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 9:40 AM EST (14:40 UTC) Moonrise 1:54AMMoonset 12:57PM Illumination 41% 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- 716 Am Est Sat Jan 18 2020
Today..NW winds 5 to 10 kt, becoming S this afternoon. Waves 1 foot or less. A chance of snow this afternoon with vsby 1 to 3 nm.
Tonight..S winds 15 to 20 kt, becoming sw 10 to 15 kt after midnight. Waves around 2 ft. Patchy fog. Snow with a chance of showers. Vsby 1 nm or less.
Sun..W winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft.
Sun night..NW winds 10 to 15 kt with gusts up to 30 kt. Waves around 2 ft.
Mon and Mon night..NW winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft.
Tue through Wed night..SW winds 5 to 10 kt with gusts up to 25 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 716 Am Est Sat Jan 18 2020
Synopsis for massachusetts and rhode island coastal waters.. High pres will shift east early today. Low pres will then move across the waters tonight bringing a mix of rain and snow. SEcondary low pres develops over the gulf of maine Sun. 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 181208 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 708 AM EST Sat Jan 18 2020

SYNOPSIS.

A fast moving low pressure system will bring several inches of snow to the region late this afternoon and evening. A cold front crosses the region Sunday with much colder air returning Sunday night. Dry, but very cold weather follows Monday through Wednesday as large high pressure builds in from the west. This high pressure system moves south of the region by next Thursday and Friday allowing for above normal temperatures to return with dry weather persisting.

NEAR TERM /THROUGH TONIGHT/.

705 AM Update .

Previous forecast remains on track. No changes.

1040 mb anticyclone remains established across interior New England, associated with an exceedingly dry air mass through a large depth of atmosphere (dewpoints in the negative single digits, PWAT values of 0.04-0.05"). Current temperatures were running in the upper single digits to mid teens early this morning. Infrared satellite reveals a large shield of overcast high clouds advancing in on W mid-level flow of around 40-45 kt per regional radar wind profiler data. These clouds will only lower and thicken through the day today. With the in-situ cold and dry air mass in place, these clouds will likely significantly dampen the prospect for much warming today areawide (except perhaps SE Mass and the Cape early today). This is an important consideration - namely, how much can temperatures moderate preceding the warm-frontal precipitation band for late in the day, with an expectation of evaporational cooling at precip onset that will only force temps a few degrees cooler. Look for increasing/thickening clouds today, and am not as optimistic on much warming today with high temperatures recovering only in the upper teens to mid 20s N/W of I-95 into northern CT, and mid/upper 20s to near 30 for much of RI into the South Coast, Cape and the Islands. This will set the stage for the accumulating snowfall event to affect the region later this afternoon.

==================================================

The forecast for the winter storm coming our way on the whole was left little changed. Snow amounts were generally increased for most locations, but not by much. The expected colder start in terms of temps should result in a longer duration of accumulating snowfall; in fact the 00z HREF supports these indications with a slower south to north changeover than earlier runs. With that said, there are several competing/limiting factors working against greater snow totals than indicated (essentially this is a 3-8" accumulation event, falling over a 6-12 hr window of time). The first is the progressive nature to the snow. The lack of optimal snow microphysics (other than high-res mesoscale models, I'm hard pressed to find much more than 10 microbars of lift in the snow growth region) supports mainly half to an inch-per-hr snow rates is another limitation. The greatest upward change was across southern coastal RI, the rest of the South Coast on into Barnstable County, with indication of a band of heavier snow early tonight that has the potential to push snow totals closer to lower end Advisory levels. That was also the only change regarding headlines, which was to add Washington, southern parts of Bristol and Plymouth into Barnstable Counties into a Winter Weather Advisory.

No significant change in terms of timing, with steady snow beginning toward mid-afternoon across the CT Valley into Hartford and Tolland Counties, and closer to late-afternoon/dinnertime across much of RI, and the remainder of MA. Given the cold temperatures/pavement, initial snow should have no trouble sticking as soon as it falls. The period of heaviest snow occurs between roughly 6 PM to midnight, with robust 850-700 mb frontogenetic forcing progressing bands of moderate to at times heavy snowfall northeastward in this period. HREF probs of 1"/hr snowfall are greatest across areas north of the Mass Pike and especially across northern MA, but up to inch per hour snowfall rates could occur for a time as well across northern CT into the Worcester/Springfield area, and towards Cape Cod and SE MA coast before changing to rain. After a likely initial period of wet- bulb cooling once snow begins, southerly winds will draw warmer temperatures northward and force snow to change to rain along the south coast of RI into the Cape around late-evening/midnight. These warmer temps should support a change from snow to rain/snow mix across I-95 into the Boston area shortly after midnight. How far north above-freezing temperatures can advance before steadiest precipitation comes to an end is still somewhat uncertain and could result in some further (small) changes to accumulations near or south of the Mass Pike to include northern CT into central/northern RI. This is especially a challenge for Hartford County, where higher- res temps indicate southern portions of the county may rise above freezing but areas north of Hartford (towards Windsor Locks to the MA border) may struggle to warm above freezing with colder air being tough to modify/dislodge. Have the highest confidence in temperatures supporting all snow for the longest duration across the Berkshires eastward into north-central/northeast MA.

After midnight, a NE-moving dry slot moves in from southern NY that will end the threat for steadier precip. There may still be some light, intermittent precip around into the pre-dawn hrs, and soundings for the overnight in southwest interior MA into CT and RI indicate an unsaturated ice crystal layer supporting a period of either drizzle freezing drizzle where temperatures are below freezing. Were freezing drizzle to transpire, fortunately any impact is pretty much nil as any associated very light icing would be falling on top of a snowpack instead of exposed pavement.

Snow amounts range from 6-8" across northwest MA into the Berkshires, and 4-8" for northern MA counties bordering NH. A general 2-4 inch snowfall is anticipated for the South Coast up to the I-95/Boston to Providence corridor. A general 3-5 inches, potentially as much as 6" in spots across northeast Essex County MA through southern Worcester County into northern CT and northern Providence County is indicated. Will have to watch this latter area closely for any further changes.

SHORT TERM /SUNDAY/.

Secondary surface low forms into coastal ME, with an inverted trough trailing back into northern New England. This leaves our area into a W to WNW gradient flow. Overcast skies early should give way to partly cloudy conditions by the afternoon, with west downsloping winds pushing high temperatures in the mid 30s to lower 40s. 850 mb front then progresses eastward for the afternoon, which will help to produce falling temperatures into the upper 20s to mid 30s by sunset and promote blustery WNW wind gusts 25-30 mph across the region.

LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/.

Highlights .

* Turning much colder Sun night

* Dry but very cold Mon/Tue with some improvement by Wed afternoon

* Above normal temps return Thu & esp Fri as dry weather continues

Details .

Sunday night .

Much colder weather is ushered back into the region Sunday night on blustery northwest winds. Low temps by daybreak will be down into the teens to near 20 in the strong cold advection pattern. Dry weather persists, but mid level trough axis with some ocean moisture may allow for a few snow showers to develop toward daybreak across portions of the Cape. However, this should not be a big deal.

Monday and Tuesday .

Upper level trough over the northeast will result in very cold/below normal temperatures Mon and Tue, but with dry weather. High temperatures both days will mainly be in the 20s. Low temps Mon night and Tue night should generally range from between 5 and 15 above. In fact, a few of the normally coldest locations in western MA may drop below zero late Tue night/early Wed with high pressure building into the region. This high building in from the west will also result in continued dry weather.

Wednesday .

After a very cold start early Wednesday morning, temperatures will begin to moderate on Wednesday. Many locations should see afternoon highs rebound back into the 30s. High pressure overhead will result in plenty of sunshine and light winds too, so certainly an improvement from the very cold temps expected early Wed morning.

Thursday and Friday .

GEFS/EPS guidance continue to be in very good agreement in showing upper level trough departing and some upper level ridging building into the Northeast. The result will be temps moderating to above normal levels. Highs on Thu should reach the 40s in many locations and perhaps around 50 in some locations by Fri. A ridge of high pressure will also result in dry weather persisting for the remainder of the work week.

AVIATION /12Z SATURDAY THROUGH WEDNESDAY/. Forecaster Confidence Levels .

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

12Z TAF Update:

Today: High confidence thru 19z, moderate thereafter.

VFR through about 19z. Deteriorating conditions from W-E toward to IFR-LIFR conditions as leading band of snow overspread the TAF sites. Steadiest snow begins earliest at BAF/BDL around 21z or 22z and between 23-00z eastern MA, PVD and the Cape. Winds become S/SE around 4-7 kt. Moderate to even briefly heavy snow anticipated.

Tonight: Moderate confidence.

IFR/LIFR in areas of snow, especially during the evening. Periods of LIFR 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 and trends, moderate on timing.

KBDL Terminal . High confidence in TAF and trends, moderate on timing.

Outlook /Sunday Night through Wednesday/ .

Sunday Night through Tuesday: VFR. Breezy.

Tuesday Night through Wednesday: VFR.

MARINE.

Small craft advisories in effect for all open waters tonight and Sunday.

Today: Light NW winds become south and increase to 10-15 kt with gusts to 20 kt. Seas 2-4 ft.

Tonight: SSE winds increasing with gusts 25 to 30 kt, seas building to 5 to 8 feet. Snow showers change to rain with visibilities 1-3 miles.

Sunday: W/WNW winds with gusts 25 to 30 kt. Low prob of gale force gusts over the waters south of Nantucket. Seas 6-10 ft southern waters, 4-6 ft eastern offshore waters.

Outlook /Sunday Night through Wednesday/ .

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

Martin Luther King Jr Day through Monday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Seas up to 5 ft.

Tuesday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of seas approaching 5 ft.

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

Wednesday: Winds less than 25 kt.

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 Weather Advisory from 4 PM this afternoon to 1 AM EST Sunday for MAZ020>022. 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. Winter Weather Advisory from 4 PM this afternoon to 1 AM EST Sunday for RIZ005>007. MARINE . Small Craft Advisory from 7 PM this evening to 7 AM EST Monday for ANZ231>235-237-250-251-254>256.

SYNOPSIS . Loconto/Frank NEAR TERM . Loconto SHORT TERM . Loconto LONG TERM . Frank AVIATION . Loconto/Frank MARINE . Loconto/Frank


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 8 mi52 min 15°F 40°F1032.8 hPa
44013 - BOSTON 16 NM East of Boston, MA 17 mi50 min NW 5.8 G 7.8 16°F 44°F3 ft1033.7 hPa (-1.0)6°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 27 mi96 min NNW 7.8 G 9.7 13°F 42°F4 ft1032.9 hPa
FOXR1 - 8454000 - Providence, RI 40 mi52 min NNW 1.9 G 6 15°F 38°F1034.6 hPa
PVDR1 40 mi58 min WNW 4.1 G 6 16°F 1034.7 hPa-2°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 41 mi52 min N 1.9 G 4.1 17°F 1034.5 hPa
FRVM3 - 8447386 - Fall River, MA 41 mi58 min 15°F 40°F1034.6 hPa
FRXM3 41 mi58 min 16°F -0°F
CPTR1 - 8452944 - Conimicut Light, RI 43 mi52 min WNW 5.1 G 6 16°F 38°F1034.3 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 44 mi50 min NW 5.8 G 9.7 19°F 5 ft1033.7 hPa (-1.1)12°F
NAXR1 - Narragansett Bay Reserve, RI 48 mi115 min NNW 4.1 15°F 1035 hPa-1°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 48 mi52 min NNW 2.9 G 5.1 16°F 1034.9 hPa
PRUR1 49 mi58 min 17°F -1°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA8 mi46 minNNW 610.00 miOvercast16°F-5°F38%1033.9 hPa
Norwood, Norwood Memorial Airport, MA12 mi47 minN 010.00 miFair18°F-2°F41%1033.9 hPa
Marshfield Airport, MA19 mi65 minVar 510.00 miFair16°F1°F53%1034.5 hPa
Beverly, Beverly Municipal Airport, MA22 mi1.8 hrsNW 510.00 miFair10°F-2°F56%1034.5 hPa
Laurence G Hanscom Field Airport, MA22 mi49 minN 010.00 miMostly Cloudy14°F-2°F47%1035.3 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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2 days agoW8
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W9W7W9W7W5W8CalmSW6SW4NW3CalmCalmS5S6S4SE7SE10E8SE8

Tide / Current Tables for Weymouth Fore River Bridge, Massachusetts
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Weymouth Fore River Bridge
Click for Map
Sat -- 12:54 AM EST     Moonrise
Sat -- 05:19 AM EST     10.34 feet High Tide
Sat -- 07:08 AM EST     Sunrise
Sat -- 11:34 AM EST     0.10 feet Low Tide
Sat -- 11:57 AM EST     Moonset
Sat -- 04:39 PM EST     Sunset
Sat -- 05:50 PM EST     9.41 feet High Tide
Sat -- 11:54 PM EST     0.25 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.72.54.77.19.210.310.18.76.74.320.40.21.43.15.27.499.48.77.152.80.9

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    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 (9,2,3,4)
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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.