Tuesday, July7, 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 5:12AMSunset 8:19PM Tuesday July 7, 2020 4:09 AM EDT (08:09 UTC) Moonrise 10:26PMMoonset 7:30AM Illumination 96% Phase: Waning Gibbous; Moon at 17 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 Am Edt Tue Jul 7 2020
Rest of tonight..SE winds around 5 kt. Seas 1 foot or less.
Tue..SE winds 5 to 10 kt. Seas around 2 ft.
Tue night..S winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. A chance of showers.
Wed..S winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Gusts up to 20 kt. Seas 2 to 3 ft.
Wed night..SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Patchy fog.
Thu and Thu night..S winds 5 to 10 kt. Seas around 2 ft.
Fri..SE winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers.
Fri night through Sat night..SW winds 5 to 10 kt with gusts up to 20 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 116 Am Edt Tue Jul 7 2020
Synopsis for massachusetts and rhode island coastal waters.. A stationary frontal boundary sits south of southern new england waters over night. High pressure brief returns for Tuesday, then a warm front lifts from southwest to northeast on Wednesday.
Outlook.. An area of high pressure returns for the second half of the week, this allows for fair conditions. We are watching next weekend for an area of low pressure to move north along the eastern seaboard. 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 070803 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 403 AM EDT Tue Jul 7 2020

SYNOPSIS.

A frontal boundary south of our region will result in dry and comfortable weather today. This front lifts north of our region tonight with a few showers, but its main impact will be to deliver summerlike warmth and humidity the rest of the week into the weekend. Showers/thunderstorms will be possible each day with some heavy downpours, but much of this time will also feature dry weather. A stronger system late Friday into Saturday brings heavy rain and potential flooding issues.

NEAR TERM /UNTIL 6 PM THIS EVENING/.

4 AM Update .

* Dry & Pleasant Weather Today

High pressure across the Canadian Maritimes will keep the summer heat/humidity west and south of our region today. Across southern New England a modified maritime airmass will result in high temperatures in the upper 70s to the lower 80s under a mixture of sun and clouds. The bulk of the cloud will be in the CT River Valley on the eastern edge of the deeper moisture. Relative humidity values will be quite pleasant for July standards.

The high pressure system across the Maritimes will keep the instability along with the shower/thunderstorm threat to the west and south of our region today. Therefore, will be going with a dry forecast today.

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

* A few strong to severe thunderstorms with heavy rain possible Wednesday afternoon/evening across western & northern MA

Tonight .

The high pressure system moves southeast of the Canadian Maritimes tonight. This will allow a return southerly flow of increasing low level moisture. There will be an increase in elevated instability and with just enough of a southerly LLJ a few showers with perhaps a rumble or two of thunder will be possible. Certainly not a washout, but the risk exists for a few showers particularly after midnight. We should also see low clouds and some patches of fog develop tonight with the increasing low level moisture. Overnight low temps should only drop into the middle to upper 60s.

Wednesday .

It will be warm on Wednesday, but more importantly become rather humid with dewpoints near 70. Afternoon high temps should reach into the 80s, but heat indices will reach the lower 90s in some locations.

We may see a few showers Wednesday morning in the warm advection pattern, but not expecting a washout. The bigger concern will be from Wednesday afternoon and evening across western and northern MA. Given the high dewpoints in place, we should see 1500 to 2500 J/KG of Cape develop. A shortwave will also be dropping down in northwest flow aloft, which will trigger scattered showers and thunderstorms across northern New England. The better effective bulk shear and higher updraft helicity values courtesy of the HREF model are to the north of our region. This is where the highest risk for strong to severe thunderstorms exist.

That being said, western and northern MA are certainly not out of the woods. Effective shear of 25 knots and Capes potentially exceeding 2000 J/KG is certainly enough for a few strong to severe Wednesday afternoon and evening across western and northern MA. Main risk would be localized strong to damaging wind gusts. In addition, Pwats approaching 2 inches would result in a heavy rain/localized street flooding threat with the strongest storms. We will have to examine the trends of the high resolution CAMs as there is some uncertainty on timing and how far south this threat will get. Nonetheless, it certainly will need to be monitored.

LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/.

Highlights .

* Hot and humid conditions continue

* Scattered showers and thunderstorms on Thursday

* Widespread, heavy rain Friday into Saturday

Details .

A weak high pressure ridge keeps the hot and humid airmass in place on Thursday ahead of a deeper shortwave and closed upper low off the coast of the Carolinas which will bring widespread heavy rain Friday into Saturday. Aloft the mid level trough lags behind the coastal low, keeping shower and thunderstorm chances in the forecast through at least the weekend.

Thursday southerly flow around the offshore high keeps temperatures above normal (in the upper 80s to near 90) with oppressive humidity (low 70s). Given this, we'll have enough instability and moisture for scattered showers and thunderstorms, even though forcing is lacking. A cold front may come close enough to help but looks to stall somewhere to our NW. Wind fields aren't supportive of very organized convection, but can't rule out a strong to severe storm or two.

Eyes then turn to the Friday/Saturday time period where, if guidance is any indication, significant rainfall is likely. This is thanks to a coastal low sliding up from the Carolinas, pulled north ahead of the trough digging into the Great Lakes. This has the potential to bring showers and thunderstorms with gusty winds and very heavy downpours. Confidence in rainfall amounts and placement is low, depending heavily on the eventual low track. However, heavy rainfall looks fairly certain with this system given a very potent tap of tropical moisture . PWATs may cross into the 2.5-3 inch range! That would be 2-4 standard deviations above normal for mid July and would lead us to start thinking about the possibility of some flooding issues. Temperatures cool a bit from Thursday, into the low to mid 80s.

Confidence then drops a good deal in how things play out. After this system it looks to stay unsettled through early next week. The likely scenario is that the low lifts off into the maritimes while the mid level trough and cold pool aloft lag behind, keeping shower and thunderstorm chances around for Sunday ahead of yet another disturbance around Monday.

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

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

Today . High confidence. MVFR-IFR conditions mainly in some low clouds near the south coast and CT River Valley will improve to VFR this morning. Otherwise, VFR conditions continue elsewhere today.SSE winds of 10 to 15 knots develop with some gusts up to 20 knots by afternoon.

Tonight . Moderate confidence. Increasing low level moisture will result in widespread low clouds and fog patches overspreading the region. Timing a bit uncertain, but widespread low end MVFR-IFR conditions should develop as the night wears along. A few showers and the low risk for a rumble of thunder possible too.

Wednesday . Moderate confidence. MVFR-IFR conditions early should improve to mainly VFR by afternoon. A few spot showers possible in the morning, but perhaps a few strong thunderstorms near or after 18z across northern MA. Winds becoming SW at 10 to 15 knots with some gusts into the lower 20 knots possible.

KBOS Terminal . High confidence in TAF.

KBDL Terminal . Moderate confidence in TAF.

Outlook /Wednesday Night through Saturday/ .

Wednesday Night: VFR. Slight chance SHRA, isolated TSRA.

Thursday through Thursday Night: VFR. Chance SHRA, slight chance TSRA.

Friday: Mainly VFR, with local MVFR possible. Breezy. Chance SHRA, slight chance TSRA.

Friday Night: Mainly VFR, with areas IFR possible. Breezy. SHRA likely, slight chance TSRA.

Saturday: Mainly VFR, with local IFR possible. Breezy. Chance SHRA, isolated TSRA.

MARINE.

Today through Wednesday . High confidence.

High pressure over the Canadian Maritimes today will shift further southeast through Wednesday. The result will be SE winds of 10 to 15 knots shifting to the SW on Wednesday. Gusts to around 20 knots are possible this afternoon and perhaps some nearshore 20 to 25 knot gusts Wed afternoon. This may result in some choppy seas, but biggest concern will be the risk for a few strong t-storms Wed afternoon and evening across our eastern MA waters. Some patchy fog is expected across the southern waters early this morning and particularly overnight into Wednesday morning.

Outlook /Wednesday Night through Saturday/ .

Wednesday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers, isolated thunderstorms.

Thursday: Winds less than 25 kt.

Thursday Night: Winds less than 25 kt. Slight chance of rain showers, isolated thunderstorms.

Friday: Winds less than 25 kt. Local rough seas. Rain showers likely, slight chance of thunderstorms.

Friday Night: Winds less than 25 kt. Areas of rough seas. Rain showers likely, slight chance of thunderstorms.

Saturday: 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 . Frank/BW NEAR TERM . Frank SHORT TERM . Frank LONG TERM . BW AVIATION . Frank/BW MARINE . Frank/BW


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 10 mi40 min ESE 7.8 G 9.7 61°F 71°F1020.7 hPa59°F
WAXM3 - Waquoit Bay Reserve, MA 12 mi85 min ESE 1.9 63°F 1021 hPa61°F
44090 15 mi43 min 66°F
CHTM3 19 mi142 min S 6 G 7 59°F 1021.4 hPa
BZBM3 - 8447930 - Woods Hole, MA 20 mi52 min 70°F1021.7 hPa
NTKM3 - 8449130 - Nantucket Island, MA 26 mi52 min SE 5.1 G 8 73°F1021.7 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 41 mi80 min SSE 7.8 G 9.7 61°F 2 ft1021.3 hPa (+0.0)59°F
BUZM3 - Buzzards Bay, MA 42 mi70 min SSE 9.9 G 11 1022 hPa (-0.6)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi52 min SSW 5.1 G 7 1021.5 hPa
FRVM3 - 8447386 - Fall River, MA 46 mi52 min 73°F1021.7 hPa
FRXM3 46 mi70 min 65°F 62°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 mi74 minN 010.00 miOvercast63°F59°F87%1021.3 hPa
Otis Air National Guard Base, MA11 mi85 minE 310.00 miMostly Cloudy57°F57°F100%1021.3 hPa
Chatham, Chatham Municipal Airport, MA18 mi78 minVar 57.00 miOvercast59°F57°F93%1021.8 hPa
Marthas Vineyard Airport, MA22 mi77 minSSE 610.00 miMostly Cloudy61°F59°F93%1020.9 hPa

Link to 5 minute data for KHYA

Wind History from HYA (wind in knots)
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Last 24hrS7SW5W3N3N9N9N11NW10N10N14
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N10N8E7E3E3CalmCalmCalm3SE3Calm
1 day agoCalmCalmW5SW5S7S4SW7SW9S7S7SE8S9S11S7S10S9S7S9S8SW12SW9N9CalmCalm
2 days agoNE7N5N6N8N11N8N7N5N9N8N11N9NE7N93CalmCalmSE3CalmSE3SE4S4SE5Calm

Tide / Current Tables for Hyannis Port, Nantucket Sound, Massachusetts
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Hyannis Port
Click for Map
Tue -- 02:08 AM EDT     3.63 feet High Tide
Tue -- 05:14 AM EDT     Sunrise
Tue -- 07:30 AM EDT     Moonset
Tue -- 08:08 AM EDT     -0.31 feet Low Tide
Tue -- 02:49 PM EDT     3.15 feet High Tide
Tue -- 08:16 PM EDT     0.10 feet Low Tide
Tue -- 08:17 PM EDT     Sunset
Tue -- 10:25 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.73.33.63.52.91.90.90.1-0.3-0.10.311.72.533.12.82.21.40.60.10.20.71.4

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Tue -- 02:11 AM EDT     -1.80 knots Max Ebb
Tue -- 05:13 AM EDT     Sunrise
Tue -- 05:19 AM EDT     0.00 knots Slack
Tue -- 07:28 AM EDT     Moonset
Tue -- 08:56 AM EDT     2.23 knots Max Flood
Tue -- 12:04 PM EDT     -0.00 knots Slack
Tue -- 02:50 PM EDT     -1.65 knots Max Ebb
Tue -- 05:54 PM EDT     0.00 knots Slack
Tue -- 08:16 PM EDT     Sunset
Tue -- 09:16 PM EDT     1.79 knots Max Flood
Tue -- 10:24 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-1.5-1.8-1.7-1.2-0.30.71.52.12.221.20.1-0.9-1.5-1.6-1.4-0.80.10.91.51.81.71.1

Weather Map
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wmap_A
GEOS 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (4,6,7,8)
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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 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.