Saturday, February29, 2020
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L-36.com


Marine Weather and Tides
Cambridge, 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 6:18AMSunset 5:34PM Saturday February 29, 2020 8:53 AM EST (13:53 UTC) Moonrise 10:18AMMoonset 12:00AM Illumination 34% Phase: Waxing Crescent; Moon at 6 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 Feb 29 2020
Today..W winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft. A chance of flurries this afternoon.
Tonight..NW winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft.
Sun..NW winds 10 to 15 kt. Gusts up to 20 kt in the morning. Waves around 2 ft.
Sun night..NW winds 10 to 15 kt with gusts up to 20 kt, becoming W 5 to 10 kt after midnight. Waves around 2 ft.
Mon and Mon night..SW winds 10 to 15 kt. Waves around 2 ft.
Tue through Wed night..W winds 5 to 10 kt. Waves around 2 ft. A chance of showers. 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 Feb 29 2020
Synopsis for massachusetts and rhode island coastal waters.. A weak cold front moves across the waters by this evening followed by high pres building into new eng late Sun and Sun night. The high moves offshore Mon with a weak frontal system approaching Mon night and Tue. A stronger cold front may cross the waters Wed. 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 Cambridge, MA
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location: 42.36, -71.11     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 291155 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 655 AM EST Sat Feb 29 2020

SYNOPSIS. A disturbance will push across the region today which may bring a few flurries. Otherwise mainly dry conditions are expected this weekend with below normal temperatures as high pressure builds in from the west. The high pushes offshore Monday with milder temperatures arriving by mid week. Unsettled conditions return through mid week with showers from time to time. Colder temperatures return toward the end of next week, along with chances for rain and/or snow showers returning.

NEAR TERM /UNTIL 6 PM THIS EVENING/.

655 AM Update .

Noting a band of clouds running from Cape Ann SWwd through central Mass into N central CT on latest GOES-East Nighttime Microphysics RGB composite satellite imagery at 1130 UTC. Clouds were lifting NE in the large cyclonic flow rotating around cutoff mid level low pres across central Quebec, but the area was slowly shifting SE over the last hour or two.

With the cold airmass in place, noting a few bands of precip, one running from N central PA to near KBGM NErd toward KALY on the least NE regional 88D radar imagery. Also see some returns across KACK and into Nantucket Sound, though may not be reaching the ground due to a dewpoint depression from around 10 to as much as 20 degrees.

A rather cold start with readings in the upper teens and 20s at 11Z. Readings could recover to the mid and upper 30s this afternoon thanks to the SW wind in place, but may remain chilly further inland with temps only topping off in the 20s to around 30 across the higher terrain.

Current conditions close to near term trends, but have updated to incorporate into today's forecast.

Previous Discussion .

Mid level trough and decent shortwave passes through SNE this afternoon. Moisture increases in the 850-700 mb layer ahead of this feature which will bring increasing cloud cover, but airmass is rather dry in the low levels with low dewpoints. This will limit potential for snow showers so just expecting scattered flurries this afternoon and possibly a brief snow shower in the higher terrain. 850 mb temps cooling this afternoon and temps will be below normal with highs ranging from upper 20s to mid 30s. Gusty west winds will develop, especially this afternoon becoming NW behind a surface trough. Gusts up to 25 mph expected.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/.

Tonight .

Clearing skies expected tonight as the mid level trough moves offshore. Modest cold advection will maintain gusty winds in the evening but diminishing somewhat overnight. There will be enough wind to limit radiational cooling but cold advection will result in 925 mb temps dropping to -12 to -14C by 12z Sun. So lows will be mostly in the teens, except lower 20s outer Cape and Nantucket.

Sunday .

High pres builds in from the west with mostly sunny skies. However, below normal temps as mid level low in the Maritimes maintains NW flow and colder air aloft over New Eng. Highs ranging from upper 20s higher terrain to mid 30s coastal plain. NW winds will average 10-20 mph.

LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/.

Highlights .

* Large high pressure builds slowly east Sunday night into early Monday with near to above normal temperatures returning

* Unsettled conditions start to affect the region, with several weather systems moving across with from the southwest from late Monday through mid week as mild temperatures linger

* Will see a brief period of dry conditions before colder temperatures push in as yet another system brings a chance for rain and/or snow showers late this week

Sunday night .

A large N-S high pressure ridge slowly shifts east Sunday night. Northwest winds will remain in place, but will diminish as the stronger pressure gradient shifts offshore. While lake effect snow showers continue across W NY, with lighter winds will keep the precip from reaching western areas. So expect clear skies and dry conditions through around midnight or so before another batch of mid and high clouds approach western areas as light NW winds shift to S toward daybreak.

H85 temps start off from -8C to -11C early. But, as the ridge shifts E, will start to see warm advection aloft move in around and after midnight. With light surface winds, should see temps bottom out in the mid teens well inland through the 20s toward the coastal plain.

Monday through Wednesday .

As the steering pattern shifts around to a SW flow extending from the SW U.S. through the Ohio Valley and across the region during this timeframe, will see mild temperatures return. However, will also see increasing chances for precipitation shift NE as a couple of weather systems move across in the moist SW flow.

Will see chances for rain showers increase starting Monday night, with the best shot of rainfall from late Tuesday through Tuesday night. Some question how much moisture will work NE, with the interactions between the northern and southern streams. Some question how much rainfall the region will receive, which will also depend how much deep layer moisture works NE. 00Z GEFS ensembles continue to signal a PWAT plume working toward the region late Tue night into Wed up to 2-3 SD above normal.

Looks like the mildest temperatures of the week will occur around Tue and Wed, with highs running around 10 degrees above normal for early March.

Thursday and Friday .

Still some model solution spread during this timeframe with timing of another weather system that may shift E, as well as some intrusion of colder air trying to wrap around the departing surface system from Wed/Wed night. Timing and track issues amongst the model suite lowering confidence during this timeframe.

For now, have carried mainly dry conditions on Thursday, but will start to see chances for rain and/or snow showers return during Thu night/Fri as temperatures lower to near normal levels on Fri.

AVIATION /09Z SATURDAY THROUGH WEDNESDAY/. Forecaster Confidence Levels .

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

Today . High confidence. VFR. Bkn cigs 5-9Kft developing with chc flurries this afternoon. W-NW wind gusts 20-25 kt developing this afternoon.

Tonight . High confidence. VFR with clearing skies. NW gusts 20-25 kt in the evening diminishing 5-15 kt overnight.

Sunday . High confidence. VFR. NW gusts 15-20 kt.

KBOS Terminal . High confidence.

KBDL Terminal . High confidence.

Outlook /Sunday Night through Wednesday/ .

Sunday Night: VFR. Breezy.

Monday: Mainly VFR, with local MVFR possible. Breezy.

Monday Night: Mainly VFR, with areas MVFR possible. Breezy. Slight chance SHRA.

Tuesday: Mainly MVFR, with areas VFR possible. Chance SHRA.

Tuesday Night: Mainly MVFR, with areas IFR possible. Chance SHRA.

Wednesday: Mainly MVFR, with local IFR possible. Breezy. Chance SHRA.

MARINE.

Through Sunday . Mid level trough passage will bring another surge of gusty winds this afternoon and evening. West gusts will increase to 25 kt becoming NW this evening. The gusts will diminish overnight into Sunday with peak gusts around 20 kt. SCA for all waters except Boston Harbor and Narragansett Bay.

Outlook /Sunday Night through Wednesday/ .

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

Monday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Seas locally approaching 5 ft.

Monday Night: Winds less than 25 kt. Local rough seas. Slight chance of rain showers.

Tuesday through Tuesday Night: Winds less than 25 kt. Local rough seas. Chance of rain showers.

Wednesday: Winds less than 25 kt. Areas of rough seas. Chance of rain showers.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . Small Craft Advisory from 3 PM this afternoon to 1 AM EST Sunday for ANZ231>234-251. Small Craft Advisory from 1 PM this afternoon to 1 AM EST Sunday for ANZ237. Small Craft Advisory until 1 AM EST Sunday for ANZ235. Small Craft Advisory from 3 PM this afternoon to 7 AM EST Sunday for ANZ250. Small Craft Advisory until 7 AM EST Sunday for ANZ254>256.

SYNOPSIS . KJC/EVT NEAR TERM . KJC SHORT TERM . KJC LONG TERM . EVT AVIATION . KJC/EVT MARINE . KJC/EVT


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 3 mi59 min 31°F 38°F1007.8 hPa
44013 - BOSTON 16 NM East of Boston, MA 24 mi63 min W 14 G 18 31°F 41°F2 ft1008.3 hPa (+1.2)14°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 31 mi109 min NW 18 G 21 31°F 41°F2 ft1006.6 hPa
FOXR1 - 8454000 - Providence, RI 41 mi59 min WNW 8.9 G 14 30°F 39°F1009.6 hPa
PVDR1 42 mi53 min W 11 G 13 30°F 1009.8 hPa (+1.0)11°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 45 mi53 min W 13 G 16 30°F 1009.6 hPa (+1.0)
FRVM3 - 8447386 - Fall River, MA 45 mi53 min 30°F 40°F1009.9 hPa (+1.0)
CPTR1 - 8452944 - Conimicut Light, RI 46 mi53 min W 12 G 16 29°F 40°F1009.7 hPa
FRXM3 46 mi53 min 30°F 14°F
IOSN3 - Isle of Shoals, NH 49 mi53 min WSW 15 G 17 28°F 1007.6 hPa (+0.6)12°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA4 mi59 minSW 710.00 miMostly Cloudy29°F10°F47%1008.8 hPa
East Milton, MA10 mi62 minW 9 mi25°F10°F55%1009.1 hPa
Norwood, Norwood Memorial Airport, MA12 mi60 minW 610.00 miFair31°F15°F52%1009 hPa
Laurence G Hanscom Field Airport, MA12 mi62 minSSW 810.00 miMostly Cloudy27°F12°F55%1010 hPa
Beverly, Beverly Municipal Airport, MA18 mi60 minW 710.00 mi29°F12°F51%1008.1 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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1 day agoSE10S17
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2 days agoNE6NE6E9E9E10NE10NE10NE8NE8NE10NE10NE9NE11NE11NE12NE15NE16NE18NE19
G29
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Tide / Current Tables for Dover St. Bridge, Fort Point Channel, Boston, Massachusetts
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Dover St. Bridge
Click for Map
Sat -- 02:47 AM EST     9.43 feet High Tide
Sat -- 06:20 AM EST     Sunrise
Sat -- 09:04 AM EST     0.90 feet Low Tide
Sat -- 09:17 AM EST     Moonrise
Sat -- 03:12 PM EST     8.89 feet High Tide
Sat -- 05:33 PM EST     Sunset
Sat -- 09:20 PM EST     1.21 feet Low Tide
Sat -- 11:26 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.97.79.19.48.675.13.21.60.91.53.14.86.68.18.98.57.35.53.72.21.31.52.9

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Sat -- 02:17 AM EST     -0.00 knots Slack
Sat -- 05:28 AM EST     -1.00 knots Max Ebb
Sat -- 06:19 AM EST     Sunrise
Sat -- 09:08 AM EST     0.00 knots Slack
Sat -- 09:17 AM EST     Moonrise
Sat -- 11:07 AM EST     1.05 knots Max Flood
Sat -- 02:38 PM EST     -0.00 knots Slack
Sat -- 05:33 PM EST     Sunset
Sat -- 05:37 PM EST     -0.89 knots Max Ebb
Sat -- 09:22 PM EST     0.00 knots Slack
Sat -- 11:26 PM EST     Moonset
Sat -- 11:27 PM EST     1.15 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.80.2-0.4-0.8-1-1-0.9-0.7-0.10.7110.80.4-0.2-0.7-0.9-0.9-0.8-0.7-0.30.51.1

Weather Map
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wmap_A
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (8,2,3,4)
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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.