Saturday, February24, 2018 L-36.com


Marine Weather and Tides
Boston, 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 6:24AMSunset 5:30PM Saturday February 24, 2018 2:50 AM EST (07:50 UTC) Moonrise 12:46PMMoonset 2:47AM Illumination 66% Phase: Waxing Gibbous; Moon at 9 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- 116 Am Est Sat Feb 24 2018
Rest of tonight..SW winds 10 to 15 kt with gusts up to 20 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..N winds 5 to 10 kt, becoming ne 10 to 15 kt with gusts up to 20 kt after midnight. Waves around 2 ft. A chance of rain.
Sun..E winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 30 kt. Waves 2 to 4 ft. Rain.
Sun night..N winds 5 to 10 kt, becoming nw after midnight. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. A chance of rain.
Mon..W winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance.
Mon night..NW winds 5 to 10 kt. Waves 1 foot or less.
Tue..W winds 5 to 10 kt. Waves 1 foot or less.
Tue night..W winds 5 to 10 kt. Waves 1 foot or less.
Wed..W winds around 5 kt. Waves 1 foot or less.
Wed night..S winds around 5 kt. Waves 1 foot or less. A chance of rain. 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 116 Am Est Sat Feb 24 2018
Synopsis for massachusetts and rhode island coastal waters.. A cold front will push south of the waters Saturday morning. A series of frontal systems will sweep across the waters through the weekend. High pres builds over the waters early next week. 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 Boston, MA
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location: 42.36, -71.02     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 240553
afdbox
area forecast discussion
national weather service taunton ma
1253 am est Sat feb 24 2018

Synopsis
A weak wave of low pressure moves offshore tonight followed by
drier air later tonight into Saturday. Another frontal system
will bring more rain and interior mixed precipitation Saturday
night and Sunday. A near-seasonable, quiet pattern for early
next week.

Near term until 6 am this morning
1250 am update...

low clouds persist across the region with areas of fog,
especially along the coast. Expect partial clearing to develop
early this morning, but stratus and patchy fog may linger along
the south coast.

Short term 6 am this morning through 6 pm Sunday
Saturday...

dry weather returns Saturday as a high pressure builds into the
region from the nw. Lingering fog is possible after 12z along
the southern coast, but should quickly burn off due to surface
heating. Clouds will continue clearing, with most of the
interior seeing periods of Sun by midday. With NW flow, temps
will reach well into the 50s across the interior and coasts.

Cooler upper 40s over higher elevations NW ma.

Saturday night... Rain showers expected after midnight, with a
chance of higher elevation seeing freezing rain and sleet just
before sunrise.

Long term Sunday night through Friday
Highlights...

* widespread precip on Sunday with wintry mix in the interior
* dry and above average for early next week
* stormy pattern emerging for the beginning of march
overview...

12z guidance is in general agreement with the extended forecast.

Just some minor differences related to thermals which provide
different outcomes in p-type for late Saturday night into Sunday.

Deamplifying trough across the CONUS as potent shortwave moves up
into the great lakes bringing occluded system and triple point low
into southern new england on Sunday. Afterwards high pressure and
strong ridge takes hold over the eastern CONUS by early next week.

The GEFS and eps continue to show anomolous high pressure building
over greenland which will influence a cut-off low to either
retrograde towards the maritimes or remain across the north
atlantic. This all due to the nao turning negative by early march.

While the pattern begins to jam up, digging shortwave out of the
southern plains on Thursday needs to be watch as it could be the
first of several waves impacting southern new england.

Details...

late Saturday night into Sunday... Moderate confidence.

Potent wave will eject out of the desert southwest producing a
surface low pressure system up into the northern great lakes.

Stalled front to the south will begin to lift northward as a warm
front. This will result into another overrunning precip set-up as
moisture from the south increases as warm front begins to lift
northward. Surface high pressure will be set-up north to northeast
of the region allowing for surface temps to fall. Triple point low
developing along the stalled front, will reinforce the cold air
especially in the 950-925mb layer leading to cooler temps at the
surface, ESP across the high terrain.Models are always to quick at
warming temps above freezing, so trended towards cooler 2m temps and
wet-bulb effects.

P-type will once again be the issue as models are still struggling
with the warm layer. Ec continues to remain on the cold side with
the 12z NAM as the warmest. GFS cmc and now 18z NAM are in the
middle of the ground and thus trended towards the ensembles
guidance. As with the prev forecaster, kept a bit of snow sleet at
the onset, as cold air looks to be deep enough north of the pike and
esp route 2. In fact with good omega in the snow growth region,
could see a few inches of snowfall. Once the mid-level warm front
pushes into the region, a transition to more freezing rain event
will occur leading to slick travel across the interior. Highest
confidence will be across the east slope of the berkshires and the
worcester hills as the higher terrain locations will see the coolest
surface temps. This is due to warm layer remaining around 800mb.

Cannot rule out northern ct and the higher terrain of ri for some
wintry weather impacts, but confidence is higher across northern ma.

South of the pike and especially across ri and SE ma conditions look
to warm for any wintry weather, but still will have to watch as a
change in just a few degrees will impact p-type.

This system continues to be quite robust resulting in more
widespread precip, ESP as we continue to tap into that gulf
moisture. Pwat values are around 2-3 std above normal for this time
of year. When this system is all said and done, could see about an
inch across the south coast with a half of an inch near the ma nh
border. Guidance from nerfc suggest that the rivers should remain
within their banks, but may need to watch some of the flashier
streams.

Lastly, with the surface warm front trying to push northward, may
have a large gradient in surface temperatures somewhere across
southern new england. While warm fronts tend to struggle to lift
northward this time of year something to watch as we could see low
50s across the south coast and mid 30s across the interior.

Sunday night into Wednesday... High confidence.

Surface cold front will push through the region resulting in a
drying trend for Sunday night. Strong high pressure over the ohio
valley will begin to strengthen Monday into Tuesday as anomolous ridge
sets-up over the mississippi valley. This high appears to stay in
place into middle of next week before a quick moving wave from the
southwest gets kick into the flow. Thanks to ridging and surface
high, dry weather will prevail as temperatures turn slightly above
average.

Thursday and beyond... Low confidence.

To many pieces to the puzzle to have confidence in the forecast for
the end of the week. Approaching shortwave from the southern plains
will spawn a surface low, just uncertain on its direction and
location as it will depend on large scale features downstream.

Aviation 06z 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.

Through 12z... MVFR ifr conditions will gradually improve toVFR
from north to south through 12z, but ifr persisting over the
islands.

Today... Stratus and patchy fog may linger for a few hours past
12z along immediate south coast and especially the islands.

OtherwiseVFR. A brief period of showers may move across
portions of N ct and ri and SE ma late in the day and early
evening.

Tonight...VFR in the evening, lowering to MVFR from west to east
late. Rain, sleet and freezing rain developing from SW to ne
well after midnight with snow sleet across northern ma. Mainly
rain mixed with sleet coastal plain.

Sunday... Widespread ifr lifr developing. Rain, mixed with sleet
at times in the morning in the coastal plain. Snow, sleet and
freezing rain changing to rain interior.

Kbos terminal... High confidence in trends. Conditions improving
toVFR early this morning, but exact timing may be off a few
hours.

Kbdl terminal... High confidence in trends. Conditions improving
toVFR early this morning, but exact timing may be off a few
hours.

Outlook Sunday night through Wednesday ... Moderate confidence.

Sunday night: mainlyVFR, with local ifr possible. Slight
chance ra.

Monday through Wednesday:VFR.

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.

Tonight... Winds shifting to west with gusts up to 20 kt. Areas
of fog will limit vsbys over south coastal waters.

Saturday... Diminishing westerly winds becoming northerly in the
evening. SCA might be needed for the southern waters early
Saturday where seas reach 5 feet.

Outlook Sunday night through Wednesday ...

Sunday: low risk for gale force winds with gusts up to 35 kt.

Areas of rough seas. Rain.

Sunday night: winds less than 25 kt. Seas up to 5 ft. Chance of
rain.

Monday: winds less than 25 kt. Seas up to 5 ft.

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

Tuesday: winds less than 25 kt. Seas locally approaching 5 ft.

Tuesday night through Wednesday: winds less than 25 kt.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 2 mi50 min 41°F 1015.9 hPa (-3.0)
44013 - BOSTON 16 NM East of Boston, MA 20 mi60 min WSW 14 G 18 41°F 40°F2 ft1016.2 hPa (-3.9)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 27 mi106 min 16 G 18 38°F 40°F3 ft1015.8 hPa
FOXR1 - 8454000 - Providence, RI 43 mi50 min WNW 7 G 13 41°F 40°F1018 hPa (-2.1)
PVDR1 44 mi50 min W 8.9 G 12 42°F 1018.5 hPa (-2.4)42°F
FRVM3 - 8447386 - Fall River, MA 46 mi50 min 41°F 40°F1019 hPa (-2.1)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi50 min SW 11 G 13 41°F 1017.8 hPa (-2.1)
FRXM3 47 mi50 min 41°F 40°F
IOSN3 - Isle of Shoals, NH 47 mi50 min WSW 18 G 19 37°F 1015.2 hPa (-3.5)36°F
CPTR1 - 8452944 - Conimicut Light, RI 48 mi50 min WSW 14 G 18 41°F 41°F1018.6 hPa (-2.1)
BGXN3 - Great Bay Reserve, NH 49 mi65 min WSW 4.1 35°F 1016 hPa35°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA1 mi56 minWSW 1310.00 miFair40°F37°F93%1016.8 hPa
East Milton, MA11 mi54 minSW 14 G 21 mi0°F0°F%1016.3 hPa
Norwood, Norwood Memorial Airport, MA14 mi57 minSW 810.00 miA Few Clouds42°F39°F89%1017.4 hPa
Bedford, Hanscom Field, MA16 mi54 minSW 610.00 miPartly Cloudy38°F37°F97%1018.1 hPa
Beverly, Beverly Municipal Airport, MA16 mi57 minWSW 910.00 miMostly Cloudy39°F37°F93%1016.1 hPa

Wind History from BOS (wind in knots)
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Last 24hrNW7N6N6N5N5N4N4E5E15E13E12E11E11SE10SE7S12--S6SW7SW7SW9SW11SW7W13
1 day agoNW13N14N10N8N8N6NE10E14NE8NE12NE8NE10NE10NE8N5CalmSE3E3N6N3N6N7N3N3
2 days agoSW9SW8SW10S11SW13SW19
G27
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SW19S17SW10SW13S11S13SW12SW14W12NW11
G20
N13N12N13NW15
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NW13

Tide / Current Tables for Charlestown, Charles River, Massachusetts
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Charlestown
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Sat -- 01:46 AM EST     Moonset
Sat -- 05:19 AM EST     10.18 feet High Tide
Sat -- 06:27 AM EST     Sunrise
Sat -- 11:47 AM EST     Moonrise
Sat -- 11:50 AM EST     0.11 feet Low Tide
Sat -- 05:27 PM EST     Sunset
Sat -- 06:00 PM EST     8.96 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.235.27.39.110.19.98.66.54.32.30.60.11.12.84.86.88.398.475.13.21.6

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Sat -- 01:20 AM EST     1.23 knots Max Flood
Sat -- 01:46 AM EST     Moonset
Sat -- 04:56 AM EST     -0.00 knots Slack
Sat -- 06:27 AM EST     Sunrise
Sat -- 08:10 AM EST     -1.07 knots Max Ebb
Sat -- 11:46 AM EST     Moonrise
Sat -- 11:54 AM EST     0.00 knots Slack
Sat -- 01:54 PM EST     1.11 knots Max Flood
Sat -- 05:27 PM EST     Sunset
Sat -- 05:32 PM EST     -0.00 knots Slack
Sat -- 08:43 PM EST     -0.92 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.71.21.210.6-0-0.6-0.9-1.1-1-0.9-0.70.10.91.110.80.4-0.3-0.7-0.9-0.9-0.9-0.7

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 (2,6,7,8)
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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.