Tuesday, May23, 2017 L-36.com


Marine Weather and Tides
Boston, 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 5:13AMSunset 8:09PM Tuesday May 23, 2017 4:43 AM EDT (08:43 UTC) Moonrise 4:04AMMoonset 5:29PM Illumination 6% Phase: Waning Crescent; Moon at 27 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
    EDIT      (on/off)   Help
ANZ230 Boston Harbor- 414 Am Edt Tue May 23 2017
Today..N winds 5 to 10 kt...becoming E this afternoon. Waves 1 foot or less. Patchy fog this morning with vsby 1 nm or less.
Tonight..SE winds around 5 kt. Waves 1 foot or less.
Wed..E winds around 5 kt...increasing to 5 to 10 kt in the afternoon. Waves 1 foot or less.
Wed night..SE winds around 5 kt. Waves 1 foot or less.
Thu..E winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves 2 to 4 ft. Patchy fog. Showers likely. Vsby 1 nm or less.
Thu night..NE winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 2 to 4 ft. Patchy fog. Showers. Vsby 1 to 3 nm.
Fri..N winds 5 to 10 kt. Waves 1 foot or less... Except 2 to 4 ft at the outer harbor entrance. Showers.
Fri night..NW winds around 5 kt. Waves 1 foot or less. A chance of showers.
Sat..NW winds around 5 kt. Waves 1 foot or less.
Sat night..SW winds around 5 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 414 Am Edt Tue May 23 2017
Synopsis for massachusetts and rhode island coastal waters.. Coastal low will move into the north atlantic today as weak high pressure builds over the waters. Another coastal low will move across the benchmark tonight followed by another high pressure system on Wednesday. A potent low pressure system will move over the area late Thursday into Friday. Followed by quiet weather for the weekend. 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
   Hourly   EDIT   Help
location: 42.36, -71.02     debug


Area Discussion for - Boston, MA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 kbox 230809
afdbox
area forecast discussion
national weather service taunton ma
409 am edt Tue may 23 2017

Synopsis
Drying trend develops today with sunshine and seasonable
temperatures. Another wave of low pressure tracks south of new
england brining a period of rain to the south coast late tonight
into Wed morning followed by another dry and seasonable
afternoon on wed. A more potent area of low pressure impacts
the region Thu and Fri with widespread showers and cooler
temperatures. Dry weather and seasonable temperatures return for
the holiday weekend as weak high pressure builds into the area.

However the weather pattern remains progressive with the next
round of wet weather possible Sunday night into Monday.

Near term /until 6 pm this evening/
400 am update...

surface frontal system currently over the canal will continue to
move eastward early this morning. Bulk of the heavy rainfall has
pushed offshore as dry air begins to spill into the area. Looking
downstream, a few heavier rain showers could clip the outer
cape/nantucket early this morning, but otherwise dry weather will
prevail.

Aside from the rain, fog is beginning to be an issue. Locations
within the connecticut valley are starting to drop, with a few sites
down to 1sm. May have to watch for the potential of dense fog as
winds become light and clouds continue to break resulting in
radiational cooling. Will hold off on dense fog advisory for now.

Today...

weak surface low will be well offshore this morning with mid-level
frontal system still stalled over southern new england. Weak mid and
low level riding will develop over the area today. This will help
break up cloud cover resulting in diurnal heating. Temperatures will
warm into the 70s with cooler conditions along the coastline.

Dry weather will prevail for most of the day with high level clouds
passing through by the late afternoon hours, ahead of the next
weather system.

Short term /6 pm this evening through 6 pm Wednesday/
Tonight...

digging shortwave across the midwest will push a weak disturbance
over the mid-atlantic. A coastal low will develop in response and
move into southern new england along a stalled front tonight.

Overall models have come into above average agreement with the
evolution of the trough and closed low as it progresses east. The
00z NAM is a bit of an outlier compared to the remainder of the
guidance. Therefore trended closer to the rgem, ec and gfs.

As this system moves into the region, showers will overspread across
southern ri and SE ma. Right now it appears that the highest qpf
over the CAPE and islands. Model guidance may be a bit underdone on
the QPF amounts as guidance indicated that the low will close at
700mb resulting in a good fgen area northwest of the low. This may
spread precip farther north and thus have adjusted pops to indicate
the potential trend.

Wednesday...

showers will come to an end by the morning hours on Wednesday as the
system continues to move eastward. Northeast winds will gust during
the morning hours across the CAPE and islands due to tight pressure
gradient from building high pressure and passing coastal low. Gusts
will be near 15 to 25 mph.

Upper and mid level ridge will build into the area during the day
resulting in a drying trend. Overall, a great day as temperatures
will warm into the mid to upper 70s as skies clear out. Cooler along
the eastern coastline as sea breezes may develop.

Long term /Wednesday night through Monday/
Highlights...

* widespread rain Thu and Fri with locally heavy downpours possible
* mainly dry Sat and Sun then risk of more showers Sun ngt/mon
* cool Thu and Fri but more seasonable Sat and sun
details...

Thursday... Closed low over the oh valley yields deep moist southerly
flow into new england with mid level warm front ovespreading the
region during the afternoon. This is accompanied by fairly robust
mid level jet (50 kts) for late may coupled with pwats of up to +2
sd from climo. Thus some heavier downpours possible. Could be some
embedded thunder as well as nose of mid level dry slot approaches
and steepens mid level lapse rates.

Modest easterly low level jet up to 40 kt will provide some
windswept rain as well. This onshore flow combined with precip
and ssts in the low to mid 50s will hold temps down.

Friday... Vertically/occluded low over the region with surface low
likely tracking along or just off the south coast. This will result
in scattered showers especially during the morning hours. Could be
some locally heavy downpours given strengthening mid level low. This
track will also keep warm sector offshore and another day of cool
temps. Although some temp recover to near 70 across ct as conditions
improve from southwest to northeast.

Holiday weekend... Closed low moves into the maritimes with rising
heights and associated subsidence overspreading the area Saturday,
providing a real nice day with highs in the 70s. Most of the
guidance keeps dry weather here thru Sun except the GFS which
appears on the fast side of the envelope. By Sun ngt and Mon next
northern stream trough and associated moisture will overspread our
area, thus increasing the chance of showers. Temps seasonable
sat and sun, likely a bit cooler Mon given cloud cover.

Aviation /08z Tuesday through Saturday/
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term /through Wednesday/...

before 12z... Moderate confidence. Ifr/MVFR conditions will
improve toVFR from west to east. Patchy dense fog is possible
across ct valley terminals.

Today... High confidence. MainlyVFR across the region. Sea
breezes possible on coastlines.

Tonight... Moderate confidence. MainlyVFR with MVFR/ifr across
the south coast, CAPE and islands in passing showers from
coastal low. Gusty NE winds to near 20 kts is possible near
daybreak.

Wednesday... High confidence. Improving trend toVFR.

Kbos taf... High confidence in taf.

Kbdl taf... Moderate confidence in TAF due to fog development
early this morning.

Outlook /Thursday through Saturday/... Moderate to high forecast
confidence.

Wed night...VFR likely and dry.

Thursday and Friday... Widespread showers in ifr/MVFR.

Saturday... Drying trend along withVFR conditions.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term /through Wednesday/... High confidence.

Weak high pressure will build across the waters today as showers
continue to move eastward. Another coastal low will develop
across the mid-atlantic and move over the waters tonight.

Visibilities could drop in heavy rainfall. Improving conditions
by Wednesday as high pressure builds in the area. Despite the
active weather, seas will remain below 4 feet and gusty
northeast winds Wednesday morning will remain around 20-25 kts.

Sca may be needed, but confidence is low.

Outlook /Wednesday night through Saturday/...

Thursday... Ene winds 20-30 kt with strongest winds late in the day
and evening with low risk of low end gales. Vsby poor in rain and
fog.

Friday... Winds light and variable in the morning as high pres crest
over the area. Vsby poor in showers and fog but improving as the day
progresses as winds become more northwest.

Tides/coastal flooding
High astronomical tides will occur over several tide cycles along
eastern massachusetts coast from Thursday into memorial day, with
tides around 12 feet in boston and 4 feet on nantucket.

At the very least, minor nuisance flooding will occur in the most
vulnerable locations such as morrissey blvd in boston. Any surge on
top of these tides would lead to more widespread, but minor,
coastal flooding, including on nantucket. Right now, this looks
to be a possibility Thursday into Friday due to expected onshore
winds. Model surge guidance (estofs) shows a potential 0.6 ft
surge, which would give a storm tide near 13 feet Thursday
night in boston and just under 5 ft on nantucket.

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

Ma... None.

Ri... None.

Marine... None.

Synopsis... Nocera/dunten
near term... Dunten
short term... Dunten
long term... Nocera
aviation... Nocera/dunten
marine... Nocera/dunten/nmb
tides/coastal flooding...



Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 2 mi44 min 53°F 56°F1013.4 hPa (-0.9)
44013 - BOSTON 16 NM East of Boston, MA 20 mi54 min N 9.7 G 12 52°F 53°F2 ft1012.3 hPa (-1.4)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 27 mi100 min NNE 7.8 G 9.7 52°F 53°F2 ft1012.6 hPa
FOXR1 - 8454000 - Providence, RI 43 mi44 min NNE 6 G 8.9 55°F 59°F1012.4 hPa (-0.0)
PVDR1 44 mi44 min N 8.9 G 11 55°F 1012.8 hPa (-0.0)54°F
FRVM3 - 8447386 - Fall River, MA 46 mi44 min 57°F 58°F1013.2 hPa (-0.6)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi44 min NNW 7 G 8.9 57°F 1011.9 hPa (-0.5)
FRXM3 47 mi44 min 57°F 56°F
IOSN3 - Isle of Shoals, NH 47 mi44 min NNW 5.1 G 6 49°F 1013 hPa (-1.3)49°F
CPTR1 - 8452944 - Conimicut Light, RI 48 mi44 min NNW 13 G 14 55°F 59°F1012.9 hPa (-0.4)
BGXN3 - Great Bay Reserve, NH 49 mi59 min NW 1 51°F 1014 hPa51°F

Wind History for Providence, RI
(wind in knots)    EDIT      (on/off)   Help
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
Last
24hr
SW4
SW6
SW4
G7
S7
S10
G13
S11
G15
SW10
G14
S11
G15
S10
G14
S12
S13
G17
SW10
G13
S6
G10
S10
S8
G13
S7
G11
S8
S7
G10
SW8
G14
S4
S1
NE4
NE9
NE6
G9
1 day
ago
N2
W2
NW3
NE2
E3
E1
S6
G9
S8
S6
S7
S11
S13
G17
S16
G20
S18
G22
S17
G21
S14
G19
S7
SW7
SW8
SW4
G9
SW6
SW4
G7
SW6
SW5
G8
2 days
ago
E7
NE11
G15
NE10
G15
E9
G13
E7
G10
E10
G14
NE12
G16
E9
G14
E5
G10
E6
G10
S4
G7
SE5
G9
S11
SW11
G16
SW9
G15
S8
S7
G10
SW5
G10
W4
SW6
W4
SW1
NW4
G7
NW6
G9

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA1 mi50 minNW 410.00 miOvercast53°F52°F96%1013.5 hPa
East Milton, MA11 mi48 minNNW 7 mi51°F50°F96%1014.2 hPa
Norwood, Norwood Memorial Airport, MA14 mi51 minNW 410.00 miOvercast54°F52°F93%1013.5 hPa
Bedford, Hanscom Field, MA16 mi48 minWNW 410.00 miOvercast52°F48°F89%1014.7 hPa
Beverly, Beverly Municipal Airport, MA16 mi51 minN 310.00 miOvercast53°F52°F96%1012.5 hPa

Wind History from BOS (wind in knots)
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
Last 24hrSW6SW8SW6S8S7S9S7
G16
E5E7S9
G16
SE7SE10S11S9S8SE5SE4NE3N7N5N5N5NW5NW4
1 day agoN3NE4N4NE9NE11E10E9E10E10E12E13E13E11E12E12SE10SE8S7S10SW7SW9SW7SW9SW5
2 days agoN8N8N10NE14NE13E13E13E16E12SE12E11E10E9E9E10SE6SE6S9SW7S6SW8W9SW7SW6

Tide / Current Tables for Charlestown, Charles River, Massachusetts
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Charlestown
Click for Map
Tue -- 03:31 AM EDT     -0.28 feet Low Tide
Tue -- 04:04 AM EDT     Moonrise
Tue -- 05:15 AM EDT     Sunrise
Tue -- 09:39 AM EDT     10.29 feet High Tide
Tue -- 03:50 PM EDT     -0.30 feet Low Tide
Tue -- 05:28 PM EDT     Moonset
Tue -- 08:07 PM EDT     Sunset
Tue -- 10:01 PM EDT     11.35 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.43.91.5-0-0.11.43.66.18.41010.29.17.14.72.30.3-0.30.93.25.88.410.511.310.7

Tide / Current Tables for Boston Harbor, Massachusetts Current
   EDIT      (on/off)   Help   One Week of Data
Boston Harbor
Click for Map
Tue -- 12:25 AM EDT     -1.31 knots Max Ebb
Tue -- 03:33 AM EDT     0.00 knots Slack
Tue -- 04:03 AM EDT     Moonrise
Tue -- 05:15 AM EDT     Sunrise
Tue -- 05:54 AM EDT     1.35 knots Max Flood
Tue -- 09:17 AM EDT     -0.00 knots Slack
Tue -- 12:43 PM EDT     -1.30 knots Max Ebb
Tue -- 03:54 PM EDT     0.00 knots Slack
Tue -- 05:28 PM EDT     Moonset
Tue -- 06:19 PM EDT     1.47 knots Max Flood
Tue -- 08:06 PM EDT     Sunset
Tue -- 09:44 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.3-1.3-1.2-0.60.51.21.31.310.2-0.5-1-1.2-1.3-1.2-0.80.11.11.51.41.30.6-0.2-0.8

Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Northeast    EDIT
Geos

Wind Forecast for Boston, MA (4,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Boston, MA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.