Monday, December11, 2017 L-36.com


Marine Weather and Tides
Yarmouth Port, 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 4:12PM Monday December 11, 2017 5:30 PM EST (22:30 UTC) Moonrise 1:17AMMoonset 1:53PM Illumination 40% Phase: Third Quarter Moon; Moon at 23 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
ANZ231 Cape Cod Bay- 425 Pm Est Mon Dec 11 2017
.small craft advisory in effect from Tuesday morning through late Tuesday night...
Tonight..W winds 5 to 10 kt, becoming se after midnight. Seas 1 foot or less.
Tue..SE winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Rain.
Tue night..SW winds 10 to 15 kt, becoming W 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 2 to 4 ft. A chance of showers.
Wed..W winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Gusts up to 35 kt. Seas 3 to 5 ft.
Wed night..W winds 25 to 30 kt, diminishing to 20 to 25 kt after midnight. Gusts up to 40 kt. Seas 4 to 6 ft.
Thu..W winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Gusts up to 30 kt. Seas 2 to 4 ft.
Thu night..W winds 10 to 15 kt, becoming nw 5 to 10 kt after midnight. Gusts up to 20 kt. Seas around 2 ft.
Fri..NW winds around 5 kt. Seas 1 foot or less. A chance of snow.
Fri night..N winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of snow.
Sat..NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft.
Sat night..W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 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 425 Pm Est Mon Dec 11 2017
Synopsis for massachusetts and rhode island coastal waters.. High pressure will build across the waters tonight. Meanwhile, low pressure will approach from the great lakes and move across new england Tuesday. The low will head toward southern quebec Tuesday night and in its wake westerly gales could blow across the waters through Wednesday night. Low pressure moving off the delmarva peninsula will scoot south of the waters on Thursday. Another low will approach the waters Friday and Friday night, then head toward nova scotia on Saturday. 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 Yarmouth Port, MA
   Hourly   EDIT   Help
location: 41.71, -70.29     debug


Area Discussion for - Boston, MA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 kbox 112201
afdbox
area forecast discussion
national weather service taunton ma
501 pm est Mon dec 11 2017

Synopsis
Low pressure in the ohio valley will move across new england
Tuesday and northeast of the region Wednesday. It will bring
a mixed bag of weather with snow northwest, a mix to rain
central, and rain southeast late tonight and Tuesday. A shot of
arctic air follows Wednesday and Thursday with a period of
strong winds and bitterly cold wind chills. Another low pressure
system may bring more snow to the region sometime in the
Thursday night to Friday night timeframe, if it tracks close
enough to the coast. Somewhat milder weather will arrive by the
end of the upcoming weekend.

Near term until 6 am Tuesday morning
445 pm update...

a strong short wave trough seen on water vapor over il will be
rapidly moving east tonight and to eastern ny late tonight.

Low pressure at the surface over ohio will move into new york
state overnight. Warm air advection cloudiness will increase
across our region overnight and snow is likely to break out in
northwest ma before daybreak. There is a chance that
precipitation could reach as far as northern ct and central ma
by daybreak. Although 850 mb temperatures are cold enough for
snow, the 925 mb temperatures warm enough such that a few hours
of freezing rain are possible in northern ct, northwest ri, and
into southern worcester and middlesex counties in ma within a
few hours of daybreak. This could be a problem for the morning
commute.

We have expanded the winter weather advisory southward and
eastward a bit, to include hartford, tolland, windham (in ct),
northwest providence county (in ri), and central and northwest
middlesex counties (in ma). In these areas, a thin
coating... Less than one tenth of an inch... Of ice is possible
before daybreak. The advisory remains in effect for the
remainder of western and central ma.

Lows tonight will be in the 20s except low to mid 30s CAPE cod
and the islands. Light winds becoming southeast. Temperatures
may begin to rise late in southern areas as southeast winds
become established.

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

any freezing rain should be short-lived but it could be a factor
during the morning commute in the hartford, springfield, and
worcester areas, as well as the northwest suburbs of providence.

925 mb temps warm very rapidly on strong southerly low level
winds, so it should change to plain rain across most of southern
new england during the morning. In fact, high temperatures will
reach 50 degrees in ri and southeast ma!
in the higher terrain of northern worcester county and in the
slopes of the berkshires, snow will be moderate to heavy for a
few hours in the morning, with total accumulations ranging from
2 to 4 inches, with local amounts of 5 or 6 inches in the
extreme northwest corner of franklin county, ma. Even there,
some sleet and freezing rain may mix in during the afternoon.

Southeast winds will become gusty... With up to 25-35 mph gusts
possible along the coast. We have discounted the nam, which has
what appears to be way too strong of a LLJ of 80 kt at 850 mb
and 50-60 kt gusts at the surface. All other models are more
like 40-50 kt at 850 mb.

Tuesday night...

winds shift to the west behind the departing storm system.

However, as a vigorous upper level low approaches, scattered
snow showers or squalls are possible, which could add some
light accumulations, especially in western sections toward
Wednesday morning.

Long term Wednesday through Monday
Wednesday...

there is a chance of snow squalls continuing into Wednesday
morning as an arctic front progresses across southern new
england. Very little snow accumulation is expected with these
passing showers, likely up to an inch at most west of the
worcester hills.

Winds will pick up in the afternoon as there is an impressive upper
level jet overhead. Models are in agreement with 40kts at 925mb
mixing down to the surface Wednesday afternoon. The GFS suggests
the strongest winds will be over the northern tip of the cape
and extend into mass bay. Wind gusts between 40 to 50 mph are
not out of the question. Winds will likely peak by 00z Thursday
as the upper level jet sits directly over the region.

Wednesday night temperatures will range in the teens due to the
arctic airmass now over the region. With the combination of the
arctic airmass and strong surface winds, wind chills are likely
to hover near zero degrees overnight. With minimal cloud cover
as well, radiational cooling will add to the low apparent
temperatures.

Thursday and Friday...

strong winds will continue into Thursday morning but begin to
dissipate throughout the afternoon and evening.

Both the ECMWF and NAM point towards a weak system that brings
light snow to the islands and southern coast of new england
Thursday afternoon. The system will likely not linger off the
coast for very long, resulting in minimal snow accumulations, if
any at all.

The arctic airmass remains over the region through Thursday and
Friday resulting in much below normal afternoon temperatures. With
the winds diminishing by Thursday evening, wind chills should not be
an issue, however overnight temperatures will continue to range in
the teens across much of the region.

Friday night and Saturday...

a coastal low is expected to clip the region Friday Saturday
resulting in periods of heavy snow along the 95 corridor.

Unfortunately, the models are not in agreement with timing or
position for when it does make its way up to southern new
england.

Going with guidance from the ECMWF and nam, precipitation will push
north across the region starting at 18z. As the low moves further
northeast, east of the 95 corridor will likely see the most
accumulation. The coastal low is expected to push offshore by
Saturday afternoon.

Sunday...

a ridge builds in Sunday morning behind the coastal low. Winds will
turn to the southwest, advecting warmer temperatures into the region
by midday. Dry and seasonable temperatures will continue through
early next week.

Aviation 22z 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 ...

through this afternoon... High confidence.VFR.

Tonight... Moderate confidence.

Vfr to start, will give way to MVFR then ifr early am Tue as
cigs lower and light sn fzra moves in mainly after 08z from
w-e. Sn accums would be light. Light winds shift around to the e,
except SE along the coast.

Tuesday... Moderate confidence. Mixed MVFR and occasional ifr
conditions in a mix of sn fzra giving way to all ra through
sunrise into midday tue. Risk for NW ma to remain sn long
enough for accums to reach 3-6 inches with little or no snow
accumulation southeast of a hartford to boston line. Period of
fzra before the change to ra. Conditions improve after 20z.

Winds gusting to 20-30 kt along the coast.

Tuesday night... Moderate confidence. MVFR ceilings and scattered
snow showers moving from west to east across the region. Local
ifr in any heavier snow showers, especially in western sections.

West winds gusting to 20-25 kt at times.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Wednesday through Saturday ...

Wednesday: mainlyVFR, with local ifr possible. Windy with
gusts to 35 kt. Slight chance shsn.

Wednesday night:VFR. Strong winds with local gusts to 40 kt.

Thursday through Thursday night:VFR. Breezy.

Friday: mainlyVFR, with local ifr possible. Chance sn.

Friday night: mainlyVFR, with areas ifr possible. Breezy.

Chance sn.

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 Tuesday night ...

tonight... High confidence. Winds are slowly diminishing. Seas
will slowly subside... To below SCA criteria over the southern
waters by this evening. Quiet boating weather tonight, but that
will be very temporary.

Tuesday... Moderate confidence. Winds gradually shift around to
the se. Gusts 25-30 kt expected on the S waters with 35-40 kt
possible on the E waters. Gale warnings are in effect for the
eastern waters with small craft advisories posted for all other
waters. Rough seas of up to 5 to 10 ft on the outer waters.

Tuesday night... Winds shift to the southwest to west. Winds
still gusting to 25-30 kt and seas still quite rough, especially
over the southern outer waters.

Outlook Wednesday through Saturday ...

Wednesday: moderate risk for gale force winds with gusts up to
40 kt. Rough seas up to 14 ft. Slight chance of snow showers.

Visibility 1 to 3 nm.

Wednesday night: moderate risk for gale force winds with gusts
up to 40 kt. Rough seas up to 14 ft.

Thursday: moderate risk for small craft advisory winds with
local gusts up to 30 kt. Local rough seas. Local visibility
1 to 3 nm.

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

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

Chance of snow. Areas of visibility 1 to 3 nm.

Friday night: low risk for small craft advisory winds with
gusts up to 25 kt. Local rough seas. Chance of snow. Visibility
1 to 3 nm.

Saturday: moderate risk for small craft advisory winds with
gusts up to 30 kt. Rough seas up to 10 ft. Local visibility
1 to 3 nm.

Box watches warnings advisories
Ct... Winter weather advisory from 4 am to 10 am est Tuesday for
ctz002>004.

Ma... Winter weather advisory from 4 am to 1 pm est Tuesday for
maz005-010>012.

Winter weather advisory from 4 am to 4 pm est Tuesday for
maz002>004-008-009-026.

Ri... Winter weather advisory from 4 am to 10 am est Tuesday for
riz001.

Marine... Small craft advisory from 9 am Tuesday to 6 am est Wednesday
for anz231>234.

Small craft advisory from 1 pm to 7 pm est Tuesday for anz230-
236.

Small craft advisory until 6 am est Wednesday for anz235-237-
255-256.

Gale warning from 10 am to 7 pm est Tuesday for anz250-251-254.

Synopsis... Field correia
near term... Field
short term... Field
long term... Correia
aviation... Field correia
marine... Field correia


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
44090 9 mi30 min 47°F1 ft
WAXM3 - Waquoit Bay Reserve, MA 15 mi105 min 1 39°F 1015 hPa23°F
44020 - NANTUCKET SOUND 20 mi40 min W 7.8 G 9.7 39°F 45°F1 ft1016.1 hPa (+1.8)26°F
BZBM3 - 8447930 - Woods Hole, MA 24 mi42 min 39°F 46°F1016 hPa
NTKM3 - 8449130 - Nantucket Island, MA 31 mi42 min W 1.9 G 4.1 37°F 44°F1016.2 hPa
BUZM3 - Buzzards Bay, MA 45 mi30 min NW 4.1 G 6 39°F 1016.4 hPa (+1.4)
FRVM3 - 8447386 - Fall River, MA 46 mi42 min 1016.4 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 47 mi42 min NW 4.1 G 5.1 40°F 1015.3 hPa
FRXM3 47 mi42 min 39°F
44013 - BOSTON 16 NM East of Boston, MA 48 mi40 min WNW 9.7 G 12 38°F 48°F2 ft1014.6 hPa (+1.6)

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
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
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
Last
24hr
NW5
G9
NW6
G11
NW5
G9
NW4
G9
NW5
G8
W6
G9
NW3
W5
G8
W8
G16
W4
G13
W8
G11
W7
G13
NW5
G8
W4
W6
G14
NW6
G11
W4
G8
W7
G11
W4
G10
W7
G12
W5
G11
W6
G12
W5
G10
W3
G6
1 day
ago
N13
G20
N12
G22
N13
G25
N17
G24
N14
G21
N15
G25
N14
G21
N13
G22
N14
G19
N10
G17
NW8
G16
NW11
G16
NW8
G14
NW7
G10
W6
G10
W5
G9
W9
G16
W6
G12
W6
G12
NW13
G16
W9
G14
W8
G13
W5
G11
W5
G12
2 days
ago
SW2
G5
W3
W2
G7
S2
G5
SW3
S4
G8
S5
G8
S4
G7
S3
S3
S3
S2
SE1
NE3
NE4
NE6
NE6
G10
NE9
G13
NE11
NE9
G16
NE11
G17
N18
G23
N15
G24
N17
G27

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA2 mi34 minN 010.00 miFair32°F23°F69%1016 hPa
Otis Air National Guard Base, MA13 mi35 minN 010.00 miFair32°F23°F69%1016.3 hPa
Chatham, Chatham Municipal Airport, MA16 mi38 minN 010.00 miFair33°F25°F72%1016.5 hPa
Provincetown Municipal Airport, MA21 mi34 minW 710.00 miA Few Clouds37°F21°F54%1016.2 hPa

Wind History from HYA (wind in knots)
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
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
Last 24hrW4W3CalmCalmSW4CalmCalmCalmW4W4W6W3W5W6SW5W8
G16
W9W5W9W1054CalmCalm
1 day agoN14
G24
N12
G20
N14
G25
N15
G21
N14
G21
N11
G21
N11N11
G20
N14
G23
NW10
G17
NW7NW6W4NW5W8W7W9W8W9W10W10W10W4W6
2 days agoS3CalmCalmCalmN3CalmCalmCalmCalmCalmCalmE3CalmCalmN4N3NE5NE8N7N10N12N11
G21
N13
G21
N14

Tide / Current Tables for Barnstable Harbor, Beach Point, Massachusetts
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Barnstable Harbor
Click for Map
Mon -- 12:16 AM EST     Moonrise
Mon -- 05:43 AM EST     9.84 feet High Tide
Mon -- 06:58 AM EST     Sunrise
Mon -- 12:07 PM EST     0.80 feet Low Tide
Mon -- 12:52 PM EST     Moonset
Mon -- 04:10 PM EST     Sunset
Mon -- 06:05 PM EST     9.57 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.21.33.15.57.99.59.89.17.75.73.51.60.81.32.64.66.98.89.69.286.34.12

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
   EDIT      (on/off)   Help   One Week of Data
Cape Cod Canal
Click for Map
Mon -- 12:17 AM EST     Moonrise
Mon -- 12:21 AM EST     4.24 knots Max Flood
Mon -- 03:48 AM EST     -0.20 knots Slack
Mon -- 06:31 AM EST     -4.21 knots Max Ebb
Mon -- 06:59 AM EST     Sunrise
Mon -- 09:46 AM EST     0.18 knots Slack
Mon -- 12:50 PM EST     3.85 knots Max Flood
Mon -- 12:53 PM EST     Moonset
Mon -- 04:03 PM EST     -0.19 knots Slack
Mon -- 04:11 PM EST     Sunset
Mon -- 06:54 PM EST     -4.30 knots Max Ebb
Mon -- 10:11 PM EST     0.19 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.24.23.72.7-1.4-3.4-4.1-4.1-3.6-2.51.433.73.83.62.90.7-3-4-4.3-4-3.1-1.32.6

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 (17,4,5,8)
      (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.