Thursday, September24, 2020
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L-36.com

Marine Weather and Tides
Cambridge, MA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:33AMSunset 6:39PM Thursday September 24, 2020 9:43 AM EDT (13:43 UTC) Moonrise 2:55PMMoonset 11:58PM Illumination 48% Phase: First Quarter Moon; Moon at 7 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 Edt Thu Sep 24 2020
Today..W winds 5 to 10 kt, becoming se 10 to 15 kt this afternoon. Waves 1 foot or less.
Tonight..S winds around 10 kt, becoming sw after midnight. Waves 1 foot or less.
Fri..NW winds around 5 kt, becoming E in the afternoon. Waves 1 foot or less.
Fri night..S winds 5 to 10 kt. Waves 1 foot or less.
Sat and Sat night..SW winds 5 to 10 kt. Waves 1 foot or less.
Sun..SW winds 10 to 15 kt. Waves around 2 ft.
Sun night..SW winds 10 to 15 kt. Waves around 2 ft. A chance of showers.
Mon..S winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. Showers likely.
Mon night..S winds 10 to 15 kt with gusts up to 20 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 Edt Thu Sep 24 2020
Synopsis for massachusetts and rhode island coastal waters.. High pressure will be centered south of the waters for today and Friday with light winds and calm seas. 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 241050 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 650 AM EDT Thu Sep 24 2020

SYNOPSIS. High pressure over the Mid Atlantic region will provide warm and dry weather into this weekend, with temperatures and humidity peaking Sunday, providing a touch of summer-like conditions. A pattern change toward showery weather arrives Sunday night into next week, with much needed rainfall arriving.

NEAR TERM /UNTIL 6 PM THIS EVENING/.

7 am update .

Forecast is on track this morning with no significant changes. High clouds continue to stream into western zones and cloudcover will increase through the morning.

Previous Discussion .

High pressure near the Mid Atlantic coast will be our dominant weather feature today. Lots of sunshine with above normal max temperatures. Light SW winds develop for most, but expecting an east coast seabreeze to briefly cool things down late this morning into this afternoon.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/. Seabreeze breaks down this evening, with light and variable winds most of tonight. Synoptic flow remains generally from the SW with high pressure to the south. Looking like another east coast seabreeze develops Friday. Above normal temperatures and dry weather continues.

LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/. Highlights .

* Warmer than average; temps peaking on Sunday.

* Mostly dry pattern continues for the weekend.

* A pattern change comes late weekend into next week bringing periodic rain chances as early as Sunday night through much of next week.

Details .

Friday Night through Sunday .

The quiet, dry weather pattern holds for the most part through the weekend as maritime high pressure lingers. In the upper levels flow remains generally zonal. The only fly in the ointment to the dry forecast is some shortwave energy and moisture associated with the remnants of Beta passing south of southern New England. Guidance has up until now wanted to keep the trough and deeper moisture far enough south to keep us dry Saturday. Now that we're getting into range of the higher res guidance (mainly the NAM and supported by the GEFS) chances for scattered showers have increased Saturday, mainly in western MA/CT. So, some slight POPs have been added to the forecast. Otherwise S/SW flow will bring increasing clouds Saturday, so high temps have been lowered a few degrees. Still, 850 mb temps will be on the increase from ~12C Saturday to ~16C on Sunday. This will translate to highs still above normal Saturday, in the mid to upper 70s, then peaking Sunday in the upper 70s to low 80s. Warmest temps Sunday will be in the Merrimack and CT valleys.

Sunday night through Wednesday .

As early as Sunday evening we see a prefrontal trough bringing the return of rain chances ahead of an approaching shortwave. This is the first in several rounds of rain chances, finally returning to the forecast thanks to a large scale pattern change for next week. A large ridge sets up over the western U.S. with a downstream trough over the east. Both GEFS and EPS 500 mb anomaly guidance indicate a robust troughing pattern over the Great Lakes region which will bring periodic frontal systems to New England. Showery weather is thus expected on and off through at least mid week. While this has the potential to help quench the rain starved region, there remains considerable uncertainty in the timing and magnitude of these rain events. Given the plume of >1.5" PWATs there is certainly potential for some downpours, but how widespread that good rainfall will be is yet to be seen. Guidance indicates anywhere from <0.25 inches to 1.5 inches.

AVIATION /12Z THURSDAY THROUGH MONDAY/. Forecaster Confidence Levels .

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

12Z update . High confidence through Friday

VFR. Relatively light west winds transition to southwest this morning, then linger into Friday. Pressure gradient is rather weak, so thinking seabreezes develop later this morning into this afternoon along the east coast of MA. Likely looking at a repeat of the seabreeze Friday.

KBOS Terminal . High confidence in TAF.

KBDL Terminal . High confidence in TAF. Outlook /Friday Night through Monday/ .

Friday Night through Saturday: VFR.

Saturday Night: Mainly VFR, with local IFR possible. Slight chance SHRA.

Sunday: Mainly VFR, with local MVFR possible.

Sunday Night: Mainly MVFR, with local IFR possible. Chance SHRA.

Monday: Mainly MVFR, with local IFR possible. Breezy. SHRA likely.

MARINE. Seas continue to diminish as Teddy moves farther away from the waters. Relatively light winds and seas then expected to continue through Friday with high pressure centered south of the waters.

Outlook /Friday Night through Monday/ .

Friday Night through Saturday: Winds less than 25 kt.

Saturday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers.

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

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

Monday: Winds less than 25 kt. Areas of rough seas. Rain showers likely.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 3 mi62 min 69°F 1012.7 hPa
44013 - BOSTON 16 NM East of Boston, MA 24 mi54 min W 7.8 G 9.7 61°F 61°F2 ft1012.4 hPa (+1.9)58°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 31 mi100 min NW 12 G 14 60°F 3 ft1010.7 hPa
FOXR1 - 8454000 - Providence, RI 41 mi56 min 66°F 1014.5 hPa
PVDR1 42 mi56 min 66°F 1014.6 hPa56°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 45 mi56 min 63°F 1014.7 hPa
FRVM3 - 8447386 - Fall River, MA 45 mi56 min 63°F 1014.8 hPa
CPTR1 - 8452944 - Conimicut Light, RI 46 mi56 min 61°F 1014.4 hPa
FRXM3 46 mi56 min 64°F 57°F
IOSN3 - Isle of Shoals, NH 49 mi44 min W 11 G 11 62°F 1012.7 hPa (+1.6)56°F

Wind History for Providence, RI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA4 mi50 minW 610.00 miMostly Cloudy66°F53°F63%1013.8 hPa
East Milton, MA10 mi53 minWNW 6 mi63°F53°F70%1014.9 hPa
Norwood, Norwood Memorial Airport, MA12 mi51 minW 310.00 miFair66°F55°F68%1014 hPa
Laurence G Hanscom Field Airport, MA12 mi53 minN 010.00 miFair64°F55°F73%1014.8 hPa
Beverly, Beverly Municipal Airport, MA18 mi51 minWNW 710.00 miFair66°F54°F65%1012.9 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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2 days agoN14NE14NE12
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Tide / Current Tables for Charlestown Bridge, Charles River, Massachusetts
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Charlestown Bridge
Click for Map
Thu -- 05:38 AM EDT     9.36 feet High Tide
Thu -- 06:34 AM EDT     Sunrise
Thu -- 11:35 AM EDT     0.99 feet Low Tide
Thu -- 02:54 PM EDT     Moonrise
Thu -- 05:55 PM EDT     10.37 feet High Tide
Thu -- 06:37 PM EDT     Sunset
Thu -- 11:58 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.11.53.45.67.89.19.38.46.84.82.71.31.12.246.18.29.910.49.78.36.23.81.6

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Thu -- 02:31 AM EDT     0.99 knots Max Flood
Thu -- 05:06 AM EDT     -0.00 knots Slack
Thu -- 06:33 AM EDT     Sunrise
Thu -- 09:36 AM EDT     -0.97 knots Max Ebb
Thu -- 11:34 AM EDT     0.00 knots Slack
Thu -- 02:54 PM EDT     Moonrise
Thu -- 02:54 PM EDT     0.99 knots Max Flood
Thu -- 05:29 PM EDT     -0.00 knots Slack
Thu -- 06:36 PM EDT     Sunset
Thu -- 10:07 PM EDT     -1.16 knots Max Ebb
Thu -- 11:57 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.9110.60.1-0.3-0.6-0.8-0.9-0.9-0.50.30.80.910.80.3-0.2-0.6-0.8-1-1.2-1

Weather Map
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wmap_A
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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Boston, MA
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