Monday, September20, 2021
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Marine Weather and Tides
Nahant, 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 6:28AMSunset 6:46PM Monday September 20, 2021 3:16 PM EDT (19:16 UTC) Moonrise 7:02PMMoonset 5:48AM Illumination 99% Phase: Full Moon; Moon at 14 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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ANZ230 Boston Harbor- 127 Pm Edt Mon Sep 20 2021
This afternoon..E winds 5 to 10 kt. Waves 1 foot or less.
Tonight..SE winds 5 to 10 kt. Waves 1 foot or less.
Tue..SE winds 5 to 10 kt. Waves 1 foot or less.
Tue night..SE winds 5 to 10 kt. Waves 1 foot or less.
Wed..SE winds 5 to 10 kt. Waves around 2 ft.
Wed night..S winds around 10 kt. Waves around 2 ft. A chance of showers.
Thu through Fri..SE winds 5 to 10 kt with gusts up to 20 kt. Waves 2 to 3 ft. A chance of showers.
Fri night..S winds 5 to 10 kt with gusts up to 20 kt. Waves around 2 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 127 Pm Edt Mon Sep 20 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 this 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 Nahant, MA
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location: 42.44, -70.94     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 201735 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 135 PM EDT Mon Sep 20 2021

SYNOPSIS. Large high pressure remains over New England today and Tuesday, bringing dry weather with mild days and cool nights. The high begins to drift offshore Wednesday, with increasing humidity and scattered showers possible. A slow moving frontal system approaching from the west will be accompanied by widespread showers at times Thursday into Friday. Improving conditions expected Saturday but a few showers could linger in eastern Massachusetts and Rhode Island.

NEAR TERM /UNTIL 6 PM THIS EVENING/. 130PM Update .

Near term remains on track. Only deviation were the fair-weather cumulus clouds that have been developing across Connecticut and central Massachusetts.

950AM Update .

No changes made during this update to the forecast.

Temperature just before 10AM are upper-50s/upper-60s. The only minor adjustment made were to nudge the temps up by 1 or 2 degrees as the 50th percentile of the NBM was a tad warmer than current forecast. This will yield temps in the upper-60s to low-70s at the coast and mid-70s across the interior.

Honestly, we are splitting hairs on this "severe clear" kind of day. Speaking of, we do not see much in the way of cloud cover, outside an area of lower broken stratus clouds across the CT River Valley. Morning valley fog across northeastern Mass is diminishing as the sun rises higher and heats up the surface.

Previous forecast discussion is below.

Today .

* Spectacular weather continues, featuring abundant sunshine, low humidity, mild days and cool nights

Subtropical ridge along the east coast amplifies to 593 dam heights at 500 mb over southern New England. Strong subsidence yields a 1030 mb surface high from the Maritimes to New England. This synoptic setup will provide dry weather and abundant sunshine. Temps aloft (+14C at 925 mb and +10C at 850 mb), supports highs very similar to Sunday, low to mid 70s, slightly cooler along/near the coast. Just an absolute gem of a day along with light winds and low humidity (dew pts in the 50s). Enjoy.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM TUESDAY/. 3 AM update .

Tonight .

Deep layer ridge remains over the area with 1030 mb surface high from the Maritimes to New England. Dry airmass, light winds and clear conditions will yield another round of radiational cooling. Thus, we will once again derive lows from the cooler MOS guidance. Another night of temps cooler than normal, with lows in the 40s and 50s. Patchy fog is likely across the valley locations.

Tuesday .

Not much change with deep layer ridge (591 dam heights) and 1030 mb high just offshore, supporting dry weather with cool nights and mild days. No change in airmass so expecting similar highs to Monday, low to mid 70s away from the coastline. Not quite as dry as today, as dew pts rise slightly thru the 50s to near 60 along the south coast, as winds become southeast. This slight increase in low level moisture may yield scattered to broken strato-cu clouds from time to time per model moisture profiles. Nevertheless, very pleasant weather given partial sunshine, mild temps and light winds.

LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/. Highlights .

* Slow moving front brings scattered showers Thu/Fri * Front may slow down and cause showers to linger Sat in east

Models continue to show strong mid level ridge shifting offshore Wed which may bring few showers across interior as moisture is drawn northward. Not expecting much in way of activity since any forcing is weak.

Main time frame for scattered showers looks to be Thu into Fri as slow moving cold front approaches from Great Lakes. Still seeing timing differences among models/ensembles with GFS remaining most progressive and bringing front through Thu, while ECMWF and Canadian are slower and bring it through later Fri or early Sat. Have to think slower solution is more correct given high amplitude upper air pattern with deepening mid level trough over Ohio Valley. Still far enough out in time that we need to consider both options so NBM guidance offers a reasonable compromise.

Looking further ahead to next weekend, it's possible front hangs up over eastern New England which would keep a few showers across eastern MA/RI. We may also see a few showers Sun as upper trough rotates through region, but overall confidence is very low given wide range of model solutions.

AVIATION /18Z MONDAY THROUGH SATURDAY/. Forecaster Confidence Levels.

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

18z TAF Update: High confidence.

VFR conditions. Cumulus clouds continue to developed mainly across Connecticut and central Massachusetts. Some cumulus have started to pop in far eastern Massachusetts along the sea breeze. Winds are east and less than 10 knots for eastern Massachusetts, elsewhere winds are south southeast at less than 10 knots.

Tonight: Mostly VFR. Isolate areas of MVFR due to patchy valley fog for BDL and BAF. Wind becomes calm overnight.

KBOS Terminal . High confidence. VFR.

KBDL Terminal . High confidence. VFR.

Outlook /Tuesday night through Thursday/

Tuesday: VFR.

Tuesday Night: Mainly VFR, with local IFR possible. Slight chance SHRA.

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

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

Thursday: Mainly VFR, with local IFR possible. Breezy. Chance SHRA.

Thursday Night through Friday: VFR. Breezy. Chance SHRA.

MARINE. Forecaster Confidence Levels.

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

3 AM update .

Today/Tonight/Tuesday .

Tranquil boating weather with 1030 mb high stretching from the Maritimes to New England. Light NE winds this morning becoming light east this afternoon and tonight. Then becoming light SE Tue. Dry weather and good vsby thru the period.

Outlook /Tuesday Night through Friday/ .

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

Friday: Winds less than 25 kt. Areas of rough seas. Slight chance of rain showers.

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 . None. RI . None. MARINE . None.

SYNOPSIS . Nocera/JWD NEAR TERM . Nocera/Gaucher/JWD SHORT TERM . Nocera LONG TERM . JWD AVIATION . Gaucher/JWD MARINE . Nocera/JWD CLIMATE . BOX Staff


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 8 mi47 min 69°F 1028.6 hPa
44013 - BOSTON 16 NM East of Boston, MA 17 mi37 min E 5.8 G 7.8 67°F1029.4 hPa
44029 - Buoy A0102 - Mass. Bay/Stellwagen 21 mi73 min ESE 3.9 G 5.8 66°F 3 ft1028.9 hPa
IOSN3 - Isle of Shoals, NH 40 mi77 min SE 7 G 8 64°F 1028.6 hPa (-0.3)50°F
BGXN3 - Great Bay Reserve, NH 43 mi92 min SE 2.9 78°F 1029 hPa63°F
44098 - Jeffrey's Ledge, NH (160) 48 mi51 min 66°F3 ft

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA6 mi23 minE 1010.00 miA Few Clouds71°F53°F53%1028.8 hPa
Beverly, Beverly Municipal Airport, MA10 mi24 minSE 910.00 miFair70°F56°F61%1028.2 hPa
Laurence G Hanscom Field Airport, MA19 mi26 minSSE 510.00 miPartly Cloudy74°F52°F46%1029.1 hPa
Norwood, Norwood Memorial Airport, MA21 mi24 minNE 910.00 miMostly Cloudy74°F57°F56%1028.2 hPa
Lawrence Municipal Airport, MA22 mi23 minSE 610.00 miPartly Cloudy73°F55°F53%1028.9 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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Last 24hrSE7SE7E7E7SE7S4S4S4SW3W3CalmCalmN3N3N4N4N3CalmE4E6E7E7E9E10
1 day agoSE7SE6SE5E3E3CalmCalmNE8
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CalmNW5N8N10N7N8N9N10N10N11N12NE11NE12--E10E10
2 days agoNE8NE9N7N6N5N4N5N6N7NW5N6N4NW6N5N5NE4N5N7N8N5N5N5SE4SE7

Tide / Current Tables for Nahant, Massachusetts
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Nahant
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Mon -- 05:20 AM EDT     -0.22 feet Low Tide
Mon -- 05:48 AM EDT     Moonset
Mon -- 06:29 AM EDT     Sunrise
Mon -- 11:36 AM EDT     9.48 feet High Tide
Mon -- 05:35 PM EDT     0.10 feet Low Tide
Mon -- 06:44 PM EDT     Sunset
Mon -- 07:01 PM EDT     Moonrise
Mon -- 07:54 PM EDT     Full Moon
Mon -- 11:52 PM EDT     10.03 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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9.68.26.13.51.1-0.101.33.35.789.39.48.56.74.420.40.21.33.15.57.99.6

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Mon -- 02:50 AM EDT     -1.39 knots Max Ebb
Mon -- 05:04 AM EDT     0.00 knots Slack
Mon -- 05:48 AM EDT     Moonset
Mon -- 06:29 AM EDT     Sunrise
Mon -- 08:25 AM EDT     1.27 knots Max Flood
Mon -- 11:14 AM EDT     -0.00 knots Slack
Mon -- 03:16 PM EDT     -1.34 knots Max Ebb
Mon -- 05:28 PM EDT     0.00 knots Slack
Mon -- 06:44 PM EDT     Sunset
Mon -- 07:02 PM EDT     Moonrise
Mon -- 07:54 PM EDT     Full Moon
Mon -- 08:46 PM EDT     1.21 knots Max Flood
Mon -- 11:27 PM EDT     -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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-0.6-1-1.3-1.4-1-0.10.711.21.20.70.1-0.4-0.8-1.1-1.3-1.2-0.50.40.91.11.20.90.3

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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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