Sunday, January26, 2020
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Marine Weather and Tides
Nantucket, 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 6:57AMSunset 4:49PM Sunday January 26, 2020 3:05 PM EST (20:05 UTC) Moonrise 9:15AMMoonset 7:35PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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 Pm Est Sun Jan 26 2020
.small craft advisory in effect through Monday evening...
This afternoon..W winds around 15 kt with gusts up to 25 kt. Seas 5 to 7 ft.
Tonight..W winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 7 ft.
Mon..W winds 10 to 15 kt with gusts up to 25 kt. Seas 5 to 7 ft.
Mon night..NW winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 7 ft.
Tue..NW winds 5 to 10 kt. Seas 3 to 5 ft.
Tue night..NW winds 5 to 10 kt. Seas 2 to 4 ft.
Wed through Thu night..N winds 10 to 15 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 116 Pm Est Sun Jan 26 2020
Synopsis for massachusetts and rhode island coastal waters.. Low pres will move into the maritimes Mon and Tue. High pres builds over eastern canada Wed, then into northern new eng Thu. 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 Nantucket, MA
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location: 41.27, -70.06     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 261803 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 103 PM EST Sun Jan 26 2020

SYNOPSIS. Dry weather is expected through the end of the upcoming week with mild temperatures today and Monday, then more seasonable the rest of the week. There is the potential for a storm to impact the region sometime next weekend, but that is far from a certainty at this point.

NEAR TERM /UNTIL 6 PM THIS EVENING/. 1253 PM Update:

Stratocu continues to fill back in across western/central MA, with radar indicating isolated to widely scattered showers across the CT Valley. Did increase PoPs a bit more over the next couple hrs but not likley to be a washout and these should diminish as they move further east into central MA into north- central CT. Otherwise, a pretty pleasant afternoon with some west breezes (gusts to 25 mph in the interior). No changes to highs ranging in the 40s, mildest furthest east.

Previous Discussion .

Some lingering stratus below subsidence inversion is possible just after daybreak, but trend will be for decreasing clouds and partly to mostly sunny skies as cold advection and dry westerly flow becomes established. More cloud cover however is anticipated across the interior high terrain as shortwave energy rotates around mid level low which lifts northward through northern NY. Isolated snow showers may spill into the Berkshires, but main focus for snow showers activity will be in northern New Eng and northern NY under the cold pool aloft. Airmass not all that cold today with 850 mb temps around -5C. With partial sunshine, highs should reach mid/upper 40s in the coastal plain, with upper 30s to lower 40s over the higher terrain. West winds will occasionally gust to 20 mph.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM MONDAY/. Tonight .

SNE will be in between shortwaves tonight as next impulse approaches from the NW. Dry weather expected in much of SNE. However, scattered upslope snow showers are expected along the western slopes of the Berkshires and a few snow showers may spill into the east slopes. Expect increasing mid clouds during the night from west to east as deeper moisture moves in from the west. Lows will range from the upper 20s to lower 30s with a modest SW/W breeze.

Monday .

Weak shortwave moves through the region but with continued dry westerly flow not expecting any precip other than a few upslope snow showers in the Berkshires. Cross sections show a fair amount of low/mid level moisture which will translate to bkn cu/ac cloud cover. This will be most prevalent in the higher terrain where mostly cloudy skies anticipated, but ptsunny elsewhere. Slight cooling in the low levels with 850 mb temps -6/-7C. Expect highs ranging from upper 30s higher terrain to mid 40s coastal plain with occasional wind gusts to 20 mph.

LONG TERM /MONDAY NIGHT THROUGH SATURDAY/. Highlights .

* Another generally dry work week with slightly above normal temps

* Potential storm next weekend, but uncertainty is high

Details .

Tuesday through Friday .

Another quiet week ahead to end out this rather uneventful January. Looking at the synoptic scale we see a transition from marginal troughing and cyclonic flow at the mid levels Tuesday to ridging and cyclonic flow by Thursday/Friday. A few weak shortwaves will rotate around the trough Tue/Wed with dry cold frontal passages that shouldn't bring any precip to speak of, only a steady drop in temps through Thursday. The only exception would be some ocean effect rain/snow showers on Cape Cod Tuesday/Tuesday night. The biggest temperature decrease will be felt from Monday to Tuesday, with temps dropping from the upper 40s Monday to upper 30s Tuesday. Thursday is the coldest day of the week before a warm up Friday into the 40s as the ridge axis moves east and milder southwest flow returns.

Next Weekend .

Still a high degree of uncertainty with next weekend's potential storm system; both with regard to 1) if a storm will impact southern New England and 2) the timing of said potential storm and rain vs snow impacts. Guidance continues to indicate potential for northern and southern stream disturbances to phase and bring a high impact winter storm Saturday or Sunday, but it is not a given at this point. Deterministic guidance, while useful to indicate potential for some kind of storm in the vicinity of the east coast, continues to flip flop which is 0% surprising at the 7-8 day time range. Ensemble spread indicates potential for anything from a rainy inside runner to heavy snow to a fish storm that misses us to the south. Details on next weekend will come into better focus the further removed we get from this weekend. Stay tuned!

AVIATION /18Z SUNDAY THROUGH FRIDAY/. Forecaster Confidence Levels .

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

18Z TAF Update:

Short Term . High confidence.

Rest of Today:

VFR, with SCT-BKN diurnal stratocu filling back in through the afternoon. May see some MVFR bases associated with scattered showers at BAF and in the Berkshires but should be temporary. W winds 8-14 kt, gusts up to 22 kt.

Tonight:

VFR with sct-bkn clouds AOA 6kft, but patchy MVFR and isold -shsn possible over Berkshires. W winds 8-12 kt.

Monday:

SCT-OVC VFR ceilings with bases AOA 4-5kft. Scattered flurries or sprinkles in the interior late-AM to mid-aftn associated with the passage of a disturbance aloft. W winds around 7-10 kt (occasional gusts to 20 kt), with a slight veer to WNW/NW late in the day west of BOS/PVD.

Monday Night:

VFR with clearing skies. W to NW winds 8-12 kt.

KBOS Terminal . High confidence in TAF.

KBDL Terminal . High confidence in TAF.

Outlook /Monday Night through Thursday/ .

Monday Night: VFR. Breezy.

Tuesday through Thursday: VFR.

MARINE. Short Term /through Monday/ . High confidence.

Low pres in the Maritimes will result in a persistent west flow with occasional gusts 20-25 kt through the period. Small craft advisories will remain in effect through Mon for the outer waters.

Outlook /Monday Night through Thursday/ .

Monday Night: Winds less than 25 kt. Seas up to 5 ft.

Tuesday: Winds less than 25 kt. Seas up to 5 ft. Slight chance of rain.

Tuesday Night: Winds less than 25 kt. Areas of seas approaching 5 ft.

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

Wednesday Night through Thursday: Winds less than 25 kt. Areas of seas approaching 5 ft.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . Small Craft Advisory until 7 PM EST Monday for ANZ235-237-250- 254>256. Small Craft Advisory until 1 PM EST Monday for ANZ251.

SYNOPSIS . KJC/BW NEAR TERM . KJC/Loconto/BW SHORT TERM . KJC LONG TERM . BW AVIATION . KJC/Loconto/BW MARINE . KJC/Loconto/BW


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NTKM3 - 8449130 - Nantucket Island, MA 2 mi47 min WSW 9.9 G 18 44°F 39°F1005.3 hPa
44020 - NANTUCKET SOUND 19 mi65 min 12 G 16
WAXM3 - Waquoit Bay Reserve, MA 33 mi80 min S 4.1 46°F 1005 hPa38°F
BZBM3 - 8447930 - Woods Hole, MA 37 mi65 min 42°F 39°F1005 hPa (-1.5)
44090 42 mi35 min 40°F2 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 mi72 minWSW 1510.00 miFair46°F37°F71%1005.2 hPa

Link to 5 minute data for KACK

Wind History from ACK (wind in knots)
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SE19SE16SE18SE17SE15W12W8SW9SW9W10W11
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1 day agoNE7NE5NE6E6E6E7E6E7E5NE7NE9E8E12E13E12
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2 days agoW5S5S5S7SW8SW8SW4SW3S3S3CalmCalmCalmCalmCalmCalmCalmCalmSE4S3S5S53S6

Tide / Current Tables for Nantucket, Nantucket Island, Massachusetts (2)
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Nantucket
Click for Map
Sun -- 01:12 AM EST     2.70 feet High Tide
Sun -- 06:30 AM EST     0.37 feet Low Tide
Sun -- 06:57 AM EST     Sunrise
Sun -- 08:14 AM EST     Moonrise
Sun -- 01:09 PM EST     3.53 feet High Tide
Sun -- 04:48 PM EST     Sunset
Sun -- 06:35 PM EST     Moonset
Sun -- 07:18 PM EST     0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.52.72.62.21.60.90.40.40.81.52.12.73.33.53.42.92.21.30.400.10.511.6

Tide / Current Tables for Nantucket Harbor Entrance Channel, Massachusetts Current
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Nantucket Harbor Entrance Channel
Click for Map
Sun -- 01:50 AM EST     -0.00 knots Slack
Sun -- 04:54 AM EST     -1.57 knots Max Ebb
Sun -- 06:57 AM EST     Sunrise
Sun -- 07:15 AM EST     0.00 knots Slack
Sun -- 08:14 AM EST     Moonrise
Sun -- 08:57 AM EST     0.84 knots Max Flood
Sun -- 01:18 PM EST     -0.00 knots Slack
Sun -- 04:48 PM EST     Sunset
Sun -- 05:11 PM EST     -1.57 knots Max Ebb
Sun -- 06:35 PM EST     Moonset
Sun -- 07:28 PM EST     0.00 knots Slack
Sun -- 09:23 PM EST     1.10 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.3-0.1-0.7-1.3-1.6-1.2-0.20.60.80.60.30.10-0.2-0.6-1.2-1.6-1.3-0.50.51.110.7

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (15,3,4,5)
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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.