Monday, April23, 2018 L-36.com


Marine Weather and Tides
Somerville, 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 5:47AMSunset 7:36PM Monday April 23, 2018 5:34 AM EDT (09:34 UTC) Moonrise 12:39PMMoonset 2:28AM Illumination 56% Phase: First Quarter Moon; Moon at 8 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- 343 Am Edt Mon Apr 23 2018
Today..N winds around 5 kt, becoming se this afternoon. Waves 1 foot or less.
Tonight..S winds 5 to 10 kt. Waves 1 foot or less.
Tue..S winds 5 to 10 kt. Waves 1 foot or less.
Tue night..S winds 5 to 10 kt. Waves 1 foot or less. A chance of showers.
Wed..SE winds 5 to 10 kt. Waves around 2 ft. Areas of fog. Showers. Vsby 1 to 3 nm.
Wed night..S winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft. Areas of fog. Showers. Vsby 1 to 3 nm.
Thu..SW winds 5 to 10 kt. Waves around 2 ft. A chance of showers.
Thu night..W winds 5 to 10 kt. Waves around 2 ft.
Fri..S winds 5 to 10 kt. Waves around 2 ft.
Fri night..S winds 5 to 10 kt with gusts up to 20 kt. Waves around 2 ft. A chance of showers. 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 343 Am Edt Mon Apr 23 2018
Synopsis for massachusetts and rhode island coastal waters.. High pressure over the waters today will shift east by Tuesday. Low pressure will move up the eastern seaboard Tuesday night and Wednesday bringing fog and showers, then crossing the waters by Thursday morning. Another storm will be moving up along the coast Friday 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

7 Day Forecast for Marine Location Near Somerville, MA
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location: 42.37, -71.07     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 230829
afdbox
area forecast discussion
national weather service boston norton ma
429 am edt Mon apr 23 2018

Synopsis
High pressure remains in control through Tuesday bringing dry
weather with moderating temperatures. Low pressure will pass
through new england late Wednesday and bring showers to the
area. Another weak low pressure center may bring another round
of showers to the area Friday night.

Near term until 6 pm this evening
High pressure remains in place over southern new england. Expect
lots of sunshine and light wind. Mixing again should reach to at
least 850 mb and possibly higher than 800 mb. Note that inland
mixing yesterday reached above 750 mb. Temps at 850 mb support
max sfc temps of 62-64f, while 800 mb temps support 65-68f. We
tend toward the higher values inland, especially in the
traditional hot spots... Hartford-springfield and parts of the
boston metrowest.

The light flow will support sea breezes along the coast, which
will keep temps cooler along the coast. Will maintain MAX temps
in the 60s inland and 50s coast.

Short term 6 pm this evening through 6 pm Tuesday
The high pressure remains overhead tonight, then shifts off to
the east Tuesday. This should maintain clear skies tonight, and
sunshine through high clouds Tuesday.

Radiational cooling tonight should again allow temperatures to
fall into the 30s, with the usual cold spots around freezing or
a little below.

With the surface high moving offshore, Tuesday will feature a
developing south to southwest wind which will allow a sea breeze
only along the south-facing coasts. The ridge will maintain dry
air through the day. High level moisture fields do indicate
increasing clouds during the mid to late afternoon, but late
enough to allow sunshine through the day. Mixing will be a
little shallower, but temps at all levels will be increasing. So
temperatures Tuesday should again climb into the 60s except 50s
along the south coast.

Long term Tuesday night through Sunday
Highlights...

* showers Wednesday into Wednesday night
* another round of showers possible Friday night and late Saturday
discussion...

multiple short wave energy systems will be affecting our area during
this forecast period. A southern stream short wave trough and
surface low will affect southern new england late Tuesday night into
Wednesday night. This system begins to phase with a northern stream
short wave as it passes through our region. Still another southern
stream short wave and an associated weak surface low pressure center
may affect the area around Friday night, but consistency in handling
this feature among the medium range models is low. This system
currently looks as though it will will run a little ahead of an
approaching northern stream trough which then becomes a dominant
feature with possibly cooler temperatures for the rest of the
weekend. There is a signal for a long wave pattern change leading to
higher heights and warmer temperatures across our region after this
forecast period.

Tuesday night to Wednesday night...

the 00z operational model runs have converged some on timing for the
southern stream short wave energy during this time period. As the
mid tropospheric southern stream short wave begins to phase with the
northern stream short wave, the surface weather pattern may take on
the look of a surface low that moves north up the mid atlantic
coastal plain and ends up with the look of a triple point low
passing over or near central new england. Suspect that cooler air
will be somewhat resistant to an approaching warm front due to
onshore maritime polar air being fed on E to SE winds. Anticipate
rainfall will be showery but confident that all areas will measure.

Pwats look to crest about 1.2 to 1.4 inches, and a 50 to 60+ knot
low level SE jet at 925 mb will help focus that moisture over
southern new england. There also looks to be some elevated
instability Wednesday evening with embedded convection a
possibility. This is reflected on the latest GFS run with mid level
lapse rates of 6.5 to 7 degrees c km as well as other typical
instability indices such as showalters a little below 0, total
totals of 50+ and k indices above 30.

As far as qpf, may see some upslope enhancement given the nose of
the SE low level jet across the worcester hills and or east slopes
of the berkshires depending upon the exact track of the low level
features. Suspect that rainfall amounts could end up higher than
model output due to subtropical moisture source, strength of the low
level jet, and some convective enhancement but variable due to the
showery nature. A preliminary estimate would be a fairly widespread

5 to 1 inch amounts with locally higher spot amounts of 1 5 to
possibly 2 inches.

Thursday through Friday...

except for possibly widely scattered late Thursday afternoon or
early evening instability showers over the NW higher terrain, it
looks dry Thursday afternoon through at least most of Friday.

Confidence has increased of at least most of daytime Friday
remaining dry.

Friday night system...

the second southern stream short wave upper trough with a weak
surface low passing along or off the coast may produce showers
across at least some of southern new england, but confidence is low
due to poor model consensus on this feature. The new 00z ECMWF keeps
this system far offshore, although some of its ensemble members have
it passing very near SE new england. Thus, given the uncertainty, we
will just indicate low chance pops for now. There is also some
uncertainty as to how much interaction, if any, with an approaching
northern short wave trough.

Rest of weekend...

a cold front associated with the northern stream trough may result
in scattered showers late Saturday, but there's no real model
consensus on that now so confidence is low. That northern stream
short wave trough brings cooler temperatures to southern new england
for the latter half of the weekend into Monday of next week.

Aviation 09z 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.

Vfr. Light W NW winds today with sea breezes developing along
the coasts toward midday afternoon, then dissipating in the
evening. Light south winds tonight and Tuesday.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Tuesday night through Friday ... High confidence.

Tuesday night: becoming mainly MVFR after midnight, with local
ifr possible toward daybreak. Shra spreading into the area after
midnight.

Wednesday: mainly ifr with shra and areas br. Areas of MVFR
conditions possible during the afternoon. Potential for llws.

Becoming windy along the coast with local gusts to 30 kt during
the afternoon. Shra and areas br.

Wednesday night: mainly MVFR, with local ifr possible. Windy
with gusts to 30 kt in the evening. Shra diminishing overnight.

Isolated tstms during the evening.

Thursday: mainlyVFR, with local MVFR possible over higher
terrain. Breezy. Slight chance shra over NW higher terrain.

Thursday night and Friday: mainlyVFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday ... High confidence.

High pressure over the waters today with light winds, flat
seas, and good visibility. The high moves off to the east
tonight and Tuesday, with winds turning from the south by
Tuesday, but remaining light.

Only concern for recreational boaters is for sea breezes along
the coastline today with 15-20kt gusts and choppy seas near
shore, especially when opposing outgoing tide.

Outlook Tuesday night through Friday ... High confidence.

Tuesday night: winds less than 25 kt. Seas locally approaching
5 ft. Chance of rain showers. Local visibility 1 to 3 nm.

Wednesday: small craft advisory winds possible with gusts up to
30 kt possible. Low risk of gale force gusts, especially south
and east of nantucket. Areas of rough seas above 5 feet,
especially over the exposed south coastal waters. Rain showers,
areas fog. Visibility 1 to 3 nm.

Wednesday night: small craft advisory winds possible with gusts
up to 30 kt. Low risk of gale force gusts east of CAPE cod. Rough
seas up to 13 ft over the outer coastal waters. Rain showers.

Thursday: winds less than 25 kt, but areas of seas at or above 5
feet.

Thursday night: winds less than 25 kt. Local rough seas around 5
feet.

Friday: winds less than 25 kt. Areas of seas approaching 5 feet
over the outer south coastal waters. Slight chance of rain
showers late.

Equipment
Noaa weather radio transmitters serving providence and hyannis
are out of service due to phone line problems. The phone
company has prioritized the issues and is working to get the
weather broadcast back on the air as soon as possible.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Wtb thompson
near term... Wtb
short term... Wtb
long term... Thompson
aviation... Wtb thompson
marine... Wtb thompson
equipment...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 1 mi52 min 48°F 1029.6 hPa
44013 - BOSTON 16 NM East of Boston, MA 22 mi44 min NNW 5.8 G 5.8 44°F 44°F1 ft1029 hPa (+1.0)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 29 mi90 min 44°F 43°F1 ft1028.4 hPa
FOXR1 - 8454000 - Providence, RI 43 mi52 min N 2.9 G 4.1 44°F 45°F1030.3 hPa
PVDR1 44 mi46 min NNW 4.1 G 4.1 42°F 1030.8 hPa26°F
FRVM3 - 8447386 - Fall River, MA 46 mi52 min 40°F 47°F1030.9 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi46 min NNE 2.9 G 2.9 40°F 1029.8 hPa
CPTR1 - 8452944 - Conimicut Light, RI 47 mi46 min NNW 6 G 7 43°F 47°F1030.4 hPa
FRXM3 47 mi46 min 38°F 34°F
BGXN3 - Great Bay Reserve, NH 49 mi109 min ENE 1 32°F 970 hPa28°F

Wind History for Providence, RI
(wind in knots)    EDIT      (on/off)   Help
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N3
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G14
NE5
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G16
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NW8
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N7
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G26
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G12
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G9

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA2 mi40 minNW 510.00 miFair45°F19°F37%1030.7 hPa
East Milton, MA11 mi38 minNNW 7 mi41°F17°F38%1031.2 hPa
Norwood, Norwood Memorial Airport, MA14 mi41 minN 010.00 miFair34°F30°F89%1031 hPa
Bedford, Hanscom Field, MA14 mi38 minN 010.00 miFair30°F26°F85%1032.2 hPa
Beverly, Beverly Municipal Airport, MA17 mi41 minN 010.00 miFair32°F26°F79%1030.1 hPa

Wind History from BOS (wind in knots)
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Last 24hrW9NW9NW8NW10W11NW10
G16
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G17
W11
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N9
G19
E11SE12E10E6E5S3CalmN3N6N7N8N6N4NW5
1 day agoW11W10NW13W11NW10
G19
NW9
G18
NW11
G18
--NW11
G21
NW15
G24
W11
G15
N10
G21
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N10N6N5E3N6N5NW4W5W8W8
2 days agoW12W12NW15
G21
NW18
G27
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G21
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G24
NW15
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G25
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G30
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G25
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G25
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G21
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G20
NW10W9NW10W10W10W12W11

Tide / Current Tables for Charlestown Bridge, Charles River, Massachusetts
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Charlestown Bridge
Click for Map
Mon -- 02:27 AM EDT     Moonset
Mon -- 05:50 AM EDT     10.39 feet High Tide
Mon -- 05:50 AM EDT     Sunrise
Mon -- 12:18 PM EDT     -0.09 feet Low Tide
Mon -- 12:39 PM EDT     Moonrise
Mon -- 06:38 PM EDT     9.40 feet High Tide
Mon -- 07:35 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.92.24.26.38.49.910.49.67.95.73.31.2-00.31.73.55.77.89.29.38.56.94.92.8

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Mon -- 01:35 AM EDT     1.05 knots Max Flood
Mon -- 02:27 AM EDT     Moonset
Mon -- 05:15 AM EDT     -0.00 knots Slack
Mon -- 05:50 AM EDT     Sunrise
Mon -- 09:58 AM EDT     -0.98 knots Max Ebb
Mon -- 12:13 PM EDT     0.00 knots Slack
Mon -- 12:38 PM EDT     Moonrise
Mon -- 02:15 PM EDT     0.96 knots Max Flood
Mon -- 05:58 PM EDT     -0.00 knots Slack
Mon -- 07:34 PM EDT     Sunset
Mon -- 10:42 PM EDT     -0.88 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.4110.90.70.2-0.4-0.7-0.9-1-1-0.8-0.20.610.90.90.6-0-0.4-0.7-0.8-0.8-0.9

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.