Friday, December6, 2019
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Marine Weather and Tides
West Dennis, MA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:51AMSunset 4:12PM Friday December 6, 2019 8:42 PM EST (01:42 UTC) Moonrise 2:31PMMoonset 1:58AM Illumination 76% 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- 716 Pm Est Fri Dec 6 2019
.small craft advisory in effect through Saturday morning...
Tonight..W winds 15 to 20 kt, becoming nw after midnight. Gusts up to 30 kt. Seas 2 to 4 ft. A chance of showers this evening.
Sat..NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft.
Sat night..NW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft.
Sun..W winds around 5 kt, becoming S with gusts up to 20 kt in the afternoon. Seas around 2 ft.
Sun night..S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Mon..S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Showers likely.
Mon night..SW winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Showers.
Tue and Tue night..SW winds 20 to 25 kt, becoming W 15 to 20 kt. Gusts up to 30 kt. Seas 4 to 6 ft. Showers likely.
Wed..NW winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers.
Wed night..NW winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 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 716 Pm Est Fri Dec 6 2019
Synopsis for massachusetts and rhode island coastal waters.. A fast moving low pres system will approach from the west this evening and cross the waters tonight. Large high pres then builds in from the west Sat into Sat night. The high pres system moves off the coast Sun as a slow moving cold front approaches from the west Mon into Tue. The cold front sweeps across the waters Tue night with a secondary cold front moving through Wed afternoon. High pres follows later on Wed through Fri. 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 Dennis, MA
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location: 41.67, -70.18     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 062358 AAA AFDBOX

Area Forecast Discussion . UPDATED National Weather Service Boston/Norton MA 658 PM EST Fri Dec 6 2019

SYNOPSIS. Clouds will increase ahead of a fast-moving clipper system that will push through with periods of light snow this afternoon and early evening. Best chance of seeing light accumulations is along and north of the MA turnpike. The East Slopes of the Berkshires could see upwards of 3 inches. Colder, drier air moves in Friday night with many locations seeing sub-freezing highs on Saturday followed by a frigid Saturday night. The high moves offshore Sunday, starting a return flow of milder and moist air for the first half of the week. This will bring off and on rain for Monday and Tuesday. A cold front moves through Tuesday night, and there might be some back-end snow on Wednesday although confidence is very low at this point. We dry out by late Wednesday and return to colder than normal temperatures for early December on Thursday.

NEAR TERM /THROUGH SATURDAY/. 430PM Update .

Snow forecast is largely on track with a quick-hitting clipper system with coating to 2 inches along and north of the MA Turnpike. Temperatures are in the low 30s north of the MA turnpike. South of the turnpike, temperatures range from mid 30s away from the coast to mid 40s along the south coast. This is on track with the forecast for light accumulating snow north of the turnpike and a coating at best south due to above freezing temperatures resulting in a rain/snow mix or just plain rain. There is another area of snow in Central NY that is moving towards us but all the snow should wind down from west to east by 7-8pm. High res guidance have hinted at wrap around moisture for northeast MA, including Essex and northern Middlesex counties. So have indicated the potential for up to 2 inches of snow in this area. Also would not be surprised to see reports of 3 inches of snow for the highest elevations in Franklin county,MA when it is all said and done.

SHORT TERM /SATURDAY NIGHT/. After snow and rain showers exit, winds slowly but steadily decrease as a surface high moves in and the gradient relaxes. With this we also see post frontal NW winds begin to bring in much colder air. Initially, the winds could limit the effect of radiational cooling from clear skies. But thinking there could be window of couple of hours just before sunrise when the atmosphere decouples enough. Combined with a deep snowpack across much of the interior, lows could dip into the low to mid teens across the higher elevations and low 20s elsewhere. Mid 20s to low 30s near the coast.

Saturday colder and drier air funnels into the region as high pressure builds in, though cyclonic flow lingers aloft. Subsidence under this high will keep things dry and skies mostly clear. Diurnal cumulus should develop given a cyclonic flow set up with cold air advection and daytime heating. Much of the area would see sub-freezing highs, with the interior higher elevations only reaching the upper 20s. Low to mid 30s near the coast. Albedo effect from snow cover would also negate daytime heating. Tomorrow evening, a combination of light winds and mostly clear skies should see temperatures drop even more quickly than the previous night. A few locations in the interior higher elevations could even see single digit lows. Elsewhere, widespread teens are expected and 20s on the coast.

LONG TERM /SUNDAY THROUGH FRIDAY/. Highlights .

Cold start to Sunday before temperatures rebound during the day.

Rain spreads in early next week with temperatures trending upward. Potential for strong winds on Monday and Tuesday especially across eastern MA.

Temperatures trending downward on Wednesday and Thursday. Possibility of snow as precipitation is ending on Wednesday.

Daily Concerns .

Sunday .

Cyclonic flow initially with a mid level ridge building over the eastern Great Lakes. A trough will lift off to the northeast and the ridge will slide in over New England. This will bring clear skies and very light winds with the high overhead. Still have high confidence in strong radiational cooling. Knocked down temperatures toward the 25th percentile of guidance. Held off from the 10th percentile because it seemed too cold along the coastline given there may be some clouds exiting. Nudged down temperatures a bit further in the typical cold spots. Overnight lows range from the single digits above zero across the Berkshires and I-495 west corridor to the mid 20s across Cape Cod.

The ridge axis shifts off to the east on Sunday which shifts flow aloft to a southwesterly direction and advects warm air into the region. This will trend temperatures upward during the day. Expect partly to mostly sunny skies with highs ranging from the low 30s across northwest MA to the low 40s along the coast. High confidence in the forecast during this period.

Monday and Tuesday .

Pattern change underway with zonal flow shifting to a more amplified flow. Models have come into agreement with a northern and southern stream trough digging in from the west. The weaker southern stream trough will dig into the desert southwest on Monday while the northern trough digs into the Northern Plains and western Great Lakes. As the trough digs into the western Great Lakes several shortwaves will ripple along the central and eastern Great Lakes. This will provide lift along with a warm front and spread rain into the region. Still seeing a strong 40 to 70 kt low level jet develop. This continues through Tuesday with the low level jet shifting to the east. The GFS and ECMWF have come into good agreement, but still uncertain how much of these winds will translate to the surface. Did bump up speeds and gusts with gale force gusts anticipated across the coastal waters late on Monday into early Tuesday. If we tap more into the low level jet speeds then winds will need to be increased further. There will also be some instability present and suspect that there will be a few rumbles of thunder, but confidence in particular timing and placement is low at this time. It will be much warmer with high temperatures in the 50s on Monday and Tuesday. Suspect that there will be some 60 degree readings on Tuesday. Could see a good slug of precipitation with GEFS QPF still quite spread out with amounts between 0.75 to 3.0 inches when it is all said and done. Will be worth keeping an eye on for future updates. Low to moderate confidence in the forecast for this time frame.

Wednesday and Thursday .

Precipitation coming to an end on Wednesday. Overall there is pretty good agreement amongst guidance synoptically, but the ECWMF holds onto heavier precipitation longer than the GEM and GFS. If the ECMWF holds true there could be some snowfall accumulation, but confidence at this point in time is very low. Do have high confidence in the colder air moving in as the trough lifts to the northeast. Temperatures will be trending downward with readings in the low 30s across the west on Wednesday and in the low to mid 40s across the coast and east. Temperatures will be colder on Thursday with highs ranging from the mid 20s across the Berkshires and Worcester Hills to the low 30s along the coast. Moderate confidence in the cooler temperatures, but low confidence in weather expected on Wednesday.

AVIATION /00Z SATURDAY THROUGH WEDNESDAY/. Forecaster Confidence Levels .

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

Short Term /through Saturday Night/ . High confidence.

Tonight . Precipitation coming to an end as low pressure exits. It will take a bit for ceilings to improve to VFR as some MVFR/IFR clouds linger. Should see things start to scatter out across eastern and central MA between 02Z and 06Z. Things are already clearing out across the CT River Valley. Once skies clear expect VFR conditions through the rest of the TAF. Gusty winds will continue across the Cape and Islands. Think that the pressure gradient will relax enough to end gusty winds at BOS around 12Z.

Saturday . VFR. Light NW winds.

KBOS Terminal . High confidence in TAF. Moderate confidence in the gusty winds between 04Z to 12Z.

KBDL Terminal . High confidence in TAF.

Outlook /Sunday through Wednesday/ .

Sunday: VFR. Breezy.

Sunday Night: Mainly VFR, with local MVFR possible. Windy with local gusts up to 30 kt. Slight chance SHRA.

Monday: Mainly MVFR, with areas IFR possible. Windy with local gusts up to 30 kt. SHRA likely.

Monday Night: Mainly MVFR, with areas IFR possible. Windy with gusts up to 35 kt. SHRA.

Tuesday: MVFR. Windy with gusts up to 30 kt. SHRA likely.

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

Wednesday: Mainly VFR, with areas MVFR possible. Breezy. Slight chance SHRA.

MARINE. Short Term /through Saturday Night/ . High confidence.

Tonight . Periods of snow through early evening with vsby lowering to 1 mile or less in snow. Seas 3-4 ft. After 02z, the snow pushes offshore with clearing skies. Gusty NW winds 25-35 kts decreasing through the night. Seas 8-10 ft on southern waters.

Saturday . Clear skies and light winds. Seas 3-5 ft.

Outlook /Sunday through Wednesday/ .

Sunday: Winds less than 25 kt.

Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Seas up to 5 ft. Slight chance of rain showers.

Monday: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Local rough seas. Rain showers likely.

Monday Night: Strong winds with gusts up to 35 kt. Rough seas up to 13 ft. Rain showers likely.

Tuesday: Strong winds with gusts up to 30 kt. Rough seas up to 13 ft. Rain showers likely.

Tuesday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 11 ft. Rain showers likely.

Wednesday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 10 ft. Chance of rain showers.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . Small Craft Advisory until 11 AM EST Saturday for ANZ231>235- 237-250-251. Small Craft Advisory until 4 AM EST Saturday for ANZ230. Small Craft Advisory until midnight EST tonight for ANZ236. Small Craft Advisory until noon EST Saturday for ANZ254. Gale Warning until 1 AM EST Saturday for ANZ255-256.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 13 mi43 min 21 G 27 42°F1012.9 hPa (-1.4)
44090 14 mi43 min 46°F2 ft
WAXM3 - Waquoit Bay Reserve, MA 19 mi118 min S 5.1 52°F 1013 hPa46°F
NTKM3 - 8449130 - Nantucket Island, MA 27 mi55 min SW 8.9 G 17 48°F 41°F1013.5 hPa
BZBM3 - 8447930 - Woods Hole, MA 28 mi61 min 49°F 42°F1013.1 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 37 mi53 min SE 1.9 G 1.9 42°F 1 ft1012.5 hPa (-2.0)36°F
BUZM3 - Buzzards Bay, MA 49 mi43 min W 28 G 33 49°F 1013.4 hPa (+0.4)

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA5 mi1.8 hrsSW 19 G 2610.00 miLight Rain and Breezy48°F39°F74%1012.2 hPa
Chatham, Chatham Municipal Airport, MA10 mi51 minVar 6 G 1510.00 miLight Rain46°F43°F89%1013.2 hPa
Otis Air National Guard Base, MA18 mi58 minWSW 17 G 2310.00 miOvercast46°F42°F87%1012.9 hPa
Provincetown Municipal Airport, MA24 mi47 minW 910.00 miLight Rain43°F39°F89%1012.7 hPa

Link to 5 minute data for KHYA

Wind History from HYA (wind in knots)
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1 day agoCalmW4W5NW3W3CalmCalmW3W3W3W3W6W6W7
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Tide / Current Tables for South Yarmouth, Bass River, Nantucket Sound, Massachusetts
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South Yarmouth
Click for Map
Fri -- 12:58 AM EST     Moonset
Fri -- 02:03 AM EST     0.33 feet Low Tide
Fri -- 06:52 AM EST     Sunrise
Fri -- 08:28 AM EST     2.67 feet High Tide
Fri -- 01:31 PM EST     Moonrise
Fri -- 02:32 PM EST     0.44 feet Low Tide
Fri -- 04:10 PM EST     Sunset
Fri -- 08:47 PM EST     2.61 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.50.30.50.81.21.82.32.62.62.41.91.40.90.50.50.71.11.62.12.52.62.42

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Fri -- 12:57 AM EST     Moonset
Fri -- 01:53 AM EST     1.91 knots Max Flood
Fri -- 04:53 AM EST     -0.00 knots Slack
Fri -- 06:51 AM EST     Sunrise
Fri -- 07:44 AM EST     -1.58 knots Max Ebb
Fri -- 10:52 AM EST     0.00 knots Slack
Fri -- 01:30 PM EST     Moonrise
Fri -- 02:24 PM EST     1.79 knots Max Flood
Fri -- 04:09 PM EST     Sunset
Fri -- 05:17 PM EST     -0.00 knots Slack
Fri -- 08:03 PM EST     -1.49 knots Max Ebb
Fri -- 11:05 PM EST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.41.81.91.60.9-0.1-1-1.5-1.6-1.3-0.70.10.91.51.81.71.20.3-0.7-1.3-1.5-1.3-0.9-0.1

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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Wind Forecast for Boston, MA (20,4,5,8)
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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 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.