Sunday, September19, 2021
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Marine Weather and Tides
Nantucket, MA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:24AMSunset 6:44PM Sunday September 19, 2021 9:50 PM EDT (01:50 UTC) Moonrise 6:33PMMoonset 4:38AM Illumination 98% 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- 727 Pm Edt Sun Sep 19 2021
Tonight..NE winds 10 to 15 kt. Gusts up to 20 kt this evening. Seas 3 to 5 ft.
Mon..E winds 10 to 15 kt. Seas 2 to 3 ft.
Mon night..E winds 10 to 15 kt. Seas 2 to 4 ft.
Tue..E winds around 10 kt. Seas 2 to 3 ft.
Tue night and Wed..SE winds 10 to 15 kt. Seas 2 to 4 ft.
Wed night..SE winds around 15 kt with gusts up to 20 kt. Seas 3 to 5 ft.
Thu..SE winds around 15 kt with gusts up to 20 kt. Seas 4 to 6 ft.
Thu night..SE winds 10 to 15 kt with gusts up to 20 kt. Seas 5 to 6 ft. A chance of showers.
Fri and Fri night..S winds 5 to 10 kt with gusts up to 20 kt. Seas 4 to 6 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 727 Pm Edt Sun Sep 19 2021
Synopsis for massachusetts and rhode island coastal waters.. High pressure remains anchored from the maritimes to new england through mid week, providing tranquil boating conditions. By late next week, a cold front approaches new england from the west, and will be accompanied by scattered showers, with locally heavy rain possible and isolated Thunderstorms. 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 192321 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 721 PM EDT Sun Sep 19 2021

SYNOPSIS. Large high pressure builds into the region today and overnight. This will bring dry weather with mild days and cool nights through mid week. A slow moving frontal system approaching from the west will be accompanied by showers at times Thursday into Friday. Improving conditions expected Saturday but a few showers could linger in eastern New England.

NEAR TERM /UNTIL 6 AM MONDAY MORNING/. 720 PM update .

High pressure builds over the region tonight with clear skies and light winds. Conditions will be ripe for excellent radiational cooling so leaned heavily on colder MOS guidance to derive overnight lows in the mid 40s to low 50s, except for mid 50s in the urban centers and immediate coast. Might be a good idea to close the windows!

SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/. Monday .

Anomalous 592 Dm high builds into New England and becomes centered over our area. This is 99.5th percentile according to the NAEFS Situational Awareness Table. Nonetheless, daytime highs should be near or just above climatological normal due to southeast winds as 1028mb surface high slides just offshore. With 925mb temperatures +12 to +14C, expect low 70s near the coast and mid to upper 70s in the interior locations. Due to subsidence inversion, expect plentiful sunshine with a few mid to high level clouds filtering in from the southwest during the afternoon hours. That is associated with weak disturbances associated with the remnants of Tropical Cyclone Nicholas getting caught in the weakness between the 592 Dm ridge centered over the Northeast US and an approaching amplifying H5 trough from the Great Plains.

An interesting statistic is that Boston has never failed to record a sub-70 degree high past September 20. The latest first sub-70 degree high heading into astronomical fall is September 20 1947. With southeast flow and SSTs in the mid 60s, it will be a close call whether Boston will officially hit 70 degrees, given that the climate site is just off the waters at Logan Airport. Have gone with a maximum forecast of 70 degrees, but it is a toss-up between 69 and 71F. We shall see if the record stands by the end of tomorrow!

Monday night .

Surface high slides further offshore, allowing winds to turn southerly. Dew points rise from the 40s into the 50s and along with increasing cloud cover, overnight lows will generally bottom out in the 50s, with mid to upper 50s near the coast and in the urban population centers. If cloud cover is less extensive, then upper 40s in the typical cool spots like the MA coastal plains are possible.

LONG TERM /TUESDAY THROUGH SUNDAY/. Highlights .

* Mainly dry and seasonably mild Tue/Wed * Scattered showers at times Thu into Fri and continued mild * Improving conditions Sat, but showers may linger in the east

Tuesday into Wednesday .

Strong mid level ridge over New Eng shifts to east on Wed while surface high remains sets up east of Nova Scotia with ridging extending west into SNE. Dry and seasonably mild weather Tue with sunshine mixing with some lower strato-cu as persistent SE flow brings a shallow layer of low level moisture. Then Wed, some of the guidance is indicating a few showers developing in the interior as low level moisture deepens a bit. Given that large scale forcing is limited with ridging nearby and lots of dry air in the mid levels, much of the day should be dry with just a low risk for a few showers in the interior. Temps Wed will be a bit milder with highs mid/upper 70s

Thursday into Friday .

Models are similar in the overall pattern with high amplitude trough/mid level low across the Gt Lakes opening up and lifting to the NE into eastern Canada as strong ridge persists to the east. As a result of the amplified pattern, there is consensus of a slow moving front approaching from the west with deep southerly flow across New Eng. Shower chances will increase during this period. Expect scattered showers Thu, especially in the west but given that best forcing remains to the west with neutral to slightly rising heights not expecting widespread showers and it may remain mostly dry in eastern New Eng Thu. The most likely period for numerous showers and a few t-storms will be Fri as low level jet and accompanying PWAT plume moves into region ahead of the frontal system. While some heavier rainfall is possible, the axis of heaviest rainfall is expected to be north and west of SNE. Temps will be in the 70s Thu/Fri with humid conditions as dewpoints will be well into the 60s.

Saturday and Sunday .

Low confidence forecast next weekend as there are differences on the amplitude of the upstream trough across the Gt Lakes which impacts the timing of the front moving offshore. GFS and ECMWF suggest improving conditions Sat, but many EC ensemble members have showers lingering on Sat with front stalling near eastern New Eng. Will maintain chc pops in the east on Sat but lots of uncertainty. For Sunday, we went with dry forecast in NW flow, but can't rule out more showers assocd with a shortwave passage. Seasonable temps expected next weekend as there is not push of colder air. In fact, ensemble mean 850 mb temps 10-12C.

AVIATION /23Z SUNDAY THROUGH FRIDAY/. Forecaster Confidence Levels.

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

00z Update .

Tonight . VFR. Winds light and variable.

Monday . VFR with light and variable winds, becoming southeast at 5-10 kt near the coast.

Monday night . VFR to start but MVFR or localized IFR conditions may develop overnight in typical interior fog-prone terminals. Winds light and variable except for southeast winds 5-10 kt for Cape terminals.

KBOS Terminal . High confidence. VFR.

KBDL Terminal . High confidence. VFR.

Outlook /Monday night through Thursday/

Tuesday: VFR.

Tuesday Night: Mainly VFR, with local IFR possible.

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

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

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

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

MARINE. Forecaster Confidence Levels.

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

340 PM update .

Rest of today . High forecast confidence.

High pressure builds into New England, with NNE winds 10-15 kt and isolated 20 kt gusts diminishing by this evening. 5-7 ft seas and SE swells from Odette will diminish after midnight. Remaining Small Craft Advisories are scheduled to come down after midnight.

Tonight and Monday . High forecast confidence.

Large 1025+ mb high pressure builds over the maritimes, yielding fine boating weather with light winds, dry weather and good vsby.

Monday night . Winds shift to the south at 5-10 kt with localized reduced vsby due to patchy fog possible.

Outlook /Tuesday through Friday/ .

Tuesday: Winds less than 25 kt.

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

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

Wednesday Night through Thursday: Winds less than 25 kt. Seas up to 5 ft. Slight chance of rain showers.

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

Friday: Winds less than 25 kt. Rough seas up to 7 ft. Chance of rain showers, isolated thunderstorms.

CLIMATE. The latest first sub-70 degree high heading into astronomical fall for BOS is September 20 1947. It is possible we may break the record by tomorrow.

The latest first sub-70 degree high heading into astronomical fall for PVD is September 26 2015.

Both BDL and ORH have already recorded sub-70 degree highs earlier this month.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . High Rip Current Risk until 10 PM EDT this evening for MAZ007- 019-022-024. RI . None. MARINE . Small Craft Advisory until 10 PM EDT this evening for ANZ250. Small Craft Advisory until 1 AM EDT Monday for ANZ254.

SYNOPSIS . KJC/Chai NEAR TERM . KJC/Chai SHORT TERM . Chai LONG TERM . KJC AVIATION . KJC/Chai MARINE . KJC/Chai CLIMATE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NTKM3 - 8449130 - Nantucket Island, MA 2 mi50 min NE 7 G 8.9 65°F 73°F1023.1 hPa (+2.1)
44020 - NANTUCKET SOUND 19 mi30 min NNE 12 G 14 67°F 72°F1023 hPa
CHTM3 29 mi50 min NE 8 G 9.9 64°F 69°F1023 hPa (+2.2)
WAXM3 - Waquoit Bay Reserve, MA 33 mi65 min Calm 63°F 1023 hPa59°F
BZBM3 - 8447930 - Woods Hole, MA 37 mi50 min 63°F 72°F1023 hPa (+2.1)
44090 42 mi84 min 68°F2 ft

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Nantucket, Nantucket Memorial Airport, MA1 mi57 minNNE 610.00 miFair57°F50°F78%1022.8 hPa

Link to 5 minute data for KACK

Wind History from ACK (wind in knots)
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1 day agoE7E9NE8NE7NE8N8NE12NE10N11N12NE13N14NE13N12N14N15
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2 days agoNE8NE8NE10E8E8E8E8NE9NE9E9E10
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Tide / Current Tables for Nantucket, Nantucket Island, Massachusetts (2)
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Nantucket
Click for Map
Sun -- 04:38 AM EDT     Moonset
Sun -- 05:16 AM EDT     0.10 feet Low Tide
Sun -- 06:25 AM EDT     Sunrise
Sun -- 11:55 AM EDT     3.21 feet High Tide
Sun -- 05:24 PM EDT     0.27 feet Low Tide
Sun -- 06:33 PM EDT     Moonrise
Sun -- 06:42 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.73.22.41.40.50.10.20.61.21.92.63.13.232.41.60.80.30.40.81.42.22.93.5

Tide / Current Tables for Nantucket Harbor Entrance Channel, Massachusetts Current
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Nantucket Harbor Entrance Channel
Click for Map
Sun -- 03:06 AM EDT     -1.63 knots Max Ebb
Sun -- 04:38 AM EDT     Moonset
Sun -- 05:29 AM EDT     0.00 knots Slack
Sun -- 06:25 AM EDT     Sunrise
Sun -- 07:22 AM EDT     0.91 knots Max Flood
Sun -- 12:39 PM EDT     -0.00 knots Slack
Sun -- 03:35 PM EDT     -1.66 knots Max Ebb
Sun -- 06:03 PM EDT     0.00 knots Slack
Sun -- 06:33 PM EDT     Moonrise
Sun -- 06:42 PM EDT     Sunset
Sun -- 07:45 PM EDT     0.76 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0-0.6-1.3-1.6-1.3-0.50.40.90.80.70.60.50.3-0.2-0.9-1.5-1.6-1-00.60.70.60.40.4

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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