Friday, July28, 2017 L-36.com


Marine Weather and Tides
Cambridge, MA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:32AMSunset 8:09PM Friday July 28, 2017 9:04 AM EDT (13:04 UTC) Moonrise 11:17AMMoonset 11:20PM Illumination 24% Phase: Waxing Crescent; Moon at 5 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 Fri Jul 28 2017
Today..W winds around 5 kt, becoming E this afternoon. Waves 1 foot or less.
Tonight..E winds around 5 kt, becoming ne with gusts up to 20 kt after midnight. Waves around 2 ft.
Sat..NE winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft, except 4 to 6 ft at the outer harbor entrance.
Sat night..NE winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft.
Sun..NE winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Gusts up to 20 kt. Waves 2 to 3 ft.
Sun night..NE winds around 5 kt. Waves around 2 ft.
Mon..NE winds 5 to 10 kt. Waves 2 to 3 ft.
Mon night..NE winds 5 to 10 kt. Waves 1 foot or less.
Tue..N winds 5 to 10 kt. Waves 1 foot or less.
Tue night..NW winds around 5 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 716 Am Edt Fri Jul 28 2017
Synopsis for massachusetts and rhode island coastal waters.. A cold front will dissipate near the south coast today. Low pres will move off the mid atlantic coast tonight and track south of new england Sat which may bring a period of gale force ne winds. This early season gale will slowly move offshore Sunday with weak high pres building over the waters Mon. Another weak low pres may track to the south Tue. 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 281110
afdbox
area forecast discussion
national weather service taunton ma
710 am edt Fri jul 28 2017

Synopsis
Mainly dry weather today with seasonably warm temperatures and
humidity. Low pressure emerging off the mid atlantic coast
tracks south of new england Saturday, likely bringing some rain
to the immediate south coast along with cool temperatures and
gusty NE winds, but mainly dry weather further to the north.

A couple of slow moving low pressure areas off the mid atlantic
coast will keep the region in a persistent northeast flow and a
risk of more rain early in the week across southeast zones. A
cold front may approach the region late Thursday.

Near term until 6 pm this evening
7 am update...

patchy dense fog with visibilities below a quarter mile
prompted a special weather statement. Should see fog burn off in
most locations between 8 and 9 am with perhaps a few holdouts
not getting into the clear until 10 am. Otherwise, forecast
looks to be on track with very little adjustments needed to
temperatures. As noted in prior discussion, may see a few
sprinkles or light showers where there are sea breeze
convergence areas, but expect most areas to be dry today with at
least partly sunny skies. May see a fair amount of cumulus
develop this afternoon but considerable dry air and somewhat of
a subsidence inversion above.

Prior discussion...

upper level confluent flow and subsidence behind departing
shortwave will bring very dry air in the mid levels with weak
cold front likely washing out across SE new eng and becoming
overwhelmed by developing seabreezes. Mainly dry weather today
with pt-mosunny skies developing after any stratus burns off.

Models generating some marginal instability south of the pike
today where low level moisture is a bit higher. Low risk for an
isold afternoon shower across ri and SE ma in the vicinity of
weak convergence assocd with seabreezes. But no thunder given
very dry air above 750 mb with good mid level cap.

850 mb temps 13-14c supports highs into the low and mid 80s but
cooler immediate coast where seabreezes develop. A bit humid
with dewpoints low to mid 60s.

Short term 6 pm this evening through 6 pm Saturday
Tonight...

low risk for an evening shower, otherwise dry weather for much
of the night. However, as mid level low moves east from the ohio
valley, coastal low will emerge off the mid atlc coast late
tonight with deeper moisture lifting north toward the south
coast. As a result, some light rain may overspread the south
coast toward daybreak.

Saturday...

models have continued a southward trend with coastal storm.

Highly anomalous late july pattern as strong vortex across se
canada maintains enough confluence to suppress coastal storm
south of the benchmark with heavy rainfall remaining mostly to
the south, although CAPE cod and especially the islands could
get into some heavier rainfall on sat. Still some uncertainly
as there is a sharp moisture QPF gradient along the northern
edge so a subtle shift back to the north would bring heavier
rainfall back in play for a larger portion of the sne. For now,
we followed model consensus of confining highest pops across
cape islands with mainly dry weather north of hfd-pvd-tan.

Expect some sunshine developing in the interior and north of the
mass pike with partial clearing late in the day into the
coastal plain.

Anomalous NE low level jet will bring gusty NE winds to the
coast with gusts 25-35 mph with potential for 40 mph gusts over
the islands. Coolest temps in the 60s will be found across se
new eng with 70s further inland across the ct and merrimack
valleys. But lower confidence temp forecast across SE new eng on
the northern fringe of the storm.

Long term Saturday night through Thursday
Highlights...

* persistent NE flow coastal areas with possible rough surf and high
rip current risk
* risk of another bout of rain south coastal areas early next week
but considerable uncertainty
overview...

ridge persists over the western usa and over the west central
atlantic. Southern new england looks to continue to lie in an area
of mid tropospheric weakness between and somewhat susceptible the
more pronounced upper high pressure centers. One closed upper level
trough over the mid atlantic states results in a couple of
associated surface low pressure waves, which in turn introduces some
uncertainty for our forecast. There is confidence of a persistent ne
surface gradient but less confidence on NW extent of rain shield. As
the upper level trough lifts to the NE early next week, an
associated surface low pressure may lift far enough north to bring a
period of rain across some southeastern zones during Monday into
early Tuesday but higher than average uncertainly. Westerly zonal
flow dominates across southern canada later in the week with signs
on operational models and ensembles of a short wave trough and
associated cold front approaching the forecast area late Thursday.

Periods of focus... Sunday through Tuesday and Thursday.

Sunday through Tuesday... A persistent NE flow may result in a long
duration of fairly rough surf for this time of year as well as high
temperatures likely remaining a little below normal across the
coastal zones. As the mid atlantic upper low pressure lifts to the
northeast, a surface low pressure center may also lift far enough
north to spread an area of rain into southeast zones. Given the
uncertainty and 00z ECMWF trend, have only chance pops for those
southeastern zones and slight chance pops elsewhere. Persistent ne
flow will likely result in rough surf and possibly elevated rip
current risk, especially as the periods begin to increase.

Thursday... Model consensus suggests that an approaching cold front
may trigger scattered showers thunderstorms during the late
afternoon and evening. Have chance pops as well as a chance of
thunder 18z Thu to 05z Fri for much of area. Mid level winds are
not all that strong so primary hazard may be locally heavy rain.

Aviation 11z Friday through Tuesday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Today... Moderate confidence. Scattered morning ifr lifr
conditions due to fog should lift toVFR between 12z and 14z.

An isold afternoon shower is possible across ri and SE ma.

Tonight... Moderate confidence.

MainlyVFR CIGS with isolated shower threat in the evening may
trend toward MVFR toward daybreak along the south coast as rain
lifts north into the region. Patchy fog may develop across se
new eng.

Saturday... Moderate confidence.

Highest confidence of rain and MVFR conditions will be near the
south coast with mainlyVFR and dry conditions further to
north, especially mass pike northward. Increasing NE winds along
the coast with gusts to 25-30 kt developing.

Kbos terminal... High confidence. Sea breeze should develop by
midday.

Kbdl terminal... Low confidence on ifr cig potential through 12z.

High confidence after 12z.

Outlook Saturday night through Tuesday ...

Monday... MVFR and possibly ifr south coast including islands andVFR
elsewhere.

Tuesday...VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Saturday ...

today... High confidence. Light winds becoming SE in the
afternoon with seabreezes over the nearshore waters. Tranquil
seas.

Tonight... High confidence. Winds become NE overnight increasing
to 20-25 kt toward daybreak. Light rain overspreads southern
waters overnight.

Saturday... Moderate confidence. Gale watch continues. Potential
for NE gusts to 35 kt, especially southern and SE waters but
confidence not high enough to upgrade to a warning as models
have trended south with the storm. Seas may build to 10+ ft over
the eastern waters. Vsbys reduced in rain and fog, especially
southern waters.

Outlook Saturday night through Tuesday ...

confidence... Moderate
persistent NE flow will likely cause an extended period of rough
seas. Anticipate at least gusts to SCA levels across south coastal
waters into Monday, but seas will probably remain elevated through
at least Tuesday. Have gone significantly above wave watch given
our experience with persistent NE flow situations.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Gale watch from Saturday morning through late Saturday night
for anz231>235-237-254>256.

Synopsis... Kjc thompson
near term... Kjc thompson
short term... Kjc
long term... Thompson
aviation... Kjc thompson
marine... Thompson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 3 mi46 min 75°F 1010 hPa
44013 - BOSTON 16 NM East of Boston, MA 24 mi74 min WSW 7.8 G 7.8 65°F 63°F2 ft1010.7 hPa (+0.9)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 31 mi120 min W 7.8 G 7.8 64°F 62°F2 ft1009.6 hPa
FOXR1 - 8454000 - Providence, RI 41 mi46 min NNW 2.9 G 6 73°F 69°F1010.4 hPa
PVDR1 42 mi46 min SSE 1.9 G 2.9 71°F 1010.8 hPa68°F
FRVM3 - 8447386 - Fall River, MA 45 mi46 min 70°F 71°F1011.6 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 45 mi46 min SW 5.1 G 6 70°F 1010.3 hPa
CPTR1 - 8452944 - Conimicut Light, RI 46 mi46 min S 5.1 G 6 69°F 70°F1011.2 hPa
FRXM3 46 mi46 min 71°F 68°F
IOSN3 - Isle of Shoals, NH 49 mi64 min WNW 8 G 9.9 67°F 1010.1 hPa (+0.8)62°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA4 mi70 minWNW 710.00 miA Few Clouds72°F64°F79%1011 hPa
East Milton, MA10 mi68 minWNW 6 mi68°F64°F90%1012.2 hPa
Norwood, Norwood Memorial Airport, MA12 mi71 minWNW 35.00 miFog/Mist71°F68°F90%1011 hPa
Bedford, Hanscom Field, MA12 mi68 minWNW 510.00 miFair69°F64°F84%1012 hPa
Beverly, Beverly Municipal Airport, MA18 mi71 minWNW 610.00 miPartly Cloudy71°F64°F81%1010.2 hPa

Wind History from BOS (wind in knots)
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Last 24hrSW10SW16SW13
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1 day agoSE5SE7SE9SE8SE9E8E9SE13E12SE8SE6S8S11S10S9SW9SW10SW8SW11SW9SW10SW10SW10--
2 days agoN9N9NE10NE5NE9NE9E8E11E8NE5NE3E3CalmSW4SW4W5W3W3W5W4NW74N3N3

Tide / Current Tables for Dover St. Bridge, Fort Point Channel, Boston, Massachusetts
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Dover St. Bridge
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Fri -- 03:35 AM EDT     10.72 feet High Tide
Fri -- 05:33 AM EDT     Sunrise
Fri -- 09:51 AM EDT     -0.32 feet Low Tide
Fri -- 11:17 AM EDT     Moonrise
Fri -- 04:08 PM EDT     10.31 feet High Tide
Fri -- 08:07 PM EDT     Sunset
Fri -- 10:16 PM EDT     0.41 feet Low Tide
Fri -- 11:20 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
46.5910.510.69.57.552.40.3-0.30.62.54.87.49.410.39.98.46.33.91.70.50.8

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Fri -- 12:36 AM EDT     1.21 knots Max Flood
Fri -- 03:10 AM EDT     -0.00 knots Slack
Fri -- 05:32 AM EDT     Sunrise
Fri -- 07:34 AM EDT     -1.29 knots Max Ebb
Fri -- 09:43 AM EDT     0.00 knots Slack
Fri -- 11:16 AM EDT     Moonrise
Fri -- 01:05 PM EDT     1.24 knots Max Flood
Fri -- 03:44 PM EDT     -0.00 knots Slack
Fri -- 08:06 PM EDT     -1.27 knots Max Ebb
Fri -- 08:07 PM EDT     Sunset
Fri -- 10:12 PM EDT     0.00 knots Slack
Fri -- 11:19 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.21.20.80.1-0.4-0.8-1.1-1.2-1.2-0.70.30.91.11.210.5-0.1-0.6-0.9-1.1-1.3-1-0.20.6

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Northeast    EDIT
Geos

Wind Forecast for Boston, MA (9,2,3,4)
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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.