Saturday, January18, 2020
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Marine Weather and Tides
Quincy, 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 7:07AMSunset 4:41PM Saturday January 18, 2020 1:58 AM EST (06:58 UTC) Moonrise 1:54AMMoonset 12:57PM Illumination 44% Phase: Third Quarter Moon; Moon at 23 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- 116 Am Est Sat Jan 18 2020
Rest of tonight..NW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft.
Sat..NW winds 5 to 10 kt, becoming S in the afternoon. Waves 1 foot or less. Snow likely.
Sat night..S winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft. Snow with rain likely. Vsby 1 nm or less.
Sun..W winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft.
Sun night through Mon night..NW winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft.
Tue through Wed 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 116 Am Est Sat Jan 18 2020
Synopsis for massachusetts and rhode island coastal waters.. High pres builds in from the west tonight. Low pres will then track across the great lakes on Sat. This low will then track across northern new england Sat night into Sun morning before moving into the canadian maritimes by Sun afternoon. A cold front will cross the waters Sun night followed by high pres slowly building in from the west through the middle of next week. 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 Quincy, MA
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location: 42.27, -70.96     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 180559 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 1259 AM EST Sat Jan 18 2020

SYNOPSIS. Large cold high pressure settles over New England tonight with winds diminishing. Low pressure moves across the Great Lakes and brings accumulating snow late Saturday afternoon into Saturday night. A cold front crosses the region Sunday with perhaps a few brief snow showers late Sunday/Sun night. Dry, but very cold weather follows Monday through Wednesday as large high pressure builds in from the west. This high pressure system moves east of the region by next Thursday and Friday allowing for temperatures to moderate along with dry weather likely persisting.

NEAR TERM /UNTIL 6 AM THIS MORNING/. 10 PM Update:

Exceedingly dry air in place over interior Southern New England with dewpoints in the -7 to -10F range north and west of I-95. This bone-dry air also is also prevalent at depth with 00z ALB/GYX RAOBs reflecting PWAT values of 0.04-0.05". Enough lingering NW winds for temps running a bit milder/outpacing forecast values a few degrees. Essentially just blended in slightly milder guidance to existing values to bring readings closer in line through about 2 AM. Winds should slacken and radiate even more efficiently by that point. High clouds will fill in towards early overnight in the Berks/CT Valley and pre- dawn hrs into eastern MA and RI, though these clouds probably aren't thick enough to preclude strong radiational cooling. Nonetheless a cold night in store, with easing winds as we move deeper into the overnight. No changes to lows attm.

Previous discussion .

Dry high pressure settles over Southern New England, allowing for clear skies for much of the night, and diminishing winds. Gusts of 20- 30 mph linger along the shoreline communities thru early this evening, especially across the Cape and Islands. Then light winds will allow for very good radiational cooling, especially away from the shoreline where light/near calm winds are expected. For overnight lows went with a blend of the colder MOS guidance and bias- corrected guidance. Overnight lows range from -6 below zero to 10 above zero for much of the area, except some lows in the teens for communities along the shoreline.

Expecting some high deck clouds to move into the area late tonight, with partly cloudy skies around daybreak Sat.

SHORT TERM /6 AM THIS MORNING THROUGH 6 PM SUNDAY/. Saturday and Saturday Night .

During Saturday morning expecting dry conditions with increasing mid and high deck cloud cover. Surface high pressure centered overhead moves quickly offshore.

In its place a quick hitting low pressure system moves through the Great Lakes Region, with an increase in southerly flow as a warm front approaches from the SW. This warm frontal feature will lift across our area into Saturday evening, bringing a period of accumulating snows to our area. Main low pressure center passes thru northern New England Saturday night, with limited deepening of mid level trough in the process. During late Sat/Sat evening there is also some divergence aloft, being in left front quad of upper jet. This is also models also show a southwest low-level jet associated with warm advection aloft, that will likely sweep an axis of 925-700 mb frontogenetic forcing NE thru the area.

Hi-res models and NAM/GFS in general agreement on limited QPF over SNE prior to 18Z, and most of the SNE QPF falling between 21Z Sat and 06Z Sun. The air mass preceding the warm front is expected to be plenty cold enough at the surface (bolstered by wet-bulb cooling once precipitation starts) to support all-snow as an initial precip type.

There is the continued potential for heavy snowfall to fall at rates of an inch per hour, especially across the northern tier of MA and the east slopes of the Berkshires. For this area we have issued a Winter Storm Warning, with snowfall of 4 to 8 inches. Across south central MA, east coastal MA, north central/NE CT and the northern half of RI, have issued a Winter Weather Advisory for 2 to 5 inches of snow. There could be a brief period of 1" per hour snowfall rates in these areas during Saturday evening. For south coastal MA/RI and the Cape/Islands, snowfall should range from 1"-3", so at this time do not have winter weather headlines for that area. A transition to a rain/snow mix or light rain is expected during the overnight, along eastern and southern portions of the region. The far interior should remain cold enough for all snow.

During the overnight a dryslot comes in aloft, which should result in rain or snow becoming more intermittent. There is a slight chance for patchy freezing drizzle, at this time not confident enough to place with headlines.

High temps on Saturday are mainly 20 to 30 degrees, except 30s along the south coastal communities including Cape/Islands.

Overnight lows Saturday night- only fall a few degrees, ranging from the upper teens to 20s across much of the region, to low to mid 30s along the south coastal communities. Temps should actually rise a few degrees before daybreak Sunday.

LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/. Highlights .

* A cold front crosses the region late Sun with a reinforcing surge of cold, blustery airmass arriving Sunday night

* Dry but very cold Monday and Tuesday

* Temps moderate approaching 40 Thu and then possibly into the 40s Fri along with mainly dry weather persisting

Details .

Sunday .

Low pressure along the Maine coast in the morning will exit into the Maritimes during the afternoon, yielding dry WNW flow on the backside into southern New England supporting mainly dry but blustery weather. Should see at least breaks of sunshine especially down in the coastal plain with more clouds in the high terrain given upslope and possibly some lake effect clouds from western NY. Model soundings suggest WNW winds may gust up to 30 mph. Temps will climb into the upper 30s and lower 40s Sunday afternoon, which is 5-10 degs above normal but the blustery WNW winds will make it feel colder than that.

Trailing short wave trough moves across the region Sunday evening with attending cold front that will usher in a reinforcing surge of cold air Sunday night. Robust short wave may be accompanied by some snow showers especially with some low level moisture with dew pts in the 20s, a little above normal (teens). However westerly blyr winds ahead of the front will limit low level convergence and downslope winds may dry out the blyr too much to support much snow shower activity.

Monday through Wednesday .

Cold airmass invades the area behind departing northern stream short wave Sunday night. GFS showing its cold bias here so leaned toward the EC/ECENS with 850 temps from -10C to -12C Mon and Tue. Very blustery thru Mon so expecting cold wind chills. Highs likely not getting out of the 20s Monday and Tuesday, so definitely colder than normal and Mon will feel colder given the blustery northwest winds. Not as cold by Wed as cold air advection should become neutral by then. Temps may still be below average with highs in the upper 20s to lower 30s but with ensembles having 1030+ mb high cresting over SNE, winds should diminish along with wind chills easing. Dry weather prevails this period with the only exception as previous forecaster mentioned possibly some ocean effect snow showers Tue as winds may have some northerly component.

Thursday and Friday .

ECENS showing western-central CONUS trough resulting in downstream ridging along the east coast. Thus temps continue to moderate Thu and Fri along with light winds as high pres remains over or near the region. Not that blyr mixing will extend up to 850 mb but ECENS has 850 mb temps warming to 0C to +2C. However this should be good enough for highs to climb slightly above normal Thu with highs in the upper 30s and lower 40s and possibly into the 40s Fri.

AVIATION /06Z SATURDAY THROUGH WEDNESDAY/. Forecaster Confidence Levels .

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

06Z TAF Update:

Rest of the Overnight (thru 12z):

VFR. SCT-OVC high clouds overspread towards daybreak. Winds to trend light NW.

Saturday: High confidence thru 18z, moderate thereafter.

VFR through about 18z with lowering ceilings. Deteriorating conditions from W-E toward MVFR-IFR as leading bands of snow overspread the TAFs. After 22z, most areas are IFR to LIFR. Steadiest snow begins earliest at BAF/BDL and closer to 23-00z eastern MA, PVD and the Cape. Winds become S/SE around 4-7 kt.

Saturday Night: Moderate confidence.

IFR/LIFR in areas of snow, especially during the evening. Periods of VLIFR heavy snow possible with snowfall rates up to 1"/hr between 00-03z, though highest confidence of that N/W of ORH-BED. After 06Z gradually improving conditions from SW to NE as the more steady snow move NE of our area. Precip may end as a period of drizzle or freezing drizzle, though the snowpack should soak up freezing drizzle with little to no impact from very light icing. S winds become SW 4-8 kt. LLWS possible.

Sunday: High confidence.

Generally improving conditions toward MVFR-VFR, possible RA/SN still lingering in northern MA. Mainly VFR by afternoon. Winds become W-WNW and increase to 10-15 kt with gusts between 20-30 kt (highest ACK and Cape terminals).

KBOS Terminal . High confidence in TAF.

KBDL Terminal . High confidence in TAF.

Outlook /Sunday Night through Wednesday/ .

Sunday: Mainly VFR, with local MVFR possible. Windy with local gusts up to 30 kt.

Sunday Night through Tuesday: VFR. Breezy.

Tuesday Night through Wednesday: VFR.

MARINE. Tonight: As offshore low moves further NE of our area, winds and seas continue to diminish. Based on obs, have cancelled Gale Warnings for eastern coastal waters and replaced them with SCAs. So SCAs are now in effect for much of tonight for all coastal waters.

Saturday: By daybreak, most waters near the coast will have dropped below SCA criteria. SCA headlines may be needed for eastern outer waters, primarily for lingering seas up to 5 feet till the early afternoon hours.

Saturday night: SCA headlines for winds/seas likely needed as an area of low pressure approaches our region from the W. SSE winds increasing with gusts 25 to 30 kt, seas building to 5 to 8 feet. Slight chance for gale force gusts on the southern outer waters prior to daybreak Sunday.

Outlook /Sunday Night through Wednesday/ .

Sunday: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas.

Sunday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 11 ft.

Martin Luther King Jr Day: Winds less than 25 kt. Local rough seas.

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

Tuesday Night: Winds less than 25 kt. Seas up to 5 ft. Slight chance of snow showers. Local visibility 1 to 3 nm.

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

BOX WATCHES/WARNINGS/ADVISORIES. CT . Winter Weather Advisory from 2 PM this afternoon to 4 AM EST Sunday for CTZ002>004. MA . Winter Weather Advisory from 4 PM this afternoon to 4 AM EST Sunday for MAZ007-013>019. Winter Weather Advisory from 2 PM this afternoon to 4 AM EST Sunday for MAZ011-012. Winter Storm Warning from 2 PM this afternoon to 7 AM EST Sunday for MAZ002>004-008>010-026. Winter Storm Warning from 4 PM this afternoon to 7 AM EST Sunday for MAZ005-006. RI . Winter Weather Advisory from 4 PM this afternoon to 4 AM EST Sunday for RIZ001>004. MARINE . Small Craft Advisory until 1 AM EST early this morning for ANZ233>235. Small Craft Advisory until 5 AM EST early this morning for ANZ231-232-251. Small Craft Advisory until 2 PM EST this afternoon for ANZ250- 254-255. Small Craft Advisory until 3 AM EST early this morning for ANZ256.

SYNOPSIS . Nocera/NMB NEAR TERM . Loconto/Chai/NMB SHORT TERM . NMB LONG TERM . Nocera AVIATION . Loconto MARINE . Nocera/Loconto/Chai/NMB


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 8 mi64 min 14°F 40°F1035.2 hPa
44013 - BOSTON 16 NM East of Boston, MA 17 mi68 min NNW 16 G 19 17°F 44°F4 ft1035 hPa (-0.3)7°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 27 mi114 min NNW 18 G 21 15°F 42°F5 ft1034.8 hPa
FOXR1 - 8454000 - Providence, RI 40 mi64 min N 8 G 11 16°F 40°F1036.5 hPa
PVDR1 40 mi64 min NNW 4.1 G 8 15°F 1036.5 hPa-4°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 41 mi64 min N 5.1 G 7 17°F 1036.3 hPa
FRVM3 - 8447386 - Fall River, MA 41 mi64 min 15°F 41°F1036.4 hPa
FRXM3 41 mi64 min 16°F -2°F
CPTR1 - 8452944 - Conimicut Light, RI 43 mi64 min NNW 13 G 17 17°F 39°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 44 mi68 min NW 16 G 19 19°F 6 ft1035.1 hPa (+0.3)10°F
44090 45 mi58 min 41°F4 ft
NAXR1 - Narragansett Bay Reserve, RI 48 mi73 min N 6 15°F 1036 hPa-3°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 48 mi64 min N 7 G 11 16°F 1036.7 hPa
PRUR1 49 mi64 min 16°F -6°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA8 mi64 minNW 10 G 1710.00 miA Few Clouds15°F-6°F38%1036.1 hPa
Marshfield Airport, MA19 mi63 minNW 6 G 1210.00 miFair14°F0°F52%1035.6 hPa
Laurence G Hanscom Field Airport, MA22 mi67 minNW 1110.00 miFair12°F-7°F42%1037.9 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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1 day agoCalmS5S6S4SE7SE10E8SE8SW4W18
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2 days agoS4S7SW7SW8SW7W7W13
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W9W7W9W7W5W8CalmSW6SW4NW3Calm

Tide / Current Tables for Nut Island, Massachusetts
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Nut Island
Click for Map
Sat -- 12:54 AM EST     Moonrise
Sat -- 05:19 AM EST     9.93 feet High Tide
Sat -- 07:08 AM EST     Sunrise
Sat -- 11:33 AM EST     0.10 feet Low Tide
Sat -- 11:57 AM EST     Moonset
Sat -- 04:39 PM EST     Sunset
Sat -- 05:50 PM EST     9.04 feet High Tide
Sat -- 11:53 PM EST     0.24 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.72.44.66.98.89.99.78.46.44.11.90.30.21.335.17.18.698.36.84.82.60.8

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Sat -- 12:54 AM EST     Moonrise
Sat -- 01:51 AM EST     1.05 knots Max Flood
Sat -- 04:44 AM EST     -0.00 knots Slack
Sat -- 07:09 AM EST     Sunrise
Sat -- 09:20 AM EST     -1.08 knots Max Ebb
Sat -- 11:28 AM EST     0.00 knots Slack
Sat -- 11:57 AM EST     Moonset
Sat -- 02:42 PM EST     0.97 knots Max Flood
Sat -- 04:39 PM EST     Sunset
Sat -- 05:15 PM EST     -0.00 knots Slack
Sat -- 09:48 PM EST     -1.01 knots Max Ebb
Sat -- 11:50 PM EST     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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0.811.10.90.5-0.1-0.5-0.8-1-1.1-1-0.40.40.90.910.70.1-0.3-0.6-0.8-1-1-0.7

Weather Map
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GEOS Local Image of Northeast    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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Wind Forecast for Boston, MA (1,6,7,8)
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Ground Weather Radar Station Boston, MA
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Disclaimer:
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.