Monday, July24, 2017 L-36.com


Marine Weather and Tides
Somerville, 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 5:28AMSunset 8:13PM Monday July 24, 2017 4:50 PM EDT (20:50 UTC) Moonrise 6:50AMMoonset 9:09PM Illumination 2% Phase: Waxing Crescent; 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- 334 Pm Edt Mon Jul 24 2017
.small craft advisory in effect until 2 am edt Tuesday...
Tonight..NE winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 25 kt. Waves 2 to 4 ft. Showers, mainly this evening. Patchy fog this evening with vsby 1 to 3 nm.
Tue..N winds 5 to 10 kt. Waves around 2 ft. A chance of showers.
Tue night..N winds around 5 kt. Waves 1 foot or less.
Wed..N winds around 5 kt, becoming E in the afternoon. Waves 1 foot or less.
Wed night..S winds around 5 kt. Waves 1 foot or less.
Thu..SW winds 5 to 10 kt. Waves 1 foot or less. A chance of showers.
Thu night..SW winds 5 to 10 kt. Waves 1 foot or less. Areas of fog. A chance of showers. Vsby 1 to 3 nm.
Fri..S winds around 5 kt. Waves 1 foot or less. Areas of fog. Showers likely. Vsby 1 to 3 nm.
Fri night..N winds around 5 kt. Waves 1 foot or less. Areas of fog. A chance of showers. Vsby 1 to 3 nm.
Sat..N winds around 5 kt. Waves 1 foot or less.
Sat night..NW 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 334 Pm Edt Mon Jul 24 2017
Synopsis for massachusetts and rhode island coastal waters.. Low pres will track south of the waters this evening. High pres follows for Wed but will slide east of the waters by Thu. A cold front will then cross the waters sometime Fri with high pressure for Sat and Sun. 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 Somerville, MA
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location: 42.37, -71.07     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 242002
afdbox
area forecast discussion
national weather service taunton ma
402 pm edt Mon jul 24 2017

Synopsis
Widespread rain gradually moves offshore this evening. However,
the cool and damp conditions remain into Tuesday. High pressure
will bring a return to dry and pleasant weather for Wednesday.

Cold front with a surface low pressure wave approaches southern
new england Thursday night and exits the area late Friday. Dry
weather and seasonable temperatures expected next weekend.

Near term until 6 am Tuesday morning
Widespread rainfall was confined to the eastern half of southern
new england late this afternoon, with much more spotty showers
farther west. Expecting this rainfall to move offshore this
evening as a low pressure moves farther from our region.

Cold and damp weather will stick around through much of
tonight. Cannot rule out some showers or patchy drizzle.

Temperatures will continue to slowly fall through this evening.

Short term 6 am Tuesday morning through Tuesday night
A little better start to Tuesday. Despite clouds lingering to
start the day, we should see a drying and clearing trend during
the afternoon, and especially Tuesday night, as a high pressure
arrives from the north.

With winds expected to be more from the north than east, max
temperatures should be noticeably higher during the day than
Monday, but still below normal. Below normal temperatures
continue Tuesday night.

Long term Wednesday through Monday
Highlights...

* dry weather and seasonable temperatures on Wednesday
* showers and possible thunderstorms late Thu with showers
likely lingering into fri
* dry weather and seasonable temperatures likely for the weekend
overview...

ridge builds over the intermountain west while the eastern
united states looks susceptible to troughing. An anomalously
strong short wave trough for this time of year will cross the
great lakes region on Thu and new england on fri. There is
considerable disagreement between the GFS and ECMWF operational
runs and ensemble output regarding strength of this short wave
trough. Dry weather should follow in the NW flow behind the
short wave passage for the weekend when there is much better
consensus among the medium range models. There is also fairly
reasonable model consensus on 850 mb temperatures for the
weekend time period with resultant surface temperatures likely
near seasonable levels. With a few tweaks in the Thu and fri
period, have gone close to a model consensus for the longer term
forecast period.

Period of focus... Thursday afternoon into Friday
the one period of extra focus in the longer term period covers
Thursday afternoon through Friday when operational and ensemble
model disparities result in somewhat below average confidence on
the outcome. All models depict the short wave trough passage
but vary considerably in strength and some in timing. The ecmwf
suite of model runs depict a much stronger and as one might
expect slower system than the GFS suite of model runs. Timing
could also play a role in convective potential on the front end
late Thursday afternoon and evening. Have opted to go close to
continuity with pops and just a tad below model consensus due to
model discrepancies. Nevertheless, do believe there will be
enough energy to support likely pops in most areas. Also,
adjusted temperatures down just a little across northern ma from
a straight model consensus due to a high probability of
cloudiness and at least scattered showers. If the latest ecmwf
run proves to be correct, then we will probably need to lower
those high temperatures on Friday at least a little more and
raise pops.

As the short wave trough approaches and the 500 mb heights
begin to fall, the air mass becomes marginally unstable late
Thursday, mainly across western and northern ma and do have a
chance of thunder in the gridded forecast. The slower timing
scenarios, however, would bring the forcing into the region well
past the favorable diurnal time. There is relatively strong
vertical shear as one might expect to be associated with a
robust short wave trough, but the degree of instability remains
something of a question mark. For now, have high chance or low
likely showers and slight chance or chance thunder. We'll be
able to refine this as we get closer.

Aviation 20z Monday through Saturday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday night ... Moderate confidence.

Through 00z... MVFR-ifr conditions.

Tonight... Still mostly ifr cigs, lowest across high terrain
terminals, with -shra dz. Winds turning n, strongest along E ma
coast sustained around 15 kt with gusts up to 25 kt.

Tuesday into Tuesday night...

improving trends. MVFR-ifr mix gradually lifting, especially
Tuesday night. Still a bit breezy along the east coast with
sustained winds up around 10 kt and gusts up to 20 kt Tuesday,
diminishing Tuesday night.

Kbos terminal... Ne winds back farther N tonight. Ifr CIGS for
much of the night. Moderate confidence in timing for
improvement to MVFR.

Kbdl terminal... Low conditions persisting through roughly midday
Tuesday.

Outlook Wednesday through Saturday ...

Wednesday through Thursday morning...VFR.

Late Thursday afternoon through Friday... MVFR ceilings and
visibilities in areas of showers. Isolated thunderstorms late
Thursday afternoon and evening.

Saturday...VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday night ...

low pressure moves farther away from the waters tonight, backing
winds from northeast to north across most of the waters. Reduced
visibility in rain and fog. Rain diminishes this evening, but fog
and spotty drizzle likely to linger through daybreak Tuesday.

Small craft advisory for most waters continues, concluding late
Tuesday into Tuesday night as winds subside and seas diminish.

Outlook Wednesday through Saturday ...

conditions during most of the period will likely remain below
small craft advisory thresholds. However, this is a risk that
winds and seas may approach 25 knots and 5 feet, respectively, in
an increasing SW flow Thursday afternoon and a northerly flow
Friday afternoon and night, depending upon the strength of a low
pressure area that passes across new england and the gulf of maine
on Friday.

Tides coastal flooding
Continued strong NE flow continues tonight with sustained winds
around 10 to 15 mph with gusts upwards of 30 mph. This yields a
surge upwards of a foot for locations along the E ma coast N of a
low sweeping W to E along the waters south of new england.

A coastal flood advisory continues for the evening high tide
accordingly, given surge on top of high astronomical high tides.

Climate
Here is where we stand for record low maximum temperatures for the
calendar day.

Record MAX temperature
boston 63 - 1904 65
hartford 67 - 1997 68
providence 67 - 1997 66 * probable new record
worcester 60 - 1964 61

Box watches warnings advisories
Ct... None.

Ma... Coastal flood advisory from 11 pm this evening to 3 am edt
Tuesday for maz007-015-016-019-022-024.

Ri... None.

Marine... Small craft advisory until 5 pm edt this afternoon for
anz232>234.

Small craft advisory until 2 am edt Tuesday for anz230.

Small craft advisory until 2 pm edt Tuesday for anz231-251.

Small craft advisory until 9 am edt Tuesday for anz235-237.

Small craft advisory until 8 pm edt Tuesday for anz250.

Small craft advisory until 3 am edt Wednesday for anz254.

Small craft advisory until 2 am edt Wednesday for anz255-256.

Synopsis... Belk thompson
near term... Belk
short term... Belk
long term... Thompson
aviation... Belk thompson
marine... Belk thompson
tides coastal flooding... Staff
climate... Staff


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 1 mi51 min 58°F 1011 hPa (-0.4)
44013 - BOSTON 16 NM East of Boston, MA 22 mi61 min NNE 23 G 29 58°F 65°F7 ft1011.1 hPa (-0.0)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 29 mi107 min NE 23 G 27 58°F 63°F7 ft1011.3 hPa
FOXR1 - 8454000 - Providence, RI 43 mi51 min NE 14 G 20 60°F 69°F1009.8 hPa (-0.4)
PVDR1 44 mi51 min NNE 12 G 19 59°F 1010.2 hPa (-0.4)56°F
FRVM3 - 8447386 - Fall River, MA 46 mi51 min 60°F 73°F1010 hPa (-1.0)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi51 min NNE 17 G 25 61°F 1008.7 hPa (-1.0)
FRXM3 47 mi51 min 61°F 60°F
CPTR1 - 8452944 - Conimicut Light, RI 47 mi51 min N 16 G 22 60°F 72°F1010.2 hPa (-0.5)
IOSN3 - Isle of Shoals, NH 48 mi51 min NE 23 G 27 58°F 1012.5 hPa (-1.3)56°F
BGXN3 - Great Bay Reserve, NH 49 mi66 min ENE 5.1 57°F 1014 hPa56°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA2 mi57 minNNE 15 G 221.50 miRain Fog/Mist58°F57°F100%1012.1 hPa
East Milton, MA11 mi55 minNE 18 G 32 miBreezy55°F54°F96%1012.2 hPa
Norwood, Norwood Memorial Airport, MA14 mi58 minNE 91.50 miLight Rain Fog/Mist59°F57°F93%1011.5 hPa
Bedford, Hanscom Field, MA14 mi55 minNE 122.00 miLight Rain Fog/Mist58°F55°F90%1013.5 hPa
Beverly, Beverly Municipal Airport, MA17 mi58 minNE 12 G 191.50 miLight Rain Fog/Mist58°F57°F97%1011.9 hPa

Wind History from BOS (wind in knots)
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Last 24hrE10E10E9E8SE6SE5SE4--SE4CalmNE3E5E8E8E8E12E13E17E18NE19NE11
G23
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NE15NE15
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1 day agoSE6E4E3SE5S6S5S3W6NW5SE3N9NE17NE20
G28
NE15NE13NE13NE16NE13NE12E13NE12E12E11E10
2 days agoW8W12W11
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W12
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W11W11W10W12W12
G19
W10W10W9W9W9W9NW7NW8NW3NE4SE5SE5E7E10E8

Tide / Current Tables for Charlestown Bridge, Charles River, Massachusetts
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Charlestown Bridge
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Mon -- 12:04 AM EDT     12.08 feet High Tide
Mon -- 05:29 AM EDT     Sunrise
Mon -- 06:28 AM EDT     -1.68 feet Low Tide
Mon -- 06:50 AM EDT     Moonrise
Mon -- 12:43 PM EDT     10.68 feet High Tide
Mon -- 06:43 PM EDT     -0.68 feet Low Tide
Mon -- 08:11 PM EDT     Sunset
Mon -- 09:08 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
12.111.49.56.83.50.4-1.4-1.40.22.65.68.410.310.69.67.54.82-0.2-0.60.83.16.19

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Mon -- 03:47 AM EDT     -1.46 knots Max Ebb
Mon -- 05:28 AM EDT     Sunrise
Mon -- 06:15 AM EDT     0.00 knots Slack
Mon -- 06:50 AM EDT     Moonrise
Mon -- 09:28 AM EDT     1.42 knots Max Flood
Mon -- 12:11 PM EDT     -0.00 knots Slack
Mon -- 04:19 PM EDT     -1.34 knots Max Ebb
Mon -- 06:37 PM EDT     0.00 knots Slack
Mon -- 08:11 PM EDT     Sunset
Mon -- 09:08 PM EDT     Moonset
Mon -- 09:48 PM EDT     1.38 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.3-0.8-1.2-1.4-1.5-1.2-0.30.81.31.41.40.90.1-0.5-0.9-1.2-1.3-1.3-0.70.41.11.31.41.1

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 (16,3,4,5)
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Ground Weather Radar Station Boston, MA
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weather_mapweather_map weather_map

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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.