Thursday, September23, 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 6:31AMSunset 6:40PM Thursday September 23, 2021 2:13 PM EDT (18:13 UTC) Moonrise 8:08PMMoonset 9:02AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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- 128 Pm Edt Thu Sep 23 2021
.small craft advisory in effect from 8 pm edt this evening through Friday evening...
This afternoon..SE winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. A slight chance of showers.
Tonight..SE winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. A chance of showers. Vsby 1 to 3 nm.
Fri..SE winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. Showers likely. Vsby 1 to 3 nm.
Fri night..S winds 5 to 10 kt, becoming W after midnight. Waves 1 foot or less. Showers likely.
Sat..W winds around 5 kt, becoming S in the afternoon. Waves 1 foot or less. A chance of showers.
Sat night..S winds around 5 kt. Waves 1 foot or less.
Sun through Mon night..W winds 5 to 10 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 128 Pm Edt Thu Sep 23 2021
Synopsis for massachusetts and rhode island coastal waters.. A slow moving cold front approaches new england from the west this afternoon through Friday with scattered showers. Locally heavy rain is possible with isolated Thunderstorms on Friday. Periodic unsettled weather continues over the weekend. A cold front will push over the waters by Saturday evening. Unsettled weather continues early next week with periodic rain chances. 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 231440 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 1040 AM EDT Thu Sep 23 2021

SYNOPSIS. Our area remains in between high pressure to our east, and a slow-moving cold front to our west. For southern New England, this will result in considerable cloudiness and scattered showers. This slow-moving front will bring showers and thunderstorms into western sections late Thursday night, moving eastward across the region during Friday. Showers and thunderstorms then linger over eastern Massachusetts Saturday, otherwise improving weather. More showers possible Sunday and Tuesday. No big warm ups or cool downs are expected.

NEAR TERM /UNTIL 6 PM THIS EVENING/. 1030 am update .

Forecast is largely on track. The main change was to hoist a Rip Current Statement for elevated rip risk across the exposed south-facing beaches today. Live cams at several RI beaches were showing swells from the persistent southeast flow out ahead of a cold front currently stretching from Lake Ontario all the way down the Mid Atlantic coast. Expect on-and-off showers today, but no wash outs expected. Winds will also gradually pick up by this afternoon, gusting up to 20-25 mph at times, which would help with the unseasonably mild and muggy conditions.

Previous Discussion .

Not much change to the overall synoptic pattern today. High pressure over the North Atlantic, and a low pressure over the Great Lakes. As a result, not expecting much change in the forecast outcome. Still looking at a bunch of clouds and scattered showers at times. Light rainfall amounts. Another day of above normal temperatures.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/. A cold front to our west will continue to approach our region tonight into Friday. This front will take quite some time to make its way through southern New England. Thinking this front will still be somewhere over eastern MA and RI late Friday. The main impact will be to provide a focus for stronger showers. Instability is modest, but sufficient to support a few thunderstorms. There is a chance for some stronger than garden- variety thunderstorms, provided there is sufficient shear to maximize the instability present. Still quite a few moving parts, so not yet ready to etch this in stone.

Will also need to monitor rainfall amounts. At this time, thinking we have had sufficiently light rainfall the past few days we could handle a couple of additional inches, as long as it did not fall all at once.

Generally above normal temperatures continue.

LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/. Highlights .

* Drier, less humid air moves in over the weekend into early next week

* Mostly dry on Saturday but a series of disturbances brings periods of unsettled weather through the weekend and into next week

Details .

Friday night and Saturday .

As the parent low lifts into the Hudson Bay its cold front is slow to traverse southern New England, likely only as far east as central MA by Friday evening. It will make its way through by Saturday morning keeping rain in the forecast for eastern MA/RI through at least sunrise Saturday. While instability wanes after sunset enough lingers to support some scattered thunderstorms during the overnight hours.

Saturday much drier and less humid air arrives for much of the region, especially western/central parts of southern New England. However, there is some question as to weather the front stalls around eastern MA which would keep the higher dewpoints and scattered showers around during the day on Saturday. For now keeping a slight chance to a chance of showers in the forecast for eastern MA into Rhode Island with dry weather elsewhere. While the ECMWF continues to be more bullish/wet for Saturday, both the EPS and GEFS ensemble guidance is showing a >50 percent chance of some rain through the day on Saturday. Otherwise expect a good deal of sun in western/Central MA and CT where the column is quite dry save for some moisture at 850 mb allowing for some diurnal clouds.

Sunday .

The latter half of the weekend we'll see another shortwave dip down over New England with a -20C cold pool at 500 mb. This will allow for more clouds and some instability driven showers. 850 mb temps cool a bit from Saturday meaning highs a bit cooler, in the low to mid 70s.

Monday through Wednesday .

For the first half of the week, broad troughing remains over the eastern U.S. with periodic shortwaves rotating through the flow and bringing bouts of rain to the region. While it is difficult to time out the individual shortwaves at this time another period of showers appears likely Tuesday-Wednesday. Temperatures will trend cooler, with highs in the upper 60s and low 70s.

AVIATION /15Z THURSDAY THROUGH MONDAY/. Forecaster Confidence Levels.

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

12Z update .

Today . IFR/MVFR to start the day in low clouds and areas of fog, improving to mainly MVFR. Areas VFR eastern MA. Scattered SHRA.

Tonight . CIGs/VSBYs lower to MVFR/IFR in low clouds and areas of fog. SCT SHRA to start, becoming more numerous overnight with TSRA possible after 10Z BDL-BAF corridor.

Friday . Mix of MVFR/VFR as a cold front crosses the region. Widespread showers and isolated thunderstorms.

KBOS Terminal . High confidence in trends. Moderate confidence in timing.

KBDL Terminal . High confidence in trends. Moderate confidence in timing.

Outlook /Friday Night through Monday/ .

Friday Night: VFR. Chance SHRA, slight chance TSRA.

Saturday: VFR. Slight chance SHRA, slight chance TSRA.

Saturday Night: VFR. Slight chance SHRA.

Sunday through Monday: VFR. Breezy.

MARINE. Forecaster Confidence Levels.

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

1030 AM Update .

* Small Craft Advisories now posted across all the waters.

Southeast winds continue across the waters. Seas continue to build across the southern coastal waters. Small Craft Advisories have now been hoisted across all the waters.

Patchy showers/drizzle and fog possible across the waters during this period. Reduced visibility possible in the fog, but not quite as much within precipitation. Thunderstorms more possible across the coastal waters late tonight into Friday.

Outlook /Friday Night through Monday/ .

Friday Night through Saturday Night: Winds less than 25 kt. Seas up to 5 ft. Chance of rain showers, slight chance of thunderstorms.

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

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

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

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . High Rip Current Risk until 8 PM EDT this evening for MAZ020- 023-024. RI . High Rip Current Risk until 8 PM EDT this evening for RIZ006>008. MARINE . Small Craft Advisory from 2 PM this afternoon to 2 AM EDT Saturday for ANZ231-232. Small Craft Advisory from 2 PM this afternoon to 8 PM EDT Friday for ANZ233>237. Small Craft Advisory from 8 PM this evening to 8 PM EDT Friday for ANZ230. Small Craft Advisory from 8 PM this evening to 8 AM EDT Saturday for ANZ250. Small Craft Advisory from 8 PM this evening to 2 AM EDT Saturday for ANZ251. Small Craft Advisory from 2 PM this afternoon to 8 AM EDT Saturday for ANZ254. Small Craft Advisory until 8 PM EDT Friday for ANZ255-256.

SYNOPSIS . Belk/BW NEAR TERM . Belk/BW/Chai SHORT TERM . Belk LONG TERM . BW AVIATION . Belk/BW MARINE . Belk/BW/Chai


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 8 mi55 min 76°F 1018.2 hPa
44013 - BOSTON 16 NM East of Boston, MA 17 mi33 min SE 14 G 16 65°F1019 hPa
44029 - Buoy A0102 - Mass. Bay/Stellwagen 21 mi129 min SE 12 G 14 67°F 3 ft1018.9 hPa
IOSN3 - Isle of Shoals, NH 40 mi73 min SE 22 G 23 68°F 1018.5 hPa (+0.0)67°F
BGXN3 - Great Bay Reserve, NH 43 mi88 min SE 4.1 79°F 1020 hPa70°F
44073 45 mi189 min 12 G 14 68°F
CMLN3 45 mi189 min NW 8.9 65°F
44098 - Jeffrey's Ledge, NH (160) 48 mi47 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 mi19 minE 610.00 miLight Rain78°F69°F74%1018.3 hPa
Beverly, Beverly Municipal Airport, MA10 mi20 minSE 810.00 miA Few Clouds76°F68°F77%1017.9 hPa
Laurence G Hanscom Field Airport, MA19 mi22 minSSE 810.00 miLight Rain81°F69°F67%1018.7 hPa
Norwood, Norwood Memorial Airport, MA21 mi20 minS 7 G 1510.00 miA Few Clouds82°F68°F63%1017.8 hPa
Lawrence Municipal Airport, MA22 mi19 minVar 610.00 miMostly Cloudy76°F70°F82%1018.8 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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S8S8S8S8S8S7S5SE3SE4CalmCalmS4S53E6E7SE8S11S11SW9
1 day agoE11E9E10E8SE8E7S7SE8SE6S5E4E3SE3E4E4--SE4S6SE4SE4SE7SE9SE9S10
2 days agoE9E10E12E12E11E8SE8SE5SE5S5SE4CalmS3S3CalmCalmCalmN4N3N3E6E7E9E8

Tide / Current Tables for Nahant, Massachusetts
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Nahant
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Thu -- 01:17 AM EDT     9.63 feet High Tide
Thu -- 06:32 AM EDT     Sunrise
Thu -- 07:22 AM EDT     0.24 feet Low Tide
Thu -- 09:02 AM EDT     Moonset
Thu -- 01:34 PM EDT     9.63 feet High Tide
Thu -- 06:38 PM EDT     Sunset
Thu -- 07:44 PM EDT     0.11 feet Low Tide
Thu -- 08:07 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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8.69.69.38.16.13.81.60.30.51.83.868.19.49.58.56.74.52.20.50.21.12.84.9

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
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Thu -- 12:54 AM EDT     -0.00 knots Slack
Thu -- 05:07 AM EDT     -1.24 knots Max Ebb
Thu -- 06:32 AM EDT     Sunrise
Thu -- 07:20 AM EDT     0.00 knots Slack
Thu -- 09:02 AM EDT     Moonset
Thu -- 10:36 AM EDT     1.23 knots Max Flood
Thu -- 01:18 PM EDT     -0.00 knots Slack
Thu -- 05:33 PM EDT     -1.26 knots Max Ebb
Thu -- 06:38 PM EDT     Sunset
Thu -- 07:48 PM EDT     0.00 knots Slack
Thu -- 08:07 PM EDT     Moonrise
Thu -- 11:00 PM EDT     1.12 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.6-0.1-0.5-0.9-1.1-1.2-1.1-0.30.611.21.20.80.2-0.4-0.8-1.1-1.2-1.2-0.70.20.811.1

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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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