Wednesday, December13, 2017 L-36.com


Marine Weather and Tides
East Dennis, 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 6:58AMSunset 4:12PM Wednesday December 13, 2017 5:58 AM EST (10:58 UTC) Moonrise 3:19AMMoonset 2:50PM Illumination 25% Phase: Waning Crescent; Moon at 25 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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ANZ231 Cape Cod Bay- 329 Am Est Wed Dec 13 2017
.gale warning in effect from 10 am est this morning through late tonight...
Today..W winds 20 to 25 kt with gusts up to 30 kt, increasing to 25 to 30 kt with gusts up to 40 kt this afternoon. Seas 4 to 7 ft.
Tonight..W winds 25 to 30 kt with gusts up to 40 kt, diminishing to 15 to 20 kt with gusts up to 30 kt after midnight. Seas 4 to 6 ft. A chance of snow.
Thu..W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of snow.
Thu night..W winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft.
Fri..W winds 5 to 10 kt. Seas around 2 ft.
Fri night..W winds 5 to 10 kt. Seas 1 foot or less.
Sat..NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft.
Sat night..NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft.
Sun..W winds 5 to 10 kt with gusts up to 20 kt. Seas around 2 ft.
Sun night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of rain and snow showers. 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 329 Am Est Wed Dec 13 2017
Synopsis for massachusetts and rhode island coastal waters.. A gale center will move into the maritimes today. Low pres will track south of new eng late tonight and early Thu. High pres builds into the region Fri, then another low pres will track to the north late Fri night and Sat. High pressure builds over the waters on Sunday. 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 East Dennis, MA
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location: 41.75, -70.16     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 130911
afdbox
area forecast discussion
national weather service taunton ma
411 am est Wed dec 13 2017

Synopsis
A gale center will move into the maritimes today with windy and
very cold conditions in its wake. A fast moving low pressure
will track south of new england late tonight and early Thursday
bringing a period of light snow to the south coast and
especially the islands. Another low pressure may bring some
light snow around Friday night then cold and dry for Saturday.

Somewhat milder temperatures return on Sunday.

Near term until 6 pm this evening
Mid level low moves across new eng this morning before lifting
to the NE this afternoon. Cold pool aloft with 500 mb temps
around -32c combined with some low and mid level moisture
moving through will lead to a period of bkn CU and can't rule
out a few flurries, especially higher terrain. Clearing later
afternoon.

The main weather story for today will be wind and cold in the
wake of the departing low pres moving into the maritimes. 850
mb temps bottom out around -15 to -16c today so only expect
minor recovery from morning lows. Highs will range through the
20s to near 30 outer CAPE islands, with some upper teens in
the berkshires. Wind chills will be in the single numbers and
teens. Well mixed boundary layer with steep low level lapse
rates will promote excellent mixing with soundings suggesting
peak gusts 40-50 mph, strongest mid late afternoon especially
over higher elevations. We expanded the wind advisory to include
all of ma ri.

Short term 6 pm this evening through 6 pm Thursday
A period of clear skies expected this evening with gusty winds
gradually diminishing overnight. However, clouds will quickly
return as a rather robust mid level shortwave moves across the
ohio valley to south of new eng late tonight and early thu. Low
pres tracks south of the coast and attempts to spread some
light snow north into portions of sne late tonight into early
thu. Plenty of dry air initially to overcome which will limit
northward extent of snowfall. Best chance for a period of light
snow will be near the south coast and especially the islands
where better moisture and lift. Guidance indicating a brief
period of modest omega in the dgz over the islands 09z-12z with
sharp decrease in omega to the north. Minor accum of a coating
to an inch is possible for the south coast and especially the
islands with low prob for 2 inches bid-ack. However, a sharp
gradient is expected on the northern edge of the snow shield so
if it shifts slightly south, little or no accum will be the
result.

Light snow may linger into Thu morning immediate south coast
and especially CAPE islands as low pres passes to the south.

Otherwise, drier air and clearing skies behind the departing
low pres will gradually move in from NW to SE but it may take
until mid afternoon for clearing to reach far SE new eng.

A period of gusty NW winds will develop Thu afternoon with
gusts 20-30 mph. Another unseasonably cold day with highs mid
20s to lower 30s.

Long term Thursday night through Tuesday
Overview...

mid level pattern remains active but progressive across the
lower 48 through this period. High amplitude pattern continues
late this week, with cutoff h5 low pressure across eastern
canada. Another mid level short wave will push out of the great
lakes late this week into the weekend. Models continue to signal
some southern stream energy and moisture trying to work up the
eastern seaboard Fri night into sat, and may see some moisture
try to link up with the short wave. Model solution spread lends
to lower confidence with this aspect of the forecast.

The amplified mid level pattern forecasted to break down late
this week into the weekend, with the western ridge flattening
out and the h5 cutoff out of ontario breaking down as it shifts
e. The steering flow then opens up, keeping systems moving
cross country while the western ridge may try to re-orient over
the eastern pacific by the end of the period.

As for temperatures, expect the coldest air across the region
thu night into sat, with h85 temps running from -10c to -15c for
a good portion of this period. With the pattern change, the mid
level steering flow flattens out which will allow temps to
moderate with a more westerly flow by late in the weekend into
early next week. Temps will trend close to normal into the
beginning of the work week.

Used a blend of available guidance through Saturday, then trended
toward an ensemble blend through the remainder of the period.

Details...

Thursday night...

expect mainly clear and cold conditions Thu night as high pres
builds E out of the ohio valley. Leftover w-nw winds gusting to
20- 25 kt Thu evening will diminish as the pres gradient
relaxes, though some higher gusts will linger along the
immediate coast. Clouds will start to increase from the S during
the early morning hours.

With h85 temps in the -10c to -15c range, will see surface
temps bottom out in the single digits and teens except lingering
in the lower 20s across the outer CAPE and nantucket.

Friday through Saturday...

h5 short wave and surface reflection will slide E out of the
great lakes, so clouds will continue to increase. Another low
and southern stream energy tries to develop off the mid atlc
coast Fri afternoon and, as winds shift to light s-sw, some low
level moisture will reach into central and southern areas by
late in the day. Best shot for scattered snow showers looks to
occur along the S coast, CAPE cod and the islands Fri night into
sat.

The system out of the lakes will push e, with most of what's
left of its energy pushing across northern new england.

However, some leftover moisture could reach the E slopes of the
berkshires Fri night through about midday Sat before
dissipating. Have slight chance to low chance pops going there.

As the coastal low exits by midday sat, pressure gradient
tightens again as high pres pushes e. Will see w-nw winds
become gusty once again, upwards to 20-25 mph. So, even with
slight milder temps, wind chill values will range from the
single digits across the higher terrain to around 20 along the
immediate coast by Sat afternoon.

Highs on Friday will remain below freezing for most areas,
except may reach the lower-mid 30s along the S coast, CAPE cod
and the islands. It will be a bit milder on Saturday, with highs
from the mid 20s across the higher terrain to the lower-mid 30s
across the coastal plain.

Saturday night...

high pressure ridge will build across the eastern seaboard, so
expect mainly mostly clear skies. Some gusty winds will linger
sat evening then diminish, but it will be another cold night.

Expect low temps in the teens for most areas, except in the 20s
along the immediate coast and islands.

Sunday and Sunday night...

as the high ridge shifts e, winds shift to s-sw which will
bring a bit milder air northward. However, will also see
moisture ahead of an approaching warm front moving ne. At this
point, looks like precip will start off as snow showers Sunday
afternoon, mixing with rain at times before changing to snow
showers Sun night. Not a whole lot of moisture expect with this
system. Some question how fast the warm front moves amongst the
model suite.

Monday and Tuesday...

at this point, the front should push offshore Monday, but again
rather wide model solution spread with the departing low. Not a
lot of cold air behind the front, though, as a nearly zonal
flow at the surface and aloft in place through tue. Current
forecasted temps suggest readings close to seasonal levels
during this timeframe.

Aviation 09z Wednesday through Sunday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday ...

through 12z...

areas of MVFR CIGS across the CAPE islands will quickly improve
toVFR. Wnw gusts to 25-30 kt.

Today... High confidence.

Vfr with sct-bkn050. Strong and gusty wnw winds peaking this
afternoon with gusts 35-40 kt, locally 45 kt over the higher
terrain.

Tonight... Moderate confidence.

MainlyVFR cigs, but lowering to MVFR over the islands and
south coast after 06z as area of light snow spreads north. Low
risk for brief ifr vsbys over the islands. Gusty winds to 35 kt
in the evening, diminishing overnight.

Thursday... High confidence.

Areas of MVFR in lingering light snow in the morning
cape islands and south coast, otherwiseVFR with gradual
clearing from NW to se. W NW gusts to 25 kt in the afternoon.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Thursday night through Sunday ...

Thursday night:VFR. Breezy.

Friday:VFR.

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

Slight chance shsn.

Saturday: mainlyVFR, with local MVFR possible. Breezy.

Saturday night:VFR. Windy with local gusts to 30 kt sat
evening.

Sunday:VFR. Breezy. Chance shsn.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday ... High confidence.

Gale force wnw winds peaking this afternoon into early this
evening with gusts 40-45 kt, then diminishing through tonight.

Another pulse of wnw gusts to 25-30 kt developing Thu afternoon.

Rough seas. Vsbys lowering in developing snow late tonight and
early Thu over south coastal waters, improving in the afternoon.

Outlook Thursday night through Sunday ...

Thursday night: moderate risk for small craft advisory winds
with areas of gusts up to 30 kt. Areas of rough seas.

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

Friday night: winds less than 25 kt. Seas locally approaching
5 ft. Chance of snow showers, chance of rain showers.

Saturday: moderate risk for small craft advisory winds with
gusts up to 30 kt. Local rough seas. Slight chance of rain
showers, slight chance of snow showers.

Saturday night: low risk for small craft advisory winds with
gusts up to 30 kt. Local rough seas.

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

Chance of rain showers.

Box watches warnings advisories
Ct... None.

Ma... Wind advisory from noon today to 10 pm est this evening for
maz007-019-022>024.

Wind advisory from noon today to 8 pm est this evening for
maz002>006-008>018-020-021-026.

Ri... Wind advisory from noon today to 10 pm est this evening for
riz008.

Wind advisory from noon today to 8 pm est this evening for
riz001>007.

Marine... Gale warning until 1 am est Thursday for anz232-235-237.

Gale warning from 8 am this morning to 1 am est Thursday for
anz233-234.

Gale warning from 10 am this morning to 1 am est Thursday for
anz230-231-251.

Gale warning from 10 am this morning to 9 pm est this evening
for anz236.

Gale warning from 10 am this morning to 3 am est Thursday for
anz250-254.

Gale warning until 3 am est Thursday for anz255-256.

Synopsis... Kjc evt
near term... Kjc
short term... Kjc
long term... Evt
aviation... Kjc evt
marine... Kjc evt


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 11 mi29 min 46°F3 ft
44020 - NANTUCKET SOUND 22 mi69 min WNW 23 G 27 33°F 44°F3 ft989.8 hPa (-0.0)28°F
WAXM3 - Waquoit Bay Reserve, MA 23 mi74 min 7 29°F 991 hPa20°F
BZBM3 - 8447930 - Woods Hole, MA 31 mi41 min 29°F 45°F991.9 hPa
NTKM3 - 8449130 - Nantucket Island, MA 32 mi41 min W 11 G 19 31°F 44°F991 hPa
44013 - BOSTON 16 NM East of Boston, MA 49 mi69 min W 23 G 29 30°F 48°F4 ft988.3 hPa (+0.5)

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA8 mi2 hrsW 410.00 miFair31°F26°F82%989.4 hPa
Chatham, Chatham Municipal Airport, MA10 mi67 minVar 6 G 1510.00 miPartly Cloudy31°F26°F82%989.9 hPa
Provincetown Municipal Airport, MA18 mi63 minW 17 G 2410.00 miOvercast31°F25°F79%989.9 hPa
Otis Air National Guard Base, MA20 mi64 minW 1610.00 miOvercast27°F17°F69%991.2 hPa

Wind History from HYA (wind in knots)
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Last 24hrSE3SE7SE10SE10
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S8SE7SW6S3CalmS7W4W10W9W7W8W12
G18
W4W10
1 day agoW5W6SW5W8
G16
W9W5--W1054CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE3NE3NE3
2 days agoW4NW5W8W7W9W8W9W10W10W10W4W6W4W3CalmCalmSW4CalmCalmCalmW4W4W6W3

Tide / Current Tables for Sesuit Harbor, East Dennis, Cape Cod Bay, Massachusetts
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Sesuit Harbor
Click for Map
Wed -- 01:01 AM EST     0.50 feet Low Tide
Wed -- 02:18 AM EST     Moonrise
Wed -- 06:59 AM EST     Sunrise
Wed -- 07:28 AM EST     10.04 feet High Tide
Wed -- 01:39 PM EST     0.47 feet Low Tide
Wed -- 01:49 PM EST     Moonset
Wed -- 04:10 PM EST     Sunset
Wed -- 07:58 PM EST     9.32 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.20.512.34.36.88.89.99.98.97.24.82.30.70.51.32.857.38.89.38.87.55.5

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Wed -- 02:17 AM EST     Moonrise
Wed -- 02:41 AM EST     2.04 knots Max Flood
Wed -- 05:35 AM EST     -0.00 knots Slack
Wed -- 06:58 AM EST     Sunrise
Wed -- 08:39 AM EST     -1.69 knots Max Ebb
Wed -- 11:40 AM EST     0.00 knots Slack
Wed -- 01:49 PM EST     Moonset
Wed -- 03:14 PM EST     2.04 knots Max Flood
Wed -- 04:10 PM EST     Sunset
Wed -- 06:07 PM EST     -0.00 knots Slack
Wed -- 09:08 PM EST     -1.59 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.81.51.921.60.6-0.4-1.2-1.6-1.7-1.3-0.60.31.11.721.91.20.1-0.8-1.4-1.6-1.4-0.9

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

GOES Local Image of Northeast    EDIT
Geos

Wind Forecast for Boston, MA (5,6,7,8)
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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.