Monday, March27, 2017 L-36.com


Marine Weather and Tides
Chelsea, MA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:31AMSunset 7:06PM Monday March 27, 2017 10:26 PM EDT (02:26 UTC) Moonrise 6:30AMMoonset 6:42PM Illumination 0% Phase: New Moon; Moon at 1 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- 717 Pm Edt Mon Mar 27 2017
Tonight..N winds 5 to 10 kt. Waves 1 foot or less. A slight chance of showers this evening. Areas of drizzle after midnight. Areas of fog after midnight. Vsby 1 to 3 nm... Decreasing to 1 nm or less after midnight.
Tue..E winds around 5 kt. Waves 1 foot or less. Areas of fog. A chance of showers with areas of drizzle. Vsby 1 nm or less.
Tue night..E winds around 5 kt...becoming N after midnight. Waves around 2 ft. Showers likely. Vsby 1 to 3 nm.
Wed..N winds 5 to 10 kt...increasing to 10 to 15 kt in the afternoon. Gusts up to 20 kt. Waves around 2 ft.
Wed night..NW winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft.
Thu..N winds 5 to 10 kt. Gusts up to 20 kt in the morning. Waves around 2 ft.
Thu night..N winds around 5 kt. Waves around 2 ft.
Fri..E winds around 5 kt. Waves 1 foot or less. A chance of rain.
Fri night..SE winds 5 to 10 kt. Waves around 2 ft. Rain likely.
Sat..E winds 5 to 10 kt. Waves 2 to 4 ft. Rain likely.
Sat night..N winds 5 to 10 kt. Waves 2 to 4 ft. 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 717 Pm Edt Mon Mar 27 2017
Synopsis for massachusetts and rhode island coastal waters.. A warm front will remain south of the coastal through Tuesday as another low tracks across southern new england tonight. Strong high pressure over quebec builds S into new england Wednesday into Thursday. More unsettled weather is in the forecast for late Friday into Saturday followed by high pressure Sunday into 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 Chelsea, MA
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location: 42.37, -71.06     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 272354
afdbox
area forecast discussion
national weather service taunton ma
754 pm edt Mon mar 27 2017

Synopsis
Damp weather continues Tue and Tue night as low pressure tracks
over or near the region. Although Tue should be milder than
Monday. High pressure brings dry but chilly weather Wed and thu.

More unsettled weather is expected late Fri into sat. High
pressure builds in Sunday into early next week.

Near term /through Tuesday/
00z update...

much of forecast looks on track. The nearly stationary front at
23z extended along the south coastal new england shoreline,
northeastward through the CAPE cod canal. Weak surface low
circulation was along the front and near the CAPE cod canal,
moving ne. Radar at 23z showed the back edge of scattered
showers at the CAPE cod canal, and should push east of cape
cod/islands by 02z.

One unknown continues to be the extent of dense fog overnight.

Will continue to monitor conditions, but with calm winds and
plenty of moisture, areas of fog are likely.

Lows above freezing all locations in the mid to upper 30s.

Short term /Tuesday night through 6 pm Tuesday/
Tuesday... Over-running with light rain or drizzle. Temps near
50 for highs. Warm front south of long island with plenty of
mixture keeps it cloudy and damp. Pops of likely to
categorical, but the key here is for light rain which I was able
to get into the grids.

Not a lot of sunshine anticipated, despite southern new england
getting into the warm sector of a low pressure in southeast
canada. MAX temperatures should be above normal, in the upper
40s and 50s. Could be warmer if clouds and rainfall are delayed
until late in the day. Low risk of a isolated thunderstorm or
two toward the south coast due to elevated instability.

Long term /Tuesday night through Monday/
No significant changes at this time.

Highlights...

* showers linger Tuesday night as cold front passes through
* cooler but dry weather for Wed and thurs
* unsettled weather returns Friday into Saturday
pattern overview...

12z model consensus continues to show an active weather pattern
for the period. Split flow aloft will continue through the
period with a few shortwaves moving through the flow. Partial
phasing of the two streams will occur across the great lakes and
northeast on Tuesday. This will result in the development of a
low pressure system east of the region late Tuesday into
Wednesday. High pressure and upper level ridge will follow
Thursday into early Friday. The next upper level low/trough
deamplifies as it moves into the mid/upper ridge axis across the
eastern u.S. A coastal low is forecast to develop and quickly
move east in the aforementioned region of this phasing. The
spread has decreased for this timeframe but the still question
in strengthen and location of this system will determine p-types
and QPF amounts.

Details...

Tuesday night... High confidence.

Weak shortwave will move over the region on Tuesday with surface
low pressure over northern new england. Along the cold front,
guidance develops a secondary low pressure system just south of
southern new england by Tuesday night. This wave of low pressure
will bring showery weather Tuesday evening into the overnight
hours. Cannot rule out some isolated thunder with this system as
tt increase above 50 and li's drop below 0. This is strongest
in the conservative ec.

Precip chance will quickly come to an end from west to east
during the overnight hours as CAA takes a hold of the region.

Wednesday into Friday... High confidence.

Trough overhead as upper level low deepens as it moves towards
the canadian maritimes. This puts the region in northwest flow
through the period resulting in dry but breezy conditions.

Clouds may be stubborn on Wed over the CAPE and islands given
northerly flow across the waters. In fact could have some ocean
effect rain/snow showers over the outer cape! Despite cold
advection, the environment should be well mixed, so max
temperatures will be close to normal.

Northwest flow continues on Thursday with an area of high
pressure building in new england. Anticipate increasing
sunshine and lighter winds. Dry and seasonable conditions should
persist through Friday with high pressure in control.

Friday night into the weekend... Low confidence.

Split flow remains over the region with the next southern stream
wave interacting with the northern stream. Still some model
spread in this system leading to a low confidence forecast. The
ec has become more progressive with this approaching coastal low
developing it over 1-95 while the GFS keeps the system
suppressed. The UKMET is more in between the two systems, but
the GEFS and eps continue to show the system south of sne.

Overall a chilly rain with potential for wet snow/sleet at times
on the northern portion of the precip shield. All guidance
suggest system should be or moving offshore by Sunday, thus
drying trend possible second half of the weekend.

Aviation /00z Tuesday through Saturday/
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term /through Tuesday/... High confidence.

Tonight... Ifr to lifr CIGS remain. Fog develops/remains
overnight. Light winds.

Tuesday... Ifr conditions likely in areas of rain and fog. Chance
for lifr.

Kbos taf... Moderate confidence. Ifr to lifr through much of the
period.

Kbdl taf... Moderate confidence. Ifr to lifr through much of the
period.

Outlook /Tuesday night through Saturday/...

Wednesday into Thursday... High confidence. Gusty n/w winds
Wednesday withVFR conditions into Thursday.

Friday... Moderate confidence. VFR and dry to start but likely
lowering to MVFR or possibly ifr Fri night in rain/wintry precip.

Saturday... Moderate confidence. MVFR or possibly lower in rain/wintry mix.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term /through Tuesday/... Moderate confidence.

Rough seas across the eastern outer coastal waters are more
likely than the southern outer waters. Continued the small craft
advisories for those waters. A few gusts to 25 kt are also
possible this evening.

Tonight... A weak frontal boundary sweeps the waters, with light
west winds developing. This will allow seas to subside and small
craft advisories to conclude.

Tuesday... Light south winds with frontal boundary north of the
region. Vsby reduced at times in rain and fog.

Outlook /Tuesday night through Saturday/...

Tuesday night... Moderate confidence. Winds becoming northeast late
tue night as front slips south and wave of low pres tracks along the
front south of new england. Vsby reduced at times in rain and fog.

Wednesday into Thursday... High confidence. Gusty north winds near
Wednesday into early Thu then diminishing as high pressure builds
into the area later thu.

Friday... High confidence. Quiet weather with high pressure over the
area early fri. However increasing east-southeast winds Fri night as
low pres approaches from the west. Also vsby lowering in rain and
fog Fri night.

Box watches/warnings/advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory until 2 am edt Tuesday for anz250-254.

Small craft advisory until 11 pm edt this evening for anz255-
256.

Synopsis... Staff
near term... Nmb/staff
short term... Staff
aviation... Nmb/staff
marine... Staff


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 1 mi38 min 39°F 37°F1017 hPa
44013 - BOSTON 16 NM East of Boston, MA 22 mi36 min NNW 18 G 19 38°F 40°F4 ft1016.2 hPa (+0.7)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 28 mi82 min NNW 18 G 21 38°F 39°F5 ft1014.9 hPa
FOXR1 - 8454000 - Providence, RI 43 mi38 min NE 2.9 G 7
PVDR1 44 mi38 min N 7 G 11 42°F 1016.6 hPa41°F
FRVM3 - 8447386 - Fall River, MA 46 mi44 min 42°F 39°F1017.2 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi38 min N 6 G 8.9 42°F 1017.1 hPa
FRXM3 47 mi38 min 42°F 42°F
IOSN3 - Isle of Shoals, NH 47 mi26 min N 15 G 17 36°F 1016.9 hPa (+1.2)36°F
CPTR1 - 8452944 - Conimicut Light, RI 48 mi38 min NNW 12 G 13 41°F 40°F1016.7 hPa
BGXN3 - Great Bay Reserve, NH 49 mi101 min N 1.9 37°F 1018 hPa37°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA2 mi32 minN 910.00 miOvercast39°F37°F93%1017.2 hPa
East Milton, MA11 mi32 minN 6 mi37°F37°F100%1017.6 hPa
Norwood, Norwood Memorial Airport, MA14 mi33 minNNW 54.00 miFog/Mist41°F39°F93%1017.2 hPa
Bedford, Hanscom Field, MA14 mi90 minN 63.00 miFog/Mist39°F35°F86%1018.3 hPa
Beverly, Beverly Municipal Airport, MA16 mi33 minN 510.00 miOvercast37°F37°F100%1016.7 hPa

Wind History from BOS (wind in knots)
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Last 24hrSE10SE6SE7E8E9E10E9--E10E11E11E7E6E5N4N65NW5N5N5N9N9N8N9
1 day agoNW7NW6N8N5N7N8N8N9N8N8NE14E13E12E14E13E12E10E11E10E10E9SE11SE11SE11
2 days agoW7
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SW7SW7W4SW5NW6N8N3N6N4N9NE7NE8NE7NE7NE7N7E3N6N7N4N5N4NW5

Tide / Current Tables for Charlestown Bridge, Charles River, Massachusetts
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Charlestown Bridge
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Mon -- 05:20 AM EDT     -0.40 feet Low Tide
Mon -- 06:30 AM EDT     Moonrise
Mon -- 06:35 AM EDT     Sunrise
Mon -- 11:32 AM EDT     10.83 feet High Tide
Mon -- 05:45 PM EDT     -0.82 feet Low Tide
Mon -- 06:42 PM EDT     Moonset
Mon -- 07:04 PM EDT     Sunset
Mon -- 10:59 PM EDT     New Moon
Mon -- 11:56 PM EDT     10.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
9.88.36.13.51.1-0.3-01.74.16.79.110.610.79.47.24.51.8-0.3-0.80.52.85.58.110.1

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Mon -- 02:45 AM EDT     -1.33 knots Max Ebb
Mon -- 05:22 AM EDT     0.00 knots Slack
Mon -- 06:30 AM EDT     Moonrise
Mon -- 06:34 AM EDT     Sunrise
Mon -- 08:09 AM EDT     1.37 knots Max Flood
Mon -- 11:07 AM EDT     -0.00 knots Slack
Mon -- 02:44 PM EDT     -1.38 knots Max Ebb
Mon -- 05:43 PM EDT     0.00 knots Slack
Mon -- 06:42 PM EDT     Moonset
Mon -- 07:04 PM EDT     Sunset
Mon -- 08:22 PM EDT     1.48 knots Max Flood
Mon -- 10:59 PM EDT     New Moon
Mon -- 11:33 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.7-1.1-1.3-1.3-1.1-0.40.71.31.41.30.90.1-0.6-1.1-1.3-1.4-1.3-0.70.31.21.51.51.20.5

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 (22,6,7,8)
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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.