Monday, August19, 2019 L-36.com


Marine Weather and Tides
West Dennis, MA

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7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
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 5:52AMSunset 7:37PM Monday August 19, 2019 4:50 PM EDT (20:50 UTC) Moonrise 9:52PMMoonset 9:34AM Illumination 82% Phase: Waning Gibbous; Moon at 19 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
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ANZ232 Nantucket Sound- 116 Pm Edt Mon Aug 19 2019
This afternoon..S winds around 10 kt. Seas around 2 ft.
Tonight..W winds 5 to 10 kt. Seas around 2 ft.
Tue..NW winds around 5 kt, becoming E in the afternoon. Seas around 2 ft.
Tue night..S winds around 5 kt. Seas around 2 ft. A chance of showers.
Wed..S winds 5 to 10 kt. Seas around 2 ft. A chance of showers and tstms.
Wed night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers and tstms.
Thu..W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers and tstms.
Fri..W winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Fri night..W winds 5 to 10 kt. Seas 2 to 3 ft. Winds and seas 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 116 Pm Edt Mon Aug 19 2019
Synopsis for massachusetts and rhode island coastal waters.. Southwest winds will blow across the waters this afternoon and evening ahead of an approaching cold front. This front will pass across the waters after midnight tonight. High pres builds over the waters Tue, then moves offshore Tue night. Another cold front will cross the waters sometime late Thu and be followed by high pres from the great lakes Fri into next 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 West Dennis, MA
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location: 41.67, -70.18     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 191815
afdbox
area forecast discussion
national weather service boston norton ma
215 pm edt Mon aug 19 2019

Synopsis
Very warm and humid conditions Monday will be accompanied by
scattered thunderstorms as a weak cold front sweeps across the
area. Behind the front, a brief period of drier and less humid
weather Tuesday. The front returns Wednesday as a warm front
with humid and very warm conditions overspreading the region wed
afternoon through Thursday. The return of this summer-like
airmass will be accompanied by the risk for scattered
thunderstorms Wed and thu. A cold front sweeps across the area
late Thu setting the stage for dry and less humid weather Friday
into the weekend.

Near term until 8 pm this evening
*** few strong thunderstorms possible this afternoon & early
evening ***
weak short wave and attending surface trough approaching from
the west this afternoon and is already beginning to trigger
scattered storms as of 2 pm over western ma. This trend will
spread eastward the remainder of the afternoon and likely impact
the late day commute in the boston to providence corridor.

Sb capes up to 2500 j kg on SPC mesoanalysis, thus high cape
environment will support robust updrafts. In addition mid level
speed MAX of 30-35 kt in the 700-500 layer will provide
sufficient shear to organize storms and yield threat for
damaging winds. Also with pwats climbing to near 2 inches very
heavy rainfall is likely in the stronger storms.

Otherwise hot and humid today with highs 90-95 away from the
south coast. Dew pts in the low to mid 70s providing heat
indices in the mid to upper 90s. Thus heat advisory will
continue for areas that experienced 95+ heat indices yesterday
and today.

Also stratus and fog along the south coast from earlier has just
about burned off.

Main concern today will be the risk for excessive heat. After
looking at observed conditions from Sunday, though it necessary
to expand a heat advisory into portions of eastern ma using the
lower 2-day threshold of 95 degrees.

Short term 8 pm this evening through 6 pm Tuesday
Showers and thunderstorms diminish rather quickly after sunset,
leaving most of the night dry. Increasing risk for more showers
and thunderstorms late Tuesday afternoon as a warm front passes
by.

Temperatures remain above normal, but dew points should not be
quite as high as today. This should prevent the need for a heat
advisory continuing into Tuesday.

Long term Tuesday night through Sunday
Highlights...

* shower and thunderstorm chances Wednesday-Thursday
* a cold front brings dry & cooler conditions Friday through the
weekend
details...

Tuesday night through Thursday... .

A series of shortwaves and a strong cold front will bring periodic
shower and thunderstorm chances through Thursday. Starting late
Tuesday early Wednesday a warm front will begin to make its way
north across the region. With this warm front comes a very humid
airmass (dewpoints rising from the 50s Tuesday to the low 70s early
Wednesday, and pwats back up near 2"). As mid level energy
associated with a weak shortwave moves through and interacts with
the warm front it initiates showers and thunderstorms. There is
potential for some strong thunderstorms given the moist warm sector
and CAPE values 2000-3000 j kg with moderate to good bulk shear (35-
45kts). Any storms that form could produce gusty winds and heavy
downpours given how much moisture is in the column. At the moment
the best chance for heavier rainfall looks to be areas north and
west, with less QPF over southeast ma coastal ri. However, we're
still too far out to nail down specifics with much confidence.

The surface low and upper trough over the great lakes region then
slides north and east late Wednesday to Thursday dragging its cold
front across southern new england overnight Thursday. Along and
ahead of the front we again see shower and thunderstorm chances with
>2000 j kg CAPE and good shear parameters (>40 kts bulk shear).

Temperatures remain relatively steady through this period in the
80s before a cool down arrives to end the week.

Friday through Sunday...

the cold front exits off the south coast or in the vicinity by
Friday morning leaving a cooler and much drier post frontal airmass
in its wake. Pwats drop to 0.5" while surface dewpoints in the low
50s will make the air feel refreshing compared to the previous week.

Surface high pressure and mid level ridging builds in through the
period bringing dry and pleasant weather through the weekend. Cold
pool aloft (850mb temps 7-10c) will allow for surface highs in the
70s each day.

Aviation 18z 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 ... Moderate confidence.

18z update ...

thunderstorms will impact much of the area until 8 pm with a few
strong storms with damaging winds and torrential brief
downpours. Otherwise low clouds and fog along the south coast
from earlier today has burned off but may come back later
tonight.

================================================================
tonight... Leftover shra tsra this evening with brief MVFR-ifr
conditions, thenVFR cigs. Patchy fog with MVFR-ifr vsbys mainly
after midnight.

Tuesday... MainlyVFR. Risk for scattered MVFR in shra tsra
Tuesday afternoon.

Kbos terminal... Moderate confidence in taf.

Kbdl terminal... Moderate confidence in taf.

Outlook Tuesday night through Friday ... Moderate confidence.

Tuesday night:VFR. Chance shra and tsra.

Wednesday: mainlyVFR, with local MVFR possible. Chance shra and
tsra.

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

Chance shra and tsra.

Thursday:VFR. Chance shra and tsra.

Thursday night:VFR. Slight chance shra.

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 ... High confidence.

Relatively tranquil boating conditions expected through Tuesday.

Winds generally less than 20 kt with seas of 4 feet or less. The
main concern will be the risk for fog across the eastern coastal
waters and around nantucket this morning with visibility less
than 1 nmi. Smaller risk of poor visibility in patchy fog
tonight around nantucket.

Outlook Tuesday night through Friday ... Moderate confidence.

Tuesday night: winds less than 25 kt. Seas locally approaching
5 ft. Chance of rain showers and thunderstorms.

Wednesday: winds less than 25 kt. Areas of seas approaching
5 ft. Chance of rain showers and thunderstorms.

Wednesday night: winds less than 25 kt. Seas up to 5 ft. Chance
of rain showers and thunderstorms.

Thursday: winds less than 25 kt. Local rough seas. Chance of
rain showers, chance of thunderstorms.

Thursday night: winds less than 25 kt. Areas of seas
approaching 5 ft. Chance of rain showers and thunderstorms.

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

Slight chance of rain showers.

Box watches warnings advisories
Ct... Heat advisory until 8 pm edt this evening for ctz002-003.

Ma... Heat advisory until 8 pm edt this evening for maz005-011-013-
014-017-018.

Ri... None.

Marine... None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 13 mi30 min SSW 12 G 14 75°F 76°F74°F
44090 14 mi50 min 72°F1 ft
WAXM3 - Waquoit Bay Reserve, MA 19 mi65 min SSW 2.9 83°F 1014 hPa74°F
NTKM3 - 8449130 - Nantucket Island, MA 27 mi56 min SSW 5.1 G 12 80°F 76°F1014.5 hPa
BZBM3 - 8447930 - Woods Hole, MA 28 mi56 min 77°F 73°F1014.2 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 37 mi60 min S 12 G 14 76°F 2 ft1012.6 hPa (-1.9)70°F

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA5 mi54 minSSW 12 G 2210.00 miA Few Clouds83°F73°F74%1013.5 hPa
Chatham, Chatham Municipal Airport, MA10 mi58 minSSW 8 G 1710.00 miPartly Cloudy82°F75°F82%1014.5 hPa
Otis Air National Guard Base, MA18 mi1.9 hrsWSW 1110.00 miFair86°F71°F62%1014.6 hPa
Provincetown Municipal Airport, MA24 mi54 minSSW 12 G 1710.00 miFair83°F73°F74%1013.1 hPa

Link to 5 minute data for KHYA

Wind History from HYA (wind in knots)
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Last 24hr6S6S6S6S5S6SW8SW8S5S7S9SW9SW8SW9SW6S7S9SW9SW9SW11S11SW12
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1 day agoSE4SE6SE3E3CalmCalmE3SE5CalmSE3SW3CalmCalmCalmCalmCalmW3W33Calm6S5S9
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2 days agoSE5S5SE6SE4CalmSE6SE4E3SE4SE5SE3E3E6CalmE3E434E7SE65SE6SE6E7

Tide / Current Tables for South Yarmouth, Bass River, Nantucket Sound, Massachusetts
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South Yarmouth
Click for Map
Mon -- 04:04 AM EDT     2.98 feet High Tide
Mon -- 05:53 AM EDT     Sunrise
Mon -- 09:34 AM EDT     Moonset
Mon -- 10:15 AM EDT     0.05 feet Low Tide
Mon -- 04:29 PM EDT     2.84 feet High Tide
Mon -- 07:35 PM EDT     Sunset
Mon -- 09:51 PM EDT     Moonrise
Mon -- 10:33 PM EDT     0.18 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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11.62.22.832.82.41.710.40.10.20.61.21.82.42.82.82.51.91.30.70.30.2

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
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Mon -- 12:32 AM EDT     -0.00 knots Slack
Mon -- 03:12 AM EDT     -1.82 knots Max Ebb
Mon -- 05:52 AM EDT     Sunrise
Mon -- 06:20 AM EDT     0.00 knots Slack
Mon -- 09:33 AM EDT     Moonset
Mon -- 09:43 AM EDT     2.08 knots Max Flood
Mon -- 01:00 PM EDT     -0.00 knots Slack
Mon -- 03:37 PM EDT     -1.78 knots Max Ebb
Mon -- 06:46 PM EDT     0.00 knots Slack
Mon -- 07:34 PM EDT     Sunset
Mon -- 09:50 PM EDT     Moonrise
Mon -- 09:59 PM EDT     1.89 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.6-0.5-1.4-1.8-1.7-1.2-0.30.71.522.11.81.10-1.1-1.7-1.8-1.4-0.70.21.11.71.91.7

Weather Map and Satellite Images
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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.
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Wind Forecast for Boston, MA (16,3,4,5)
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Ground Weather Radar Station Boston, MA
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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.