Tuesday, June18, 2019 L-36.com


Marine Weather and Tides
Yarmouth Port, MA

Version 3.4
NOTICE
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 5:04AMSunset 8:20PM Tuesday June 18, 2019 6:54 AM EDT (10:54 UTC) Moonrise 9:36PMMoonset 6:10AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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- 328 Am Edt Tue Jun 18 2019
Today..S winds around 5 kt, increasing to 5 to 10 kt this afternoon. Seas 1 foot or less. Isolated showers this morning, then scattered showers this afternoon.
Tonight..SE winds around 5 kt. Seas 1 foot or less. Patchy fog. Scattered showers. Vsby 1 to 3 nm.
Wed..E winds 5 to 10 kt. Seas 1 to 2 ft. Patchy fog. Vsby 1 to 3 nm.
Wed night..SE winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas 1 foot or less. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Thu..SE winds 5 to 10 kt. Seas 1 to 2 ft. Patchy fog. A chance of showers. Vsby 1 nm or less.
Thu night..SE winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Showers. Vsby 1 to 3 nm.
Fri..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Showers likely.
Fri night..NW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. A chance of showers.
Sat..NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Sat night..NW winds 5 to 10 kt. Seas 2 to 3 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 328 Am Edt Tue Jun 18 2019
Synopsis for massachusetts and rhode island coastal waters.. Stalled frontal boundary S of long island will be the focus for a series of weak low pressure waves and bouts of showers and Thunder- storms through Friday. Generally an easterly wind throughout with boating conditions below small craft advisory levels. High pressure into the weekend with westerly winds. 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 180757
afdbox
area forecast discussion
national weather service boston norton ma
357 am edt Tue jun 18 2019

Synopsis
Scattered showers today mainly S of the ma pike. A few spot showers
possible Wednesday into early Thursday, but overall dry weather
should dominate this time period. A low pressure system will
bring showers and a few embedded thunderstorms with locally
heavy rainfall, late Thursday into Friday morning. Dry weather
return for the weekend with a warming trend Sunday into Monday.

Near term until 6 pm this evening
* 4 am update ...

into morning ...

shower activity blossoming where weak isentropic lift aided by mid-
level ascent is prevailing. However perhaps the drier environment
per 0z soundings and or confluent flow aloft that is limiting
heavier shower activity. Pops prevailing mainly S of the ma-pike.

As alluded to earlier, from 0z soundings, fairly dry airmass N while
a continental-tropical ribbon s. Rising dewpoints, lowering surface
temperatures, spreads diminishing, seeing some patchy dense fog along
the s-coast. Meanwhile, mid-level energy collocated with the ribbon
of continental-tropical higher thetae air along a diffuse w-e stalled
frontal boundary. Offshore heavier shower and thunderstorm activity
apparent where elevated instability is present and low-level convergent
forcing is ongoing as per SPC mesoanalysis. Looking at h925-85 fields,
thetae fields creep N but not much further than the ma-pike. Holding
pops S accordingly with highest offshore as well as higher rainfall
amounts.

Today ...

widespread showers with embedded heavier downpours and thunderstorms
likely S of the ma-pike. An evaluation of lifting mechanisms as well
as thetae and instability axes. Focusing closely on surface-h7 wind
confluence, deformation and lapse rates collocated with a diffuse w-
e surface frontal boundary beneath stretched mid-level energy and
right rear quadrant of an h3 jet through the overall flat flow.

Several things stand out within a consensus of forecast guidance: 1)
that surface-h7 deformation is not further N of the ma-pike, 2) both
the thetae and instability axes are confluent mainly towards pa nj,
lower values across new england, especially at the surface, 3) that
better h925-85 confluence is S of long island, 4) surface to h85
lapse rates indicate the presence of a marine layer especially over
s SE coastal new england, 5) mid-level energy stretches across S new
england with heights remaining fairly stable, and 6) h3 diffluence
is apparent with the right-rear-quadrant of the upper-level jet.

Altogether, ingredients aren't lining up well over S new england for
a soaker, rather off the nj coast, along the s-coast of long island.

Evident in href, as oh river valley mid-level energy ejects E that
invokes a weak wave low along the stalled frontal boundary, will see
a pull S W of the maritime layer across SE new england. Believe the
focus for heavy rain and convection will be off nj, apparent in a
variety of href probabilistic guidance.

However, in collaboration with surrounding wfos and evaluating up-
stream trends, will press the higher pops and rainfall amounts s
of the ma-pike. There are subtle hints of weak height falls and
troughing that would support wave-low energy perhaps sneaking a
bit n. Yet, still think the heaviest will reside further S within
the more favorable convective environment of pa nj, perhaps into
the nyc tri-state region. Amounts over 0.50 from hartford to roughly
nantucket.

Short term 6 pm this evening through 6 am Wednesday
* 2 am update ...

toning down. Behind both the mid-level stretched impulse and weak
wave low along the diffuse w-e stalled frontal boundary, more than
likely having sulked s, optimistic that any shower and or thunder-
storm activity will be out over the waters. E onshore pull with
the low s, marine airmass, some fog low cloud concerns. Lows
down around 60.

Long term Wednesday through Monday
Highlights...

* a few spot showers possible Wed wed night but dry weather dominates
* showers and a few embedded t-storms with locally heavy rainfall
late Thu into Fri am particularly in northern and western ma
* dry weather anticipated for the weekend with a warming trend sun
into mon
details...

Wednesday into Wednesday night...

a weak boundary will be located across southern new england, but
there is little in the way of synoptic scale forcing. So while a
few spot showers will be possible from time to time, expect dry
weather to dominate Wed into Wed night despite lots of clouds. High
temperatures will mainly be in the 70s to perhaps near 80 in the ct
river valley. Meanwhile... Given onshore flow portions of the
eastern ma coast may struggle to reach 70.

Thursday into Friday...

a rather robust shortwave for the second half of june will approach
from the west. This combined with pwats of 1.75 to 2 inches and an
area of low level convergence should result in showers with locally
heavy rainfall, the bulk of which should be late Thu into fri
morning. A few embedded thunderstorms are possible as well with
some elevated instability. The axis of heaviest rain still needs to
be sorted out and will depend on the exact track of the surface low
pressure system frontal boundary. Current indications are that the
heaviest rainfall will setup across western and northern ma or in
northern new england. Areas north of this low level boundary will
serve as a focus for the low level jet high pwat axis.

So in a nutshell... The bulk of the showers and a few embedded t-
storms will be late Thu into Fri morning. However, axis of heaviest
rain remains uncertain and will come down to positioning of the
surface boundary and mesoscale meteorology. Currently favoring our
northern and western zones or perhaps in northern new england.

Saturday through Monday...

the persistent upper level trough across eastern canada will
gradually shift east this weekend through Monday. The result will be
rising height fields warming trend Sun into mon. Cyclonic flow
around departing low pressure should result in highs mainly in the
70s sat, and probably 80+ by Sun and especially mon.

Northwest flow aloft should result in dry weather this weekend. The
risk for some showers and a few t-storms may increase later Mon into
mon night as instability moisture increases ahead of the next cold
front.

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 tonight ... Moderate confidence.

Into morning ...

mostlyVFR. CIGS lowering 4-6 kft. However towards the s-coast,
lowering MVFR down to ifr lifr with fg. If any sct -shra, mainly
along and S of the ma pike. Light winds throughout.

Today ...

widespread MVFR-lifr nw-se with -shra mainly along and S of the
ma-pike with the threat of ra +ra tsra over the immediate s-coast
of new england and offshore. Light E SE winds throughout.

Tonight ...

widespread ifr-lifr CIGS with E onshore flow. Lower confidence
with respect to vsbys, however MVFR-ifr is expected. -shra
pushing S e, offshore, the TAF period looking dry.

Kbos terminal...

ifr possible immediately offshore during the morning hours.

Otherwise holding lowering conditions S E of the terminal
airspace through roughly 0z.

Kbdl terminal...

MVFR-ifr settling in during the morning hours and persisting
into tonight. Likely -shra by early morning through mid-
afternoon. Lower confidence ra +ra tsra, expect activity to
remain S of the terminal.

Outlook Wednesday through Saturday ... Moderate confidence.

Wednesday: MVFR ifr conditions possible. Slight chance shra.

Wednesday night: MVFR ifr conditions possible. Slight chance
shra, patchy fg.

Thursday: MVFR ifr conditions possible. Chance shra, isolated
tsra, patchy br.

Thursday night: mainly MVFR, with areas ifr possible. Shra,
isolated tsra.

Friday: mainly MVFR, with local ifr possible. Breezy. Chance
shra, isolated tsra.

Friday night 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 tonight ... High confidence.

Into early morning ...

light winds with visibility lowering as the night progresses in
areas of fog especially southern waters.

Today ...

weak low pressure tracks south of new england. Not much wind or
wave but poor visibility in showers and fog. Threat of heavier
rain, thunderstorms mainly over the s-waters.

Tonight ...

weak low exits across georges bank. Not much wind or wave with
its passage. However low visibility may linger despite rain
exiting seaward.

Outlook Wednesday through Saturday ... Moderate confidence.

Wednesday: winds less than 25 kt. Slight chance of rain
showers, patchy fog.

Wednesday night: winds less than 25 kt. Chance of rain showers,
patchy fog. Local visibility 1 to 3 nm.

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

Chance of rain showers, isolated thunderstorms, patchy fog.

Local visibility 1 to 3 nm.

Thursday night: winds less than 25 kt. Seas up to 5 ft. Rain
showers, isolated thunderstorms.

Friday: winds less than 25 kt. Seas up to 5 ft. Rain showers
likely, isolated thunderstorms.

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

Slight chance of rain showers.

Saturday: winds less than 25 kt. Seas up to 5 ft.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Frank sipprell
near term... Sipprell
short term... Sipprell
long term... Frank
aviation... Frank sipprell
marine... Frank sipprell


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 mi54 min 60°F
44020 - NANTUCKET SOUND 15 mi34 min S 3.9 G 5.8 62°F 64°F61°F
WAXM3 - Waquoit Bay Reserve, MA 15 mi69 min W 1.9 65°F 1016 hPa65°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 35 mi64 min S 7.8 G 7.8 60°F 2 ft1015.3 hPa (+0.4)60°F
44013 - BOSTON 16 NM East of Boston, MA 48 mi64 min NE 1.9 G 3.9 60°F 58°F1 ft1014.6 hPa (+0.6)60°F

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
-12
PM
-12
PM
-12
PM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
-12
PM
5
PM
6
PM
-12
PM
8
PM
9
PM
10
PM
-12
PM
12
AM
-12
PM
2
AM
-12
PM
-12
PM
5
AM
6
AM
Last
24hr
N5
N7
G10
NE2
G6
NE6
G9
NE8
NE5
G8
NE3
G6
NE2
SE3
S4
SW4
S3
S1
G5
S4
G8
SE2
1 day
ago
SW8
G14
SW9
G14
SW8
G15
S9
G14
SW6
G15
SW12
G21
SW9
G16
SW9
G17
SW10
G17
S8
G13
S9
G15
S7
G16
S8
G15
SW7
G12
W6
G13
SW6
G13
W6
G10
2 days
ago
W6
G12
W5
G9
SW5
G8
SW5
G10
SW6
G10
SW7
G14
SW8
G17
SW13
G19
SW10
G18
SW9
G16
SW10
G17
SW12
G16
SW11
G21
SW9
G19
SW8
G15

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA2 mi58 minSSW 66.00 miLight Rain Fog/Mist64°F62°F93%1015.5 hPa
Otis Air National Guard Base, MA13 mi59 minN 04.00 miLight Drizzle63°F62°F100%1015.6 hPa
Chatham, Chatham Municipal Airport, MA16 mi62 minSSW 73.00 miLight Rain Fog/Mist62°F61°F96%1016.2 hPa
Provincetown Municipal Airport, MA21 mi58 minS 710.00 miLight Rain62°F61°F96%1015.6 hPa

Wind History from HYA (wind in knots)
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 24hrN8N6N10N8N12N8N8N8N6CalmSE4S6SE4CalmS5S5S5S3SW43CalmS5S6S6
1 day agoSW8SW10SW11SW12S13
G22
SW13
G21
SW13SW17
G23
SW15S11
G22
SW13
G21
S11
G17
S11S10SW8SW9SW13SW9W4W4W3W4NW3NW3
2 days agoW8
G18
W8W8W9S8S10SW14S15
G21
S13
G25
S14
G23
SW16
G23
SW18
G27
SW21
G29
SW19
G26
SW15
G24
SW13
G22
SW16
G26
SW17
G27
SW21
G33
SW18
G30
SW15
G22
SW12SW8SW9

Tide / Current Tables for Barnstable Harbor, Beach Point, Massachusetts
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Barnstable Harbor
Click for Map
Tue -- 12:28 AM EDT     11.00 feet High Tide
Tue -- 05:06 AM EDT     Sunrise
Tue -- 06:09 AM EDT     Moonset
Tue -- 07:12 AM EDT     -0.54 feet Low Tide
Tue -- 01:08 PM EDT     9.55 feet High Tide
Tue -- 07:18 PM EDT     0.74 feet Low Tide
Tue -- 08:18 PM EDT     Sunset
Tue -- 09:35 PM EDT     Moonrise
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
10.810.89.87.95.52.80.5-0.5-0.11.53.86.58.79.59.286.241.90.81.12.757.5

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
   EDIT      (on/off)   Help   One Week of Data
Cape Cod Canal
Click for Map
Tue -- 01:32 AM EDT     -4.74 knots Max Ebb
Tue -- 04:47 AM EDT     0.21 knots Slack
Tue -- 05:07 AM EDT     Sunrise
Tue -- 06:11 AM EDT     Moonset
Tue -- 07:59 AM EDT     4.48 knots Max Flood
Tue -- 11:19 AM EDT     -0.03 knots Slack
Tue -- 02:00 PM EDT     -4.36 knots Max Ebb
Tue -- 05:07 PM EDT     0.19 knots Slack
Tue -- 08:07 PM EDT     4.13 knots Max Flood
Tue -- 08:19 PM EDT     Sunset
Tue -- 09:36 PM EDT     Moonrise
Tue -- 11:18 PM EDT     -0.12 knots Slack
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
-3.9-4.6-4.7-4.1-2.81.53.44.34.54.33.61.9-2.7-4-4.4-4.1-3.1-12.83.84.143.31.7

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
wmap_A
GOES Local Image of Northeast    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 (6,6,7,8)
      (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.