisory from 4 AM Saturday to 8 AM EDT Sunday for ANZ231-233>235-237-250-251. Small Craft Advisory from 7 AM to 10 PM EDT Saturday for ANZ230-236.

SYNOPSIS . Chai/Frank NEAR TERM . Chai SHORT TERM . Chai LONG TERM . Frank AVIATION . Chai/Frank MARINE . Chai/Frank


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 10 mi26 min N 12 G 16 77°F1 ft
WAXM3 - Waquoit Bay Reserve, MA 12 mi91 min WNW 1 102°F 1017 hPa
44090 15 mi19 min 66°F
BZBM3 - 8447930 - Woods Hole, MA 20 mi46 min 73°F 1017 hPa
NTKM3 - 8449130 - Nantucket Island, MA 26 mi46 min NE 2.9 G 5.1 74°F 1017.2 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 41 mi26 min NNW 3.9 G 5.8 69°F 1 ft1017.3 hPa (-0.0)65°F
BUZM3 - Buzzards Bay, MA 42 mi76 min NNE 7 G 8 1017.7 hPa (-0.3)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi46 min N 1.9 G 2.9 72°F 1017.5 hPa
FRVM3 - 8447386 - Fall River, MA 46 mi46 min 71°F 1017.6 hPa
FRXM3 46 mi46 min 70°F 68°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, MA4 mi20 minN 410.00 miFair72°F66°F82%1016.9 hPa
Otis Air National Guard Base, MA11 mi21 minNNE 610.00 miFair70°F64°F83%1017.3 hPa
Chatham, Chatham Municipal Airport, MA18 mi24 minNNE 410.00 miFair72°F60°F66%1017.4 hPa
Marthas Vineyard Airport, MA22 mi23 minNNE 310.00 miFair70°F64°F84%1016.9 hPa

Link to 5 minute data for KHYA

Wind History from HYA (wind in knots)
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Last 24hrNW6N7N9N9N7N7N6N6N3N4N6CalmCalmCalmCalmCalmNE3CalmCalmNE3N3N4N6N4
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Tide / Current Tables for Hyannis Port, Nantucket Sound, Massachusetts
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Hyannis Port
Click for Map
Fri -- 01:00 AM EDT     Moonrise
Fri -- 02:20 AM EDT     0.35 feet Low Tide
Fri -- 05:49 AM EDT     Sunrise
Fri -- 09:08 AM EDT     2.61 feet High Tide
Fri -- 02:32 PM EDT     0.49 feet Low Tide
Fri -- 04:29 PM EDT     Moonset
Fri -- 07:41 PM EDT     Sunset
Fri -- 09:20 PM EDT     3.02 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.40.70.40.40.81.21.622.42.62.52.11.510.60.50.91.41.92.32.732.92.6

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
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Cape Cod Canal
Click for Map
Fri -- 01:01 AM EDT     Moonrise
Fri -- 02:55 AM EDT     3.48 knots Max Flood
Fri -- 05:50 AM EDT     Sunrise
Fri -- 06:32 AM EDT     -0.01 knots Slack
Fri -- 09:15 AM EDT     -3.63 knots Max Ebb
Fri -- 12:19 PM EDT     0.16 knots Slack
Fri -- 03:18 PM EDT     3.41 knots Max Flood
Fri -- 04:30 PM EDT     Moonset
Fri -- 06:45 PM EDT     -0.16 knots Slack
Fri -- 07:42 PM EDT     Sunset
Fri -- 09:41 PM EDT     -3.90 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.92.63.33.53.32.81.8-1.8-3.1-3.6-3.5-2.8-1.4233.43.32.92.1-1.3-3-3.8-3.9-3.4

Weather Map
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GEOS 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 (7,2,3,4)
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Ground Weather Radar Station Boston, MA
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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 numerous 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.