Sunday, May26, 2019 L-36.com


Marine Weather and Tides
Chelsea, MA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 5:11AMSunset 8:10PM Sunday May 26, 2019 3:45 PM EDT (19:45 UTC) Moonrise 1:39AMMoonset 12:11PM Illumination 47% Phase: Third Quarter Moon; Moon at 22 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- 338 Pm Edt Sun May 26 2019
.small craft advisory in effect until 8 pm edt this evening...
Tonight..NW winds 5 to 10 kt. Gusts up to 25 kt this evening. Waves 1 foot or less.
Mon..N winds around 5 kt, becoming E in the afternoon. Waves 1 foot or less.
Mon night..E winds around 5 kt, becoming N after midnight. Waves 1 foot or less.
Tue..NE winds around 5 kt, becoming se in the afternoon. Waves 1 foot or less. Showers likely in the afternoon.
Tue night..SE winds 5 to 10 kt. Waves 1 foot or less. Showers likely.
Wed..E winds 5 to 10 kt. Waves 1 foot or less. A chance of showers.
Wed night..SE winds 5 to 10 kt, becoming S after midnight. Waves 1 foot or less. Showers likely.
Thu..SW winds around 10 kt. Waves 1 foot or less. A chance of showers.
Thu night..SW winds around 10 kt. Waves 1 foot or less. Showers likely in the evening. A chance of showers after midnight.
Fri..W winds around 10 kt. Waves 1 foot or less. A chance of showers.
Fri night..W winds 5 to 10 kt. Waves 1 foot or less. A chance of showers in the evening. 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 338 Pm Edt Sun May 26 2019
Synopsis for massachusetts and rhode island coastal waters.. A weak cold front moves across the waters late today and this evening. High pres builds across the waters Mon, with another cold front moving south of the waters Mon night. High pres moves east of the waters Tue as the front approaches new eng as a warm front. Weak low pres tracks along the front south of new eng Tue night into Wed. A cold front approaches new eng Thu. 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 261943
afdbox
area forecast discussion
national weather service boston norton ma
343 pm edt Sun may 26 2019

Synopsis
Isolated showers in and around southern new england but even
these should diminish this evening. A cold front swings across
the region early tonight. High pressure then builds over new
england for Monday and Monday night with dry, seasonable
weather. A few weak lows will move along a wavering front
across the region late Tuesday into Thursday, bringing the
threat for showers. Milder temperatures move in during Thursday
ahead of an approaching cold front, with the threat for more
showers and isolated thunderstorms. The front exits early
Friday, with dry and seasonable conditions to start next
weekend.

Near term until 6 am Monday morning
This evening... Fields of cumulus clouds built over southern new
england during the afternoon and will linger to near sunset.

Isolated showers did pop during the afternoon, such as near
westfield in western massachusetts. However dry air above these
clouds, about 10 thousand feet agl, was capping any potential
for growth in these clouds and showers. Expect the isolated
showers this evening, but most locations should remain dry.

A much broader area of showers over pa and adjacent ny is moving
southeast and diminishing. This may reach parts of western and
southern ct, but should stay at or south of hartford.

Tonight...

weak cold front from northern vt nh moves south through our area
early tonight. Winds shift from the northwest and bring in lower
dew points for our area during the night... Dew points reach the
upper 40s and low 50s by morning. Winds further shift from the
north by morning. Expect clearing skies. Temperatures upstream
last night were in the upper 40s and 50s... We will go with min
temps in the 50s.

Short term 6 am Monday morning through Monday night
High pressure in control Monday and Monday night. Some signs of
a weak front trying to shift south through our area in the
afternoon. Limited low level convergence, but in an area of
general subsidence. Limited moisture and lots of dry air above
800 mb, so any trend to form showers will be fighting a
difficult battle.

The center of the high will pass to our north, making it easier
for light winds to turn from the northeast and southeast during
the day. So in addition to plenty of sunshine, expect sea
breezes in the usual spots along the coast. Inland, mixing is
expected to reach to 800 mb, tapping temps equiv to 8-10c at 850
mb. This suggests MAX temps in the mid to upper 70s inland,
with cooler temps at the shoreline.

Dry weather continues Monday night as the high pressure slowly
moves offshore. Increasing cloud level moisture will mean
increasing clouds overnight. But dry air lingers in the surface
layer through 12z Tuesday, so any showers will have a difficult
time moving in. At best, a couple could reach the ct valley
toward morning.

Long term Tuesday through Sunday
Highlights...

* turning cooler Tuesday with rain showers
* a front lingers across the region Wed and Thu with unsettled
conditions and warming temperatures
* cold front approaches Thu thu night bringing mild temperatureswith
showers and isolated thunderstorms
* rain exits Friday, then mainly dry, seasonable conditions early
next weekend
overview...

progressive pattern continues through the end of the workweek with
several rounds of rain tues-fri and brief breaks in between. The
persistent subtropical ridge bringing record heat to the southeast
holds on through mid-late week which serves to direct several
shortwaves over top of ridge into southern new england. Increasing
warmth and moisture ahead of a late week cold front will bring our
best chance of thunderstorms around Thursday Thursday night
before things begin to dry out under high pressure.

Details...

Tuesday through Wednesday night...

Tuesday will be cooler and wetter than memorial day as a low
pressure system approaches and crosses the region to the south.

Moisture spilling over the ridge brings increased cloudcover in the
morning before rain overspreads the area mid-late morning. Sne is
placed under the rrq of an upper level jet which will provide some
synoptic lift in addition to a southerly 30-40kt LLJ which develops
as the same time bringin speed convergence in the low levels.

This helps pull in a swath of higher pwats (>1") which all
together should bring from 0.25"-0.75" of rain by Wednesday
morning, with some locally higher amounts. Instability is
lacking and we're not expecting any thunder with this system.

Colder air filters in aloft (850mb temps ~5c) and this with the
southerly track of the low associated NE flow at the surface
will bring cool temps, in the upper 50s and low 60s.

The best lift forcing moves off early Wednesday and rain should taper
off, if briefly. Clouds thin but hang around. Beyond this point
there remains a good deal of uncertainty in the evolution of
the next low pressure system and where it tracks, but there is
general consensus that a warm front will begin to work its way
north through the region on Wednesday. This stems from a low
forming to our northwest. Along with warmer temperatures (upper
60s-70s) this brings another round of rain showers Wednesday
afternoon into the early morning hours of Thursday.

Thursday and Friday...

we may get a reprieve from the rain for a time, Thursday morning
into the early afternoon. Temperatures will be on the rise (
dewpoints as well) as all of southern new england gets into the warm
sector. This will help increase instability ahead of the cold
front and lead to thunderstorm chances in the
afternoon overnight hours. Shower and thunderstorm chances
increase the latter half of Thursday into Friday as the cold
front approaches from the west. Timing is uncertain, but for now
sticking with the more consistent guidance showing an earlier
passage, which would have showers exiting the region early
Friday. This as northwest winds bring a much drier column
overhead with pwats back down near 0.5". Cooler temps in the
post frontal air mass should bring highs in the 70s.

Saturday and Sunday...

best chance of a nice weekend day looks to be Saturday under surface
high pressure and slight ridging at the mid levels. The average high
for boston on the first day of meteorological summer is 71, right
around what is currently forecast for Saturday. So, at this point,
its looking like a seasonable start to summer, with widespread 70s. The
latter half of the weekend looks more unsettled ahead of an
approaching shortwave.

Aviation 20z Sunday through Friday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Monday night ... High confidence.

This evening...VFR. Widely scattered showers possible in
southern ct but attempts to trend farther north will run into a
lot of dry air. Any showers that do pop into southern new
england will have minimal effect on visibility.

Tonight...VFR. Clearing skies. Winds shifting from the
northwest and then north, becoming light.

Monday...VFR. Sea breezes developing late morning into the
afternoon.

Monday night...VFR. Increasing clouds after midnight, but bases
remain above 3000 feet.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Tuesday through Friday ...

Tuesday: mainlyVFR, with local MVFR possible. Shra likely.

Tuesday night: mainlyVFR, with areas ifr possible. Breezy.

Shra likely.

Wednesday: mainlyVFR, with local ifr possible. Breezy. Chance
shra.

Wednesday night: mainlyVFR, with local MVFR possible. Breezy.

Chance shra.

Thursday:VFR. Breezy. Chance shra, isolated tsra.

Thursday night: mainlyVFR, with local MVFR possible. Breezy.

Chance shra, isolated tsra.

Friday:VFR. Breezy. Chance shra, isolated tsra.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Monday night ... High confidence.

Tonight... Nw winds quickly diminish in the evening becoming n
overnight. Data buoys showed 5 ft seas in mass bay this
afternoon, so will maintain small craft advisory for a few more
hours, but expect seas to diminish this evening. Seas 4 feet or
less all areas tonight. Small craft advisory continues on mass
bay and boston harbor through this evening for wind gusts near
25 kt.

Monday... Light northerly winds turning onshore over nearshore
waters in the afternoon as sea breezes develop. Seas remain 4
feet or less.

Monday night... North to northeast wind 10 kt or less. Seas less
than 4 feet.

Outlook Tuesday through Friday ...

Tuesday: winds less than 25 kt. Chance of rain showers.

Tuesday night: winds less than 25 kt. Seas locally approaching
5 ft. Rain showers likely.

Wednesday through Wednesday night: winds less than 25 kt. Areas
of seas approaching 5 ft. Chance of rain showers.

Thursday through Friday: winds less than 25 kt. Areas of seas
approaching 5 ft. Chance of rain showers, isolated
thunderstorms.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory until 8 pm edt this evening for anz230-
250-251.

Synopsis... Wtb bw
near term... Wtb
short term... Wtb
long term... Bw
aviation... Wtb bw
marine... Wtb bw


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 1 mi34 min 84°F 1008.2 hPa
44013 - BOSTON 16 NM East of Boston, MA 22 mi56 min SE 12 G 16 64°F 56°F4 ft1007.8 hPa (-2.5)58°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 28 mi102 min SSW 9.7 G 12 61°F 54°F5 ft1007.6 hPa
FOXR1 - 8454000 - Providence, RI 43 mi28 min S 8.9 G 12 78°F 59°F1008.9 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi28 min SW 14 G 17 70°F 1009.4 hPa
FRVM3 - 8447386 - Fall River, MA 46 mi28 min 78°F 62°F1010.1 hPa
FRXM3 47 mi34 min 75°F 62°F
IOSN3 - Isle of Shoals, NH 47 mi46 min SSW 5.1 G 7 74°F 1006.8 hPa (-2.1)55°F
CPTR1 - 8452944 - Conimicut Light, RI 48 mi28 min SSE 12 G 16 70°F 62°F1009.6 hPa
BGXN3 - Great Bay Reserve, NH 49 mi61 min W 9.9 83°F 1008 hPa60°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA2 mi52 minW 15 G 2410.00 miMostly Cloudy86°F57°F39%1008.2 hPa
East Milton, MA11 mi1.8 hrsW 14 G 27 mi83°F59°F44%1010.5 hPa
Norwood, Norwood Memorial Airport, MA14 mi53 minW 10 G 2110.00 miA Few Clouds88°F59°F38%1008.7 hPa
Laurence G Hanscom Field Airport, MA14 mi50 minW 14 G 2210.00 miPartly Cloudy86°F57°F39%1009.3 hPa
Beverly, Beverly Municipal Airport, MA16 mi53 minW 10 G 2110.00 miMostly Cloudy84°F57°F41%1007.1 hPa

Wind History from BOS (wind in knots)
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Last 24hrE14E16SE12S13S13S13SW13
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S11S10SW12SW9SW13SW11W8W9W94SW9W11W15
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1 day agoNE14N16NE9NE14E6NE7E8E3CalmSW4W4W6W7W7W7W8NW9NW94SE7SE9SE12E11E16
2 days agoSW22
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Tide / Current Tables for Charlestown Bridge, Charles River, Massachusetts
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Charlestown Bridge
Click for Map
Sun -- 01:38 AM EDT     Moonrise
Sun -- 05:13 AM EDT     Sunrise
Sun -- 05:30 AM EDT     9.18 feet High Tide
Sun -- 11:52 AM EDT     1.22 feet Low Tide
Sun -- 12:11 PM EDT     Moonset
Sun -- 12:34 PM EDT     Last Quarter
Sun -- 06:14 PM EDT     8.62 feet High Tide
Sun -- 08:09 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.33.44.86.4899.18.26.753.21.71.21.934.56.37.98.68.47.464.42.9

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Sun -- 01:38 AM EDT     Moonrise
Sun -- 02:44 AM EDT     0.90 knots Max Flood
Sun -- 05:10 AM EDT     -0.00 knots Slack
Sun -- 05:13 AM EDT     Sunrise
Sun -- 09:53 AM EDT     -1.05 knots Max Ebb
Sun -- 11:55 AM EDT     0.00 knots Slack
Sun -- 12:11 PM EDT     Moonset
Sun -- 12:34 PM EDT     Last Quarter
Sun -- 03:17 PM EDT     0.93 knots Max Flood
Sun -- 05:50 PM EDT     -0.00 knots Slack
Sun -- 08:08 PM EDT     Sunset
Sun -- 10:24 PM EDT     -0.97 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.80.90.90.60.1-0.3-0.6-0.8-1-1-0.70.10.70.80.90.80.4-0.1-0.4-0.6-0.8-0.9-0.9

Weather Map and Satellite Images
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GOES 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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Wind Forecast for Boston, MA (15,3,4,5)
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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 numerious 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.