Thursday, December13, 2018 L-36.com


Marine Weather and Tides
Ocean Bluff-Brant Rock, MA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:02AMSunset 4:13PM Thursday December 13, 2018 6:07 PM EST (23:07 UTC) Moonrise 12:24PMMoonset 11:07PM Illumination 38% Phase: Waxing Crescent; Moon at 6 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
ANZ251 Massachusetts Bay And Ipswich Bay- 336 Pm Est Thu Dec 13 2018
Tonight..S winds 5 to 10 kt. Seas around 2 ft.
Fri..S winds 5 to 10 kt. Seas 2 to 3 ft.
Fri night..SW winds 5 to 10 kt. Seas around 3 ft. A chance of rain after midnight.
Sat..W winds 5 to 10 kt, becoming nw in the afternoon. Seas 2 to 3 ft. A chance of rain in the morning.
Sat night..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft.
Sun..NE winds 10 to 15 kt with gusts up to 25 kt. Seas around 5 ft. A chance of rain.
Sun night..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 6 to 7 ft. A chance of rain in the evening, then a chance of showers after midnight with vsby 1 to 3 nm.
Mon..N winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas around 7 ft. A chance of showers. Vsby 1 to 3 nm in the morning.
Mon night..NW winds 10 to 15 kt with gusts up to 20 kt, increasing to 15 to 20 kt with gusts up to 30 kt after midnight. Seas 6 to 7 ft.
Tue..NW winds 20 to 25 kt with gusts up to 30 kt. Seas around 5 ft.
Tue night..NW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 5 ft. 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 336 Pm Est Thu Dec 13 2018
Synopsis for massachusetts and rhode island coastal waters.. High pres will shift E of the waters on Fri. A storm system will approach the waters from the sw Fri night and Sat, lifting slowly across the waters Sat night and Sun. High pres builds back towards the waters from the W on Tue into Wed. 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 Ocean Bluff-Brant Rock, MA
   Hourly   EDIT   Help
location: 42.15, -70.62     debug


Area Discussion for - Boston, MA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 kbox 132039
afdbox
area forecast discussion
national weather service boston norton ma
339 pm est Thu dec 13 2018

Synopsis
High pressure moves east of new eng through Friday with a milder
southerly flow developing. A series of low pressure systems
tracking south of new england may bring a period of rain Friday
night into early Saturday and again Sunday into Sunday night,
with mixed precipitation ice possible in the interior. A cold
front sweeps across the region Monday followed by blustery and
cold weather Tuesday into Wednesday, with moderating
temperatures by Thursday.

Near term until 6 am Friday morning
Robust mid level low and shortwave moves across sne late
afternoon and evening before moving offshore. Forcing for
ascent is weaker than might be expected with an impulse this
strong due to subsidence from departing high pres. This
combined with limited moisture is resulting in only some light
snow and flurries focused across western new eng where better
moisture. As this mid level system moves offshore tonight, good
mid level drying moves in but low level moisture persists,
especially across the west. This may lead to some very light
snow or even a bit of freezing drizzle in western ma ct as the
snow growth region dries out. Any precip will be spotty and it's
possible it just remains dry. In eastern new eng where low level
moisture is less, partial clearing is possible overnight. Lows
will be mostly in the 20s.

Short term 6 am Friday morning through Friday night
Friday...

high pres continues to move offshore with southerly flow
developing which brings milder air into sne. Still considerable
low level moisture below an inversion, especially west which
will result in mostly cloudy skies in western new eng where also
a low risk for spotty light rain or mixed precip. Sunshine in
eastern new eng will give way to increasing clouds in the
afternoon as moisture spreads east. Highs should range from
upper 30s to mid 40s, mildest across SE new eng.

Friday night...

split flow regime with northern stream trough across SE canada
and strong cut off over the SE conus. Confluent flow across new
eng will keep deeper moisture south of new eng. Some light rain
is expected Fri night, especially south of the pike but
steadier and heavier rainfall will remain to the south. Lows in
the 30s but steady or slowly rising temps expected overnight.

Long term Saturday through Thursday
* highlights...

- light to moderate rain possible Saturday
- skirting offshore storm system Sunday - Sunday night
- cold and dry Monday through Thursday
- another storm system possible late week
overview and model preferences...

unsettled sensible wx is mainly on the front end of the long
term. A N stream wave currently off the W pacific will rapidly
move E across the conus. It is the interaction with S stream
cutoff is the big question mark. Most of the guidance favors a
very late phasing of these two features, with the N stream wave
becoming dominant as the trof axis negatively tilts and orients
toward newfoundland-labrador. This late timing will still lead
to coastal cyclogenesis, but mainly to the s, with current
ensemble clustering favoring near or just SE of the 40 70
benchmark Sun night. Should the track remain this suppressed,
strong convection near the low center and within the developing
trowal will likely usurp much of the available moisture across
new england. The timing of the cyclogenesis is key, and given
the spread, there is still some uncertainty that will have to be
overcome once the pacific wave moves onshore and becomes better
sampled. Following the arctic push from the N stream wave early
next week, the remainder of the week is defined by zonal,
confluent flow as remnant ridging is slowly suppressed by a
strong W pacific jet and trof deepening. This should yield a
period of mainly quiet and moderating conditions. Given the
uncertainty early, will lean most heavily on ensemble means with
this forecast update.

Details...

sat and Sat night...

initial overrunning ahead of the S stream cutoff sets up along
a frontal boundary stalled from the DELMARVA to S of long
island. Strong suppression by +1025mb high to the N should keep
the bulk of the precipitation along the S tier. Echo previous
forecaster that at least some chance pops are warranted for this
risk. Antecedent airmass is generally warm enough for p-type to
be all rain by onset early daytime sat. Highs will reach the
mid-upper 40s with a spot 50. Overnight mins mainly in the 30s.

Sun and mon...

again will be monitoring complex upper lvl PV interactions and
coastal low pres development during the day on sun. At this
time, mid lvl moisture wrapping will lead to pwats reaching near
1.00in across S new england however the strongest dynamic
forcing will be co-located with the cyclogenesis, which is why
the track will ultimately determine how significant the outcome
will be. Noting in mass fields there is modest indication of
cold air damming from high pres to the ne, but again lower lvl
airmass looks to be mainly above freezing as any precipitation
develops. Highest risk for p-type issues will be NW ma.

Conditions dissipate Sun night into early Mon as cold front
associated with the arctic wave approaches, leading to mid and
lower lvl subsidence between offshore cyclone and the cold front
itself, so expect gradually improving conditions during the day
on mon. Temperatures, near seasonal until late mon, at which
point cold advection will begin.

Mon night into Tue night...

strong caa, expected along with rapid pres rises and tightening
pres gradient Tue morning. This will lead to blustery cold
conditions as the core of the arctic influenced wave pivots
across the region. In fact, with Tue highs struggling toe reach
the low-mid 30s, wind chill values (with gusts 20-30 mph likely)
will dip into the teens and low 20s. These values will also
likely be the ambient min temps Tue night as the floor drops out
with widening dewpoint depressions. Column does show enough
lingering moisture Mon night for a few shsn as the CAA develops.

Wed into thu...

high pres under confluence aloft with mainly quiet conditions
and gradual moderation of the airmass temps warming back to near
seasonal normals.

Aviation 21z Thursday through Tuesday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Friday night ...

through 00z...

areas of MVFR ifr in light snow across western ma and ct
valley, otherwiseVFR cigs.

Tonight... Moderate confidence.

MVFR CIGS across western ma and ct with a low risk for some very
light snow or fzdz. OtherwiseVFR with partial clearing SE new
eng.

Friday... Moderate confidence.

MVFR CIGS across much of the interior, especially western new
eng. MainlyVFR CIGS SE new eng.

Friday night... Moderate confidence.

Areas of MVFR ifr cigs. Chance of light rain.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Saturday through Tuesday ...

Saturday through Saturday night: mainlyVFR, with local ifr
possible very late. Breezy. Slight chance ra.

Sunday through Sunday night: mainly MVFR, with areas ifr
possible. Breezy. Chance shra, chance shsn.

Monday and Monday night: mainlyVFR. Windy with areas gusts to
30 kt.

Tuesday:VFR. Windy with gusts to 30 kt.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Friday night ... High confidence.

Tranquil boating conditions to prevail through Friday night as
high pres slowly drifts east of the waters. Winds below 20 kt
and seas below 5 ft. Chance of light rain Fri night.

Outlook Saturday through Tuesday ...

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

Chance of rain.

Saturday night through Sunday night: moderate risk for small
craft advisory winds with gusts up to 30 kt. Rough seas up to 10
ft. Chance of rain showers.

Monday: low risk for small craft advisory winds with gusts up
to 25 kt. Rough seas up to 9 ft. Chance of rain showers.

Monday night into Tuesday: strong winds with gusts up to 30 kt.

Rough seas up to 9 ft. Slight chance of snow showers. Local
visibility 1 to 3 nm.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Kjc doody
near term... Kjc
short term... Kjc
long term... Doody
aviation... Kjc doody
marine... Kjc doody


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
44013 - BOSTON 16 NM East of Boston, MA 14 mi78 min SSE 5.8 G 7.8 34°F 46°F3 ft1034.2 hPa (+0.9)22°F
44090 26 mi38 min 43°F1 ft
44029 - Buoy A0102 - Mass. Bay/Stellwagen 26 mi64 min S 7.8 G 12 33°F 43°F3 ft1034 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 26 mi78 min SE 3.9 G 7.8 33°F 3 ft1034.6 hPa (+0.7)19°F
BHBM3 - 8443970 - Boston, MA 27 mi44 min 33°F 1034.7 hPa
WAXM3 - Waquoit Bay Reserve, MA 40 mi83 min 1 33°F 1034 hPa23°F
FRVM3 - 8447386 - Fall River, MA 42 mi44 min 34°F 45°F1034.4 hPa
FRXM3 43 mi38 min 34°F 21°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 43 mi38 min ESE 5.1 G 7 34°F 1034.5 hPa
BZBM3 - 8447930 - Woods Hole, MA 43 mi38 min 35°F 40°F1034.1 hPa
PVDR1 48 mi38 min E 4.1 G 5.1 34°F 1034.4 hPa19°F
FOXR1 - 8454000 - Providence, RI 48 mi44 min SSE 4.1 G 7 34°F 42°F1033.9 hPa
44020 - NANTUCKET SOUND 49 mi28 min ESE 5.8 G 7.8 35°F 40°F1034.6 hPa23°F
CPTR1 - 8452944 - Conimicut Light, RI 49 mi38 min E 8 G 9.9 34°F 43°F1034.3 hPa

Wind History for Borden Flats Light at Fall River, MA
(wind in knots)    EDIT      (on/off)   Help
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
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
Last
24hr
N6
N9
N7
G10
N6
N6
N6
G9
N5
NE9
NE9
N4
N5
NE7
N6
NE5
NE7
NE7
NE7
SE5
SE7
E6
G9
E6
E6
E5
G8
E4
1 day
ago
SE1
N2
N4
N3
NE4
NE4
NE6
N9
N10
G14
NW8
NW7
NW6
NW8
NW6
NW7
G11
NW13
G16
NW16
G20
NW13
G17
N8
G12
NW12
G18
NW16
G23
NW9
G13
N5
NW8
2 days
ago
NE2
NE1
NE5
NE3
E4
NE2
N3
N2
N3
NW2
N2
N2
NE2
NE6
NE8
NE7
--
W5
W3
W7
SW5
S6
SE3
SE5

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Marshfield Airport, MA5 mi73 minN 010.00 miPartly Cloudy32°F23°F69%1034.5 hPa
Plymouth, Plymouth Municipal Airport, MA18 mi76 minN 010.00 miFair31°F21°F67%1034.7 hPa
Provincetown Municipal Airport, MA24 mi72 minN 010.00 miFair31°F21°F69%1034.9 hPa

Wind History from GHG (wind in knots)
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
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
Last 24hrNW7
G12
6
G15
5
G12
N7
G12
5NW4Calm3335CalmCalmNE6CalmSW46E3SE65SE5SE5CalmCalm
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmNW6
G12
5
G11
5
G10
NW7
G14
6
G11
NW56NW8
G17
NW8
G17
N7
G14
NW10
G15
NW9
G15
NW9
G20
NW966
G13
2 days agoNW46NW7
G15
NW5
G12
NW7NW3W3W4W3CalmCalmW3W3W33CalmCalmS4SW75W8
G14
W5
G11
CalmCalm

Tide / Current Tables for Damons Point, North River, Massachusetts
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Damons Point
Click for Map
Thu -- 03:26 AM EST     7.78 feet High Tide
Thu -- 07:02 AM EST     Sunrise
Thu -- 09:39 AM EST     1.53 feet Low Tide
Thu -- 11:24 AM EST     Moonrise
Thu -- 03:34 PM EST     8.28 feet High Tide
Thu -- 04:11 PM EST     Sunset
Thu -- 10:07 PM EST     Moonset
Thu -- 10:11 PM EST     0.78 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
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
3.456.77.77.66.95.64.22.81.81.62.545.578.18.27.46.14.52.91.50.81.2

Tide / Current Tables for Boston Harbor, Massachusetts Current
   EDIT      (on/off)   Help   One Week of Data
Boston Harbor
Click for Map
Thu -- 02:41 AM EST     -0.00 knots Slack
Thu -- 07:04 AM EST     Sunrise
Thu -- 07:21 AM EST     -0.89 knots Max Ebb
Thu -- 09:18 AM EST     0.00 knots Slack
Thu -- 11:16 AM EST     0.94 knots Max Flood
Thu -- 11:25 AM EST     Moonrise
Thu -- 02:55 PM EST     -0.00 knots Slack
Thu -- 04:11 PM EST     Sunset
Thu -- 07:41 PM EST     -0.95 knots Max Ebb
Thu -- 09:45 PM EST     0.00 knots Slack
Thu -- 10:08 PM EST     Moonset
Thu -- 11:48 PM EST     0.95 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
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
10.90.4-0.2-0.5-0.7-0.8-0.9-0.8-0.30.60.90.90.90.5-0-0.5-0.7-0.9-0.9-0.9-0.60.20.8

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
wmap_A
GOES Local Image of    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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (18,4,5,8)
      (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.