Thursday, April19, 2018 L-36.com


Marine Weather and Tides
Cambridge, MA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 5:54AMSunset 7:32PM Thursday April 19, 2018 5:42 AM EDT (09:42 UTC) Moonrise 8:40AMMoonset 11:39PM Illumination 16% Phase: Waxing Crescent; Moon at 4 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- 400 Am Edt Thu Apr 19 2018
.small craft advisory in effect from late tonight through Friday afternoon...
Today..W winds around 5 kt, becoming N this afternoon. Waves 1 foot or less. Rain. Vsby 1 to 3 nm.
Tonight..NW winds 5 to 10 kt, increasing to 10 to 15 kt after midnight. Gusts up to 25 kt. Waves around 2 ft. Patchy fog. A chance of rain. Vsby 1 to 3 nm.
Fri..NW winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft.
Fri night..NW winds 5 to 10 kt with gusts up to 25 kt. Waves around 2 ft.
Sat..NW winds 5 to 10 kt. Gusts up to 20 kt in the morning. Waves around 2 ft.
Sat night..NW winds 5 to 10 kt. Waves 1 foot or less.
Sun..NW winds 5 to 10 kt. Waves 1 foot or less.
Sun night..NW winds around 5 kt. Waves 1 foot or less.
Mon..NE winds around 5 kt. Waves 1 foot or less.
Mon night..S 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 400 Am Edt Thu Apr 19 2018
Synopsis for massachusetts and rhode island coastal waters.. Low pressure over the mid atlantic coast will pass south of new england today and south of nova scotia tonight. This will bring a period of rain today, with leftover showers tonight. Strong wind gusts follow on Friday. High pressure brings dry weather over the waters this weekend. 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 190759
afdbox
area forecast discussion
national weather service boston norton ma
359 am edt Thu apr 19 2018

Synopsis
Low pressure over virginia will pass south of nantucket this
afternoon and pass south of nova scotia tonight. This will bring
a period of chilly rain today. The rain may mix with wet snow,
especially in the higher elevations. Drier air moves in on
Friday, but with isolated showers possible. Building high
pressure will bring gradually warming temperatures and dry
weather into early next week. Storm system expected for mid to
late week.

Near term until 6 pm this evening
Low pressure along the mid atlantic coast will feed upon
favorable dynamics and a sharp baroclinic zone covering the mid
atlantic and southern new england. This favors strong lift, with
models showing 40-50 mb hr rates during the day. Cross sections
show moisture reaching to 500 mb. While not deep, this is
probably deep enough. Favorable lift and moisture move over our
area starting between 09z and 12z and reach maximum values
during the morning, then diminish during the afternoon.

Also of concern is precip type. Temperatures start the day
mainly in the 30s while dew points will be in the upper 20s and
lower 30s. As precip rates increase this morning, this may
induce wet bulb cooling which may bring temps down a few
degrees. Forecast profiles of temperature show borderline
rain snow profiles, and any additional cooling would only
increase the potential for snow. Profiles most favor snow over
the highlands as well as across western and central mass, and
maybe the merrimack valley. An inch or two accumulation is
possible in the highlands, with an inch or less elsewhere in the
favorable area. Mainly rain expected in ct ri southeast mass
except in the highlands along the ct ri border.

The low passes nantucket around 18z 2pm, at which time the
favorable lift starts moving off to the northeast. Surface winds
will start shifting from the northwest, bringing in drier air.

Low level temps aloft support MAX sfc temps in the low to mid
40s. The wet bulb cooling may keep some areas in the highlands
in the 30s.

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

even as the surface low moves off to the east tonight, the
upper trough will be swinging overhead. The axis is sharp, and
carries a -24c to -26c cold core. This may be sufficient to
maintain clouds and a chance of showers through the evening. The
trough moves off after midnight, after which we may see some
clearing especially in southern sections.

Friday...

cyclonic flow around the upper low continues on Friday. The
moisture aloft diminishes through the day, which should allow at
least partly sunny skies. The diminishing moisture will reduce
the development of showers, but we expect at least widely
scattered showers during the afternoon.

The cold advection and cold temperatures aloft should allow
mixing to at least 850 mb. Winds in this layer should reach 25
knots, so we expect gusts of 25-30 mph. Temperatures in the
layer support mid to upper 40s, and if mixing GOES above 850 mb
then highs in the low 50s are possible.

Long term Friday night through Wednesday
* highlights...

- near-seasonable, dry conditions over the weekend
- warmer conditions, dry, Monday into Tuesday
- mid to late week storm system
overview and model preferences...

a couple of slow meandering cutoffs to monitor through the long
term. The first, is the one that will most effectively define
sensible wx details through the weekend, formed in N new england
and shifting into the maritimes. The slow movement maintains
below normal h5 height anomalies through early next week,
yielding temps near or below normal in spite of the continued
modification. As this first cutoff shifts e, riding will build
in its wake thanks to warm advection from the w. This ridge will
dominate the forecast through the weekend and into early next
week. The second cutoff meandering through the S stream all
weekend lead to a merger point for pacific energy mid-week
yielding another risk for wet and more unsettled wx. Given
synoptics are in fair agreement between both operational and
ensemble data, will continue to use a blend for this forecast
update.

Discussion...

weekend...

upper lvl cutoff and attendant trof remain close enough to s
new england that upper lvl flow is cyclonically curved through
the period. This may assist in diurnal cloud development.

Combine this with h85 h92 temps a full std deviation below
normal (h85 roughly -4c to -6c while h92 temps run near -2c),
and expect both highs and lows to remain below seasonal normals.

Mon and tue...

moderating temperatures as ridging gains control. H85 temps
shift above 0c by Mon afternoon, with h92 temps approaching +4
to +6c. This will allow highs to reach near or even above
seasonal normals, limited in part by the strengthening
subsidence inversion as high pres crests across the region.

Also, coastal areas limited by sea breezes thanks to low lvl
flow ssts still in the 40s. Overnight lows cool thanks to
radiational cooling setup.

Mid-late next week...

a potential merger of pacific, S stream and even N stream
energy will redevelop longwave trof across the E conus, agreed
upon by most ensembles as mean height anomalies once again drop
below normal. This will yield another round of wetter and more
unsettled wx. Timing could be as early as Wed for a new round of
wet wx, but exact timing details will be better defined as we
approach.

Aviation 08z Thursday through Monday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Friday ...

today and tonight... Moderate confidence.

Vfr conditions extend to eastern pa while areas of rain have
reached to new york city and the lower hudson valley. Expect
cigs and vsbys to lower through the morning, with a period of
MVFR ifr from 13z through 18z, then again in showers 21z to 03z.

Mainly rain in the coastal plain, rain snow mixed in the
interior, and possibly all snow in western mass and the
worcester hills.

Partial clearing tonight as drier air moves in. Conditions
improve toVFR during this time. Northeast winds during the
morning turn from the northwest late in the day and at night.

Friday... High confidence.

Vfr. Northwest winds will gust to 25 knots during the day.

Widely scattered showers during the day, and some of this could
briefly cause MVFR CIGS vsbys.

Kbos terminal... High confidence in taf.

Vfr conditions change to MVFR around 15z 11 am. Brief ifr
possible if winds pick up out of the east. Precipitation mainly
rain, but some snow possible if the precipitation rate
increases. Any accumulation should remain on grassy surfaces.

Kbdl terminal... High confidence in taf.

Light precipitation develops around 09z 5 am, increasing to max
intensity 13z to 18z. Lowest CIGS vsbys expected at that time,
with some improvement during the mid afternoon, then briefly
lower again during the evening. Any snow accumulation is
expected to be confined to grassy surfaces.

Outlook Friday night through Monday ... Moderate confidence.

Friday night through Saturday:VFR. Breezy.

Saturday night through Monday:VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Friday ... High confidence.

Today... A coastal weather system moves northeast from the
delmarva coast and passes near the benchmark mid afternoon, then
moves south of nova scotia tonight. Rain will lower vsbys to
around 2-3 miles today. Winds remain below 25 knots and seas
below 5 feet.

Tonight... Increasing northwest winds tonight as the offshore
weather system moves off past nova scotia. Winds will reach 30
knots at times. Seas will build on the southern waters late at
night, with five to seven foot heights overnight. Small craft
advisory has been issued for all waters.

Friday... Northwest winds gusting to 25 knots, with seas near 5
feet on the outer waters. Small craft advisory in effect.

Outlook Friday night through Monday ... Moderate
Friday night: low risk for small craft advisory winds with
gusts up to 25 kt. Areas of seas approaching 5 ft.

Saturday through Monday: winds less than 25 kt.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory from 2 am to 3 pm edt Friday for
anz231>234-251.

Small craft advisory from 4 am to 6 pm edt Friday for anz230.

Small craft advisory from 4 am to 3 pm edt Friday for anz236.

Small craft advisory from 9 pm this evening to 3 pm edt Friday
for anz235-237.

Small craft advisory from midnight tonight to 3 pm edt Friday
for anz250.

Small craft advisory from 9 pm this evening to 8 pm edt Friday
for anz254>256.

Synopsis... Wtb doody
near term... Wtb
short term...

long term... Doody
aviation... Wtb doody
marine... Wtb doody


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 3 mi42 min 43°F 1005.4 hPa (-1.0)
44013 - BOSTON 16 NM East of Boston, MA 24 mi52 min SSW 7.8 G 9.7 42°F 43°F2 ft1005.4 hPa (-1.3)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 31 mi98 min 41°F 42°F1 ft1004.6 hPa
FOXR1 - 8454000 - Providence, RI 41 mi42 min S 1.9 G 2.9 43°F 44°F1005.9 hPa
PVDR1 42 mi42 min S 1.9 G 2.9 43°F 1006.7 hPa (-1.5)34°F
FRVM3 - 8447386 - Fall River, MA 45 mi42 min 44°F 45°F1006.8 hPa (-1.6)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 45 mi42 min S 2.9 G 5.1 44°F 1005.7 hPa (-1.6)
CPTR1 - 8452944 - Conimicut Light, RI 46 mi42 min S 5.1 G 7 42°F 46°F1006.5 hPa (-1.5)
FRXM3 46 mi48 min 44°F 34°F
IOSN3 - Isle of Shoals, NH 49 mi42 min WSW 12 G 13 41°F 1005.5 hPa (-0.8)30°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 mi48 minS 310.00 miOvercast41°F30°F67%1006.2 hPa
East Milton, MA10 mi1.8 hrsW 10 mi38°F28°F70%1006.9 hPa
Norwood, Norwood Memorial Airport, MA12 mi49 minWSW 410.00 miOvercast43°F30°F63%1006.3 hPa
Bedford, Hanscom Field, MA12 mi46 minSW 410.00 miOvercast40°F28°F65%1007.3 hPa
Beverly, Beverly Municipal Airport, MA18 mi49 minSW 310.00 miOvercast40°F30°F68%1005.6 hPa

Wind History from BOS (wind in knots)
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W10W9W9W9W6W8SW6SW6S3
1 day agoSW16SW14W18
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--W12W10
2 days agoE21
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E23NE22NE22
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NE17NE15E15E23
G29
E26E19
G25
SE16SE10SE6S8S8S8S10S10S8S12SW16

Tide / Current Tables for Dover St. Bridge, Fort Point Channel, Boston, Massachusetts
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Dover St. Bridge
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Thu -- 02:10 AM EDT     11.47 feet High Tide
Thu -- 05:57 AM EDT     Sunrise
Thu -- 08:35 AM EDT     -1.16 feet Low Tide
Thu -- 08:39 AM EDT     Moonrise
Thu -- 02:45 PM EDT     10.40 feet High Tide
Thu -- 07:30 PM EDT     Sunset
Thu -- 08:51 PM EDT     -0.11 feet Low Tide
Thu -- 11:38 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.310.411.510.99.16.53.61-0.8-10.63.15.88.21010.49.37.34.82.40.5-0.11.13.5

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Thu -- 01:44 AM EDT     -0.00 knots Slack
Thu -- 04:54 AM EDT     -1.35 knots Max Ebb
Thu -- 05:56 AM EDT     Sunrise
Thu -- 08:32 AM EDT     0.00 knots Slack
Thu -- 08:39 AM EDT     Moonrise
Thu -- 10:39 AM EDT     1.38 knots Max Flood
Thu -- 02:09 PM EDT     -0.00 knots Slack
Thu -- 05:10 PM EDT     -1.18 knots Max Ebb
Thu -- 07:30 PM EDT     Sunset
Thu -- 08:47 PM EDT     0.00 knots Slack
Thu -- 10:59 PM EDT     1.44 knots Max Flood
Thu -- 11:38 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.20.6-0.2-0.9-1.2-1.3-1.2-1-0.50.51.31.41.20.80.1-0.6-1-1.2-1.1-0.9-0.60.21.11.4

Weather Map and Satellite Images
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wmap_A
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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Other links: Northern Pacific     Contential US     Full GOES-East
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.