Thursday, October19, 2017 L-36.com


Marine Weather and Tides
South Yarmouth, 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 6:57AMSunset 5:53PM Thursday October 19, 2017 5:21 AM EDT (09:21 UTC) Moonrise 6:33AMMoonset 6:14PM Illumination 1% Phase: Waning Crescent; 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
    EDIT      (on/off)   Help
ANZ232 Nantucket Sound- 352 Am Edt Thu Oct 19 2017
.small craft advisory in effect from 2 pm edt this afternoon through late tonight...
Today..SW winds 5 to 10 kt, increasing to 10 to 15 kt this afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Patchy fog this morning with vsby 1 to 3 nm.
Tonight..SW winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to 3 ft.
Fri..NW winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Fri night..N winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas around 2 ft.
Sat..NE winds around 5 kt, becoming S in the afternoon. Seas 1 foot or less.
Sat night..SW winds 5 to 10 kt. Seas 1 foot or less.
Sun..SW winds 5 to 10 kt. Seas around 2 ft.
Sun night..SW winds around 10 kt. Seas around 2 ft.
Mon..SW winds 5 to 10 kt. Seas around 2 ft.
Mon night..S winds 10 to 15 kt. Seas around 2 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 352 Am Edt Thu Oct 19 2017
Synopsis for massachusetts and rhode island coastal waters.. High pressure southeast of new england will provide dry weather and southwest winds today. A dry cold front will move across the waters tonight. Strong high pressure over the appalachians Friday will move east across the southern new england coastal waters this 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 South Yarmouth, MA
   Hourly   EDIT   Help
location: 41.64, -70.2     debug


Area Discussion for - Boston, MA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 kbox 190748
afdbox
area forecast discussion
national weather service taunton ma
348 am edt Thu oct 19 2017

Synopsis
High pressure will maintain dry weather and warmer than normal
temperatures through the weekend. Precipitation chances will
increase by the middle of next week.

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

as forecast well by the narre, areas of low cloudiness and fog
were forming across southern new england... Mainly south of the
mass pike. We have issued a special weather statement for the
fog in eastern ct, ri, and southeast ma valid through about 8
am. Some of the fog was locally dense, especially from plymouth
to new bedford and on upper CAPE cod from falmouth to hyannis.

The fog should lift a few hours after sunrise. Temperatures were
off to a chilly start, with upper 30s to mid 40s across much of
the region.

After areas of fog lift, skies will become sunny today. A weak
upper level short wave trough will move across new england late
this afternoon and early this evening, accompanied by some
high level cirrus clouds. At the surface, a weak, dry cold
front associated with this trough will be approaching the region
during the day. South-southwest winds ahead of this front will
become gusty this afternoon, reaching 35 kts at 925 mb, which
could translate to a few gusts to 25-30 mph possible at the
surface, especially in the late afternoon. Have continued on
the higher side of guidance for maximum temperatures this
afternoon... Mainly in the lower 70s but cannot rule out a few
mid-70s readings in the ct valley and in eastern ma. Cooler over
cape cod and the islands.

Short term 6 pm this evening through 6 pm Friday
Tonight... Weak front shifts to the east. Clear skies. Winds
shift to the W and weaken overnight. Lows mainly in the 40s
except some 50s CAPE and islands.

Friday... Strong high pressure centered over the appalachians
will provide bright sunshine. Northwest winds may gust to near
20 mph during the afternoon. High temperatures are only
expected to be slightly cooler... In the upper 60s to around 70.

Long term Friday night through Wednesday
* above average temperatures with dry conditions lasting into Monday
* precipitation chances are increasing for the middle of next week.

19 00z guidance remains in excellent agreement through this weekend.

High pressure in control with dry weather and above normal
temperatures continuing.

Some detail difference begin to arise with the handling of a closed
mid level low across the southern tier of the usa early next week.

These detail differences are almost entirely the result of timing
differences in breaking down the strong mid level ridge along the
eastern seaboard. The primary impact of this closed low will be to
provide energy ahead of a cold front toward the middle of next week.

Given the strength of the downstream ridge, will favor the less
progressive guidance, which would be closer to the 00z ecmwf.

That said, it is becoming increasingly likely our region will see
some light precipitation sometime late Monday night into Wednesday,
with the most likely timeframe currently being around Tuesday. This
could change over the next several days as the timing of a slow-
moving front becomes clearer.

Aviation 07z Thursday through Monday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Friday ... Generally high confidence.

330 am update...

areas of ifr conditions -- ceilings and visibilities -- in low
clouds and fog, mainly south of the mass pike early this
morning. The fog will be locally dense, especially along the
south coast from new bedford to plymouth and on upper CAPE cod
from falmouth to hyannis. Expecting any areas of fog to
dissipate by mid-morning, withVFR and clear skies taking hold.

Just a few cirrus clouds as a front approaches from the west
late in the afternoon.

Sw winds may gust to 23-27 kt this afternoon, especially toward
21z.

Vfr conditions tonight and Friday. Winds shifting to the w
tonight and diminishing, then NW Friday with gusts up to 20 kt.

Kbos terminal... High confidence in taf.

Kbdl terminal... Moderate confidence in TAF this morning, then
high confidence through Friday.VFR conditions. However, there
is a low risk for localized ifr ceilings developing around
daybreak, especially to the east of the airport.

Outlook Friday night through Monday ...

high confidence.VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Friday ... High confidence.

Today and tonight... S-sw winds increase this afternoon with
gusts to around 25 kt likely over all waters by late afternoon
and a slight increase in outer seas to near 5 ft. These winds
persist into the overnight but slowly diminish as they shift to
the W late tonight. Small craft advisories are in effect for
all waters.

Friday... Nw winds may gust to 20 kt and seas are forecast to
slowly subisde to 3 to 4 ft.

Outlook Friday night through Monday ... High confidence.

Great boating weather as high pressure prevails through this
upcoming weekend with sub small craft advisory conditions.

Fire weather
Ahead of a very weak cold front, s-sw winds will gust 20-25 mph
across much of the region this afternoon. There is a chance of
a few gusts to 25-30 mph by 4 or 5 pm. Relatively mild
conditions (highs in the low-mid 70s) and continued dry
dewpoints in the mid 40s to low 50s will yield min rh values
between 30 and 35 percent. With an overall recent lack of
precipitation, there could be an elevated fire weather risk for
today. A special weather statement has been issued highlighting
this risk.

On Friday, NW winds will be a little less, closer to 20 mph, but
the minimum rh will be closer to 30 percent. Thus there could
again be some risk of elevated fire potential.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory from 2 pm this afternoon to 4 am edt
Friday for anz231>234-250-251-254.

Small craft advisory from 2 pm this afternoon to midnight edt
tonight for anz230-236.

Small craft advisory from 4 pm this afternoon to 6 am edt
Friday for anz235-237-255-256.

Synopsis... Field belk
near term... Field
short term... Field
long term... Belk
aviation... Field belk
marine... Field belk
fire weather... Field


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
44020 - NANTUCKET SOUND 14 mi91 min WSW 9.7 G 12 61°F 61°F1 ft1024.6 hPa (-0.7)61°F
44090 15 mi51 min 60°F
WAXM3 - Waquoit Bay Reserve, MA 18 mi96 min Calm 57°F 1025 hPa56°F
NTKM3 - 8449130 - Nantucket Island, MA 25 mi51 min S 2.9 G 4.1 57°F 60°F1025 hPa
BZBM3 - 8447930 - Woods Hole, MA 26 mi51 min 61°F 63°F1024.4 hPa
BUZM3 - Buzzards Bay, MA 47 mi81 min SW 12 G 13 62°F 1024.7 hPa (-0.7)

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
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
5
AM
Last
24hr
W4
G9
W6
G10
W6
G10
W7
G14
W8
G16
W7
G12
W8
G12
W8
G13
W8
G13
W6
G13
W6
G9
W7
G12
SW4
G7
SW2
G5
SW3
G6
SW4
SW4
SW4
SW3
G6
SW3
SW3
SW4
SW3
SW3
1 day
ago
N12
G17
N14
G21
N12
G22
N13
G20
N12
G17
N10
G15
N8
G11
N8
G14
N7
G10
N5
G8
N4
G7
NW1
SW1
S2
SW2
SW2
W2
W4
W3
W3
W3
G6
W3
G6
W3
G6
W4
G8
2 days
ago
SW7
G14
SW5
G10
W5
G8
NW6
G10
NW9
G13
NW7
G15
NW5
G11
N8
G13
N11
G15
N9
G14
N8
G12
N9
G17
N11
G16
N12
G16
N11
G16
N12
G17
N16
G22
N16
G24
N14
G25
N16
G21
N15
G22
N10
G18
N9
G20
N7
G17

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA5 mi25 minN 07.00 miMostly Cloudy47°F46°F97%1024.4 hPa
Chatham, Chatham Municipal Airport, MA12 mi29 minSW 410.00 miFair58°F57°F100%1025.1 hPa
Otis Air National Guard Base, MA17 mi26 minN 010.00 miClear45°F44°F100%1025.1 hPa

Wind History from HYA (wind in knots)
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
5
AM
Last 24hrSW9SW7W8W8SW9W7SW6SW56NE6SW8SW6SW7SW4SW3SW4CalmCalmCalmCalmCalmCalmCalmCalm
1 day agoN12
G18
N15
G21
N11N11
G19
N14
G21
N10
G18
N9N10
G15
N7N7NE4SE3S3CalmSW5CalmSW3CalmSW8SW7W3CalmSW8SW9
2 days agoSW5NW3W4CalmW8W4NW7N10N11
G19
N10
G19
N13
G19
N10N10N10N9
G18
N13
G20
N14
G20
N12
G24
N10
G20
N12
G20
N12
G17
N11
G19
N11
G17
N10
G20

Tide / Current Tables for South Yarmouth, Bass River, Nantucket Sound, Massachusetts
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
South Yarmouth
Click for Map
Thu -- 01:04 AM EDT     3.15 feet High Tide
Thu -- 06:32 AM EDT     Moonrise
Thu -- 06:57 AM EDT     Sunrise
Thu -- 07:07 AM EDT     -0.12 feet Low Tide
Thu -- 01:24 PM EDT     3.23 feet High Tide
Thu -- 03:12 PM EDT     New Moon
Thu -- 05:52 PM EDT     Sunset
Thu -- 06:13 PM EDT     Moonset
Thu -- 07:32 PM EDT     -0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.93.132.51.80.90.2-0.100.51.22.12.83.23.22.82.11.30.4-0.1-0.20.20.81.6

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
   EDIT      (on/off)   Help   One Week of Data
Pollock Rip Channel
Click for Map
Thu -- 12:30 AM EDT     -1.86 knots Max Ebb
Thu -- 03:30 AM EDT     0.00 knots Slack
Thu -- 06:32 AM EDT     Moonrise
Thu -- 06:56 AM EDT     Sunrise
Thu -- 07:01 AM EDT     2.26 knots Max Flood
Thu -- 09:55 AM EDT     -0.00 knots Slack
Thu -- 12:52 PM EDT     -1.88 knots Max Ebb
Thu -- 03:12 PM EDT     New Moon
Thu -- 03:53 PM EDT     0.00 knots Slack
Thu -- 05:52 PM EDT     Sunset
Thu -- 06:13 PM EDT     Moonset
Thu -- 07:23 PM EDT     2.24 knots Max Flood
Thu -- 10:18 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.8-1.8-1.4-0.50.51.422.321.1-0.1-1.1-1.7-1.9-1.6-0.90.11.11.82.22.11.50.4-0.8

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 (5,6,7,8)
      (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.