Saturday, November28, 2020
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Marine Weather and Tides
Nantucket, MA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:44AMSunset 4:13PM Saturday November 28, 2020 2:09 AM EST (07:09 UTC) Moonrise 4:26PMMoonset 5:50AM Illumination 96% Phase: Waxing Gibbous; Moon at 13 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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ANZ255 Coastal Waters Extending Out To 25 Nm South Of Marthas Vineyard And Nantucket- 116 Am Est Sat Nov 28 2020
Rest of tonight..NW winds 5 to 10 kt. Seas 3 to 4 ft. A slight chance of showers.
Sat..NW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 3 to 4 ft.
Sat night..NW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft.
Sun..W winds around 10 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Sun night..SW winds around 10 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft.
Mon..SE winds 15 to 20 kt with gusts up to 25 kt, increasing to 20 to 25 kt with gusts up to 35 kt in the afternoon. Seas 4 to 7 ft. A chance of showers. Vsby 1 to 3 nm.
Mon night..S winds 25 to 30 kt, diminishing to 20 to 25 kt after midnight. Gusts up to 40 kt. Seas 9 to 12 ft. Showers likely. Vsby 1 to 3 nm.
Tue and Tue night..SW winds 15 to 20 kt with gusts up to 30 kt. Seas 8 to 11 ft. A chance of showers. Vsby 1 to 3 nm.
Wed..W winds 15 to 20 kt with gusts up to 25 kt. Seas 7 to 10 ft.
Wed night..W winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 9 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 116 Am Est Sat Nov 28 2020
Synopsis for massachusetts and rhode island coastal waters.. Spotty showers are possible tonight. Otherwise, high pressure brings dry weather through the weekend. Strong low pressure moves across the northeast usa Monday and Tuesday, bringing the risk of strong southerly gales and high seas along with heavy rain. Mariners will want to stay tuned to the forecast. Dry weather returns on Wednesday. For additional information on possible hazardous weather for the week ahead, please visit www.weather.gov/boston/ehwo.


7 Day Forecast for Marine Location Near Nantucket, MA
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location: 41.27, -70.06     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 280551 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 1251 AM EST Sat Nov 28 2020

SYNOPSIS.

High pressure will bring mainly dry and quiet weather through Sunday. Strong low pressure lifts through New York State Monday. This will bring the potential for strong winds and heavy rain. Above normal temperatures early in the week trend seasonably cold midweek, then above normal again late week.

NEAR TERM /UNTIL 6 AM THIS MORNING/.

1250 AM Update .

While most of the region was dry very early this morning, there were a few brief passing sprinkles still showing up on radar. This activity will be ending shortly as shortwave departs with mainly just trace amounts. Otherwise, expect a fair amount of strato-cu to persist through daybreak given ample low level moisture. We do expect at least a few brief breaks although the extent of those remains uncertain. Low temps should bottom out in the 35 to 45 degree range by daybreak. Coolest readings should be across interior MA, especially if we can see enough breaks develop in the strato-cu. We also expect some patchy fog in the typical spots, but not nearly as widespread/dense as yesterday.

SHORT TERM /6 AM THIS MORNING THROUGH 6 PM SUNDAY/.

Colder air continues to move across our region. Still looking at one more mid level shortwave to pass us by with the cold pool aloft. The humidity associated with this feature is limited, so just expecting mainly clouds. Trend in the guidance has been for less of a risk for showers, but it will not be zero. Expecting clearing to develop during the afternoon into the evening behind this shortwave. This clearing continues into Saturday night. High pressure becomes more of a factor Saturday night.

Above normal temperatures continue Saturday. how much above normal will depend upon how quickly the clouds break up. Thinking max temperatures about 5 degrees lower than today. Low temperatures Sunday morning should be near normal as colder air continues to overspread our region.

LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/.

Big Picture .

Upper flow starts with separate northern and southern jet streams going into the weekend. Shortwaves, one in each stream, merge over the Mississippi Valley Sunday night and Monday. This creates a closed low over the Midwest Monday that ejects through NY into Canada Tuesday and Wednesday.

Upper contours are above normal values over the weekend and on Monday, then crash below normal Tuesday and Wednesday as the upper low passes to our west. Contours then build to normal Thursday and Friday. This suggests above normal temps early with a below normal period during midweek, then a return to normal late week.

Mass fields and thermal fields are similar among the models through midweek, then greatly diverge next Thursday and Friday. Forecast confidence is good through midweek, then turns poor late next week.

Details .

Sunday and Monday .

High pressure over the Eastern USA Sunday morning moves offshore by evening. This maintains subsidence over New England Sunday and resulting mostly sunny, fair weather. Warm advection aloft will limit the depth of mixing Sunday. Temperatures at 950-mb support max sfc temps in the upper 40s and lower 50s. If mixing reaches to 925- mb, max temps would climb into the 50s.

Fair skies Sunday night, although expect increasing mid/high clouds especially late at night. With dew points in the 30s, expect min temps before the arrival of clouds will be in the 30s.

Southern stream shortwave directly supports a surface low over LA/MS, and the digging northern stream shortwave will turn the Eastern USA flow from the southwest and eventually from the south. This will draw the weather system and its moisture up the Appalachians and over the Northeast USA. This pulls the surface low up through PA/NY with a broad south flow over Srn New England. The south flow draws higher than normal PW values . 1 inch to 1.3 inches . into our area for Monday, suggesting wet weather with occasional downpours. Increasing surface pressure gradient supports increasing wind on Monday with sustained winds 25-35 mph. Low level jet reaches 60-70 kt at 2000 feet above the surface, which suggests potential wind gusts reaching 40-45 kt especially along the coastal plain. Will continue with the rainy/windy forecast for Monday. With 950-mb temps around 10C, forecast has max sfc temps in the 50s, possibly low 60s in a few spots.

Tuesday-Wednesday .

Surface cold front sweeps east of Srn New England by Tuesday morning. The passage of the upper flow will bring cold advection aloft Tuesday, destabilizing the airmass and generating scattered showers. Cold advection extends to the surface Wednesday with mixing to 850-mb . that will only support max sfc temps in the 40s. Mixing will draw southwest gusts of 30 kt to the surface.

Thursday-Friday .

Upper trough pulls out through Eastern Canada. Global models show another trough sweeping east from the Plains, but with differences on its evolution. Offshore high pressure will provide dry weather Thursday and much of Friday, but with increasing potential of precipitation during Friday night.

AVIATION /06Z SATURDAY THROUGH WEDNESDAY/.

Forecaster Confidence Levels .

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

Today . High Confidence. Some very localized patchy ground fog possible until around 12z Otherwise. a broken deck of strato- cu will dominate today but with VFR conditions. A brief spot shower or two is possible this afternoon, but mainly dry weather is on tap. WNW winds of 5 to 15 knots.

Tonight . High Confidence. VFR with light winds.

Sunday . High Confidence. VFR with WSW winds of 5 to 8 knots.

KBOS . High confidence in TAF.

KBDL . High confidence in TAF.

Outlook /Sunday Night through Wednesday/ .

Sunday Night: Mainly VFR, with local MVFR possible. Chance SHRA.

Monday: Mainly MVFR, with local IFR possible. Strong winds with local gusts up to 40 kt. SHRA.

Monday Night: Mainly MVFR, with areas IFR possible. Strong winds with gusts up to 40 kt. SHRA.

Tuesday: Mainly MVFR, with areas VFR possible. Windy with local gusts up to 35 kt. Slight chance SHRA.

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

Wednesday: Breezy.

MARINE. Winds will briefly diminish tonight into Saturday, before picking up again late Saturday and Saturday night as colder air moves over the waters. Thinking gusts up to 20 kt, with seas approaching 5 ft across the outer coastal waters during that time. Later shifts may consider Small Craft Advisories if winds are forecast to be stronger.

Small Craft Advisories should be able to expire later this afternoon across the southern outer coastal waters, where rough seas continue to subside into this evening.

Outlook /Sunday Night through Wednesday/ .

Sunday: Winds less than 25 kt. Seas locally approaching 5 ft.

Sunday Night: Winds less than 25 kt.

Monday: Low risk for gale force winds with gusts up to 40 kt. Local rough seas. Rain showers.

Monday Night: Moderate risk for gale force winds with local gusts up to 45 kt. Rough seas up to 16 ft. Rain showers.

Tuesday: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 12 ft. Chance of rain showers.

Tuesday Night: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 13 ft. Chance of rain showers.

Wednesday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 11 ft. Slight chance of rain showers.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . None.

SYNOPSIS . WTB/Belk NEAR TERM . Frank SHORT TERM . Belk LONG TERM . WTB AVIATION . Frank/WTB MARINE . WTB/Belk


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NTKM3 - 8449130 - Nantucket Island, MA 2 mi51 min NNW 4.1 G 4.1 50°F 50°F1013.5 hPa
44020 - NANTUCKET SOUND 19 mi39 min N 3.9 G 5.8 51°F
CHTM3 29 mi51 min NW 1.9 G 5.1 50°F 50°F1013.5 hPa
WAXM3 - Waquoit Bay Reserve, MA 33 mi84 min WNW 1.9 50°F 1014 hPa48°F
BZBM3 - 8447930 - Woods Hole, MA 37 mi51 min 49°F 51°F1013.4 hPa
44090 42 mi42 min 51°F1 ft

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Nantucket, Nantucket Memorial Airport, MA1 mi76 minN 310.00 miOvercast51°F48°F92%1013.4 hPa

Link to 5 minute data for KACK

Wind History from ACK (wind in knots)
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Last 24hrW4W5CalmNW4CalmCalmW3NW5NW4W4SW7W6SW4CalmCalmCalmCalmCalmCalmCalmN4NW7N3N7
1 day agoSE6SE7SE7S8S8S10S12S14S13S15S15S14S16S13S14S13SW12W10W10W9W9W6W4W7
2 days agoE5E5SE6SE9SE12SE11SE14SE15SE15SE18SE14S11S12S11S11S13S11S12SW8SW7SW6S6S6S4

Tide / Current Tables for Nantucket, Nantucket Island, Massachusetts (2)
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Nantucket
Click for Map
Sat -- 04:04 AM EST     0.69 feet Low Tide
Sat -- 04:50 AM EST     Moonset
Sat -- 06:44 AM EST     Sunrise
Sat -- 10:33 AM EST     3.47 feet High Tide
Sat -- 03:26 PM EST     Moonrise
Sat -- 04:12 PM EST     Sunset
Sat -- 04:50 PM EST     0.28 feet Low Tide
Sat -- 11:15 PM EST     2.78 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.62.11.50.90.70.91.31.92.533.43.43.12.61.810.40.30.50.91.522.52.8

Tide / Current Tables for Nantucket Harbor Entrance Channel, Massachusetts Current
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Nantucket Harbor Entrance Channel
Click for Map
Sat -- 02:20 AM EST     -1.58 knots Max Ebb
Sat -- 04:40 AM EST     0.00 knots Slack
Sat -- 04:50 AM EST     Moonset
Sat -- 06:27 AM EST     0.89 knots Max Flood
Sat -- 06:44 AM EST     Sunrise
Sat -- 11:18 AM EST     -0.00 knots Slack
Sat -- 02:41 PM EST     -1.63 knots Max Ebb
Sat -- 03:26 PM EST     Moonrise
Sat -- 04:12 PM EST     Sunset
Sat -- 05:03 PM EST     0.00 knots Slack
Sat -- 06:52 PM EST     0.97 knots Max Flood
Sat -- 11:53 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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-0.4-1.1-1.5-1.4-0.70.30.80.80.50.30.20.1-0.3-0.9-1.5-1.6-1-00.710.70.50.30.2

Weather Map
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wmap_A
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
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.