Friday, April20, 2018 L-36.com


Marine Weather and Tides
Kupreanof, AK

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 5:26AMSunset 8:26PM Friday April 20, 2018 12:32 PM AKDT (20:32 UTC) Moonrise 8:49AMMoonset 12:57AM Illumination 29% 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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PKZ035 Sumner Strait- 834 Am Akdt Fri Apr 20 2018 Updated
Today..E wind 10 kt. Seas 2 ft or less, except 5 ft near ocean entrances.
Tonight..W wind 10 kt. Seas building to 3 ft late.
Sat..E wind 10 kt becoming S in the afternoon. Seas 2 ft or less.
Sat night..SE wind 20 kt. Seas 4 ft. Rain showers.
Sun..SE wind 25 kt. Seas 5 ft.
Mon..SE wind 25 kt diminishing to 15 kt. Seas 4 ft.
Tue..S wind 20 kt. Seas 4 ft.

7 Day Forecast for Marine Location Near Kupreanof, AK
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location: 56.65, -133.15     debug


Area Discussion for -
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Fxak67 pajk 201402
afdajk
southeast alaska forecast discussion
national weather service juneau ak
602 am akdt Fri apr 20 2018

Short term Cold air aloft and showers could bring some slushy
mix to the rain showers early this morning, coupled with the
diurnal low temperatures. Air and ground temperatures will
restrict any ability for snow accumulation. Snow accumulations
will be limited to higher elevations around 1000 feet rising to
around 1800 feet in the southern areas.

Showers continue over the panhandle through Saturday and beyond,
as you can read about in the long term. For those looking for a
break in the weather, may be happy to know that there is a
diminishing trend on the showers tonight and Saturday. For mainly
the central areas up through skagway haines, there are even
chances for clear sunny breaks and for the showers to be absent
long enough to allow surfaces to dry out. But don't leave your
raincoat behind, there will always be the risk for isolated to
scattered showers. Another tricky issue we considered was fog
forming with the cloud breaks. Decreased clouds and pop by about
10-20 percent more than models showed, resulting in partly to
mostly cloudy skies and scattered showers over the central area
with more cloudiness showers bookending the panhandle. Confidence
was too low to include any mention of fog in the forecast for
tonight and Saturday morning, some models hint at it while others
do not.

A notable change that was needed was to the winds originating
down through hecate strait. The area of gales will move north
through the afternoon, by this evening the tongue of strong winds
stops its advancement at the dixon entrance clarence strait border
area. It will only reach SCA at 30 kt tonight, for the most
extreme southern portion of clarence strait. Lingering SCA in lynn
canal ending this morning, SCA due to seas continue along the
outer coastal marine areas.

Models are continuing to be a close agreement and are holding a
steady course. The alaska nbm was showing a good level headed
approach to the quickly developing low bringing up enhanced winds
in hecate strait dixon entrance. Many of the other changes were
using model guidance and manually manipulating the different
elements of the forecast.

Long term Sunday through Friday as of 10 pm Thursday upper
trof will generally remain over the gulf of ak and NE pac through
long term period. A couple of occluded fronts will move into the
area, with first one affecting the area sun-mon, and second one
on tue-wed. Models are in better agreement on these features, and
are showing stronger systems with both. Used 18z GFS nam blend for
sun, then mainly wpc for Sun night onward.

With the stronger systems during first half of long term,
increased winds associated with both, with the second system
getting a bigger wind boost. First occluded front will likely have
one or more low pressure waves moving N along it as upper trof
takes on a more negative tilt, but models differ on timing of
them, so for now have left that detail out. Still, looks like gale
force winds for the gulf, and possibly over parts of the inner
channels as well. First front will be a slow mover due to flow
aloft becoming more parallel to it, so a more prolonged period of
significant rainfall is likely. With the tue-wed front, increased
winds 10+ kt for much of the area, and now have near gale force
winds for the gulf. Models differ on how far SE the front gets
before potentially stalling or falling apart, which would have big
impact on where most significant winds and rainfall will occur.

Late in the period, upper trof remains over the gulf of ak and ne
pac, but models differ on any additional systems moving through
it after thu. Still, looks like a wet long range period overall,
which should help to alleviate some of the short and long term
rainfall deficits over SE ak.

Ajk watches warnings advisories
Public... None.

Marine... Small craft advisory for pkz012-013-036-051-052.

Small craft advisory due to seas for pkz022-041>043-053.

Kv rwt
visit us at http:

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LCNA2 - Lincoln Rock, AK 48 mi82 min SSE 9.9 G 13 1009.5 hPa
FFIA2 - Five Finger, AK 50 mi32 min SW 4.1 G 5.1 42°F 1010.8 hPa (-1.1)

Wind History for Port Alexander, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petersburg, AK16 mi36 minE 410.00 miPartly Cloudy44°F35°F71%1011.6 hPa

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Last 24hrCalm4S10
G18
S9
G26
S7S66S11S8W9S5NW4SE3E4CalmSW4SW3CalmCalmW4Calm4NE6E4
1 day agoCalmNE3SE4E3CalmSE53E4SE4SE45E7E5E7SE5CalmSE7E8
G15
E6SE5E655E4
2 days agoE4NE6E5E4Calm3SW5SW7SW8CalmCalmCalmCalm3CalmCalmCalmCalmCalmNW3NW3NE3NE5Calm

Tide / Current Tables for Castle Islands, Duncan Canal, Alaska
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Castle Islands
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Fri -- 12:56 AM AKDT     Moonset
Fri -- 04:33 AM AKDT     16.36 feet High Tide
Fri -- 05:32 AM AKDT     Sunrise
Fri -- 08:49 AM AKDT     Moonrise
Fri -- 10:53 AM AKDT     -1.46 feet Low Tide
Fri -- 05:33 PM AKDT     13.75 feet High Tide
Fri -- 08:12 PM AKDT     Sunset
Fri -- 10:57 PM AKDT     3.26 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
58.211.614.416.116.214.310.76.42.2-0.6-1.4-0.42.25.69.111.913.513.6129.26.343.3

Tide / Current Tables for Grief Island, Duncan Canal, Alaska
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Grief Island
Click for Map
Fri -- 12:55 AM AKDT     Moonset
Fri -- 04:19 AM AKDT     16.58 feet High Tide
Fri -- 05:31 AM AKDT     Sunrise
Fri -- 08:49 AM AKDT     Moonrise
Fri -- 10:51 AM AKDT     -1.45 feet Low Tide
Fri -- 05:19 PM AKDT     13.85 feet High Tide
Fri -- 08:11 PM AKDT     Sunset
Fri -- 10:53 PM AKDT     3.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.48.812.21516.516.113.910.25.91.9-0.7-1.4-0.22.56.19.712.413.813.511.68.863.93.3

Weather Map and Satellite Images
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wmap_P
GOES Local Image of PacificNorthwest    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 (16,3,4,5)
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Ground Weather Radar Station Biorka Is., AK
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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.