Saturday, May27, 2017 L-36.com


Marine Weather and Tides
Cambridge, MA

Version 3.4
What's New / NOTES
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 5:10AMSunset 8:12PM Saturday May 27, 2017 5:48 AM EDT (09:48 UTC) Moonrise 7:10AMMoonset 10:14PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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- 337 Am Edt Sat May 27 2017
Today..NW winds around 5 kt...becoming E this afternoon. Seas 1 foot or less.
Tonight..SE winds 5 to 10 kt. Seas 1 foot or less.
Sun..SE winds around 5 kt...increasing to 5 to 10 kt in the afternoon. Seas 1 foot or less.
Sun night..S winds 5 to 10 kt. Seas 1 foot or less.
Mon..SE winds 5 to 10 kt...becoming E 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 1 foot or less. Showers.
Mon night..NE winds 5 to 10 kt. Seas 1 foot or less. A chance of showers.
Tue..NE winds around 5 kt. Seas 1 foot or less. A chance of showers.
Tue night..S winds around 5 kt. Seas 1 foot or less. A chance of showers.
Wed..SW winds 5 to 10 kt. Seas 1 foot or less. A chance of showers.
Wed night..W winds 5 to 10 kt. Seas 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 337 Am Edt Sat May 27 2017
Synopsis for massachusetts and rhode island coastal waters.. High pressure will dominate the weather pattern for the weekend, however it is still expected to remain cool with an abundance of clouds as winds turn southerly and onshore. Broad low pressure persists a majority of the following week which will result in on and off wet-weather activity, the greater chance and higher confidence of which is expected Monday into Tuesday. 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 270731
afdbox
area forecast discussion
national weather service taunton ma
331 am edt Sat may 27 2017

Synopsis
Weak high pressure building across the region pushing E round which
onshore flow will usher slightly cooler air and an abundance of
clouds along with the possibility of drizzle. Into next week, low
pressure in the great lakes generates a coastal low late Monday
that passes off nantucket on Tuesday. This will bring wet weather
on memorial day. Daytime clouds and scattered showers will pop
up each day Tuesday through Friday keeping seasonable temperatures.

Near term until 6 pm this evening
Today...

seasonable conditions, however it'll be cooler towards the E while
warmer w. Weak high pressure in control and subsequently light winds
allows fore sea-breezes onshore flow. Marine stratus lingering round
the departed low occlusion, the N NE cloud-steering flow along with
boundary-layer mixing of residual moisture per recent rains, expect
more broken to overcast low clouds over the e-half of new england,
while scattered to the W around 2-4 kft agl, this beneath broader
cyclonic flow aloft. Certainly impacts on the temperature profile.

Will be chilly along the E ma coast, 60s adjacent inland while into
the low 70s out in the ct river valley. Following closely with high-
res forecast model temperature guidance on trends, leaning with
warmest MOS guidance with respect to the ct river valley where mid-
70s is certainly possible given light winds outside of sea-breezes.

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

turning cloudy with the possibility of drizzle. With high pressure
shifting e, will see return S onshore flow. This beneath a building
mid to upper level ridge, moisture pools beneath the dry inversion.

A weak upslope component, at minimum would expect marine stratus to
expand, but also given a sweeping weak mid-level trough and impulse
energy, can not rule out the possibility of drizzle. All aside, it
would appear to be a cool and damp night. Lows around the upper 40s.

Sunday...

so then the question becomes as to whether overnight marine stratus
lifts and or breaks up or rather holds out and remains low across
the region. Subsequent temperature implications. The mid to upper
level ridge in place as high pressure remains offshore. The onshore
flow continues beneath the dry inversion. Clouds and cool conditions
not out of the question, but the magnitude even wrf-model solutions
can't agree upon. A consensus blend given the uncertainty yields
broken to overcast cloud decks that lift through the day. Would see
temperatures warm to seasonable levels, upper 60s to low 70s, the
coolest of conditions along the shores in the low to mid 60s.

Long term Sunday night through Friday
Highlights...

* risk of rain returns Sun night into memorial day
* at or below normal temperatures will occur this upcoming week
* unsettled weather pattern continues with hit or miss showers
through the period
pattern overview...

00z guidance continues to be in agreement for the extended forecast.

However there are some difference in timing and strength of each
system. Mid to upper level ridge across the region on Sunday will
begin to give way approaching trough over the great lakes. Potent
shortwave rounding the trough will develop a surface low over the
mid-atlantic on Monday and track near southern new england Monday
night Tuesday. Beyond that, broad upper level trough will take hold
over the great lakes and northeast through the remainder of the work
week as strong ridge builds over the rockies. Bermuda high pressure
will keep the region in a moist southwest flow aloft resulting in a
chance of precip with each passing shortwave.

Temperatures...

broad upper level trough over the region will keep any summer-like
heat at bay through the period. Monday will be the coolest as low
pressure moves through. Otherwise anticipate generally seasonable
conditions on Tuesday and Wednesday thanks to southwest flow aloft
and thermal ridge. Resulting in high temps in the upper 60s to mid
70s. Mid-level wave and associated front on Thursday drop temps
aloft to well below average for late may. This will keep temps to
below climo with highs in the upper 60s to low 70s into Friday.

There is the potential that next Saturday may trend a bit warmer as
upper level trough begins to exit the region. However, the low could
linger a bit longer into next weekend. Overnight lows will linger in
the 50s through the period.

Precipitation...

a spot shower and or drizzle is possible on Sunday night despite
upper level ridge aloft. Moist east flow from passing surface high
will be trapped under an inversion as noticed in model soundings.

The berks and worcester hills have the best shot for precip from
upslope flow, this is still a low risk.

The first chance for widespread rainfall will come on memorial day
as low pressure system tracks over the great lakes and towards the
northeast. A secondary low looks to develop over the mid-atlantic
and with an increasing LLJ combined with pwats near an inch,
anticipate the risk for showery weather. Timing can still change,
but appears that the later half evening on Monday may dry out from
west to east as bulk of the precip moves in morning into early
afternoon. There continues to be a chance for some thunderstorms on
Monday as LI are below 0 and tt above 50. Why the risk is more
elevated GEFS members are indicating some surface CAPE which could
be enough for a few thunderstorms when the bulk of the precip moves
through.

Beyond Monday, there is a hit or miss chance for showers through
much of the period as upper level disturbance rotates through the
flow. Certainly not a washout by any means but believe that Tuesday
and Wednesday have the better shot for showers with Thursday
trending a bit drier thanks to northwest flow aloft.

Aviation 08z Saturday through Wednesday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday ... Moderate confidence.

Today...

sct-bkn MVFR CIGS lingering across E ma, otherwise low-endVFR. Sea-
breezes developing around 15-16z.

Tonight...

cigs becoming bkn-ovc, lowering to ifr, possible lifr, especially
across the interior. Collocated threat of -dz into the early morning
hours which may lead to vsby restrictions. Light onshore flow out of
the S e.

Sunday...

bkn-ovc CIGS slowly rising ifr towards MVFR low-endVFR mix.

Continued light onshore S flow.

Kbos taf... MVFR to low-endVFR stratus will be a nuisance a
majority of the forecast timeframe. Expect a sea-breeze around
15-16z today with sustained onshore flow up around 10 kts.

Kbdl taf... Ifr-lifr mix with dz possible overnight towards the
early morning hours Sunday.

Outlook Sunday night through Wednesday ... Moderate confidence.

Monday... Deteriorating conditions to MVFR ifr in showers and
possibly a thunderstorm. SE winds less than 20 kts.

Tuesday into Wednesday...

lingering ifr MVFR will improve toVFR for most locations. Areas of
MVFR in passing showers are still possible for Tuesday and again
Wednesday. Light E wind Tuesday becoming S in the afternoon, then
w SW Wednesday. Speeds less than 15 kts.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday ... High confidence.

Beneath high pressure, winds will remain light while mainly onshore
southerly throughout the forecast period. Seas subsiding, good
boating weather though cool given expected broken to overcast marine
stratus at times, along with the threat of drizzle overnight into
the early morning hours Sunday.

Outlook Sunday night through Wednesday ... Moderate confidence.

Winds less than 20 knots and seas less than 5 feet through the
period. Showers and isolated tstms possible on Monday. Drying trend
into the work week.

Tides coastal flooding
Though astronomical tides will be high for another night in a row,
winds as well as swell and wave action will be light. Given such
conditions, do not expect there to be much in the way of impacts
along the coast in regards to vulnerable shoreline roads becoming
inundated. Thus no coastal flood statement issued with this forecast
package.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory for hazardous seas until 2 pm edt this
afternoon for anz254>256.

Small craft advisory for hazardous seas until 11 am edt this
morning for anz235-237.

Synopsis... Dunten sipprell
near term... Sipprell
short term... Sipprell
long term... Dunten
aviation... Dunten sipprell
marine... Dunten sipprell
tides coastal flooding... Sipprell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 3 mi49 min 54°F 54°F1009.1 hPa (+1.3)
44013 - BOSTON 16 NM East of Boston, MA 24 mi59 min WNW 7.8 G 9.7 53°F 53°F3 ft1007.8 hPa (+1.3)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 31 mi105 min NW 5.8 G 7.8 51°F 49°F2 ft1007.2 hPa
FOXR1 - 8454000 - Providence, RI 41 mi49 min N 2.9 G 5.1 54°F 56°F1008.4 hPa (+1.3)
PVDR1 42 mi49 min NNW 1.9 G 2.9 54°F 1008.9 hPa (+1.4)53°F
FRVM3 - 8447386 - Fall River, MA 45 mi49 min 53°F 58°F1009.5 hPa (+1.0)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 45 mi49 min NW 2.9 G 4.1 54°F 1008.2 hPa (+1.0)
CPTR1 - 8452944 - Conimicut Light, RI 46 mi49 min N 6 G 7 54°F 57°F1009.1 hPa (+1.1)
FRXM3 46 mi49 min 54°F 52°F
IOSN3 - Isle of Shoals, NH 49 mi49 min N 6 G 7 50°F 1008.4 hPa (+1.2)48°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA4 mi55 minNW 610.00 miOvercast53°F50°F89%1009.2 hPa
East Milton, MA10 mi53 minWNW 4 mi51°F50°F96%1009.8 hPa
Norwood, Norwood Memorial Airport, MA12 mi56 minN 010.00 miOvercast53°F52°F96%1008.9 hPa
Bedford, Hanscom Field, MA12 mi53 minN 010.00 miOvercast52°F48°F89%1010 hPa
Beverly, Beverly Municipal Airport, MA18 mi56 minNW 43.00 miLight Rain Fog/Mist53°F51°F93%1008.2 hPa

Wind History from BOS (wind in knots)
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Last 24hrN9N10N11N9N11NW10NW13NW10--W13W10
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W8W9W9E9NE6E4CalmNW4N6NW6W6W7NW6
1 day agoE10NE11NE13NE13E14E19
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NE18NE15--NE17NE15NE15
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2 days agoSE4E4E4NE6E5NE5NE5E6E4E6E7E9E7E8E7E5SE4NE3N3E3NE4CalmNE7E9

Tide / Current Tables for Dover St. Bridge, Fort Point Channel, Boston, Massachusetts
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Dover St. Bridge
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Sat -- 12:40 AM EDT     12.59 feet High Tide
Sat -- 05:12 AM EDT     Sunrise
Sat -- 07:08 AM EDT     -2.15 feet Low Tide
Sat -- 07:10 AM EDT     Moonrise
Sat -- 01:20 PM EDT     11.12 feet High Tide
Sat -- 07:23 PM EDT     -0.85 feet Low Tide
Sat -- 08:10 PM EDT     Sunset
Sat -- 10:13 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
12.212.511.28.65.42.1-0.8-2.1-1.40.93.879.61110.89.16.63.71-0.7-0.41.64.57.6

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Sat -- 12:15 AM EDT     -0.00 knots Slack
Sat -- 03:48 AM EDT     -1.51 knots Max Ebb
Sat -- 05:12 AM EDT     Sunrise
Sat -- 06:57 AM EDT     0.00 knots Slack
Sat -- 07:09 AM EDT     Moonrise
Sat -- 09:35 AM EDT     1.46 knots Max Flood
Sat -- 12:45 PM EDT     -0.00 knots Slack
Sat -- 04:11 PM EDT     -1.33 knots Max Ebb
Sat -- 07:16 PM EDT     0.00 knots Slack
Sat -- 08:10 PM EDT     Sunset
Sat -- 09:43 PM EDT     1.49 knots Max Flood
Sat -- 10:13 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.2-0.6-1.1-1.4-1.5-1.4-101.11.41.51.30.6-0.2-0.8-1.2-1.3-1.3-1.1-0.30.81.41.51.4

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 (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.