Monday, August26, 2019 L-36.com


Marine Weather and Tides
Somerville, MA

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:01AMSunset 7:30PM Monday August 26, 2019 5:04 AM EDT (09:04 UTC) Moonrise 1:21AMMoonset 4:53PM Illumination 18% Phase: Waning Crescent; Moon at 25 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- 342 Am Edt Mon Aug 26 2019
Today..NE winds around 10 kt. Waves 2 to 3 ft.
Tonight..E winds 5 to 10 kt, becoming sw after midnight. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance.
Tue..W winds around 5 kt, becoming se in the afternoon. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance.
Tue night..S winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance.
Wed..SE winds 5 to 10 kt. Waves 1 foot or less.
Wed night..SE winds 5 to 10 kt, becoming E after midnight. Waves 1 foot or less. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Thu..NE winds around 5 kt. Waves 1 foot or less. A chance of showers. Vsby 1 to 3 nm.
Thu through Fri..SW winds 5 to 10 kt. Waves 1 foot or less. 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 342 Am Edt Mon Aug 26 2019
Synopsis for massachusetts and rhode island coastal waters.. High pressure over the maritimes will build south over the waters early this week. This will bring slowly diminishing wind and seas during that time. A tropical depression may form off the coast of florida early this week. If the tropical system tracks close enough to our waters it could bring elevated seas by mid week. A cold front will approach the waters from the west on Thursday. 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 Somerville, MA
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location: 42.37, -71.07     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 260828
afdbox
area forecast discussion
national weather service boston norton ma
428 am edt Mon aug 26 2019

Synopsis
High pressure over the maritimes will build over southern new
england today and maintain dry pleasant weather through Tuesday.

Scattered showers Wednesday and Thursday ahead of a cold front.

A potential tropical system may track well southeast of
nantucket late Wednesday or early Thursday, which may produce
high surf and dangerous rip currents along the immediate
shoreline. Mainly dry conditions late this week into next
weekend.

Near term until 6 pm this evening
High pressure centered over the maritimes is building south
across new england. This is diminishing the wind over southern
new england and decreasing the onshore flow of moist air and
resulting clouds. It is also increasing the subsidence and
resulting drying of the air.

Most of the low clouds that lingered over ri and SE mass had
dissipated by 230 am. Another area of clouds was becoming
uncovered over georges bank... This was trending west and the
current trend would bring it to the outer CAPE and nantucket
around 930 am. That assumes it doesn't dissipate from subsidence
along the way.

Aside from the question of clouds over the CAPE this morning,
the overall trend for southern new england is subsidence sunny
skies dry air courtesy of the northern high pressure. Gusty
east-northeast winds will be strongest on the islands, weakest
in northern massachusetts. Gusts on the CAPE and islands may
reach 20-25 mph.

Solar mixing is expected to reach near 850-mb, where
temperatures will be 8-10c. That suggests MAX sfc temperatures
today will be in the 70s. Along the eastern mass coastline, a
few spots may top out in the upper 60s.

Short term 6 pm this evening through 6 pm Tuesday
High pressure remains in control tonight and Tuesday. Light
winds will allow temperatures to radiate tonight. Dew points
will be 45 to 55, so min temps should range from the mid 40s
inland through the 50s. The radiational cooling may also bring
areas of fog. Favored areas include the ct river valley of mass,
and the normal fog-developing spots region-wide.

Subsidence should maintain clear or mostly clear skies during
the day Tuesday. Deeper subsidence may limit the mixed layer to
just 925-mb. Temps at 925 mb will be about 16c, equiv to 8-9c
at 850 mb. That would support MAX sfc temps in the 70s.

Long term Tuesday night through Sunday
Highlights...

* temperatures will moderate to near and above normal by late this
week
* scattered showers will move across the region Wednesday afternoon
through midday Thursday as a cold front passes
* high pressure will bring mainly dry conditions into next weekend
details...

Tuesday night...

high pressure ridge across the region will slowly shift
offshore. Skies should remain partly cloudy through the night,
but clouds will slowly increase across western areas. With light
and variable or calm winds, expecting temperatures to fall to
near normal levels, mainly in mid to upper 50s except around 60
along the coast.

Wednesday through Friday...

still quite a few questions about the timing and track of the
potential tropical system that will slowly push ne, along with
the exit of the western periphery of the ridge moving offshore.

At this point, appears the low should pass well SE of nantucket,
seaward of the 40n 70w benchmark late Wed night or Thu morning.

Best chance for showers will occur after 18z Wed through wed
night. An approaching cold front will also slowly push east as
the system moves ne. Rather stable airmass across the region
should preclude any convection. However, the most likely impact
from this coastal system would be a period of rough surf along
ocean exposed beaches.

As the low exits to the open atlantic Thursday, the cold front
shifts e, moving offshore by Thu evening. Will see leftover
showers through midday or early afternoon across E coastal
areas.

High pressure builds across with dry conditions and mostly
sunny skies on Friday.

Temperatures should run around 5 degrees above seasonal normals
through the end of the week.

Saturday and Sunday...

another cold front will push across the region during Saturday.

With a dry airmass in place, along with a moisture starved cold
front, should see generally dry conditions along with light
west to northwest winds.

Expect above normal temperatures Saturday, with below normal
temperatures Sunday as the high moves in.

Aviation 09z Monday through Friday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday ... High confidence.

Today...

high pressure over new brunswick will maintain mostly clear
skies across the region and east-northeast winds today with
strongest winds gusting 20 to 25 kt across the south coast and
islands. The high will build south over our area late today,
diminishing the wind.

There is some concern about an area of clouds over the ocean
near georges bank, moving west. If these clouds hold together
they should reach outer CAPE cod and nantucket about 930 am and
affect the CAPE and islands with 2500 foot ceilings through the
rest of the morning. This will need to be monitored.

Tonight...

high pressure over the region will bring clear skies and light
wind. Radiational cooling will bring areas of fog, especially
over the ct river valley in mass. And in the regular fog spots
of SRN new england. Ifr CIGS vsbys in any fog.

Tuesday...

high pressure continues to bring mostly clear skies and light
wind. Thin cirrus will move in from the west, most likely over
ct and western ma.

Kbos terminal... High confidence in taf.VFR clear with ene wind
around 10 kt.

Kbdl terminal... High confidence in taf.VFR clear with a light
ene wind.

Outlook Tuesday night through Friday ... Moderate confidence.

Tuesday night:VFR.

Wednesday: mainlyVFR, with local MVFR possible. Slight chance
shra.

Wednesday night: MVFR ifr conditions possible. Chance shra,
patchy br.

Thursday: mainlyVFR, with local MVFR possible. Slight chance
shra.

Thursday night through Friday:VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday ... High confidence.

High pressure over the maritimes is building south over the
waters. But it continues to generate east-northeast winds over
the southern new england waters with strongest winds south of
the islands with gusts to 25 kt. The persistent wind has built
seas to 5-7 feet
as the high builds farther south today, the winds will diminish
with light winds on all waters tonight and Tuesday. Seas will
linger at 5-7 feet today and tonight, then diminish during the
day Tuesday. We will maintain small craft advisories through
that time.

Outlook Tuesday night through Friday ... Moderate confidence.

Tuesday night: winds less than 25 kt. Seas locally approaching
5 ft. Local visibility 1 to 3 nm.

Wednesday: winds less than 25 kt. Slight chance of rain
showers.

Wednesday night: winds less than 25 kt. Seas locally
approaching 5 ft. Chance of rain showers, patchy fog.

Visibility 1 to 3 nm.

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

Thursday night: winds less than 25 kt. Seas locally approaching
5 ft. Local visibility 1 to 3 nm.

Friday: winds less than 25 kt.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory until 11 am edt this morning for
anz232>234.

Small craft advisory until 6 pm edt Tuesday for anz250-251-254.

Small craft advisory until 3 pm edt Tuesday for anz255-256.

Synopsis... Wtb evt
near term... Wtb
short term... Wtb
long term... Evt
aviation... Wtb evt
marine... Wtb evt


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 1 mi65 min 57°F 1024.5 hPa (-0.8)
44013 - BOSTON 16 NM East of Boston, MA 22 mi75 min 64°F 65°F4 ft1023.2 hPa (-0.9)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 29 mi121 min NNE 12 G 14 64°F 65°F5 ft1024.5 hPa
FOXR1 - 8454000 - Providence, RI 43 mi65 min NE 6 G 8 57°F 69°F1023.5 hPa (-1.1)
PVDR1 44 mi65 min N 8 G 8.9 57°F 1023.8 hPa (-1.1)53°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi65 min NNE 8 G 11 60°F 1023.4 hPa (-1.0)
FRVM3 - 8447386 - Fall River, MA 46 mi65 min 58°F 74°F1023.7 hPa (-1.1)
CPTR1 - 8452944 - Conimicut Light, RI 47 mi65 min N 9.9 G 12 58°F 71°F1023.5 hPa (-1.2)
FRXM3 47 mi71 min 60°F 56°F
IOSN3 - Isle of Shoals, NH 48 mi65 min NNE 12 G 13 59°F 1024.6 hPa (-0.6)56°F
BGXN3 - Great Bay Reserve, NH 49 mi80 min Calm 46°F 1026 hPa46°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Norwood, Norwood Memorial Airport, MA14 mi2.2 hrsN 410.00 miA Few Clouds55°F48°F80%1024.6 hPa
Beverly, Beverly Municipal Airport, MA17 mi2.2 hrsN 610.00 miFair52°F48°F89%1024.6 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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Last 24hrN8N8N12NE14NE17NE14NE19NE17E16NE16NE15NE12NE11NE9NE10NE6N7N8N6N6N6N7N8N9
1 day agoNW9NW7--N6NE10E12E13E14E15E14E12E10E9E9E8E7E4NE4N6N5N6N6N7N7
2 days ago4W7W5NW6W9NW6NW10NW9NW8NW10
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Tide / Current Tables for Charlestown Bridge, Charles River, Massachusetts
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Charlestown Bridge
Click for Map
Mon -- 01:21 AM EDT     Moonrise
Mon -- 01:55 AM EDT     0.69 feet Low Tide
Mon -- 06:02 AM EDT     Sunrise
Mon -- 08:06 AM EDT     8.75 feet High Tide
Mon -- 02:09 PM EDT     1.22 feet Low Tide
Mon -- 04:52 PM EDT     Moonset
Mon -- 07:28 PM EDT     Sunset
Mon -- 08:22 PM EDT     10.29 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.81.30.71.434.76.58.18.78.37.15.43.62.11.21.73.35.47.49.210.2108.86.9

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Mon -- 01:20 AM EDT     Moonrise
Mon -- 01:56 AM EDT     0.00 knots Slack
Mon -- 04:02 AM EDT     1.16 knots Max Flood
Mon -- 06:02 AM EDT     Sunrise
Mon -- 07:36 AM EDT     -0.00 knots Slack
Mon -- 10:50 AM EDT     -1.00 knots Max Ebb
Mon -- 02:14 PM EDT     0.00 knots Slack
Mon -- 04:24 PM EDT     1.25 knots Max Flood
Mon -- 04:51 PM EDT     Moonset
Mon -- 07:28 PM EDT     Sunset
Mon -- 07:58 PM EDT     -0.00 knots Slack
Mon -- 11:26 PM EDT     -1.20 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1-0.70.10.91.21.10.90.4-0.2-0.7-0.9-1-0.9-0.8-0.20.71.21.21.10.7-0-0.6-1-1.2

Weather Map and Satellite Images
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GOES 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.
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Wind Forecast for Boston, MA (5,6,7,8)
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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 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.