Saturday, February23, 2019 L-36.com


Marine Weather and Tides
Cambridge, MA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:27AMSunset 5:27PM Saturday February 23, 2019 10:43 AM EST (15:43 UTC) Moonrise 11:28PMMoonset 10:03AM Illumination 82% Phase: Waning Gibbous; Moon at 19 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- 1011 Am Est Sat Feb 23 2019
.gale watch in effect from late Sunday night through late Monday night...
This afternoon..Light and variable winds, becoming S around 5 kt. Waves 1 foot or less.
Tonight..S winds 5 to 10 kt, becoming se 10 to 15 kt with gusts up to 20 kt after midnight. Waves 1 foot or less, then around 2 ft after midnight. Rain after midnight.
Sun..SE winds 15 to 20 kt, becoming S 10 to 15 kt in the afternoon. Gusts up to 25 kt. Waves around 3 ft. Patchy fog. Rain. Vsby 1 nm or less.
Sun night..SW winds 10 to 15 kt with gusts up to 25 kt, becoming W 15 to 20 kt with gusts up to 35 kt after midnight. Waves around 2 ft, except 4 to 5 ft at the outer harbor entrance. Patchy fog in the evening with vsby 1 to 3 nm.
Mon..W winds 20 to 25 kt, increasing to 25 to 30 kt in the afternoon. Gusts up to 45 kt. Waves around 2 ft.
Mon night..W winds 20 to 25 kt with gusts up to 45 kt, diminishing to 15 to 20 kt with gusts up to 35 kt after midnight. Waves around 2 ft.
Tue..W winds 15 to 20 kt with gusts up to 30 kt. Waves around 2 ft.
Tue night..NW winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft.
Wed..W winds around 10 kt. Waves 1 foot or less.
Wed 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 1011 Am Est Sat Feb 23 2019
Synopsis for massachusetts and rhode island coastal waters.. High pres moves across the waters though tonight. A warm front will approach the waters on Sun, bringing widespread rain and strong s-se winds. A cold front passes by Mon to possibly bring storm force wind gusts. Another high pres approaches from the W 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 231500
afdbox
area forecast discussion
national weather service boston norton ma
1000 am est Sat feb 23 2019

Synopsis
High pressure over the great lakes builds into new england
today, then moves offshore this evening. This will bring a
period of dry and seasonably cool weather to the region. Low
pressure then tracks along the coast Sunday with a wind-swept
rain, except freezing rain ice for the interior Sunday morning.

Strong to damaging winds develop Sunday night, peaking around
Monday, then gradually diminishing into Tuesday. A mostly quiet
week thereafter, watching a potential storm for next weekend.

Near term until 6 pm this evening
10am update...

overall forecast remains on track. Main update this morning will
be to lower temps a bit based on two issues. One is the colder
start this morning, the other is the ci shield which is
gradually becoming more dense with time. Still, seasonable highs
are expected, mainly in the low 40s and upper 30s with filtered
sunshine becoming more fully ovc as the day GOES on.

Timing of precip, etc still looks good at this time, so will not
make any changes to it with this update.

Short term 6 pm this evening through 6 pm Sunday
Looking at another round of wintry mess late tonight into
Sunday. The biggest threat will be from freezing rain, although
there could be some light snow or sleet at times, too. Have
posted a winter weather advisory where we have the greatest
confidence in light icing. Most areas should see up to a tenth
inch of icing, but could see up to two tenths towards NW ma,
where icing should persist longer. It's possible this advisory
could be expanded, should confidence in freezing rain increase
farther south and east.

Eventually warm air will win out, transitioning all
precipitation to simple rain across all of southern new england.

This rain should then persist though most of Sunday morning,
then gradually end from SW to NE during Sunday afternoon.

Winds increase late tonight into Sunday as a secondary low
pressure passes by. Gusty winds should be confined to the
immediate coast, including the CAPE and islands, through Sunday.

With lots of clouds and an increasing SE to SW flow,
temperatures should remain above normal through this period.

Long term Sunday night through Friday
* highlights ...

- strong, damaging winds starting Sun night, peaking mon
- low confidence in wet weather potential mid week & next
weekend
Sunday night through Tuesday...

strong and potentially damaging winds move in starting Sunday
night, peaking during the day Monday, and diminishing through
the day Tuesday. As the low strengthens over southeast canada
it drags a cold front through southern new england late Sunday
as the mid level trough and cold pool moves overhead. Post-
frontal winds turn out of the wnw and begin to increase as the
pressure gradient tightens on the back side of the low. Between
the deepening low and incoming high pressure this gradient
tightens bringing sustained winds up mainly after midnight and
peaking Monday afternoon 25-35 mph. At the same time good caa
aloft will promote very efficient mixing up to 700-800 mb
depending on the guidance. Either way model soundings indicate
potential for damaging wind gusts to mix down from a 55-60 kt
850mb jet. Expecting fairly widespread wind advisory criteria
with gusts of 50-55 mph. Certainly possible we could reach high
wind warning criteria in the berkshires and along the coastline
with gusts approaching 60 mph. A gale watch is in effect over
the waters, but it may well be upgraded to a storm watch soon.

Potential impacts include power outages and downed limbs trees.

After Monday afternoon evening winds decrease through the night
into Tuesday but will still be gusty given continued efficient
mixing; likely we'll see gusts 35-40 mph through Tuesday
afternoon. High temperatures drop ~10 f on Tuesday, into the
upper 20s which, with gusty winds will feel like teens to single
digits.

Wednesday through Friday...

mid level flow remains rather zonal across the CONUS for much of
late week. While models show little agreement in details beyond
Friday, no very big or impactful storms are likely. High
pressure crests on or about Wednesday with dry weather
persisting. Beyond that the GFS brings a weak clipper-like
system through Wednesday night while the ec keeps any wet
systems out of sne through the rest of the week, so trending the
forecast to a drier eps solution. Focus then shifts to late next
weekend and another potential wet system.

Aviation 15z 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 ... High confidence.

Today...VFR. Light NW winds becoming variable during the
morning as high pres moves overhead.

Tonight...VFR with dry weather through this evening, then
becoming MVFR with precipitation after midnight from west to
east. Mainly rain, except for a period of wintry mix across the
interior. Llws likely toward 12z Sunday morning along the south
coast, including CAPE cod and islands.

Sunday... MVFR ifr conditions. Windy with areas of gusts up to
30 kt. Ra ending, with some fzra possible in the early morning
across the interior. Llws likely.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Sunday night through Wednesday ...

Sunday night:VFR. Strong winds with gusts up to 45 kt. Slight
chance ra.

Monday:VFR. Strong winds with gusts up to 50 kt.

Monday night:VFR. Strong winds with gusts up to 45 kt.

Tuesday:VFR. Windy with gusts up to 35 kt.

Tuesday night:VFR. Windy with gusts up to 30 kt.

Wednesday:VFR. Breezy.

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.

High pressure builds across the waters today, then moves east
of the waters tonight. SE winds increase as a secondary low
pressure moves across southern new england on Sunday. Vsby
lowering in rain late tonight through Sunday morning. Some
improvement in visibility in the afternoon, although winds
likely to remain gusty. Could see gale force gusts across the
eastern coastal waters Sunday.

Outlook Sunday night through Wednesday ...

Sunday night: moderate risk for gale force winds with gusts up
to 45 kt. Rough seas up to 15 ft.

Monday: moderate risk for storm force winds with gusts up to
50 kt. Rough seas up to 17 ft.

Monday night: moderate risk for gale force winds with gusts up
to 45 kt. Rough seas up to 15 ft. Chance of freezing spray.

Tuesday: moderate risk for gale force winds with gusts up to
35 kt. Rough seas up to 11 ft. Chance of freezing spray.

Tuesday night: moderate risk for small craft advisory winds
with gusts up to 30 kt. Areas of rough seas. Chance of freezing
spray, slight chance of snow.

Wednesday: low risk for small craft advisory winds with gusts
up to 25 kt. Seas locally approaching 5 ft. Chance of freezing
spray, slight chance of snow.

Box watches warnings advisories
Ct... None.

Ma... Winter weather advisory from 1 am to 6 am est Sunday for
maz010>012.

Winter weather advisory from 1 am to 9 am est Sunday for
maz004-005-008-009-026.

High wind watch from Sunday evening through Monday evening for
maz002-008-009.

Winter weather advisory from 1 am to 11 am est Sunday for
maz002-003.

Ri... None.

Marine... Storm watch from late Sunday night through Monday evening for
anz231>235-237-254>256.

Gale watch from late Sunday night through late Monday night
for anz230-236.

Storm watch from Monday morning through late Monday night for
anz250-251.

Synopsis... Belk bw
near term... Doody
short term... Belk
long term... Bw
aviation... Belk bw
marine... Belk bw


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 3 mi43 min 34°F 1032.5 hPa (-0.6)
44013 - BOSTON 16 NM East of Boston, MA 24 mi53 min N 5.8 G 9.7 33°F 39°F3 ft1032.2 hPa (-0.3)24°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 31 mi99 min N 12 G 12 31°F 37°F3 ft1032 hPa
FOXR1 - 8454000 - Providence, RI 41 mi43 min E 4.1 G 6 34°F 37°F1031.9 hPa (-0.6)
PVDR1 42 mi43 min N 1.9 G 6 35°F 1032.4 hPa (-0.5)18°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 45 mi43 min NE 5.1 G 6 35°F 1032.4 hPa (-0.6)
FRVM3 - 8447386 - Fall River, MA 45 mi43 min 34°F 42°F
CPTR1 - 8452944 - Conimicut Light, RI 46 mi43 min Calm G 1.9 37°F 38°F1032.4 hPa (-0.5)
FRXM3 46 mi43 min 33°F 20°F
IOSN3 - Isle of Shoals, NH 49 mi43 min NNW 2.9 G 2.9 30°F 1031.7 hPa (-0.7)19°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA4 mi1.8 hrsN 510.00 miMostly Cloudy33°F17°F52%1032.8 hPa
East Milton, MA10 mi1.8 hrsN 4 mi29°F17°F61%1032.9 hPa
Norwood, Norwood Memorial Airport, MA12 mi1.8 hrsNNW 410.00 miFair34°F19°F54%1032.8 hPa
Laurence G Hanscom Field Airport, MA12 mi1.8 hrsN 410.00 miMostly Cloudy31°F17°F56%1034.1 hPa
Beverly, Beverly Municipal Airport, MA18 mi1.8 hrsN 510.00 miFair31°F16°F54%1032.3 hPa

Wind History from BOS (wind in knots)
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2 days agoNW7NW5W6SW5SW4S4SW8SW7S8S10S7S7S5S5SE8S6SE6SE10CalmN8N7N7NW6NW8

Tide / Current Tables for Charlestown Bridge, Charles River, Massachusetts
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Charlestown Bridge
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Sat -- 01:47 AM EST     11.27 feet High Tide
Sat -- 06:29 AM EST     Sunrise
Sat -- 07:56 AM EST     -1.24 feet Low Tide
Sat -- 09:02 AM EST     Moonset
Sat -- 02:10 PM EST     11.06 feet High Tide
Sat -- 05:26 PM EST     Sunset
Sat -- 08:21 PM EST     -1.07 feet Low Tide
Sat -- 10:27 PM EST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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8.810.811.210.285.12.1-0.4-1.2-0.21.94.77.6101110.68.86.23.30.6-1-0.71.13.5

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Sat -- 01:18 AM EST     -0.00 knots Slack
Sat -- 05:18 AM EST     -1.37 knots Max Ebb
Sat -- 06:29 AM EST     Sunrise
Sat -- 07:52 AM EST     0.00 knots Slack
Sat -- 09:02 AM EST     Moonset
Sat -- 10:54 AM EST     1.31 knots Max Flood
Sat -- 01:40 PM EST     -0.00 knots Slack
Sat -- 05:25 PM EST     Sunset
Sat -- 05:42 PM EST     -1.28 knots Max Ebb
Sat -- 08:14 PM EST     0.00 knots Slack
Sat -- 10:26 PM EST     Moonrise
Sat -- 11:20 PM EST     1.33 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.2-0.5-1-1.3-1.4-1.3-0.90.111.31.31.10.5-0.2-0.7-1.1-1.3-1.3-1-0.30.71.21.3

Weather Map and Satellite Images
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GOES Local Image of    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 (10,2,3,4)
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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.