Saturday, November18, 2017 L-36.com


Marine Weather and Tides
Seldovia Village, AK

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 9:14AMSunset 4:15PM Saturday November 18, 2017 10:19 AM AKST (19:19 UTC) Moonrise 7:58AMMoonset 4:25PM Illumination 0% Phase: New Moon; Moon at 29 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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PKZ141 Kachemak Bay- 344 Am Akst Sat Nov 18 2017
.small craft advisory Sunday...
Today..N wind 15 kt. Seas 2 ft.
Tonight..NE wind 10 kt. Seas 2 ft.
Sun..NE wind 15 kt becoming N 25 kt in the afternoon. Seas 2 ft building to 4 ft in the afternoon. Snow.
Sun night..N wind 25 kt. Seas 4 ft.
Mon..N wind 25 kt. Seas 3 ft.
Tue through Wed..N wind 15 kt. Seas 2 ft.

7 Day Forecast for Marine Location Near Seldovia Village, AK
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location: 59.25, -151.43     debug


Area Discussion for -
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Fxak68 pafc 181431
afdafc
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
531 am akst Sat nov 18 2017

Analysis and upper levels
A gulf low departing into the northeast pacific this morning is
helping to dig a longwave trough centered over the alcan border
region while a ridge builds over the central bering sea. This has
allowed the bulk of the southern mainland to return to a more
amplified offshore flow pattern, leaving gusty outflow winds along
the gulf coast as the primary sensible weather impact. Skies have
cleared out over southcentral ak once again with the exception of
some patchy fog and stratus lingering over parts of cook inlet
and the matanuska valley. Skies are mostly overcast across
southwest ak as mid level cloud cover streams in over the top of
the bering ridge. A warm front associated with a low over far
eastern russia extends southeast along the kuskokwim delta
coastline and is poised to bring another round of mixed
precipitation to the delta as it moves inland today. A trailing
cold front is making slow eastward progress through the western
aleutians.

Model discussion
Models are in generally good short term agreement as the pattern
remains very progressive over the coming days. The bering sea
ridge will quickly break down this weekend as a strong upper level
wave drops out of the bering strait region Saturday night and
moves into the western gulf on Sunday, spreading significant
winter weather and strong winds over a wide swath of the eastern
bering and southwest ak. Some differences remain regarding the
placement of a surface low developing east of kodiak Sunday
morning, which will have large implications on precipitation type
and intensity for kodiak island. Preferred the GFS solution as
somewhat of a middle ground for the morning forecast package.

Aviation
Panc...VFR conditions and light northerly winds will persist
through late Saturday night. Snow will spread back into the
terminal from the west early Sunday morning, dropping conditions
to MVFR ifr after 12z.

Short term forecast southcentral alaska (days 1 through 3)
Strong gap outflow conditions and gales over the western gulf
will weaken through today as surface pressure gradients and upper
wind support wanes. The focus then turns to the frontal trough and
associated triple point center moving into the western gulf
tonight. Models are initially in agreement with the occluded
portion of the front as it spreads overrunning snow to
southcentral beginning Sunday morning. The triple point is another
matter. The preferred solution is to take the triple point which
develops near kodiak island Sunday morning and carry it just to
the east and then retrograde the system to the west southwest some
Sunday night. This will be a fairly strong low that will bring
gales and storm force winds to the gulf waters Sunday and Sunday
night. The result of this solution for the southcentral mainland
would be to spread snow to along the north gulf coast through
Sunday afternoon with the heaviest over the kenai peninsula. Snow
amounts may approach advisory levels over the western kenai by
Sunday afternoon. Snow will tapper off throughout the evening and
overnight hours over the mainland and be followed outflow winds
along the north gulf coast.

Kodiak island will likely see warm advection with a mix of rain
and snow with the front and developing triple point Sunday. The
preferred solution of keeping the low just to the east would
likely hold out any significant cold advection and tend to keep
the precipitation mixed or a very wet snow. So with the strong
winds moving in we are not expecting significant reductions in
visibilities in blowing snow with the strong northerly winds
develop during Sunday and Sunday night. A slight change in track
however would result in potential heavier snowfall and significant
blowing snow. Stay tuned for updates.

Short term forecast southwest alaska (days 1 and 2)
The storm expected to impact southwest alaska remains on track.

The storm's center is still over eastern russia, however the
storm's warm and cold fronts extend well south of the center of
the low across the bering. The warm front is over the eastern
bering, and is responsible for the snow and mixed precipitation
already being reported along the coast this morning. The cold
front and arguably the bigger weather maker is the cold front now
racing across the western bering. As the warm front slowly pushes
into mainland southwest alaska, the snow will change over to rain
first at the coast and gradually through much of the kuskokwim
delta west of the kuskokwim mountains. During that transition from
snow to rain this afternoon, a brief period of freezing rain is
possible, but the warm air is expected to scour out the
subfreezing surface air quickly, with a little help from the weak
november sun.

Further south through bristol bay, snow will begin around midday
and push eastward to the alaska range by the evening. At the
coast, the warm air will transition the snow to rain during the
afternoon, but with slightly weaker onshore winds, it will have
more difficulty scouring out all of the cold air. Thus a longer
duration freezing rain is expected north of king salmon through
koliganek, new stuyahok, and igiugig, though ice accumulations
should remain less than a tenth of an inch with a wide variety of
precipitation types expected. Inland bristol bay and the entire
kuskokwim valley are still expected to pick up close to a foot of
loose, powdery snow. In the windier areas, that will cause blowing
snow concerns both as the snow is falling and well after the storm
ends through Monday morning.

The cold front will race across the bering today and reach the
coast tonight. It is the leading edge of very cold air, which
coupled with the rapidly intensifying low over the bering strait
will cause a large area of storm force winds with gusts over
hurricane force. This is most likely in southwest alaska along the
coast of the kuskokwim delta and especially nunivak island.

Short term forecast bering sea aleutians (days 1 and 2)
A storm over russia with distinct warm and cold fronts over the
bering are the primary weather features this morning. The warm
front will move into southwest alaska this morning. The cold front
and the arrival of a much colder air mass will be the catalysts
for strong winds across much of the bering. The first land to be
impacted will be the pribilofs. The cold front will race through
this afternoon, but the highest winds will really be associated
with the strengthening low over the bering strait late Saturday
night that will dramatically increase the winds out of the
northwest late tonight through Sunday morning. A few hours later,
those same winds will reach the alaska peninsula and eastern
aleutians, where gusts as high as 90 mph through bays, passes, and
channeled terrain will be possible.

The strong winds associated with the low will diminish late Sunday
night through Monday morning as another area of warm high pressure
builds over the central and western bering. Yet another low
tracking along the russian coast will cause yet another cold front
with another blast of cold air on strong winds to traverse the
bering Monday for the western bering and Monday night for the
remainder of the bering, though these strong winds will be more
out of the west.

Long term forecast (days 3 through 7)
Expect near to below normal temperatures with periodic snow across
the southwest, and periodic cloudiness for southcentral alaska.

Gap winds will pulse up with every exiting disturbance.

Monday evening begins day 3 with an exiting system in the gulf of
alaska. Dry conditions will take hold over much of southern alaska
within an outflow pattern, mainly along the north gulf coast.

Overall, the upper level pattern remains very progressive with
strong, discrete disturbances propagating from the northwest
pacific into the bering sea. Each of these systems will send a
surface low pressure east of kamchatka while sending a front from
west to east across the bering. However, troughing from northwest
canada southward will turn the storm track from the bering into
the gulf of alaska. As far as sensible weather is concerned, the
periodic fronts will push snow onto the mainland while the front
falls apart as it moves west to east.

Afc watches warnings advisories
Public... High wind warning: 155 181 185 195
winter weather advisory: 121 152 161
marine... Storms: 131 132 155 165 170 172 179 180 181 185 412 414
gales: 119 120 138 150 160 171 173 174 178 351 352 411 413
synopsis and model discussion... Cb
southcentral alaska... Rmc
southwest alaska bering sea aleutians... Jpw
long term... Tp


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FILA2 - Flat Island Light, AK 30 mi50 min NNE 22 G 25 35°F 1012.5 hPa22°F
46108 - Central Cook Inlet - 175 32 mi42 min 46°F2 ft

Wind History for Nikiski, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Seldovia, Seldovia Airport, AK19 mi27 minN 910.00 miFair31°F17°F56%1013.8 hPa

Wind History from ASO (wind in knots)
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Last 24hrCalmN6N7N9N43--N7N63CalmCalmN8N8N5N5N12
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G17
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1 day agoN4CalmCalmSE6SE666NE7
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N9N6N5N7N4N6N7NE3N6N6N33Calm3N5N9
2 days agoCalmN5N7N6N75N5N6N4N6CalmCalmCalmCalmCalmCalmCalmCalm5--CalmN5CalmCalm

Tide / Current Tables for Picnic Harbor, Rocky Bay, Alaska
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Picnic Harbor
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Sat -- 01:32 AM AKST     12.13 feet High Tide
Sat -- 02:42 AM AKST     New Moon
Sat -- 07:05 AM AKST     2.38 feet Low Tide
Sat -- 08:57 AM AKST     Moonrise
Sat -- 09:07 AM AKST     Sunrise
Sat -- 01:07 PM AKST     14.12 feet High Tide
Sat -- 04:33 PM AKST     Sunset
Sat -- 05:25 PM AKST     Moonset
Sat -- 07:39 PM AKST     -1.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.611.91210.88.65.83.42.43.15.48.311.113.214.113.611.78.75.11.6-0.7-10.53.36.4

Tide / Current Tables for Port Chatham, Cook Inlet, Alaska
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Port Chatham
Click for Map
Sat -- 01:47 AM AKST     14.50 feet High Tide
Sat -- 02:42 AM AKST     New Moon
Sat -- 07:23 AM AKST     2.12 feet Low Tide
Sat -- 08:58 AM AKST     Moonrise
Sat -- 09:08 AM AKST     Sunrise
Sat -- 01:31 PM AKST     15.67 feet High Tide
Sat -- 04:35 PM AKST     Sunset
Sat -- 05:27 PM AKST     Moonset
Sat -- 07:52 PM AKST     -1.65 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.713.914.513.310.67.242.32.54.47.410.713.715.415.513.710.46.22.1-0.8-1.6-0.42.46

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
npac_satellite

GOES Local Image of Alaska    EDIT
Geos

Ground Weather Radar Station Kenai, 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.