Friday, November24, 2017 L-36.com


Marine Weather and Tides
Dennis 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 6:40AMSunset 4:15PM Friday November 24, 2017 2:14 AM EST (07:14 UTC) Moonrise 12:18PMMoonset 10:33PM Illumination 30% Phase: Waxing Crescent; Moon at 5 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 Am Est Fri Nov 24 2017
Rest of tonight..NW winds 5 to 10 kt. Seas around 2 ft.
Fri..SW winds 5 to 10 kt. Seas around 2 ft.
Fri night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft.
Sat..SW winds 5 to 10 kt with gusts up to 20 kt. Seas around 2 ft.
Sat night..W winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft. A chance of showers.
Sun..NW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft.
Sun night..NW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft.
Mon..W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Mon night..NW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Tue..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Tue night..SW winds around 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 116 Am Est Fri Nov 24 2017
Synopsis for massachusetts and rhode island coastal waters.. High pres will build over the waters tonight and tomorrow. Unsettled weather returns on Sat as low pres moves E across srn quebec. Gusty nw winds follow on Sun ahead of high pres building towards the E coast. High pres to follow into early next week. 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 Dennis Port, MA
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location: 41.65, -70.12     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 240646
afdbox
area forecast discussion
national weather service taunton ma
146 am est Fri nov 24 2017

Synopsis
Quiet weather through Friday with dry and cool conditions.

Milder air returns Saturday ahead of a cold front. That cold
front swings through southern new england late Saturday and
early Saturday night. Blustery and cooler weather follows
Sunday. Conditions trend toward dry and milder again Tuesday
and Wednesday, and then cool again Thursday behind another cold
front.

Near term through today
Mid and high level clouds continue to dissipate as they move
east across southern new england this morning. The thicker mid
level clouds towards the berkshires will be more stubborn to
erode as there is some connection to the great lakes to keep the
humidity higher, along with the upslope over the berkshires
themselves.

Adjusted the forecast through daybreak to reflect observed
trends.

For today, high pressure to our south will dominate our
weather. Dry conditions with relatively light west winds
shifting southwest as the day progresses. Abundant sunshine with
only a few higher clouds from time to time. This sunshine will
permit higher temperatures than Thursday, and close to normal
values for late november.

Short term tonight through 6 pm Saturday
Southwest winds should increase slightly tonight, setting the
stage for a warmup Saturday. As noted by prior shift, dewpoints
also increase with the southwest flow, but not expecting fog to
be an issue. Low stratus is likely across the CAPE and islands
late tonight. Dry conditions continue.

Saturday should be above normal temperature-wise as modest
southwest winds continue ahead of a cold front. Latest model
suite continues to show pretty good lift and humidity within the
850-700 mb layer, but more drier air beneath it to be overcome.

Envisioning a scenario where clouds increase through the day,
with dry weather into mid-late afternoon.

Since this is a cold frontal passage, and bufr soundings
continue to show the column saturating from the top down, will
continue the idea of a slight chance for showers, becoming a
greater risk towards the east coast very late in the day
Saturday due to proximity to more humid low levels.

Long term Saturday night through Thursday
Big picture...

longwave scale shows a broad trough along the usa east coast and
west atlantic, a second trough over the eastern pacific, and a ridge
over the the plains. The eastern trough lingers much of the week
while the overall flow trends zonal.

Model consensus shows northern stream shortwaves crossing new
england Saturday night Sunday and again Wednesday. The models also
show a southern stream low crossing the southeast usa Thursday
trailing the Wednesday northern shortwave.

The mass and thermal fields are similar through Mon night Tuesday,
but then diverge by showing different timing of the northern and
southern stream features. The feature that becomes the northern and
southern shortwaves next week is currently over the aleutians and
diving south over the pacific ocean... And it reaches the usa west
coast by Monday. Expect changeable solutions regarding this feature
until that time.

Contour heights and thermal fields are a little above normal
Saturday, trend colder than normal Sunday-Monday, then trend above
normal midweek next.

Details...

Sunday-Monday...

upper trough digs over new england Sunday. Cold pool will be in
place with 500-mb temps at -28c working to destabilize the airmass.

Moisture lingers below 800 mb during this time. Expect quite a few
clouds to pop during the day, but moisture is too limited for
showers. Mixed layer temps will support MAX sfc temps in the upper
30s and 40s.

The trough moves off on Monday and high pressure builds surface and
aloft. Expect a fair day with MAX sfc temps in the 40s.

Tuesday through Thursday...

another cold front crosses us midweek, driven by the northern stream
shortwave. As noted above, there are timing uncertainties among the
models, so we used a blend. This favors a Wednesday passage at this
time, but the uncertainties noted above may change that exact
timing. This will need to be monitored. The blend of model data
supports slight chance pops Wednesday with the cold FROPA and mainly
dry Thursday.

Aviation 06z Friday through Tuesday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Saturday ... High confidence.

Vfr. W NW winds diminish overnight, turning S SW into today.

Bkn-ovc MVFR CIGS possible for SE new england into tonight into
early Saturday morning.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Saturday night through Tuesday ...

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

Slight chance shra.

Sunday:VFR. Windy with local gusts to 30 kt.

Sunday night through Tuesday:VFR. Breezy.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Saturday ...

small craft advisories adjusted to account for trends in
observed seas. Expecting all advisories for the outer coastal
waters to be down by daybreak this morning. Will adjust timing
as needed. High pressure in control with good boating weather
for a time today.

Increasing southwest winds tonight into Saturday will likely
build seas once more across portions of the outer coastal
waters. Additional small craft advisories may be needed for
marginal rough seas.

Outlook Saturday night through Tuesday ...

Saturday night: winds less than 25 kt. Seas locally approaching
5 ft. Slight chance of rain showers.

Sunday: moderate risk for small craft advisory winds with gusts
up to 25 kt. Areas of seas approaching 5 ft.

Sunday night: winds less than 25 kt. Local rough seas.

Monday: low risk for small craft advisory winds with gusts up
to 25 kt. Local rough seas.

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

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

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory for hazardous seas until 7 am est this
morning for anz254.

Small craft advisory for hazardous seas until 3 am est early
this morning for anz255.

Synopsis... Wtb belk
near term... Belk
short term... Belk
long term... Wtb
aviation... Wtb belk
marine... Wtb belk


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 15 mi85 min WNW 12 G 14 42°F 49°F1 ft1015.5 hPa (+0.0)28°F
44090 17 mi45 min 49°F2 ft
WAXM3 - Waquoit Bay Reserve, MA 22 mi90 min Calm 34°F 1016 hPa22°F
NTKM3 - 8449130 - Nantucket Island, MA 25 mi45 min WNW 5.1 G 8 40°F 47°F1015.9 hPa
BZBM3 - 8447930 - Woods Hole, MA 30 mi45 min 39°F 50°F1015.9 hPa

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
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Last
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NW9
G17
NW9
G14
NW7
G15
NW6
G10
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G14
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G15
N9
G14
NW6
G11
NW6
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G11
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SW5
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G6
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G18
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G11
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N4
G7
NE2
G6
NE1
NW6
NW15
G26
NW12
G23
NW15
G27
NW17
G25
NW16
G30
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G23
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G21
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NW11
G20
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SW4
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G12
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G12
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G19
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G19
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G22
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G24
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G14
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G17
SW12
G17
SW7
G13
SW9
G15
S7
G14
S6
G11

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chatham, Chatham Municipal Airport, MA8 mi23 minVar 510.00 miFair32°F21°F66%1016.2 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA9 mi79 minW 510.00 miFair29°F24°F82%1015.4 hPa
Otis Air National Guard Base, MA21 mi20 minWNW 410.00 miFair30°F21°F69%1016.3 hPa

Wind History from CQX (wind in knots)
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Last 24hrNW9
G16
NW9
G20
45546NW856NW75SW5SW3CalmCalmCalmCalmW3W3W3W335
1 day agoSW3SW3SW56S8
G18
S11
G19
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G23
S7W4NW74NE5NE6NE53N12
G21
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G25
NW12
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G27
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2 days agoW5SW4SW5SW7SW7SW5SW75
G15
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G23
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G20
SW11
G22
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G19
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G16
SW7SW7SW5SW43

Tide / Current Tables for Dennis Port, Nantucket Sound, Massachusetts
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Dennis Port
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Fri -- 03:53 AM EST     3.14 feet High Tide
Fri -- 06:40 AM EST     Sunrise
Fri -- 09:25 AM EST     0.64 feet Low Tide
Fri -- 11:17 AM EST     Moonrise
Fri -- 03:59 PM EST     3.38 feet High Tide
Fri -- 04:13 PM EST     Sunset
Fri -- 09:33 PM EST     Moonset
Fri -- 09:58 PM EST     0.32 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.422.633.12.92.31.71.10.70.71.11.72.22.83.23.43.22.61.91.20.60.30.5

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Fri -- 01:12 AM EST     -0.00 knots Slack
Fri -- 03:46 AM EST     -1.60 knots Max Ebb
Fri -- 06:39 AM EST     Sunrise
Fri -- 06:58 AM EST     0.00 knots Slack
Fri -- 10:11 AM EST     1.62 knots Max Flood
Fri -- 11:16 AM EST     Moonrise
Fri -- 01:23 PM EST     -0.00 knots Slack
Fri -- 04:00 PM EST     -1.62 knots Max Ebb
Fri -- 04:13 PM EST     Sunset
Fri -- 07:08 PM EST     0.00 knots Slack
Fri -- 09:33 PM EST     Moonset
Fri -- 10:35 PM EST     1.93 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.20.2-0.8-1.4-1.6-1.3-0.800.81.41.61.51.10.4-0.6-1.4-1.6-1.4-0.9-0.10.81.51.91.9

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Northeast    EDIT
Geos

Wind Forecast for Boston, MA (2,6,7,8)
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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.