Saturday, January25, 2020
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Marine Weather and Tides
Chelsea, 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 7:02AMSunset 4:50PM Saturday January 25, 2020 10:41 PM EST (03:41 UTC) Moonrise 8:47AMMoonset 6:35PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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- 1015 Pm Est Sat Jan 25 2020
.small craft advisory in effect until 4 am est Sunday...
Overnight..SE winds 15 to 20 kt with gusts up to 30 kt, becoming sw 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft, except 4 to 7 ft at the outer harbor entrance. Rain this evening. Vsby 1 to 3 nm.
Sun..W winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft, except 3 to 5 ft at the outer harbor entrance.
Sun night..SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves around 2 ft, except 3 to 5 ft at the outer harbor entrance.
Mon..W winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft.
Mon night through Tue night..NW winds 5 to 10 kt with gusts up to 20 kt. Waves around 2 ft.
Wed through Thu night..SW winds 5 to 10 kt with gusts up to 20 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 1015 Pm Est Sat Jan 25 2020
Synopsis for massachusetts and rhode island coastal waters.. Low pres will move ne from the mid atlc region tracking across southern new eng tonight then into maine on Sun. The low pres will move into the maritimes Mon into Tue. High pres builds over eastern canada 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 Chelsea, MA
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location: 42.37, -71.06     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 260328 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 1028 PM EST Sat Jan 25 2020

SYNOPSIS. Low pressure and a related frontal system approaching from the Mid Atlantic states will bring a period of heavy rain and strong coastal winds this evening. Another generally dry work week is on tap with slightly above normal temperatures. There is the potential for a storm to impact the region sometime next weekend, but that is far from a certainty at this point.

NEAR TERM /UNTIL 6 AM SUNDAY MORNING/. 10 PM Update .

The back edge of the precipitation shield has now reached Eastern MA. A look at MesoWest data shows widespread 0.75 to 1 inch of rain has fallen in the past 3 hours over much of Southern New England, with parts of the Berkshires East Slopes and the CT River Valley getting close to 1.25 inches where the heavy rain band lingered longer earlier this evening. Expect rain to move off shore by midnight. However, with the residual moisture from all the rain, expect areas of dense fog to develop and low clouds to linger even after winds shift to the southwest. Conditions should improve dramatically by daybreak.

SHORT TERM /6 AM SUNDAY MORNING THROUGH SUNDAY NIGHT/. Sunday:

Upper level low near western NY will lift NE through the St. Lawrence River Valley and northern Adirondacks through Sunday, with W gradient flow continuing across Southern New England. May be a generous amount of early-day cloud cover across the interior into the coastal plain as most models show shallow moisture initially below subsidence inversion. Cool advection should help to scatter/disperse cloudiness by mid-morning. Still, looking at partly to mostly cloudy skies (greatest furthest NW closer to upper low) and W winds around 10-15 mph. Though we will have cool advection, it's not a huge air mass change with 925 mb temps running from -2 to 0C thru 00z Monday. Less cloud cover in the coastal plain supports highs in the mid/upper 40s, lower-mid 40s for the Hartford- Worcester- Springfield areas and upper 30s- low 40s NW MA into the terrain in northern Worcester County where clouds will be harder to fully shake free from.

Sunday Night:

Mainly dry weather for the first part of Sunday night, with a continuation of W gradient flow. Late Sunday night into the overnight hours, a 500 mb vort lobe around the upper level low then pivots SE from northern NY into interior New England. This should lead to an increase in clouds into a larger part of central MA and northern CT. Much of eastern MA should be dry, though enough moisture in the snow growth layer per BUFKIT soundings from Worcester to Tolland N/W could support a few snow showers. Higher- resolution guidance hints at this precip extending a bit further east. Something to watch given the forcing, but feel downsloping would limit the eastward extent. Best chance at any really light accumulations is in the Berkshires where sfc temps are the coldest. Sided on the warmer end of guidance again with the cloud cover and the winds leading to a somewhat better mixed atmosphere; in turn, this results in lows 30-32F across most of the interior, with mid/upper 30s towards eastern MA and the South Coast into RI.

LONG TERM /MONDAY THROUGH SATURDAY/. Highlights .

* Another generally dry work week with slightly above normal temps

* Potential Storm next weekend, but far from a certainty

Details .

Upcoming Work Week .

The upcoming work week will feature generally dry and tranquil weather for the end of January. The mildest day of the week will be on Monday, when many locations have highs well up into the 40s. A couple of dry cold frontal passages will result in highs mainly in the upper 30s to the lower 40s the rest of the work week. Perhaps a few degrees colder than that on Thu, when high pressure in Quebec may allow for a bit of colder air to briefly work into the region.

Dry weather will generally prevail for the upcoming work week with trough axis setting up to our east. Perhaps a few brief spot rain/snow showers on Monday with the cold front and most of those will be found along the east slopes of the Berks. May also see a few ocean effect light snow showers/flurries on the Cape sometime Tue/Tue night. Regardless, dry/tranquil weather will be the main story for the upcoming work week.

Next Weekend .

The long range guidance continues to indicate the potential for a storm to impact the region sometime next weekend. High uncertainty though given this potential storm is 7-8 days out, which is basically an eternity in the model world. What eventually happens will depend on the strength/timing of southern and northern stream energy and if there is phasing, which is unknown at this point. The GEFS/EPS ensembles both show an extreme amount of spread between a very strong storm to nothing more than a weak frontal wave, as there are so many moving parts involved.

So in a nutshell, while there is the potential for a storm sometime next weekend that is about all we can say at this point. If it does come to fruition, Ptype would also be uncertain as antecedent airmass is not that cold.

AVIATION /03Z SUNDAY THROUGH THURSDAY/. Forecaster Confidence Levels .

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

03Z TAF Update:

Short Term /through Sunday Night/ .

Tonight: Moderate confidence.

Expect rain to move off shore by 05z. IFR conditions to linger through 12z due to residual moisture from the heavy rainfall.

E winds around 15-20 kt this evening with gusts up to 25-30 kt for Eastern MA terminals eastern TAFs. Winds shift to S by 06z and then SW after 08z. Wind speeds also lighten to 5-10 kts with gusts 15-20 kts, mainly on Eastern MA coast by 12z.

Sunday: High confidence.

Leftover sub-VFR conditions improve to VFR by mid-morning. May see spotty MVFR cigs late for the Berkshires/terrain, possibly at BAF. W winds 8-12 kts, with gusts 20-25 kt as clouds start to scatter.

Sunday Night: High confidence.

Generally VFR, though MVFR ceilings/iso -SHSN possible mainly for the Berkshires. W winds 7-10 kt.

KBOS Terminal . Moderate confidence. A period of moderate to heavy rainfall ~01-03z this evening with good confidence IFR, lower confidence LIFR. E gusts peaking around 30 kt tonight. Wind shift to S after 04z and then SW by 08z. Rapid improvement to VFR conditions after 08z.

KBDL Terminal . Moderate confidence. Period of moderate to heavy rainfall expected till 01z, and then turning showery through 03z with mainly IFR, lower confidence LIFR. W wind shift by 05z and then SW by 07z. Rapid improvement to VFR conditions expected after 07z.

Outlook /Monday through Thursday/ .

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

Monday Night: VFR. Breezy.

Tuesday through Wednesday: VFR.

Wednesday Night: VFR. Breezy.

Thursday: VFR.

MARINE. Short Term /through Sunday Night/ . High confidence.

10 PM Update .

Have converted Gale Warnings in Cape Cod Bay and Nantucket Sound to SCAs based on obs. Gale Warnings remain in effect for Eastern MA outer waters. Small Craft Advisories continue for all other waters.

Tonight: Thru midnight, E/SE winds 15-25 kt gusts to 30 kt on the southern waters, and 20-25 kt gusts to 35-40 kt on the eastern waters. After midnight, wind shift to WSW with speeds around 10-15 kt gusts to 25 kt on most waters. Seas build to 5-9 ft southern waters, and to 8-12 ft on eastern offshore waters east of Cape Cod.

Sunday: W winds around 10-15 kt, with gusts to 23-28 kt by afternoon, highest on the eastern waters. Seas 7-9 ft, decreasing to 5-8 ft late. Good visibility.

Sunday Night: W/WSW winds around 10-15 kt, gusts 20-23 kt. Seas 5-7 ft offshore, 2-3 ft nearshore. Good visibility.

Outlook /Monday through Thursday/ .

Monday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas.

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

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

Tuesday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Local visibility 1 to 3 nm.

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

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

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . Small Craft Advisory until 4 AM EST Sunday for ANZ230>234-236. Small Craft Advisory until 6 AM EST Monday for ANZ235-237-255- 256. Gale Warning until 4 AM EST Sunday for ANZ250-251-254.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 1 mi54 min 48°F 38°F1006.1 hPa
44013 - BOSTON 16 NM East of Boston, MA 22 mi52 min ESE 21 G 25 46°F 44°F9 ft1006.3 hPa (-6.1)46°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 28 mi98 min SE 27 G 35 45°F 42°F11 ft1006.1 hPa
FOXR1 - 8454000 - Providence, RI 43 mi54 min SSW 13 G 21 51°F 39°F1006.8 hPa
PVDR1 44 mi60 min SSE 17 G 24 50°F 1006.4 hPa49°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi54 min SSE 16 G 22 1006.5 hPa
FRVM3 - 8447386 - Fall River, MA 46 mi60 min 39°F1006.1 hPa
FRXM3 47 mi66 min 53°F 52°F
IOSN3 - Isle of Shoals, NH 47 mi42 min ESE 31 G 35 45°F 1006.1 hPa (-7.1)45°F
CPTR1 - 8452944 - Conimicut Light, RI 48 mi54 min SE 25 G 28 47°F 40°F1006.1 hPa
BGXN3 - Great Bay Reserve, NH 49 mi117 min ENE 1.9 42°F 1011 hPa42°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA2 mi48 minSE 152.00 miLight Rain Fog/Mist48°F44°F86%1007 hPa
East Milton, MA11 mi51 minSE 16 G 22 mi47°F46°F100%1007.2 hPa
Norwood, Norwood Memorial Airport, MA14 mi49 minSE 12 G 185.00 miLight Rain54°F48°F83%1006 hPa
Laurence G Hanscom Field Airport, MA14 mi51 minE 38.00 miOvercast46°F43°F89%1008 hPa
Beverly, Beverly Municipal Airport, MA16 mi49 minSE 13 G 222.00 miRain Fog/Mist46°F44°F93%1007.1 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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Last 24hrE7E10E7E7E10E9E8E10E11E12E13E12--E12E9E12E16E18E15E14E18E18
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1 day agoSW3SW3CalmN4CalmN3NW5N3N5NW5N5N5N8N8NE8NE8NE11N7N6N8N6N8N7N7
2 days agoSW5SW9SW6S6SW3SW5S8SW6SW4SW8SW12SW9SW9SW66SW8W6SW9SW6SW5SW6SW7SW8W3

Tide / Current Tables for Charlestown Bridge, Charles River, Massachusetts
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Charlestown Bridge
Click for Map
Sat -- 05:13 AM EST     0.59 feet Low Tide
Sat -- 07:04 AM EST     Sunrise
Sat -- 07:46 AM EST     Moonrise
Sat -- 11:28 AM EST     10.56 feet High Tide
Sat -- 04:48 PM EST     Sunset
Sat -- 05:35 PM EST     Moonset
Sat -- 05:51 PM EST     -0.41 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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97.96.23.91.70.612.44.579.210.410.49.37.34.82.10.1-0.40.424.36.78.5

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Sat -- 03:00 AM EST     -1.28 knots Max Ebb
Sat -- 05:07 AM EST     0.00 knots Slack
Sat -- 07:04 AM EST     Sunrise
Sat -- 07:46 AM EST     Moonrise
Sat -- 08:26 AM EST     1.22 knots Max Flood
Sat -- 11:04 AM EST     -0.00 knots Slack
Sat -- 03:20 PM EST     -1.41 knots Max Ebb
Sat -- 04:48 PM EST     Sunset
Sat -- 05:35 PM EST     Moonset
Sat -- 05:35 PM EST     0.00 knots Slack
Sat -- 08:54 PM EST     1.25 knots Max Flood
Sat -- 11:39 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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-0.5-0.9-1.1-1.3-1-0.10.711.21.20.70-0.5-0.9-1.2-1.4-1.3-0.60.40.91.11.210.4

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (22,6,7,8)
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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.