Monday, June26, 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 5:07AMSunset 8:27PM Monday June 26, 2017 4:44 AM EDT (08:44 UTC) Moonrise 8:04AMMoonset 10:36PM Illumination 5% 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- 344 Am Edt Mon Jun 26 2017
Today..SW winds 5 to 10 kt. Seas 1 foot or less.
Tonight..SW winds 5 to 10 kt. Seas 1 foot or less.
Tue..SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 25 kt in the afternoon. Seas around 2 ft. A chance of showers and tstms.
Tue night..W winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas 1 foot or less. A chance of showers and tstms.
Wed..W winds 5 to 10 kt. Seas 1 foot or less.
Wed night..SW winds 5 to 10 kt. Seas 1 foot or less.
Thu..SW winds 5 to 10 kt with gusts up to 25 kt. Seas around 2 ft. A chance of showers.
Thu night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Showers and tstms likely.
Fri..SW winds 5 to 10 kt with gusts up to 20 kt. Seas 1 foot or less. A chance of showers and tstms.
Fri night..SW winds around 5 kt. Seas 1 foot or less. A chance of showers and tstms. Winds and seas higher in and near tstms. 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 344 Am Edt Mon Jun 26 2017
Synopsis for massachusetts and rhode island coastal waters.. Weak cold fronts will move into the waters this evening and again Tue evening. High pres builds south of the waters Wed. A warm front will lift north through new eng Thu with gusty sw winds developing late Thu into Fri. 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 260806
afdbox
area forecast discussion
national weather service taunton ma
406 am edt Mon jun 26 2017

Synopsis
Additional upper level disturbances move across new england
today and Tuesday, bringing a few showers and isolated
thunderstorms with the greater threat on Tuesday. A warming
trend begins for the latter half of the week with a return to
summer heat and humidity Friday and Saturday. A warm front may
bring some showers Thursday night with more showers and
thunderstorms possible Friday through the weekend.

Near term through today
Mid level shortwave and assocd mid level cooling which brought
the showers and t-storms to sne last night has lifted to the ne.

Weak subsidence behind this wave will maintain dry conditions
through the morning. Another weak shortwave approaches from the
sw this afternoon and will bring a few showers and isold
t-storms, mainly interior. Sbcapes are marginal, 200-400 j kg,
and 500 mb temps are actually warming slightly today which
should result in limited coverage of convection. Mainly dry in
ri and SE ma as rather dry air in the mid levels along with
very low ki values near the coast will likely keep any showers
and t-storms to the north and west so we have dry conditions
here.

850 mb temps around 10-11c will result in MAX temps in the
upper 70s to lower 80s. Comfortable humidity levels with
dewpoints down in the upper 40s and lower 50s.

Short term tonight through 6 pm Tuesday
Tonight...

any lingering convection will diminish in the evening, otherwise
quiet night with light winds and a few clouds given moisture in
the 850-700 mb layer. Lows in the 50s.

Tuesday...

another robust shortwave will lift NE from the gt lakes and
move into northern new eng late in the day. The mid level trof
approaches sne from the west with decent mid level cooling as
500 mb temps drop to near -20c in the west and -16 to -18c in
the east. This will contribute to steepening mid level lapse
rates and sbcapes 500-1000 j kg. Highest capes may end up near
the i-95 corridor where higher dewpoints pool in the afternoon
from increasing SW flow. Expect sct showers t-storms developing
around midday through the afternoon.

Strengthening mid level flow from approaching trof will lead to
0-6km shear up to 50 kt so a few strong to severe storms are
possible depending on the magnitude of instability. If capes can
reach 1000 j kg probability of severe will increase. Hail and
gusty winds would be the primary threats.

Temps will be a few degrees cooler than today given slight 850
mb cooling, with highs 75-80 degrees and continued comfortable
humidity levels. Deep mixing and increasing low level winds will
result in gusty SW winds in the afternoon, with gusts to 20-30
mph possible, especially coastal plain.

Long term Tuesday night through Sunday
Highlights...

* pleasant Wednesday with low risk of a shower
* heat and humidity return Friday into Sunday
* thunderstorm chances increase Thursday night through Sunday
pattern details...

00z guidance is in general agreement synoptically with some
difference in strength and timing for each wave late in the week.

Upper level trough will move through the flow Tuesday night with
southern new england on the backside Wednesday. Quasi-zonal flow
will set-up across the region on Thursday with the flow with
becoming more amplified by the weekend. Resulting in a broad trough
over the great lakes and another trough over the mountain west with
weak ridge between the two. Because the flow is becoming more
amplified, sub-tropical ridge is also building closer to the region
late in the weekend. Ridging out west by Sunday will push the great
lakes trough towards the northeast for early next week.

Details...

Tuesday night into Wednesday...

scattered shower and thunderstorms will linger Tuesday night as
upper level trough continues to push through the area. Trough axis
will be offshore by Wednesday putting southern new england in weak
northwest flow. Depending on how quickly precip moves offshore,
Tuesday night may be quite pleasant with temperatures in the low to
mid 50s with low humidity.

Surface high pressure will slide into the area on Wednesday as
ridging builds a loft. Steep lapse rates with some moisture in the
mid-levels will help develop diurnal CU by the afternoon. Mixing up
to 750 mb will result in temperatures in the upper 70s with breezy
westerly flow near 20-25 mph. Guidance shows very little QPF on
Wednesday, but cannot rule out a few pop-up showers by the late
afternoon hours. While confidence is higher north of the region,
southern new england will see instability values above 500 j kg with
k values above 25c. This may be enough for a spot shower.

Winds aloft will begin to turn more to the southwest by Wednesday
night with waa. Overnight lows will remain around 60.

Thursday...

dry day to start as high pressure will slide south of the region.

The flow will turn more active with zonal flow aloft and a few weak
waves passing through. Impressive warming aloft as surface warm
front pushes through the region. This will push southern new england
in the warm sector resulting in increasingly warm and humid
temperatures.

Scattered showers and thunderstorms are anticipate by the latest
guidance suggests not until the evening hours as mid-levels will
remain quite dry. A weak shortwave moves through the flow Thursday
evening night. With zonal flow and both 850mb isotherms and winds
becoming parallel, appears that anything the fires across upstate ny
will ride through the flow moving into the area. In fact, guidance
is indicating a lingering MCS will move through the flow overnight
which could result in a few strong storms, ESP north of the pike.

This region has the best area of instability and 0-6 km shear
values. Still uncertainty on where this will set-up as it could
still move north of the region, or south. Something to watch over
the upcoming week.

Friday into Sunday...

unsettled weather patter for this time period as southern new
england remains in the warm sector with heat and humidity. With 850
mb temps near 2 std above normal, appears that the potential for 90
degrees returns on Friday and Saturday. Back door cold front appears
to remain well north of the region per latest GFS and ec. Thus have
gone above guidance for Saturday temps. Heat headlines may be
needed.

Chance for showers and thunderstorms each day, but difficult to place
the exact timing and location of any strong storms. Regardless, the
potential for strong to severe weather appears possible through the
period as frontal boundary lingers north of the region. One caveat
to watch is the subtropical ridge. If this ridge moves closer, it
may keep portions of the area dry.

Aviation 07z 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.

Through 12z...

vfr. A brief shower may clip immediate south coast and
cape is;ands through 08z, otherwise clearing skies.

Monday...

vfr with sct-bkn CU 5-6k ft developing, mainly north of the
south coast region. Sct showers and isold t-storms expected to
develop in the afternoon in the interior.

Monday night...

vfr. A few lingering showers or an isold t-storm interior
early, otherwise areas of mid level clouds.

Tuesday...

vfr with bkn CIGS 5-7k ft. Sct showers and t-storms expected
from midday through the afternoon which may bring briefly lower
conditions.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Tuesday night through Friday ...

Wednesday... High confidence. MainlyVFR. NW gusts to 20 kts.

Thursday... Moderate confidence. MainlyVFR. Afternoon showers
possible in the interior with showers t-storms possible all sne thu
night. Gusty SW winds to 25-30 kt developing, especially coastal
plain.

Friday... Moderate confidence. Patchy early morning fog, with local
MVFR. ThenVFR, except local ifr in possible strong thunderstorms,
mainly during the afternoon and evening hours.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday night ... High confidence.

Winds and seas mostly below SCA thresholds through the period
with SW flow. A few gusts approaching 20 kt nearshore waters
each afternoon but there is a risk of some 25 kt gusts over
boston harbor and narragansett bay Tue afternoon.

Outlook Tuesday night through Friday ...

Wednesday... High confidence. Quiet boating weather with winds and
seas below sca. Gusts to 20 kt possible nearshore waters.

Thursday... Moderate confidence. Small craft advisories will likely
be needed. Increasing SW winds with gusts to 25+ kt likely,
especially over nearshore waters. Building seas may reach 6 to 8 ft
over southern waters Thu night.

Friday... Moderate confidence. SW winds continue, mainly 20-25 kt
with building seas. Scattered thunderstorms, some with reduced
visibilities and strong gusty winds.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Kjc dunten
near term... Kjc
short term... Kjc
long term... Dunten
aviation... Kjc dunten
marine... Kjc dunten


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 3 mi44 min 66°F 1012.1 hPa (-0.3)
44013 - BOSTON 16 NM East of Boston, MA 24 mi54 min W 9.7 G 9.7 60°F 59°F1 ft1012.7 hPa (+0.0)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 31 mi100 min W 9.7 G 12 62°F 59°F1 ft1011.9 hPa
FOXR1 - 8454000 - Providence, RI 41 mi44 min N 4.1 G 6 65°F 70°F1012.8 hPa (-0.4)
FRVM3 - 8447386 - Fall River, MA 45 mi44 min 65°F 72°F1014.1 hPa (-0.3)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 45 mi44 min NNW 1.9 G 2.9 65°F 1012.8 hPa (+0.0)
FRXM3 46 mi44 min 65°F 57°F
CPTR1 - 8452944 - Conimicut Light, RI 46 mi44 min NW 5.1 G 7 66°F 72°F1013.7 hPa (+0.0)
IOSN3 - Isle of Shoals, NH 49 mi44 min WSW 16 G 16 64°F 1012.2 hPa (-0.0)53°F

Wind History for Providence, RI
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA4 mi50 minW 910.00 miA Few Clouds65°F53°F66%1013.1 hPa
East Milton, MA10 mi48 minW 10 mi61°F51°F70%1014 hPa
Norwood, Norwood Memorial Airport, MA12 mi51 minN 010.00 miA Few Clouds57°F55°F93%1013.2 hPa
Bedford, Hanscom Field, MA12 mi48 minW 410.00 miFair57°F54°F90%1014.5 hPa
Beverly, Beverly Municipal Airport, MA18 mi51 minWSW 410.00 miFair58°F57°F97%1012.5 hPa

Wind History from BOS (wind in knots)
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Last 24hrW8W8W10W8W8W10
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G25
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W7SW13SW15SW11W9NW9W7W7W8W8W9
1 day agoS11SW12SW11S7S11SW9S5SW9SW9W11W11
G19
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2 days ago3SW9S8S7SW5S6S9S9S15S15
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S9SW8S10SW10S12S10

Tide / Current Tables for Dover St. Bridge, Fort Point Channel, Boston, Massachusetts
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Dover St. Bridge
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Mon -- 01:16 AM EDT     12.41 feet High Tide
Mon -- 05:09 AM EDT     Sunrise
Mon -- 07:43 AM EDT     -1.90 feet Low Tide
Mon -- 08:04 AM EDT     Moonrise
Mon -- 01:57 PM EDT     10.87 feet High Tide
Mon -- 07:57 PM EDT     -0.56 feet Low Tide
Mon -- 08:25 PM EDT     Sunset
Mon -- 10:35 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.112.31210.27.44.20.9-1.4-1.8-0.424.97.910.110.910.18.25.62.70.3-0.60.42.75.5

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Mon -- 12:47 AM EDT     -0.00 knots Slack
Mon -- 04:49 AM EDT     -1.45 knots Max Ebb
Mon -- 05:08 AM EDT     Sunrise
Mon -- 07:28 AM EDT     0.00 knots Slack
Mon -- 08:04 AM EDT     Moonrise
Mon -- 10:37 AM EDT     1.40 knots Max Flood
Mon -- 01:22 PM EDT     -0.00 knots Slack
Mon -- 05:26 PM EDT     -1.29 knots Max Ebb
Mon -- 07:50 PM EDT     0.00 knots Slack
Mon -- 08:24 PM EDT     Sunset
Mon -- 10:35 PM EDT     Moonset
Mon -- 10:55 PM EDT     1.35 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.7-0.2-0.8-1.2-1.4-1.5-1.3-0.50.61.21.41.410.3-0.4-0.9-1.2-1.3-1.3-0.80.211.31.4

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 (4,6,7,8)
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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.