Tuesday, January21, 2020
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Marine Weather and Tides
Ocean Bluff-Brant Rock, 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 7:04AMSunset 4:44PM Tuesday January 21, 2020 12:23 AM EST (05:23 UTC) Moonrise 5:19AMMoonset 2:49PM Illumination 16% Phase: Waning Crescent; Moon at 26 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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ANZ251 Massachusetts Bay And Ipswich Bay- 926 Pm Est Mon Jan 20 2020
Overnight..NW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft.
Tue..NW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt in the afternoon. Seas 2 to 3 ft.
Tue night..NW winds 5 to 10 kt. Seas around 2 ft.
Wed..NW winds 5 to 10 kt, becoming N in the afternoon. Seas around 2 ft.
Wed night and Thu..W winds around 5 kt. Seas around 2 ft.
Thu night..W winds around 5 kt, becoming N after midnight. Seas 2 to 4 ft.
Fri..N winds 5 to 10 kt. Seas 3 to 5 ft.
Fri night..NE winds 10 to 15 kt. Seas 4 to 7 ft.
Sat..E winds 10 to 15 kt. Seas 5 to 8 ft. A chance of rain.
Sat night..E winds 15 to 20 kt with gusts up to 30 kt. Seas 7 to 10 ft. Rain likely. Vsby 1 to 3 nm. 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 926 Pm Est Mon Jan 20 2020
Synopsis for massachusetts and rhode island coastal waters.. High pres builds in from the west and remains in control through the end of the work week. Low pressure may approach the waters from the southwest on Saturday. 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 Ocean Bluff-Brant Rock, MA
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location: 42.15, -70.62     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 210225 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 925 PM EST Mon Jan 20 2020

SYNOPSIS. High pressure from the Midwest will build over Southern New England for most of this week, bringing dry weather. Temperatures will be cold Tuesday, then moderate the rest of this week. There is the potential for a coastal storm this weekend, but uncertainty exists in regards to timing and precipitation types.

NEAR TERM /UNTIL 6 AM TUESDAY MORNING/. 925 PM update .

High pres building in from the west tonight. Clear skies and diminishing wind becoming calm in the interior valleys will result in excellent radiational cooling. Current forecast mins look reasonable, mostly in the single numbers away from the coast with some subzero readings in the CT valley in northern MA. Lows in the teens along the coast and Cape/Islands.

Previous Discussion .

Pressure gradient leading Midwest high pressure will be diminishing over Southern New England tonight, allowing winds to diminish. The high will bring sufficient subsidence for clear skies. Upper flow remains out of the northwest. Dew points are currently in the single numbers and below zero. With clear skies and winds diminishing there should be room for radiational cooling to develop, especially in Western and Central MA/Northern CT. This points to min temps in the single numbers, and possibly a little below zero in spots.

SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/. High pressure remains in control much of the period. Expect fair weather Tuesday and Tuesday night. Temps aloft in a shallow mixing regime support max sfc temps in the 20s, possibly a few low 30s, during the day. Nighttime temps should reach the single numbers and teens.

Upper flow shows a shortwave and associated cold pool sweeping across New England Tuesday evening. Much of this is concentrated over Northern New England, but some of the cold pool and moisture reaches south of the NH border. The best chance of clouds will be along the MA east coast and over the eastern coastal waters as the cold air moves over the 4-6C water.

LONG TERM /WEDNESDAY THROUGH MONDAY/. Highlights .

* Moderating temperatures begin Wed, with above normal values Thu/Fri, along with continued dry weather

* Potential coastal storm this weekend would favor more rain than snow along the I-95 corridor, but uncertain across the interior

Details .

Wednesday through Friday .

Large high pressure will remain in control during this time. This will maintain dry/tranquil weather, but temperatures will moderate as some upper level ridging builds into southern New England. Weak gradient may allow for sea breeze development, so could be some cooling along the very immediate coast during the afternoon. Regardless, given light winds and above normal temperatures, it will feel rather comfortable outside during Thu and Fri afternoons by late January standards.

This Weekend .

The latest longer range guidance continues to depict potential for a coastal storm sometime Saturday night into Sunday night, possibly evening into Monday morning. Considerable uncertainty remains on the exact track and timing of the various components of this system, which is not all that unusual this time of year. There is rather high confidence we will see a period of measurable precipitation. Confidence is much lower on the timing and precipitation type details.

Took a consensus/ensemble mean approach to smooth over the less predictable details. That pattern suggest more of a rain/snow mix across southern New England, instead of a big snowstorm for everyone. Snow more favored across the interior, especially at night. Both options remain possibilities, however. There is some blocking expected to our north, so this could be a slow- moving coastal storm. It may be Monday morning before this low pressure moves offshore.

AVIATION /03Z TUESDAY THROUGH SATURDAY/. Forecaster Confidence Levels .

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

Tonight . High confidence.

VFR most areas. NW winds 10-15 kt diminish this evening.

Tuesday and Tuesday night . High confidence.

VFR. Northwest winds less than 10 kt.

KBOS Terminal . High confidence in TAF.

KBDL Terminal . High confidence in TAF.

Outlook /Wednesday through Saturday/ .

Wednesday through Friday: VFR.

Friday Night: Mainly VFR, with local MVFR possible.

Saturday: MVFR/IFR conditions possible. Breezy. Chance RA, slight chance SN.

MARINE. Tonight . Northwest wind diminishes early tonight with winds 10-15 kt much of the night with potential gusts to 20 kt. Seas up to 5 feet on the outer waters should subside below 5 feet by morning. Small Craft Advisory have been ended near the shore but linger on the outer waters a while longer.

Tuesday . Northwest winds 10 kt or less. Seas less than 5 feet.

Tuesday night . Possibly a few snow showers over the waters early at night. Continued northwest winds 10 kt or less and seas less than 5 feet.

Outlook /Wednesday through Saturday/ .

Wednesday through Thursday: Winds less than 25 kt.

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

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

Friday Night: Winds less than 25 kt. Rough seas up to 9 ft.

Saturday: Winds less than 25 kt. Rough seas up to 9 ft. Chance of rain.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . Small Craft Advisory until 6 AM EST Tuesday for ANZ250-254-255.

SYNOPSIS . WTB/Belk NEAR TERM . WTB/KJC SHORT TERM . WTB LONG TERM . Belk AVIATION . WTB/Belk MARINE . WTB/Belk


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44013 - BOSTON 16 NM East of Boston, MA 14 mi34 min NW 19 G 25 24°F 43°F3 ft1025.2 hPa (+0.6)9°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 26 mi34 min NW 18 G 21 25°F 7 ft1024.9 hPa (+0.6)9°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 26 mi80 min NNW 18 G 19 23°F 41°F3 ft1023.9 hPa
44090 26 mi84 min 40°F3 ft
BHBM3 - 8443970 - Boston, MA 27 mi54 min 23°F 38°F1025.1 hPa
WAXM3 - Waquoit Bay Reserve, MA 40 mi99 min W 2.9 28°F 1026 hPa6°F
FRVM3 - 8447386 - Fall River, MA 42 mi60 min 22°F 39°F1027.2 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 43 mi54 min 22°F 1027 hPa
BZBM3 - 8447930 - Woods Hole, MA 43 mi60 min 24°F 38°F1026.1 hPa
FRXM3 43 mi60 min 23°F 5°F
FOXR1 - 8454000 - Providence, RI 48 mi54 min 20°F 37°F1027.3 hPa
PVDR1 48 mi54 min 20°F 1027.4 hPa1°F
44020 - NANTUCKET SOUND 49 mi44 min 2 ft
CPTR1 - 8452944 - Conimicut Light, RI 49 mi60 min 21°F 37°F

Wind History for Borden Flats Light at Fall River, MA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Marshfield Airport, MA5 mi29 minW 510.00 miFair21°F0°F38%1026.4 hPa
Plymouth, Plymouth Municipal Airport, MA18 mi32 minW 410.00 miFair18°F1°F47%1026.3 hPa
Provincetown Municipal Airport, MA24 mi28 minNW 2110.00 miFair and Breezy25°F10°F53%1025.5 hPa

Link to 5 minute data for KGHG

Wind History from GHG (wind in knots)
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W54443NW44CalmCalm4CalmSW3--43SE6SE8
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Tide / Current Tables for Brant Rock, Green Harbor River, Massachusetts
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Tue -- 01:44 AM EST     0.00 knots Slack
Tue -- 04:20 AM EST     Moonrise
Tue -- 05:09 AM EST     1.12 knots Max Flood
Tue -- 07:07 AM EST     Sunrise
Tue -- 07:50 AM EST     -0.00 knots Slack
Tue -- 12:09 PM EST     -1.35 knots Max Ebb
Tue -- 01:50 PM EST     Moonset
Tue -- 02:22 PM EST     0.00 knots Slack
Tue -- 04:43 PM EST     Sunset
Tue -- 05:42 PM EST     1.12 knots Max Flood
Tue -- 08:30 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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-1.1-0.60.20.811.110.4-0.1-0.5-0.9-1.2-1.3-1.1-0.30.50.811.10.80.2-0.2-0.6-0.9

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 (0,6,7,8)
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Ground Weather Radar Station Boston, MA
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weather_mapweather_map weather_map

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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.