Tuesday, January16, 2018 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 7:08AMSunset 4:40PM Tuesday January 16, 2018 4:31 AM EST (09:31 UTC) Moonrise 7:42AMMoonset 5:28PM Illumination 0% Phase: New Moon; Moon at 29 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- 403 Am Est Tue Jan 16 2018
Today..NW winds 5 to 10 kt, becoming sw this afternoon. Waves 1 foot or less, except 3 to 5 ft at the outer harbor entrance.
Tonight..S winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. Snow. Vsby 1 nm or less.
Wed..E winds 5 to 10 kt, becoming N in the afternoon. Waves 1 foot or less. Snow with rain likely. Vsby 1 nm or less.
Wed night..NW winds 5 to 10 kt. Gusts up to 20 kt after midnight. Waves around 2 ft. A chance of snow.
Thu..W winds 5 to 10 kt with gusts up to 20 kt. Waves around 2 ft.
Thu night..W winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves around 2 ft.
Fri..W winds 5 to 10 kt. Waves 1 foot or less.
Fri night..SW winds 5 to 10 kt. Waves 1 foot or less.
Sat..SW winds 5 to 10 kt with gusts up to 20 kt. Waves 1 foot or less.
Sat night..SW winds 5 to 10 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 403 Am Est Tue Jan 16 2018
Synopsis for massachusetts and rhode island coastal waters.. High pres will push offshore today. Low pres will develop off the mid atlc coast late today, then will push across the waters tonight and Wed. Another high will build S of the waters Thu through Sat. 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 160856
afdbox
area forecast discussion
national weather service taunton ma
356 am est Tue jan 16 2018

Synopsis
Low pressure moves east from the great lakes today, then redevelops
off the mid atlantic coast before tracking across SE new england
Wednesday. This will bring the potential for several inches of snow
to the region, mainly Tuesday night into Wednesday afternoon, but a
changeover to rain is likely Wednesday across portions of rhode
island and southeast massachusetts. Mainly dry weather likely
Thursday into Sunday, with a warming trend during the weekend.

Another low pressure system may affect our region early next week
with mostly rain.

Near term until 6 pm this evening
1015 pm update...

continue to see spotty freezing drizzle across portions of
plymouth and western barnstable counties at 03z, as well as some
mixed precip at kpvc. Band of light precip still skirting along
the E coast of plymouth county as seen on latest kbox 88d radar
imagery, though starting to shrink in coverage as the back edge
appears to be from W of kghg-kpym.

Due to the continuance of the freezing drizzle, have extended
the winter weather advisory for eastern plymouth county for a
few more hours. Also included barnstable county, felt it was
enough to include them for a few hours mainly across the lower
cape. Should see precip taper off by around 1 am.

Winds are slowly backing to 350-360 degrees, so should see drier
air work eastward. However, solid low level cloud deck
continues across the region, though gradually increasing across
the ct valley at 03z. Temps look to remain steady or maybe fall
a few degrees through the remainder of the night.

Previous discussion...

Tuesday...

should see cloudy skies early Tuesday morning with light north
winds. Approaching system from the west will help flip wind to a
more southerly direction by the afternoon hours. Guidance
continues to suggest more or a southwest flow aloft as WAA moves
in the region. This will help keep the region socked in with
clouds, however temperatures do warm into the low to mid 30s.

Within this warm advection pattern, snow showers will break out
across the area with some moderate lift in the snow growth
region. The Tuesday evening commute may be impacted especially
across western ma but the bulk of this system will occur Tuesday
night into Wednesday. See the short term section for more
details.

Short term 6 pm this evening through 6 pm Wednesday
Tuesday night through Wednesday...

upper trough over the eastern usa with jet core 130-145 knots.

The trough axis maintains a progressive orientation through
midweek. The right entrance region of the jet moves near the
carolina coast Tuesday evening, which will generate cyclogenesis
along the coast. The resulting coastal low will then move up the
coast overnight and pass CAPE cod and islands Wednesday
afternoon evening.

Cross sections show some initial elevated lift early Tuesday
night, but the best and deepest lift over southern new england
runs from after midnight until midday Wednesday. This will be
the best time for accumulating snow. There are differences among
the models regarding the track of the storm center. The NAM and
gfs are slower and pass about 70 miles inside 40n 70w, while the
ggem and ECMWF are about 6 hours faster and pass directly over
cape cod. We favored the offshore track.

Qpf continues to be expected in the 0.40 to 0.75 inch range,
with snow to liquid ratios of between 12 and 15 to 1 in the
interior and 10 to 12 to 1 in much of ri and southeast ma. This
supports 6 inches or higher over much of the region, with
diminishing amounts south of a boston-hartford line due to
temperatures near freezing along with a mix or change to rain.

This brings the heaviest snow over interior southern new
england, affecting an area broader than the current watch.

We have expanded the existing winter storm watch to include
northern ct, NW ri, and norfolk suffolk counties in ma.

Long term Wednesday night through Monday
Highlights...

* cold and dry Thursday
* continued dry with a warming trend through the weekend
* another storm may bring mostly rain Monday
Wednesday night and Thursday...

coastal low over the gulf of maine Wed evening will lift into the
maritimes. Some lingering light snow eastern new eng is possible
early as sharp mid level trough swings through, otherwise drying
with gradual clearing overnight. Thursday looks dry and cold with a
mix of Sun and clouds. Somewhat breezy as well with gusty NW winds
at times. Temps in the mid 20s to lower 30s.

Friday through Sunday...

looks mainly dry though the weekend. Moderating trend begins fri
with temps recovering to near seasonable normals then a mild day sat
with temps in the 40s. Some uncertainty with temps Sun which will
depend on a possible frontal passage. ECMWF further south with
northern stream shortwave across SE canada which drives cold front
through with high pres building to the north, while
gfs ggem UKMET keep boundary to the north and mild temps. We
leaned toward milder consensus of the guidance, but will have to
monitor this trend as ECMWF would suggest some ice potential on
front end of next shot of precip late Sun night early mon.

Monday...

amplified mid level trough and cold front approaches from the west
with decent pre-frontal low level jet moving into the region. Timing
this far out is uncertain but a period of rain appears likely
sometime Mon into Mon night. One caveat is ECMWF would suggest some
mixed precip ice would be possible at the onset with cold high pres
to the ne.

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 ...

overnight... Moderate to high confidence in taf. Patchy -sn -fzdz
across eastern plymouth county to CAPE cod should wind down by
around 06z. Mixture of MVFR to low endVFR CIGS with lowest
conditions across eastern ma including the CAPE and the islands.

Tuesday... Moderate confidence in taf. AnyVFR will fall to MVFR
cigs through the day. Light snow showers will over spread the
region by the afternoon ESP across western ma.

Tuesday night-Wednesday... Mainly ifr lifr CIGS vsbys in snow,
with areas of heavy snow north of a bos-hfd line. Snow may mix
with or change to rain south of a marshfield-providence-westerly
line. Conditions improve toVFR in ct and western mass Wednesday
afternoon... And in ri and eastern central mass Wednesday night.

Wind gusts 25 to 30 knots around nantucket and parts of cape
cod.

Thursday...VFR. Northwest winds gust to 25 knots CAPE cod and
islands, with gusts to 20 knots elsewhere.

Kbos terminal... Moderate confidence in taf. Should remain snow
free, but cannot rule out a few flurries during the evening
push.

Kbdl terminal... High confidence in taf.

Outlook Wednesday night through Saturday ...

Wednesday night: mainlyVFR, with local ifr possible in the
evening. Breezy. Slight chance sn.

Thursday through Saturday:VFR. Breezy.

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.

Overnight into Tuesday... N-ne winds overnight with gusts near
20 kts will diminish by the morning as they shift to se. Sca
has been expanded as seas will remain about 5 feet or higher.

Tuesday night... S-se winds with gusts to 25 knots. Seas 5 feet
on the outer waters. Mixed snow and rain developing. Visibility
4 to 6 nm. Small craft advisory may be needed.

Wednesday... Easterly winds with gusts 20 to 30 knots. A few
gusts to 35 knots possible southeast of nantucket. Seas 5 to 7
feet on the outer waters and possibly on the ri waters. Rain and
snow will diminish in the afternoon. Visibility 2 to 4 miles.

Small craft advisory may be needed. Low chance of a gale warning
southeast of nantucket.

Wednesday night... Winds turning from northwest at 20 to 25
knots. Seas remain at 5 to 7 feet on the outer waters. Snow
tapers off at this time. Small craft advisory may be needed.

Thursday... Northwest winds gusting to 25 knots. Seas remain 5 to
7 feet on the outer waters. Small craft advisory may be needed.

Outlook Wednesday night through Saturday ...

Wednesday night: winds less than 25 kt. Areas of rough seas.

Slight chance of snow.

Thursday: low risk for small craft advisory winds with gusts up
to 25 kt. Areas of rough seas.

Thursday night: low risk for small craft advisory winds with
gusts up to 25 kt. Local rough seas.

Friday: winds less than 25 kt. Local rough seas.

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

Saturday: moderate risk for small craft advisory winds with
gusts up to 25 kt. Local rough seas.

Hydrology
Minor flooding continues along taunton and pawcatuck rivers
where flood warnings remain in effect. A flood warning is also
in effect for the connecticut river at hartford and middle
haddam, where ice is causing some river fluctuations.

Colder weather will persist through midweek which will limit
additional runoff, although we should see some building of snow
pack for much of region Tuesday into Wednesday.

For details on specific area rivers, including observed and
forecast river stages, please visit the advanced hydrologic
prediction service AHPS graphs on our website.

Box watches warnings advisories
Ct... Winter storm warning from 1 am to 6 pm est Wednesday for
ctz004.

Winter storm warning from 7 pm this evening to 3 pm est
Wednesday for ctz002-003.

Ma... Winter weather advisory from 1 am to 1 pm est Wednesday for
maz017>019.

Winter storm warning from 1 am to 6 pm est Wednesday for
maz004>007-012>016-026.

Winter storm warning from 7 pm this evening to 3 pm est
Wednesday for maz002-003-008>011.

Winter weather advisory from 1 am to 9 am est Wednesday for
maz020-021.

Ri... Winter weather advisory from 1 am to 1 pm est Wednesday for
riz002>004.

Winter storm warning from 1 am to 6 pm est Wednesday for
riz001.

Winter weather advisory from 1 am to 9 am est Wednesday for
riz005>007.

Marine... Small craft advisory until 5 pm est this afternoon for anz231.

Small craft advisory until 6 pm est Wednesday for anz250-
254>256.

Small craft advisory until 1 am est Wednesday for anz251.

Synopsis... Kjc
near term... Evt
short term... Wtb
long term... Kjc
aviation... Kjc evt
marine... Kjc evt
hydrology...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 1 mi43 min 21°F 1032.8 hPa
44013 - BOSTON 16 NM East of Boston, MA 22 mi41 min N 12 G 16 27°F 42°F9 ft1032.5 hPa (+0.7)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 29 mi87 min 14 G 16 27°F 40°F10 ft1032 hPa
FOXR1 - 8454000 - Providence, RI 43 mi49 min NE 8 G 9.9 22°F 33°F1033.2 hPa
PVDR1 44 mi43 min N 7 G 8.9 1033.5 hPa
FRVM3 - 8447386 - Fall River, MA 46 mi49 min 23°F 34°F1033.4 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi43 min N 5.1 G 7 23°F 1032.2 hPa
FRXM3 47 mi43 min 23°F 15°F
CPTR1 - 8452944 - Conimicut Light, RI 47 mi43 min N 9.9 G 12 22°F 32°F1033.1 hPa
IOSN3 - Isle of Shoals, NH 48 mi31 min N 11 G 14 20°F 1033.3 hPa (+0.5)17°F
BGXN3 - Great Bay Reserve, NH 49 mi106 min N 1.9 1034 hPa

Wind History for Providence, RI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE10
G14
NE9
G14
NE10
G20
NE10
G18
NE11
G18
NE10
G15
NE12
G18
NE10
G16
NE11
G20
NE14
G20
NE13
G19
NE10
G15
NE11
G16
NE9
G15
NE13
G16
N10
NE10
G14
N10
NE7
G11
NE8
NE5
NE8
G12
NE8
NE5
G10
1 day
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NE12
G20
NE10
G16
N11
G16
NE12
G16
NE6
G18
NE10
G16
NE11
G15
NE6
G12
NE11
G15
NE10
G14
NE11
G14
E10
G15
NE8
G13
NE8
G11
NE9
NE6
G9
NE9
G14
NE8
G14
NE9
G13
NE7
G13
N9
G13
NE8
G13
NE10
G16
NE9
G13
2 days
ago
S20
G26
SW18
G26
SW22
G34
SW16
G25
SW17
G24
SW11
G20
NW17
G24
N15
G27
N16
G24
N11
G23
N11
G14
N13
G20
N12
G18
NW15
G20
NE12
G17
N15
G20
NE10
G17
NE14
G21
N15
G19
NE14
G18
NE8
G13
NE15
G25
N12
G19

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA2 mi37 minNNW 610.00 miOvercast21°F12°F71%1033.5 hPa
East Milton, MA11 mi95 minNNW 7 mi18°F12°F77%1033.8 hPa
Norwood, Norwood Memorial Airport, MA14 mi38 minN 310.00 miOvercast24°F12°F60%1033.7 hPa
Bedford, Hanscom Field, MA14 mi95 minNNW 410.00 miOvercast20°F8°F60%1035.1 hPa
Beverly, Beverly Municipal Airport, MA17 mi38 minNNW 610.00 miOvercast21°F14°F74%1033.2 hPa

Wind History from BOS (wind in knots)
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Last 24hrN14
G22
N14N12N12
G19
N15N16N14NW10N12NW11NW10N10N11N12N10NW10NW9N7NW10NW10NW9N7NW5NW6
1 day agoNW14NW14NW13NW13NW11NW11NW9NW6N7N6N7N6NW6N7N10N10NW8N10N11N11N12N13N14N17
2 days agoS15S12S21S30
G38
S20
G30
SW22
G31
W19
G31
W18
G28
W16
G24
W18
G27
W16
G21
NW13
G22
NW17
G22
NW15
G23
NW15
G23
NW16
G22
NW17NW12NW17NW16
G21
NW12
G19
NW15
G23
NW15
G23
NW13
G21

Tide / Current Tables for Charlestown Bridge, Charles River, Massachusetts
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Charlestown Bridge
Click for Map
Tue -- 04:32 AM EST     1.02 feet Low Tide
Tue -- 06:41 AM EST     Moonrise
Tue -- 07:10 AM EST     Sunrise
Tue -- 10:47 AM EST     10.13 feet High Tide
Tue -- 04:28 PM EST     Moonset
Tue -- 04:38 PM EST     Sunset
Tue -- 05:08 PM EST     0.05 feet Low Tide
Tue -- 09:18 PM EST     New Moon
Tue -- 11:22 PM EST     8.97 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.16.74.72.61.21.22.23.968.29.810.19.37.85.63.110.10.51.83.65.97.98.9

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Tue -- 02:30 AM EST     -1.21 knots Max Ebb
Tue -- 04:31 AM EST     0.00 knots Slack
Tue -- 06:41 AM EST     Moonrise
Tue -- 07:09 AM EST     Sunrise
Tue -- 07:54 AM EST     1.13 knots Max Flood
Tue -- 10:28 AM EST     -0.00 knots Slack
Tue -- 02:50 PM EST     -1.33 knots Max Ebb
Tue -- 04:27 PM EST     Moonset
Tue -- 04:37 PM EST     Sunset
Tue -- 04:58 PM EST     0.00 knots Slack
Tue -- 08:19 PM EST     1.14 knots Max Flood
Tue -- 09:18 PM EST     New Moon
Tue -- 10:57 PM EST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.6-0.9-1.2-1.1-0.50.40.811.10.80.3-0.2-0.7-1-1.2-1.3-0.900.711.110.5-0

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 (4,6,7,8)
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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.