Saturday, March23, 2019 L-36.com


Marine Weather and Tides
Dennis Port, MA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:37AMSunset 6:57PM Saturday March 23, 2019 10:38 AM EDT (14:38 UTC) Moonrise 10:10PMMoonset 8:26AM Illumination 93% Phase: Waning Gibbous; Moon at 17 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- 716 Am Edt Sat Mar 23 2019
.gale warning in effect through this evening...
Today..W winds 20 to 25 kt with gusts up to 40 kt, diminishing to 15 to 20 kt with gusts up to 30 kt this afternoon. Seas 3 to 5 ft. A chance of snow this morning with vsby 1 to 3 nm.
Tonight..NW winds 15 to 20 kt, becoming W 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft.
Sun..W winds 10 to 15 kt, becoming sw 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 2 to 4 ft.
Sun night..SW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft.
Mon..W winds 5 to 10 kt, becoming N in the afternoon. Seas 2 to 3 ft. A chance of showers.
Mon night..N winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft.
Tue..N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Tue night..NE winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Wed..NE winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Wed night..E winds 5 to 10 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 716 Am Edt Sat Mar 23 2019
Synopsis for massachusetts and rhode island coastal waters.. Strong low pres tracks thru the canadian maritimes today. Snow showers before Sunrise move offshore after daybreak. West gales continue today and then slowly subside tonight. High pressure builds into the mid atlc region tonight and Sunday. A cold front then sweeps across the waters Mon followed by high pressure Tue and Wed. 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 231429
afdbox
area forecast discussion
national weather service boston norton ma
1029 am edt Sat mar 23 2019

Synopsis
Scattered snow showers will yield some minor accumulations mainly
across the high terrain before ending toward daybreak. Windy and
cold conditions prevail. After sunrise dry weather prevails but it
remains windy. Milder temperatures arrive Sunday, but it will
turn colder again Monday into the middle of next week.

Near term until 6 pm this evening
1015 am update...

satellite shows good clearing over the past few hours which will
help temperatures reach into the upper 40s even with moderate
caa. Wnw winds have come up across all of southern new england,
gusting 25-30kts with a few spots closer to 35kts. The edge of
the LLJ core will be moving further offshore this afternoon, so
expecting most locations to peak over the next several hours,
though we'll remain gusty through at least sunset (longer along
the coast).

Previous discussion...

wv imagery shows the shortwave just SE of the region as of 11z.

This suggest predominantly ava at this point aloft. Sfc winds
have also begun to increase out of the W with the impulse of
pres rises and enhanced mixing now after sunrise. These two
factors have led to much weak sn rates with sn completely ending
in spots across W ma ct. Feel that with bl mixing, there is
likely only another 1-2 hrs of sn left at any one location.

Peak LLJ is this morning, so its likely that gusts will settle
somewhat late morning and afternoon, but 30-35 kt. CAPE islands
still have best chance of exceeding these values later today,
so will maintain the current wind advisory as it stands.

Temps will recover nicely this afternoon to the upper 40s and
low 50s, low to mid 40s high terrain. However the gusty west
winds will make it feel considerably cooler with wind chills in
the 30s.

Short term 6 pm this evening through 6 pm Sunday
Tonight ...

trough finally exits offshore and is replaced by height rises
supporting dry weather. Chilly airmass remains in place with temps
falling into the 20s region-wide. Gusty west winds persist so
looking at wind chills in the teens.

Sunday ...

short wave ridging provides plenty of sunshine with perhaps some
late day mid high clouds from next approaching trough. However a
real fine day by late march standards with temps climbing into the
upper 50s and low 60s during the afternoon. West winds during the
morning provide mild conditions everywhere including the south coast
as well but temps will fall here into the 40s during the afternoon
as winds become wsw off the chill ocean waters.

Long term Sunday night through Friday
Highlights...

* cold front brings rain late Sunday night and Monday, with
snow across the higher inland terrain
* colder weather follows through mid week, then temperatures
look to rebound late next week
overview and model preferences...

love of the arctic vortex will be gradually settling toward n
quebec and labrador into the middle of next week, with longwave
trof developing across the ne. With a conduit to arctic air,
expecting a period of below normal conditions to linger into the
mid week time-frame. After which, a ridge currently locked to
the continental divide will begin to shift E and allow for both
warm advection and height rises, yielding a milder stretch
toward the weekend. Given there are reasonable agreement between
guidance throughout this period. Will use a consensus blend as
a baseline.

Details...

sun night into mon...

arctic cold front with reinforcing arctic air moves through
early mon. Noting a weak baroclinic leaf which could enhance
lift even in spite of the fact that the N tier is moisture
starved as a whole. Still enough moisture lift for a mix of
ra sn which will be dependent on both timing and whether the
bulk of the lift is ana-frontal or kata-frontal. Marginal bl sfc
temps suggest best risk for wintry precip is across the
interior. Otherwise, given lagging caa, temps will likely remain
near normal through mon.

Tue into wed...

period of below normal weather. H85 temps will dip to near
record low values (-12c to -15c) per SPC sounding climatology.

Although late march diurnal mixing should allow for bl depth to
exceed h85, this will still yield highs 5-10f below seasonal
normal values each day. With high pres near 1035mb settling
across the region, radiational cooling is likely during the
overnights allowing mins to fall into the teens to low 20s.

Thu and fri...

gradual moderation. With h85 temps returning to positive values
near +5c to +10c. Therefore, expecting highs to return to above
normal values. In fact, low 60s are possible away from the s
coast by Fri where downsloping can be maximized. Otherwise,
quiet wx continues thanks to remnants of high pres.

Next weekend...

low pres will be approaching linked to either pacific or arctic
wave or a hybrid thereof. It will likely be on the slow end
thanks to broad ridging in place across the E conus. Overall,
mainly warmer than normal conditions continue.

Aviation 14z Saturday through Wednesday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday ...

06z update ...

thru 12z ... High forecast confidence. Some uncertainty on exact
snow accumulations.

Mainly MVFR in snow showers before ending 09z to 12z from west
to east. Runways mainly wet except higher terrain terminals such
as korh where a coating up to 2 inches possible. West winds
gusting 30-40 kt with isolated g45 kt.

After 12z ... High forecast confidence.

Any leftover MVFR at 12z quickly lifts improves toVFR by 15z
and dry weather prevails but gusty west winds continue 30-40 kt.

Tonight ... High confidence.

Vfr, dry and diminishing west winds.

Sunday ... High confidence.

Vfr, dry and modest west winds becoming southwest.

Kbos terminal... MVFR in snow thru about 09z then improving to
vfr by 12z.

Kbdl terminal... MVFR in snow thru about 09z then improving to
vfr by 12z.

Outlook Sunday night through Wednesday ...

Sunday night: mainlyVFR, with local ifr possible. Breezy.

Slight chance shra.

Monday: mainlyVFR, with areas MVFR possible. Slight chance
shra.

Monday night through Wednesday:VFR. Breezy.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday ...

*** wnw gales continue today ***
today ... Wnw gales along with vsbys 1-3 nm in snow mainly before
sunrise, then moving offshore. 982 mb low along the maine coast is
the culprit for the gale force winds.

Tonight ... Gale center exits thru the maritimes resulting in sub-
gale force winds across the southern new england waters. Expect west
winds 20-30 kt. Dry weather and good vsby.

Sunday ... High pres off the mid atlc coast supports a modest west
wind becoming wsw in the afternoon. Dry weather and good vsby.

Outlook Sunday night through Wednesday ...

Sunday night into Monday: winds less than 25 kt. Seas locally
approaching 5 ft. Chance of rain showers. Local visibility 1 to
3 nm.

Monday night through Wednesday: winds less than 25 kt. Areas of
seas approaching 5 ft.

Box watches warnings advisories
Ct... None.

Ma... Wind advisory until 4 pm edt this afternoon for maz022-024.

Ri... None.

Marine... Gale warning until 8 pm edt this evening for anz231>235-237-
250-251-254>256.

Gale warning until 6 pm edt this evening for anz230-236.

Synopsis... Nocera doody
near term... Doody bw
short term...

long term... Doody
aviation... Nocera doody
marine... Nocera doody evt


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 14 mi29 min WNW 29 G 35 35°F 39°F999.5 hPa27°F
44090 17 mi39 min 38°F5 ft
WAXM3 - Waquoit Bay Reserve, MA 22 mi114 min W 8.9 33°F 998 hPa27°F
NTKM3 - 8449130 - Nantucket Island, MA 25 mi45 min 35°F 41°F999.8 hPa
BZBM3 - 8447930 - Woods Hole, MA 30 mi45 min 36°F 39°F1000.3 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 38 mi49 min W 29 G 37 37°F 8 ft995.9 hPa (+4.7)27°F

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chatham, Chatham Municipal Airport, MA8 mi47 minWNW 15 G 2510.00 miOvercast35°F25°F67%998.4 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA9 mi43 minW 15 G 2110.00 miOvercast36°F26°F67%998 hPa
Otis Air National Guard Base, MA21 mi44 minW 19 G 2910.00 miMostly Cloudy and Breezy34°F26°F75%999.3 hPa

Wind History from CQX (wind in knots)
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Tide / Current Tables for Dennis Port, Nantucket Sound, Massachusetts
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Dennis Port
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Sat -- 02:31 AM EDT     4.20 feet High Tide
Sat -- 06:39 AM EDT     Sunrise
Sat -- 08:18 AM EDT     -0.60 feet Low Tide
Sat -- 08:26 AM EDT     Moonset
Sat -- 02:57 PM EDT     4.07 feet High Tide
Sat -- 06:55 PM EDT     Sunset
Sat -- 08:39 PM EDT     -0.42 feet Low Tide
Sat -- 10:10 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.73.64.14.13.52.51.30.1-0.6-0.50.21.12.13.13.84.13.72.91.80.6-0.2-0.40.10.9

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Sat -- 02:26 AM EDT     -2.10 knots Max Ebb
Sat -- 05:33 AM EDT     0.00 knots Slack
Sat -- 06:38 AM EDT     Sunrise
Sat -- 08:26 AM EDT     Moonset
Sat -- 08:55 AM EDT     2.34 knots Max Flood
Sat -- 12:01 PM EDT     -0.00 knots Slack
Sat -- 02:48 PM EDT     -2.12 knots Max Ebb
Sat -- 05:57 PM EDT     0.00 knots Slack
Sat -- 06:55 PM EDT     Sunset
Sat -- 09:19 PM EDT     2.32 knots Max Flood
Sat -- 10:09 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-1.5-2.1-2-1.5-0.60.51.52.12.32.11.30-1.2-1.9-2.1-1.8-101.11.92.32.21.6

Weather Map and Satellite Images
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Wind Forecast for Boston, MA (10,2,3,4)
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Ground Weather Radar Station Boston, MA
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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.