Monday, October23, 2017 L-36.com


Marine Weather and Tides
Winthrop Town, 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 7:06AMSunset 5:50PM Monday October 23, 2017 7:34 AM EDT (11:34 UTC) Moonrise 10:34AMMoonset 8:32PM Illumination 11% Phase: Waxing Crescent; Moon at 3 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- 716 Am Edt Mon Oct 23 2017
.small craft advisory in effect from Tuesday morning through Tuesday afternoon...
Today..S winds around 5 kt, becoming se this afternoon. Waves 1 foot or less. Patchy fog this morning with vsby 1 nm or less.
Tonight..SE winds 5 to 10 kt. Gusts up to 25 kt after midnight. Waves around 2 ft.
Tue..S winds 10 to 15 kt with gusts up to 30 kt. Waves around 2 ft. Patchy fog. Showers likely.
Tue night..S winds around 15 kt with gusts up to 30 kt. Waves around 2 ft, except 3 to 5 ft at the outer harbor entrance. Patchy fog. Showers with a chance of tstms. Some tstms may produce gusty winds, and heavy rainfall.
Wed..S winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft, except 3 to 5 ft at the outer harbor entrance. Patchy fog. Showers with a chance of tstms. Some tstms may produce gusty winds, and heavy rainfall. Vsby 1 nm or less.
Wed night..SW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves around 2 ft. Showers likely. Vsby 1 to 3 nm.
Thu..SW winds 5 to 10 kt. Waves 1 foot or less. A chance of showers.
Thu night..W winds around 5 kt. Waves 1 foot or less.
Fri..SW winds around 5 kt. Waves 1 foot or less.
Fri night..SW winds around 5 kt. Waves 1 foot or less. Winds and waves higher in and near tstms. 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 716 Am Edt Mon Oct 23 2017
Synopsis for massachusetts and rhode island coastal waters.. Strong high pres will move farther E of new england today. A strong cold front approaches from the W late Tue, then lingers around the region into Thu morning. Strong winds possible Tue into Wed, especially across the srn coastal waters. Brief high pres expected for Fri. 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 Winthrop Town, MA
   Hourly   EDIT   Help
location: 42.37, -70.98     debug


Area Discussion for - Boston, MA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 kbox 231056
afdbox
area forecast discussion
national weather service taunton ma
656 am edt Mon oct 23 2017

Synopsis
High pressure offshore will provide mild temperatures today but
also increasing humidity. A slow moving cold front will bring
rounds of heavy rain Tuesday into Wednesday with a period of
strong to damaging wind gusts possible. A few lingering showers
are possible Thursday, but the trend towards drier, less humid
and more seasonable temperatures are expected Thursday into
Friday. Above normal temperatures may return by this weekend.

Near term until 6 pm this evening
7 am update...

areas of dense continue at 7 am across much of northeast ct
including the greater hartford area, ri and southeast ma. This
is a result of the backdoor front that dropped southward into
the region Sunday and then became stationary last night. Also
low level moisture in the form of dew pt in the 50s (higher
than normal overnight lows) combined with drier air and
subsidence aloft trapping this moisture in place in the form of
areas of dense fog. This will slowly lift into a deck of
strato-cu this afternoon. Still warmer than normal today with
highs in the upper 60s to lower 70s despite much if any
sunshine. Just a warm airmass especially once boundary over the
area this morning lifts northward as a warm front. Mainly dry
much of the day but then a chance of scattered showers late
today as higher theta-e airmass advects northward into the
region. Overall not much change from previous forecast. Earlier
discussion below.

================================================================
areas of dense fog expected to slowly dissipate after daybreak.

Many locations reporting a visibility of one quarter mile or
less, so a dense fog advisory is in effect until 10 am. While
the visibility may improve, thinking lower clouds will linger a
while longer. This will mean lower MAX temperatures, but still
well above normal for mid late october.

Much of today should remain dry, but cannot completely dismiss
the possibility of a few showers reaching western ma and
portions of ct late today.

Short term 6 pm this evening through 6 pm Tuesday
Precipitable water increases tonight into Tuesday. Widespread
showers arrive along a cold front late tonight into Tuesday,
especially from worcester county west. Strong winds of 35-40 kt
jet just off the deck. Gusty winds will be more likely within
areas of heavier rainfall, especially Tuesday.

Low temperatures tonight should be close to our normal high
temperatures, with some increase in temperatures Tuesday from
the strong low level warm advection.

Long term Tuesday night through Sunday
Highlights...

* period of strong to damaging wind gusts possible Tue into wed
* heavy rain will result in an urban street flooding threat
tue-wed along with low risk of isolated flash flood threat
* less humid & more seasonable weather finally return Thu fri
tue night and wed...

synoptic overview...

slow moving cold front becomes parallel to upper flow as mid
level trough takes on negative tilt. This front will be
associated with an impressive warm conveyor belt up the eastern
seaboard containing subtropical moisture with pwats near the
2.00 inch mark, or nearly 3 std deviations above normal. Also
embedded within this warm conveyor belt is very strong wind
anomalies with 925 mb wind speeds of 55-65 kts, +4 std
deviations above climo! This low level jet builds a low level
thermal anomaly with nearly moist adiabatic lapse rates above
this warm anomaly. This very strong low level jet also advects
surface dew pts into the mid and upper 60s across southern new
england late Tue into early wed, generating mucapes of 300-500
j kg, very impressive for late oct.

Wind risk...

as mentioned above low level jet peaks at about 55-65 kt late
tue into early wed. Heavier showers (via precip drag) and
especially potential low top fine line (very strong frontal
convergence coupled with marginal instability) across western
ma ct will increase the risk for stronger winds aloft mixing to
the surface. Given leaves remain on most trees, this will
exacerbate the risk for downed limbs or even some trees with
localized power outages. Wind headlines will likely be needed as
we draw closer to the event.

Heavy rain...

subtropical moisture streams up the eastern seaboard with pwats
nearing 2 inches, +4 std deviations from climo for about 24-30
hrs! This duration coupled with strong frontal forcing and
marginal instability should be sufficient for periods of heavy
showers with isolated thunder possible. Much of the global
guidance offering a widespread 1-2" rainfall amounts with
localized 3-5" possible especially eastern ny into western ma ct
given greater risk of low top fine line.

Thu...

global guidance including ensembles suggest dry slot moves
across the area, thus a drying trend develops. However cold pool
aloft combined with cyclonic low may result in isolated diurnal
showers especially across the high terrain. Otherwise mainly
dry weather is expected. Turning less humid but only seasonably
cool.

Fri through the weekend...

looks like a period of short wave ridging between departing
trough and next trough upstream arriving here Sunday or early
next week. Ensembles suggest post frontal airmass Fri will be
close to seasonably normal and continuing into Sat along with
mainly dry weather. Ensembles also advertising long wave eastern
seaboard trough reloads with new jet energy around Sunday with
subtropical connection given high amplitude trough.

Aviation 12z Monday through Friday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday ... .

11z update...

ifr lifr will lift to MVFR toward midday. Mainly dry weather
much of today however scattered showers possible late in the day
especially across ct. Previous discussion below.

=================================================================
today... High confidence in ifr this morning. Moderate confidence
in timing improvement to MVFRVFR later today. Early morning
fog and low clouds with MVFR- ifr conditions should improve to
vfr by around 15z. However, MVFR CIGS may push into western ma n
central ct during the late afternoon. May see isolated showers
move into western areas after 18z. S winds increase to around
10 kt.

Tonight... Moderate confidence. Conditions lower to MVFR-ifr
across N central and western areas this evening in scattered
showers and patchy fog.VFR conditions to start across S central
and eastern areas, but CIGS lower to MVFR to local ifr after
midnight as showers slowly move e. Patchy fog will lower vsbys
to MVFR to local ifr as well. S winds gusting to 20-25 kt along
s coastal areas after midnight.

Tuesday... High confidence in trends. Moderate confidence in
timing. Mainly ifr with occasional MVFR in low CIGS rain fog. Some
occasional TS also possible with heavy ra at times. Winds gust
20-30 kt most of the region out of the s-se with a few gusts
30-40 kt mainly SE ma CAPE islands. Cannot rule out stronger
gusts everywhere in heavier rainfall thunderstorms. Areas of
llws likely, especially after 15z.

Kbos terminal... Moderate confidence in TAF due to timing issues
with cig improvement later this morning. Possible ifr could
linger longer than current forecast.

Kbdl terminal... Moderate confidence in taf. MainlyVFR. May see
brief MVFR-ifr vsbys in patchy fog through 14z or so but should
improve by morning push.

Outlook Tuesday night through Friday ...

Tuesday night: mainly MVFR, with local ifr possible. Windy with
gusts to 35 kt. Shra, chance tsra, patchy br.

Wednesday: mainlyVFR, with local ifr possible. Windy with
gusts to 30 kt. Shra, chance tsra, patchy br.

Wednesday night: mainlyVFR, with areas MVFR possible. Breezy.

Chance shra.

Thursday: mainlyVFR, with areas MVFR possible. Chance shra.

Thursday night through Friday:vfr.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday ...

relatively light winds and seas continue across the waters into
this evening. Increasing south winds ahead of a cold front will
also mean building seas tonight into Tuesday, especially across
the southern coastal waters. Moderate risk for gale force gusts
Tuesday across most of the waters.

Poor visibility in areas of fog across the southern coastal
waters this morning. Visibility will slowly improve after
daybreak.

Outlook Tuesday night through Friday ...

Tuesday night: low risk for gale force winds with gusts up to
35 kt. Rough seas up to 12 ft. Rain showers, chance of
thunderstorms, patchy fog. Local visibility 1 to 3 nm.

Wednesday: low risk for small craft advisory winds with gusts
up to 30 kt. Rough seas up to 13 ft. Rain showers, chance of
thunderstorms, patchy fog. Local visibility 1 nm or less.

Wednesday night: winds less than 25 kt. Rough seas up to 11 ft.

Rain showers.

Thursday: winds less than 25 kt. Areas of rough seas. Chance of
rain showers.

Thursday night: winds less than 25 kt. Local rough seas. Slight
chance of rain showers.

Friday: winds less than 25 kt. Areas of seas approaching 5 ft.

Box watches warnings advisories
Ct... Dense fog advisory until 10 am edt this morning for ctz002>004.

Ma... Dense fog advisory until 10 am edt this morning for maz011>013-
016>024.

Ri... Dense fog advisory until 10 am edt this morning for riz001>007.

Marine... Gale watch from Tuesday morning through Wednesday morning for
anz231>235-237-255-256.

Small craft advisory from 8 am to 6 pm edt Tuesday for anz230-
251.

Gale watch from Tuesday afternoon through Tuesday evening for
anz236.

Gale watch from Tuesday afternoon through Wednesday morning
for anz250-254.

Synopsis... Belk nocera
near term... Belk nocera
short term... Belk
long term... Nocera
aviation... Belk nocera
marine... Belk nocera


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 4 mi47 min 55°F 1027.7 hPa
44013 - BOSTON 16 NM East of Boston, MA 18 mi45 min ENE 1.9 G 1.9 54°F 58°F2 ft1028.2 hPa (+0.0)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 24 mi91 min S 1.9 G 3.9 55°F 59°F2 ft1028.1 hPa
FOXR1 - 8454000 - Providence, RI 45 mi53 min Calm G 1.9 54°F 63°F1028.1 hPa
IOSN3 - Isle of Shoals, NH 45 mi35 min S 4.1 G 5.1 54°F 1028.1 hPa (-0.5)51°F
PVDR1 46 mi47 min NNE 2.9 G 4.1 54°F 1028.4 hPa54°F
FRVM3 - 8447386 - Fall River, MA 47 mi53 min 55°F 63°F1028.8 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 47 mi47 min N 4.1 G 5.1 55°F 1027.5 hPa
BGXN3 - Great Bay Reserve, NH 48 mi110 min Calm 52°F 1029 hPa50°F
FRXM3 48 mi47 min 55°F 55°F
CPTR1 - 8452944 - Conimicut Light, RI 49 mi53 min N 4.1 G 5.1 54°F 63°F1028.1 hPa

Wind History for Providence, RI
(wind in knots)    EDIT      (on/off)   Help
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
5
AM
6
AM
Last
24hr
NW1
NW1
--
SE1
SE1
SE2
S4
S8
S8
S8
S7
G10
S4
G8
SE4
SE2
SE3
NE1
E1
E1
E2
NE1
G4
--
NE1
G4
E2
E1
1 day
ago
NE1
SW2
S3
S4
S7
S9
S13
G17
S11
G14
S11
G14
S10
S8
S7
SW4
SW4
S4
SW3
S2
E1
SW1
--
S2
--
NE3
NE1
2 days
ago
NW6
G9
NW7
G13
N10
G13
NW10
G15
NW8
G15
N7
G13
N9
G17
N10
G15
N12
G17
N8
G16
N11
G14
N7
G12
NW3
G6
NW7
G11
NW2
NW4
N5
G8
NW9
G12
N1
G4
N4
N4
N5
--
--

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA3 mi41 minN 08.00 miOvercast54°F53°F97%1028.6 hPa
East Milton, MA13 mi99 minN 0 mi52°F51°F97%1029.3 hPa
Beverly, Beverly Municipal Airport, MA15 mi42 minSE 56.00 miFog/Mist53°F51°F93%1028 hPa
Norwood, Norwood Memorial Airport, MA16 mi42 minN 00.50 miFog55°F54°F96%1028.4 hPa
Bedford, Hanscom Field, MA18 mi39 minSSE 36.00 miFog/Mist54°F50°F87%1029.4 hPa

Wind History from BOS (wind in knots)
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
5
AM
6
AM
7
AM
Last 24hrW4CalmNE5E4E6E8E10E10NE9E7E7E6NE6NE4NE3Calm--CalmCalmNE33CalmSE5Calm
1 day agoS4SW4SW4S4W6S7SW4W8W10--W9SE9S9S5SW8SW5S4SW4SW4CalmCalmCalmCalmCalm
2 days agoW9W10NW15
G21
W12W11
G20
W14
G19
NW8W11
G18
W12
G19
NW15
G23
W10W8W9NW11NW9NW10NW9NW6W4S4W5W7W3SW3

Tide / Current Tables for Belle Isle Inlet entrance, Boston Harbor, Massachusetts
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Belle Isle Inlet entrance
Click for Map
Mon -- 02:25 AM EDT     9.60 feet High Tide
Mon -- 07:06 AM EDT     Sunrise
Mon -- 08:21 AM EDT     0.92 feet Low Tide
Mon -- 10:33 AM EDT     Moonrise
Mon -- 02:33 PM EDT     10.19 feet High Tide
Mon -- 05:49 PM EDT     Sunset
Mon -- 08:33 PM EDT     Moonset
Mon -- 08:51 PM EDT     0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.38.39.59.48.26.44.32.311.22.74.66.78.71010.197.14.92.70.80.31.12.8

Tide / Current Tables for Boston Harbor, Massachusetts Current
   EDIT      (on/off)   Help   One Week of Data
Boston Harbor
Click for Map
Mon -- 01:42 AM EDT     -0.00 knots Slack
Mon -- 06:07 AM EDT     -1.07 knots Max Ebb
Mon -- 07:06 AM EDT     Sunrise
Mon -- 08:10 AM EDT     0.00 knots Slack
Mon -- 10:33 AM EDT     Moonrise
Mon -- 11:18 AM EDT     1.12 knots Max Flood
Mon -- 01:58 PM EDT     -0.00 knots Slack
Mon -- 05:49 PM EDT     Sunset
Mon -- 06:32 PM EDT     -1.16 knots Max Ebb
Mon -- 08:33 PM EDT     Moonset
Mon -- 08:42 PM EDT     0.00 knots Slack
Mon -- 11:52 PM EDT     1.03 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.4-0.2-0.6-0.9-1-1.1-0.9-0.20.71.11.11.10.6-0-0.5-0.9-1-1.1-1.1-0.60.30.91

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 (7,2,3,4)
      (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.