Friday, September20, 2019 L-36.com


Marine Weather and Tides
Cambridge, MA

Version 3.4
NOTICE
9/4/2019 Fixed the weather maps due to NOAA moving them.
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 6:28AMSunset 6:47PM Friday September 20, 2019 6:51 AM EDT (10:51 UTC) Moonrise 10:26PMMoonset 12:37PM Illumination 63% Phase: Waning Gibbous; Moon at 21 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- 418 Am Edt Fri Sep 20 2019
Today..W winds 5 to 10 kt, becoming S this afternoon. Waves 1 foot or less, except 3 to 4 ft at the outer harbor entrance.
Tonight..W winds 5 to 10 kt. Waves 1 foot or less, except up to 4 ft at the outer harbor entrance.
Sat..NW winds around 5 kt, becoming E in the afternoon. Waves 1 foot or less, except 3 to 4 ft at the outer harbor entrance.
Sat night..S winds 5 to 10 kt. Waves 1 foot or less.
Sun..SW winds 5 to 10 kt. Waves 1 foot or less, then around 2 ft in the afternoon.
Sun night..SW winds around 10 kt. Waves around 2 ft.
Mon..SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. A chance of showers in the afternoon.
Mon night..SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves around 2 ft in the evening, then 1 foot or less. A chance of showers.
Tue..NW winds around 10 kt. Waves 1 foot or less. A chance of showers.
Tue night..NW 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 418 Am Edt Fri Sep 20 2019
Synopsis for massachusetts and rhode island coastal waters.. High pres builds slowly builds S of the waters through Sun. Meanwhile E swell from distant hurricane humberto will impact the waters into Saturday. A cold front approaches the waters Monday night. 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 200804
afdbox
area forecast discussion
national weather service boston norton ma
404 am edt Fri sep 20 2019

Synopsis
High pressure remains in control through this weekend with
summer-like temperatures returning. Sunday on into next week,
generally speaking warmer than average temperatures and drier
than average conditions. Our next best chance of rainfall for
the foreseeable future is around Monday night as a cold front
sweeps through the region.

Near term until 6 pm this evening
High pressure remains in control with dry weather continuing.

This high pressure will shift more to our south today, resulting
in more of a westerly wind. This should permit temperatures to
rise much higher than Thursday. A weak upper level disturbance
should bring an increase in mid and high level clouds. Still
should see a lot of sunshine today.

Swell from humberto will also continue the threat for rough
surf and dangerous rip currents. With warming conditions, will
continue the high surf advisory through much of today along
ocean-exposed portions of the coast.

Short term 6 pm this evening through 6 pm Saturday
Dry weather continues tonight into Saturday. A weak front pushes
through or dissipates across our region Saturday. There is only
enough moisture with this feature to generate a period of
clouds. The warmup will continue through this period. Above
normal temperatures expected. As a side-effect of the warmer
conditions and light winds, seabreezes develop Saturday, which
will make the coasts a bit cooler for a time.

While the swell from hurricane humberto will be subsiding, it
will not be entirely gone. Still an elevated risk for rip
currents Saturday. Will continue to evaluate the need for a high
surf advisory or rip current risk statement through today. If
going to the beach this weekend, be especially cautious if there
are no lifeguards present.

Long term Saturday night through Thursday
* highlights...

- mild days, cool nights
- warmer than average temperatures, drier than average conditions
- best chance of rain for the foreseeable future around Monday night
* overview...

perhaps a cleansing rain around Monday night. Emphasized by a
+wpo +epo, when the N pacific mid-latitude pattern reloads
does the pna go largely negative with downsheared, deep
troughing across the W conus. Subsequent downshear ridging
neighbored by an active tropics courtesy of a phase 8 to 1 mjo
do we see higher heights and warmer than average temperatures.

Its only when the mid-latitude pattern releases that energy
cascades downstream aided by a strong onshore N pacific jet. An
opportunity centered around early next week, could see some much
needed rain that'll hopefully wash the allergens out of the
air. Otherwise, as ensemble-mean total rainfall out through 360
hours emphasizes, we're trapped between cyclonic flow well N w
and the tropical-axis steering flow rounding persistent n
atlantic high pressure. Subsequent subsidence ridging that
extends from the SE CONUS northeastward across our region
towards nova scotia. The latest drought monitor indicating
spotty abnormally dry conditions across the northeast,
precipitation the last 14- and 30-days having been only
50-percent of normal, any rainfall is welcoming.

Mild days and cool nights, overall above-average for late
september when highs are normally around 70 and lows around 50.

How long this pattern lasts is met with both uncertainty and
concern. CPC day 6-10 and 8-14 day outlooks have been ratcheting
up the confidence with respect to warmer than average and drier
than average conditions across the E CONUS for late september
into early october. Hit on the more significant details below.

* discussion...

around Monday night...

widespread showers and appreciable rainfall possible. Latest
suite of forecast guidance advertising a mid-level closed-low
solution. A potential ribbon of deep-layer moisture with
precipitable waters up around 1.75-inches, the warm-cloud layer
up to around 12 kft agl, a promotion of a moist-adiabatic,
conditionally-unstable environment with marginal lapse rates and
some weak elevated instability. This combined with cyclonic
flow, mid-level ascent, and diffluent motions aloft, lift along
an associated cold front with convergent low-level winds, could
see some decent rainfall, perhaps a rumble of thunder. A lot
will ride on the amplification of synoptics. Both the 20.0z gfs
and ec are in pretty good agreement of a neutral-tilt, closed
mid-level low sweeping across the region Tuesday transitioning
to a negative-tilt. Modest SW shear, it'll be interesting what
upstream outcomes manifest with daytime-heating and cloud cover.

Indications more robust thunderstorm activity could fire Monday
across upstate ny into W new england. If this activity could
evolve further S into pa with the parent mid-level vortmax that
we'd have a better shot of appreciable rainfall. Right now it
looks as if N new england will see more significant rainfall.

Chance to likely pops. A mention of thunder. And rainfall
amounts upwards of around 0.25 inches. Still some uncertainty on
timing, hopefully nailed down along with more specifics in the
next day or two.

Aviation 08z Friday through Tuesday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Saturday ... High confidence.

Vfr conditions continue. Winds turning light westerly (under 10
kts) today, continuing tonight. A weak, dry front should push
across our region Saturday. Winds remain generally from the w
to nw, except along the coasts where seabreezes are expected to
develop with the light flow.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Saturday night through Tuesday ...

Saturday night:VFR.

Sunday through Sunday night:VFR. Breezy.

Monday through Monday night:VFR. Breezy. Chance shra.

Tuesday:VFR. Slight chance shra.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Saturday ... High confidence.

Seas continue to build as swell form humberto impacts the
coastal waters today. This swell should subside some tonight
into Saturday. Winds generally remain less than 20 kt, but will
be continuing the small craft advisories due to rough seas
across the outer coastal waters.

Outlook Saturday night through Tuesday ... Moderate confidence.

Saturday night through Sunday: winds less than 25 kt.

Sunday night: winds less than 25 kt. Areas of seas approaching
5 ft.

Monday: moderate risk for small craft advisory winds with gusts
up to 25 kt. Seas up to 5 ft. Chance of rain showers.

Monday night: low risk for small craft advisory winds with
gusts up to 25 kt. Areas of rough seas. Chance of rain showers.

Tuesday: winds less than 25 kt. Local rough seas. Chance of
rain showers.

Box watches warnings advisories
Ct... None.

Ma... High surf advisory until 6 pm edt this evening for maz007-019-
020-022>024.

Ri... High surf advisory until 6 pm edt this evening for riz006>008.

Marine... Small craft advisory until noon edt Saturday for anz250-254-
255.

Small craft advisory until 8 am edt Saturday for anz251.

Small craft advisory until 6 am edt Saturday for anz256.

Synopsis... Belk sipprell
near term... Belk
short term... Belk
long term... Sipprell
aviation... Belk sipprell
marine... Belk sipprell


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 3 mi58 min 56°F 1022.6 hPa
44013 - BOSTON 16 NM East of Boston, MA 24 mi62 min W 9.7 G 12 58°F 63°F4 ft1021.4 hPa (-0.0)50°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 31 mi108 min W 7.8 G 9.7 58°F 4 ft1021.4 hPa
FOXR1 - 8454000 - Providence, RI 41 mi52 min WSW 1.9 G 2.9 51°F 65°F
PVDR1 42 mi52 min Calm G 1.9 50°F 1023.2 hPa (-0.0)45°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 45 mi52 min WSW 5.1 G 7 58°F 1022.9 hPa (-0.3)
FRVM3 - 8447386 - Fall River, MA 45 mi58 min 55°F 67°F1023.2 hPa
CPTR1 - 8452944 - Conimicut Light, RI 46 mi52 min WSW 7 G 8 51°F 66°F1022.9 hPa
FRXM3 46 mi58 min 55°F 49°F
IOSN3 - Isle of Shoals, NH 49 mi52 min WNW 5.1 G 6 53°F 1021.5 hPa (-0.0)47°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA4 mi58 minN 010.00 miA Few Clouds54°F41°F62%1022.5 hPa
East Milton, MA10 mi1.9 hrsW 10 mi50°F39°F66%1023.2 hPa
Norwood, Norwood Memorial Airport, MA12 mi59 minN 010.00 miFair38°F33°F83%1022.8 hPa
Laurence G Hanscom Field Airport, MA12 mi61 minN 010.00 miFair42°F37°F82%1023.6 hPa
Beverly, Beverly Municipal Airport, MA18 mi59 minN 010.00 miFair45°F41°F86%1021.7 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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Last 24hr6NW5N5N6NE7E7--SE9SE9E8SE7E6E5SE6S6S7S6SW5SW7SW6CalmNW5W4Calm
1 day agoN10N9N13NE14N14N14NE14
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NE11NE8NE6NE6N6N7N5N5N6N5N7NW8NW8NW7
2 days agoNW9------N10NE12NE14E13E14E12E11E10E8E8E4--E7NE5NE13NE14NE13NE11N11N10

Tide / Current Tables for Dover St. Bridge, Fort Point Channel, Boston, Massachusetts
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Dover St. Bridge
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Fri -- 03:59 AM EDT     9.11 feet High Tide
Fri -- 06:29 AM EDT     Sunrise
Fri -- 10:06 AM EDT     1.32 feet Low Tide
Fri -- 12:37 PM EDT     Moonset
Fri -- 04:13 PM EDT     9.79 feet High Tide
Fri -- 06:45 PM EDT     Sunset
Fri -- 10:26 PM EDT     Moonrise
Fri -- 10:39 PM EDT     0.86 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.55.47.28.69.18.57.15.33.521.31.93.65.77.599.89.48.16.14.12.41.10.9

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Fri -- 03:26 AM EDT     -0.00 knots Slack
Fri -- 06:18 AM EDT     -0.97 knots Max Ebb
Fri -- 06:28 AM EDT     Sunrise
Fri -- 10:09 AM EDT     0.00 knots Slack
Fri -- 12:17 PM EDT     1.26 knots Max Flood
Fri -- 12:36 PM EDT     Moonset
Fri -- 03:48 PM EDT     -0.00 knots Slack
Fri -- 06:45 PM EDT     Sunset
Fri -- 06:50 PM EDT     -1.09 knots Max Ebb
Fri -- 10:25 PM EDT     Moonrise
Fri -- 10:46 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.210.80.3-0.4-0.8-1-0.9-0.8-0.6-0.10.71.21.20.90.5-0.1-0.7-1-1.1-1-0.8-0.50.2

Weather Map
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GEOS 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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Wind Forecast for Boston, MA (6,6,7,8)
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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.