Thursday, April26, 2018 L-36.com


Marine Weather and Tides
East Dennis, MA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 5:41AMSunset 7:35PM Thursday April 26, 2018 9:28 AM EDT (13:28 UTC) Moonrise 4:01PMMoonset 4:16AM Illumination 85% Phase: Waxing Gibbous; Moon at 11 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- 716 Am Edt Thu Apr 26 2018
Today..S winds 5 to 10 kt, becoming sw 10 to 15 kt with gusts up to 20 kt this afternoon. Seas 2 to 3 ft. Areas of fog this morning. Showers this morning with vsby 1 nm or less.
Tonight..W winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft.
Fri..S winds 5 to 10 kt. Seas around 2 ft. Showers likely.
Fri night..SE winds 10 to 15 kt, becoming S 5 to 10 kt after midnight. Gusts up to 20 kt. Seas around 2 ft. Patchy fog. Showers. Vsby 1 nm or less.
Sat..S winds 5 to 10 kt. Seas around 2 ft. Patchy fog. Vsby 1 to 3 nm.
Sat night..SW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. A chance of showers.
Sun..SW winds 5 to 10 kt with gusts up to 20 kt. Seas 1 to 2 ft. A chance of showers.
Sun night..W winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft.
Mon..W winds 5 to 10 kt with gusts up to 20 kt. Seas 1 to 2 ft.
Mon night..W winds 5 to 10 kt. Seas 1 to 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 Thu Apr 26 2018
Synopsis for massachusetts and rhode island coastal waters.. Low pressure lifts across new england this morning. Another low will approach from the southwest on Friday resulting in showers across the waters Friday evening, before it lifts over new england Friday night. A cold front will cross the waters late Saturday with a few showers possible. Dry high pressure will build in from the west Saturday night and 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 261114
afdbox
area forecast discussion
national weather service boston norton ma
714 am edt Thu apr 26 2018

Synopsis
A weak high pressure ridge will bring a return to mainly dry
weather later this morning through tonight with seasonable
temperatures. Another fast moving low pressure system will bring
a period of widespread showers to the region Friday afternoon
and evening. Milder temperatures return Saturday, but a cold
front will bring a brief shot of cooler air to the region Sunday
into Monday. A significant warming trend will occur Tuesday
into Wednesday with dry weather expected.

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

last of the steady rain across eastern ma will be exiting the
region over the next hour or two. Otherwise, a few spot showers
may linger this morning. Areas of fog still impacting the
region with a few localized spots where it was dense. Rapid
improvement should occur over the next few hours as increased
mixing allows drier air to scour it out. Clouds will be slower
to depart... But should see partial sunshine emerge in most areas
by afternoon.

Skies will become partly to mostly sunny this afternoon for
most areas. It will be a more typical spring day as temperatures
rebound into the middle to upper 60s across much of the region.

As winds shift to SW to W during the day, may see wind gusts up
to around 25 mph mainly during the afternoon, possibly a bit
higher for a time along the immediate S coast.

Short term 6 pm this evening through 6 am Friday
Tonight..

Weak high pressure crosses the region, so expect partly cloudy
skies on average. West winds will be briefly gusty this evening
mainly along the immediate S coast, but will become light by
around midnight.

Fast flow aloft continues as mid level long wave trough starts
to dig across the western great lakes. Noting another short wave
in this fast flow, with associated surface low pressure
shifting NE out of the carolinas after midnight.

Expect dry conditions through the night, though mid and high
clouds will increase after midnight across western areas. Low
temps will range through the lower-mid 40s, typical for late
april.

Long term Friday through Wednesday
Highlights...

* a period of widespread showers Fri afternoon eve with localized
brief heavy rainfall possible
* mainly dry and milder during the day Sat with just few showers
possible across the interior
* scattered showers possible Sat night into Sun but not a washout
* mainly dry and cool Sun night into mon
* dry with a significant warming trend Tue wed
details...

Friday and Friday night...

while much of Friday morning may end up dry... Shortwave energy
lifting northeastward will result in a period of widespread
showers focused Friday afternoon evening. Despite the shortwave
energy gradually deamplifying a modest southerly LLJ pwat axis
will develop ahead of it. Guidance has trended stronger and
further west with the axis of the LLJ along with some elevated
instability. These ingredients should combined for a period of
widespread showers Friday afternoon evening. Brief localized
heavy rainfall is possible and perhaps even an isolated t-storm
or two. Greatest risk for that will be across southeast new
england on the nose of the llj.

High temperatures may reach the lower to middle 60s for a time
during the late morning early afternoon... But readings should
drop back into the 50s once the rain arrives and some fog should
develop. The bulk of the rain should come to an end after
midnight... But areas of fog may linger.

Saturday...

an approaching cold front will result in a milder southwest
flow of air into southern new england. Partial sunshine and good
mixing ahead of the front should allow afternoon high
temperatures to reach into the upper 60s to the lower 70s away
from the marine influence of the south coast. Mainly dry weather
expected Saturday... But enough forcing marginal instability may
allow for a few showers to develop during the afternoon across
the interior.

Saturday night and Sunday...

the guidance has trended slower with the passage of the cold
frontal passage. While confidence is low... The slower movement
of the front may allow for a bit better moisture return and
perhaps a period of scattered showers Saturday night into sun.

The main idea is that while it does not look like a washout... A
period of scattered showers is certainly possible. Highs Sun may
reach well into the 50s to the lower 60s given the slower
movement of the cold front.

Sunday night and Monday...

the latest model suite has slowed the departure of the deep
upper trough across the northeast. Therefore... Cool weather is
on tap for Sunday night and Monday. Low temperatures Sun night
probably will bottom out well down into the 30s... So some frost
is possible. Highs on Monday should be mainly in the upper 50s
to around 60. Mainly dry weather expected... Although a few spot
showers are possible on Mon given cold pool aloft overhead.

Tuesday and Wednesday...

a significant warmup is still in the cards for the region as
the upper trough quickly departs and is replaced by upper level
ridging. This should allow highs to probably break 70 across
much of the region Tue and perhaps 80+ in some locations by wed.

Weak pressure gradient will likely allow for localized sea
breezes at times... Resulting in cooler temperatures along the
immediate coast. Nonetheless... Summerlike warmth is a good bet
by the middle of next week away from localized marine
influences. Dry weather is also anticipated Tue Wed as upper
level ridge will result in little synoptic forcing for any
precipitation.

Aviation 11z Thursday through Monday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through tonight ... Moderate to high confidence.

Today... Lifr conditions dominated very early this morning... But
should see improvement to high end ifr-MVFR by mid morning and
mainlyVFR by afternoon. High confidence in the improvement
given dry westerly flow mixing down... But uncertainty revolves
around the specific timing. W-sw winds will gust up to 20-25 kt
along the immediate S coast, CAPE cod and the islands as well as
the higher terrain.

Tonight...VFR conditions. W wind gusts up to around 20 kt. Mid
and high clouds increase after midnight across western areas.

Kbos terminal... High confidence in TAF but lower confidence in
timing. Lifr conditions should improve to high end ifr-MVFR by
mid morning and mainlyVFR this afternoon. Specific timing is
uncertain.

Kbdl terminal... High confidence in TAF but lower confidence in
timing. Ifr conditions should improve to MVFR by mid morning and
then mainlyVFR this afternoon.

Outlook Friday through Monday ... Moderate to high confidence.

Friday:VFR in the morning will be replaced by MVFR-ifr
conditions form west to east during the afternoon early evening
as rain showers move across the region with even the low risk of
an isolated t-storm. Areas of fog also expected to develop
late.

Friday night: mainly MVFR-ifr conditions. Shra mainly in the
evening, but areas of fog and low clouds may persist longer.

Saturday:VFR.

Saturday night:VFR. Chance shra.

Sunday:VFR. Slight chance shra.

Sunday night through Monday:VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through tonight ...

through 12z... Moderate confidence.

Small craft advisories for all waters except boston harbor and
cape cod bay. Expect e-se winds gusting up to 25 kt. Rough seas
up to 10 to 12 ft. Rain showers along with areas of fog.

Visibility locally below 1 nm at times across the southern
waters.

Today... Moderate to high confidence.

S-sw winds gusting to 25-30 kt then will briefly diminish
around midday before shifting to W and gusting up to around 20
kt mainly on the outer waters. Seas will remain at 5 feet or
greater through the day across the open waters as well as the
south bays and sounds. Visibilities at or below 1 nm at times
through mid to late morning in patchy fog and showers, then
improving.

Tonight... High confidence.

W winds gusting to 25 kt early then diminishing. Seas will
slowly subside but remain at or above 5 ft. Good visibility.

Outlook Friday through Monday ... Moderate to high confidence.

Friday: winds less than 25 kt. Seas up to 5 ft. Rain showers
develop by late afternoon with an isolated t-storm or two
possible. Areas of fog. Local visibility 1 to 3 nm.

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

Rain showers likely with perhaps isolated thunderstorm. Areas of
fog. Visibility 1 to 3 nm.

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

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

Sunday: low risk for small craft advisory winds with gusts up
to 25 kt. Seas up to 5 ft. Chance of rain showers.

Sunday night: low risk for small craft advisory winds with
gusts up to 25 kt. Seas up to 5 ft.

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

Equipment
The NOAA weather radio transmitter serving providence is out of
service due to phone line problems. The phone company has
prioritized the issues and is working to get the weather
broadcast back on the air as soon as possible. The transmitter
serving hyannis is back in service.

Box watches warnings advisories
Ct... None.

Ma... Dense fog advisory until 9 am edt this morning for maz020>024.

Ri... Dense fog advisory until 9 am edt this morning for riz006>008.

Marine... Small craft advisory until 10 pm edt this evening for anz232.

Small craft advisory until 1 am edt Friday for anz233-234.

Small craft advisory until noon edt today for anz236.

Small craft advisory until 6 pm edt Friday for anz235-237-250-
254>256.

Small craft advisory until 2 am edt Friday for anz251.

Synopsis... Evt frank
near term... Frank evt
short term... Evt
long term... Frank
aviation... Evt frank
marine... Evt frank
equipment... Staff


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 11 mi29 min 45°F
44020 - NANTUCKET SOUND 22 mi99 min SW 9.7 G 14 49°F 46°F2 ft1002.6 hPa (+0.6)49°F
WAXM3 - Waquoit Bay Reserve, MA 23 mi104 min 1.9 53°F 1003 hPa53°F
BZBM3 - 8447930 - Woods Hole, MA 31 mi41 min 49°F 47°F1002.7 hPa
NTKM3 - 8449130 - Nantucket Island, MA 32 mi41 min SW 8.9 G 12 54°F 50°F1003.2 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 32 mi39 min S 12 G 14 47°F 4 ft1001.8 hPa (-0.3)47°F
44013 - BOSTON 16 NM East of Boston, MA 49 mi39 min S 7.8 G 9.7 48°F 44°F3 ft1001.2 hPa (-0.4)48°F

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA8 mi33 minSSW 40.25 miFog54°F54°F100%1002 hPa
Chatham, Chatham Municipal Airport, MA10 mi37 minSW 40.25 miFog52°F52°F100%1003.2 hPa
Provincetown Municipal Airport, MA18 mi33 minS 910.00 miLight Rain53°F52°F96%1002.2 hPa
Otis Air National Guard Base, MA20 mi34 minSW 101.75 miFog/Mist55°F55°F100%1002.7 hPa

Wind History from HYA (wind in knots)
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53CalmSE3S4S3S4
1 day agoS8S8S11S11
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S11S10S5S6S73SE3CalmSE45SE5SE5SE8
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2 days agoN10N8N7NE7N6N6SE11SE8SE7S5S4S6S5SW5S4S5S5CalmNE3CalmCalmCalmSW8S7

Tide / Current Tables for Sesuit Harbor, East Dennis, Cape Cod Bay, Massachusetts
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Sesuit Harbor
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Thu -- 02:44 AM EDT     0.28 feet Low Tide
Thu -- 04:16 AM EDT     Moonset
Thu -- 05:44 AM EDT     Sunrise
Thu -- 09:05 AM EDT     10.51 feet High Tide
Thu -- 03:16 PM EDT     -0.09 feet Low Tide
Thu -- 04:01 PM EDT     Moonrise
Thu -- 07:33 PM EDT     Sunset
Thu -- 09:39 PM EDT     10.50 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.22.60.70.31.335.37.99.810.5108.66.43.71.2-00.31.63.76.48.810.210.49.5

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Thu -- 12:54 AM EDT     0.00 knots Slack
Thu -- 04:15 AM EDT     Moonset
Thu -- 04:27 AM EDT     1.89 knots Max Flood
Thu -- 05:43 AM EDT     Sunrise
Thu -- 07:17 AM EDT     -0.00 knots Slack
Thu -- 10:13 AM EDT     -1.66 knots Max Ebb
Thu -- 01:15 PM EDT     0.00 knots Slack
Thu -- 04:00 PM EDT     Moonrise
Thu -- 04:55 PM EDT     2.15 knots Max Flood
Thu -- 07:32 PM EDT     Sunset
Thu -- 07:53 PM EDT     -0.00 knots Slack
Thu -- 10:51 PM EDT     -1.74 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.80.10.91.51.81.81.30.3-0.7-1.4-1.7-1.6-1.1-0.20.71.522.11.81-0.1-1.1-1.6-1.7

Weather Map and Satellite Images
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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (9,2,3,4)
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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.