Monday, October18, 2021
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Marine Weather and Tides
Chelsea, 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 6:59AMSunset 5:58PM Monday October 18, 2021 3:45 PM EDT (19:45 UTC) Moonrise 5:29PMMoonset 4:43AM Illumination 94% 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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ANZ230 Boston Harbor- 307 Pm Edt Mon Oct 18 2021
.small craft advisory in effect from 2 am edt Tuesday through Tuesday evening...
This afternoon..NW winds around 15 kt with gusts up to 20 kt. Waves around 2 ft.
Tonight..NW winds around 15 kt with gusts up to 25 kt. Waves around 2 ft.
Tue..W winds around 15 kt with gusts up to 25 kt. Waves around 2 ft.
Tue night..W winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves around 2 ft.
Wed and Wed night..W winds 5 to 10 kt. Waves around 2 ft.
Thu through Fri 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 306 Pm Edt Mon Oct 18 2021
Synopsis for massachusetts and rhode island coastal waters.. Low pres over the maritimes will bring gusty nw winds through Tue. High pres builds over the mid atlc waters Wed with easing winds, then low pres moves up through the gt lakes Thu. A weak cold front moves into the waters late Fri or Fri night. 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 Chelsea, MA
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location: 42.37, -71.06     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 181926 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 326 PM EDT Mon Oct 18 2021

SYNOPSIS.

Seasonable but blustery conditions continue Tuesday. Unseasonably warm temperatures are on the way for mid-week as a ridge builds in from the west. Mild temperatures persist through Thursday before cold front sets sights on New England, bringing in a chance for showers Friday and much cooler temperatures for the weekend.

NEAR TERM /UNTIL 6 AM TUESDAY MORNING/.

The combination of the short wave feature across upstate NY rotating through our area and the loss of daytime heating, cold pool showers begin to dissipate around sundown. Additionally, a stabilizing boundary layer overnight will cause wind gusts to fall off, with gusts falling to about 10-15 kt from the daytime high of 25-30 kt. Highest winds will remain along the coast.

As a noticeably drier 850mb-500mb airmass begins to rotate in from the west overnight, clouds will also begin to dissipate across the entire region. By sunrise, much of our region will be under mostly clear skies, but cloud cover may linger across the Cape and Islands as the area of moisture is last to pass through this region.

Dewpoints overnight will be mainly in the low to mid 30s, but winds around 10 kt will prohibit temperatures from cooling by optimal radiational cooling conditions. This, combined with cloud cover during the first half of the overnight hours means that temperatures will likely stay 6-8F above forecasted dews, in the upper 30s and low 40s area wide; portions of the Cape look to remain around 50 degrees overnight.

Patchy frost is possible across far northwestern MA overnight, as forecast lows settle around 35 degrees. Should cloud cover clear more quickly than forecast, or winds die back more than expected, frost may be a bit more widespread. Most portions of our CWA should avoid a frost overnight. Climatologically, we are well past the average first frost for our area.

SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/.

Tuesday looks to be a bit of an improvement compared to Monday. As mid level dry air continues to rotate in from the west, cloud cover will be much less widespread. Additionally, warmer air aloft, to the tune of +3-4C at 825 mb compared to Mondays subzero temps, will allow many portions of the area to warm into the low 60s. Of note, the Connecticut River Valley will achieve temperatures about 6-8 degrees above Monday's highs.

The primary weather concern for Tuesday will again be gusty winds, with some guidance pointing towards 40 kt gusts at 825 mb. We do not look to mix as high tomorrow as we did on Monday, to perhaps 875 mb, meaning that the highest gusts would not mix to the surface. However, even an 925 mb, there are 30 kt gusts forecast.

The low pressure system that brought showers to our area on Monday begins to move off to our north and east on Tuesday as a mid level ridge begins to build in from the west. Some residual mid level moisture stalls just to our northeast, so some mid level clouds will likely form, especially across eastern MA.

Overnight, winds once again decouple and gusts become less fierce; W/NW at 5-10 kt. A second surge of moisture will bring dewpoints back into the 40s and low 50s, which combined with light winds will keep temperatures from radiating, lows expected in the low to mid 50s. By daybreak Wednesday, winds flow solidly from the west.

LONG TERM /WEDNESDAY THROUGH MONDAY/. Highlights .

* Warmer temperatures mid-week

* Unsettled weather late week and this weekend with more seasonable temperatures

Wednesday and Thursday

Mid-level ridge axis over the Midwest will gradually build eastward over the east coast between Wednesday and Thursday. This will set southern New England up for unseasonably warm temperatures on both Wednesday and Thursday afternoons. On Wednesday modest WAA in the mid-levels will increase temperatures at 850 hPa to just shy of 10 Celsius. With a modest pressure gradient still in place we should see fairly deep mixing to the 850 hPa level. Thus we should see high temperatures at the surface reach the upper 60s to low 70s for many areas of southern New England.

By Thursday the mid-level ridge axis is forecast to be east of southern New England resulting in a transition from westerly to southwesterly flow. This will support stronger WAA in the low levels with temperatures at 850 hPa climbing to 11-12 Celsius. Therefore we should see slightly warmer temperatures on Thursday afternoon in the low 70s.

Friday through Monday

After another warm Friday afternoon, seasonable temperatures and unsettled weather are forecast for the weekend. There is a fair bit of spread with respect to the development of a coastal low-pressure system and rain chances on Saturday. This will be the forecast problem of the week. Have leaned on NBM in the mean time which reasonably points toward chance/slight chance PoPs for Saturday afternoon. Toward the end of the weekend and early next week, there is a fair bit of agreement in the models for a more robust cold frontal passage that would bring a chance for showers Monday followed by cooler/drier conditions early next week.

AVIATION /19Z MONDAY THROUGH SATURDAY/. Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.

Tonight . High confidence. Showers and mid level ceilings clear out overnight. VFR. NW wind die back to 5-15 kt, gusts to 20 kt possible along the immediate coast.

Tuesday . High confidence. Dry, VFR. NW gusts build again by late morning/early afternoon to 25-30 kt.

KBOS Terminal . High confidence. VFR. Gusty NW winds between 20-25 kt subsiding to 10-15 kt overnight.

KBDL Terminal . High confidence. VFR, ceilings mainly between 4-6k ft. Spotty showers may reduce visibility and ceilings to MVFR conditions for short periods of time through 00Z. W/NW gusts to 20kt subsiding to 10-15 kt overnight.

Outlook /Wednesday through Saturday/ .

Wednesday: VFR. Breezy.

Wednesday Night: VFR.

Thursday: VFR. Breezy.

Thursday Night: Breezy. Slight chance RA.

Friday: Breezy.

Friday Night:

Saturday: Slight chance RA.

MARINE. Forecaster Confidence Levels.

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

Persistent strong NW flow continues into Wednesday morning, with SCA's extended for the southern outer waters through 12 Wednesday. Our eastern and interior waters will fall below SCA criteria late Tuesday. Given that gusts are unlikely to exceed 30 kt on Tuesday, a Gale Watch was not considered.

Outlook /Wednesday through Saturday/ .

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

Wednesday Night: Winds less than 25 kt.

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

Thursday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas.

Friday: Winds less than 25 kt. Local rough seas.

Friday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain.

Saturday: Winds less than 25 kt. Slight chance of rain.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . Small Craft Advisory from 8 PM this evening to 8 AM EDT Wednesday for ANZ232>235-237. Small Craft Advisory from 2 AM to 8 PM EDT Tuesday for ANZ230- 236. Small Craft Advisory from 8 PM this evening to 8 PM EDT Tuesday for ANZ231-251. Small Craft Advisory until 8 PM EDT Tuesday for ANZ250. Small Craft Advisory until 8 AM EDT Wednesday for ANZ254>256.

SYNOPSIS . RM/KS NEAR TERM . KS SHORT TERM . KS LONG TERM . RM AVIATION . RM/KS MARINE . KS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 1 mi46 min 61°F 1005.1 hPa (-0.7)
44013 - BOSTON 16 NM East of Boston, MA 22 mi26 min NW 16G21 62°F1005.8 hPa
44029 - Buoy A0102 - Mass. Bay/Stellwagen 28 mi102 min NW 16G19 56°F 2 ft1004.3 hPa
FOXR1 - 8454000 - Providence, RI 43 mi46 min N 12G18 61°F 64°F1006.4 hPa (-0.7)
PVDR1 44 mi46 min NW 9.9G15 62°F 1006.5 hPa (-0.8)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi46 min WNW 15G20 62°F 1006.2 hPa (-0.8)
FRVM3 - 8447386 - Fall River, MA 46 mi46 min 60°F 66°F1006.9 hPa (-0.7)
FRXM3 47 mi46 min 60°F 52°F
IOSN3 - Isle of Shoals, NH 47 mi46 min WNW 19G21 56°F 1004 hPa (-0.7)34°F
CPTR1 - 8452944 - Conimicut Light, RI 48 mi46 min NNE 14G19 59°F 66°F1005.7 hPa (-0.8)
BGXN3 - Great Bay Reserve, NH 49 mi61 min W 2.9 59°F 1005 hPa43°F

Wind History for Providence, RI
(wind in knots)    EDIT      (on/off)   Help
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G10
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G25

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA2 mi52 minWNW 13 G 2210.00 miPartly Cloudy61°F33°F35%1005.4 hPa
Norwood, Norwood Memorial Airport, MA14 mi53 minNW 910.00 miPartly Cloudy62°F34°F35%1005.5 hPa
Laurence G Hanscom Field Airport, MA14 mi55 minNW 1410.00 miOvercast59°F35°F41%1006.6 hPa
Beverly, Beverly Municipal Airport, MA16 mi53 minWNW 11 G 2010.00 miA Few Clouds60°F37°F42%1004.8 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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Last 24hrNW10W12
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W6W8W11W10
G18
W15W12W10W9W12W10W10W10NW8W14
G18
W13W11
G21
NW11
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W14NW13W13
G22
1 day agoS19
G29
S16S19
G25
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G22
S14S17S12S12NW12W13
G18
W6W7NW6W5--W14
G19
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2 days agoE9E6S11S11S7S7SW10S8SW9S9S9S10S9S10S9S9S13S12S13S15
G21
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G23
SW20
G28
S15
G22

Tide / Current Tables for Charles River Dam, Charles River, Massachusetts
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Charles River Dam
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Mon -- 04:18 AM EDT     0.24 feet Low Tide
Mon -- 04:43 AM EDT     Moonset
Mon -- 07:01 AM EDT     Sunrise
Mon -- 10:37 AM EDT     10.02 feet High Tide
Mon -- 04:39 PM EDT     0.39 feet Low Tide
Mon -- 05:29 PM EDT     Moonrise
Mon -- 05:57 PM EDT     Sunset
Mon -- 10:56 PM EDT     10.15 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Mon -- 01:44 AM EDT     -1.36 knots Max Ebb
Mon -- 03:57 AM EDT     0.00 knots Slack
Mon -- 04:43 AM EDT     Moonset
Mon -- 07:00 AM EDT     Sunrise
Mon -- 07:19 AM EDT     1.21 knots Max Flood
Mon -- 10:17 AM EDT     -0.00 knots Slack
Mon -- 02:10 PM EDT     -1.36 knots Max Ebb
Mon -- 04:23 PM EDT     0.00 knots Slack
Mon -- 05:28 PM EDT     Moonrise
Mon -- 05:56 PM EDT     Sunset
Mon -- 07:42 PM EDT     1.16 knots Max Flood
Mon -- 10:30 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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-0.9
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