Saturday, November18, 2017 L-36.com


Marine Weather and Tides
Unalaska, 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 5:03 AM AKST (14:03 UTC) Moonrise 7:38AMMoonset 4:51PM 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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PKZ171 Unalaska Bay- 359 Am Akst Sat Nov 18 2017
.gale warning tonight and Sunday...
Today..SW wind 10 kt increasing to 15 kt in the afternoon. Seas 2 ft.
Tonight..W wind 25 kt becoming nw 40 kt with gusts to 55 kt by midnight. Seas 11 ft building to 15 ft after midnight. Rain.
Sun..NW wind 45 kt. Gusts to 60 kt. Seas 24 ft.
Sun night..NW wind 50 kt. Seas 24 ft.
Mon..NW wind 35 kt. Seas 13 ft.
Tue..NW wind 20 kt. Seas 7 ft.
Wed..SW wind 30 kt. Seas 5 ft.

7 Day Forecast for Marine Location Near Unalaska, AK
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location: 53.89, -166.54     debug


Area Discussion for -
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Fxak68 pafc 180148
afdafc
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
448 pm akst Fri nov 17 2017

Analysis and upper levels
There is a vertically stacked low over the northeast gulf, with a
trough extending north into the yukon territory. There is also an
upper level ridge over the central bering and central aleutians.

There is an upper level low over northeast russia. An associated
weather system is over the kamchatka peninsula. The warm front
with this system is over the north central bering, and the cold
front is over the western bering and western aleutians. Northerly
flow aloft is over southern alaska, with a fairly strong offshore
gradient at the low levels. Some clouds and precipitation are
banked up against the northern and western slopes of the alaska
range, and most of the remainder of southern alaska is dry.

Model discussion
The numerical models are in rather good agreement through the
short term portion of the forecast (Sunday afternoon). The models
seem to finally have a good handle on the developing triple point
low in the gulf on Sunday, and then begin to diverge on Sunday
afternoon on the exact location of the surface low. Forecast
confidence is thus higher than normal.

Aviation
Panc... Overall,VFR conditions should persist through Saturday
evening. However, areas of fog are hovering just north of the
airport late Fri afternoon and may come in and out of the airport
through the evening. Increasing northerly winds are expected to
develop Friday evening and then persist into Saturday evening
which should clear out the remainder of the stratus as the mix
the atmosphere (though at first these winds may just push the
stratus into the airport at times this evening.)

Short term forecast southcentral alaska (days 1 through 3)
Outflow winds along the north gulf coast will be the primary
concern tonight and Saturday as weak high pressure begins to move
into the mainland. This will leave a persistent pressure gradient
along the coast. The strongest winds of these should occur near
seward, whittier, and valdez thompson pass areas where gusty
outflow winds are expected to increase again this evening, then
begin to diminish on Saturday. The low stratus and fog that
developed in the cook inlet region yesterday behind the snow is
also beginning to slowly break up, however confidence is low that
this clearing will continue through the night. As a result it's
possible that this layer may continue in spots into Saturday but
confidence in either solution is low.

The focus then shifts to the development of the triple point low
near kodiak late Saturday night. The models are beginning to come
into better agreement with the track of this low somewhere in the
central gulf before descending into the north pacific. The main
concern in the exact placement of this low is with kodiak island
and the potential for blowing snow, as previous runs of the gfs
kept the low just offshore, leaving the area under a persistent
band of snow with gusty northwesterly winds. Later runs however
are trending east with this low, leaving a bulk of the
precipitation and winds over the waters of the gulf. Model trends
will need to be closely monitored, as trends back to the west will
result in significantly more snow wind for kodiak island on
Sunday. This triple point low and its associated upper level
trough will also bring the next round of snowfall into
southcentral for the day on Sunday, with widespread accumulations
expected with no downsloping present to protect the lee side of
the chugach. This portion of the system bears watching as well as
guidance is hinting at the possibility for advisory level
snowfall, especially to the kenai peninsula along with the gusty
northerly winds.

Short term forecast southwest alaska (days 1 and 2)
Weak, cold, northerly flow will continue over southwest alaska
until a warm front moves in over the area Saturday. The parent low
for this system will move over the bering strait Saturday
afternoon then rapidly intensify as it moves towards the norton
sound area. During this time its front will push across southwest
alaska.

The front will be warm enough to change over some of the precip
along the southwest coast to rain, but the majority of southwest
alaska will stay snow. This front will move slowly over interior
portions of southwest alaska allowing enough time for snow totals
around 10 inches for areas from king salmon north through the
lower kuskokwim valley.

Meanwhile, strong cold air advection and favorable upper level
dynamics will allow for strong winds along the kuskokwim delta
coast early Saturday morning. These winds will last into Sunday
afternoon before tapering off as the main low drifts south into
the gulf.

Short term forecast bering sea aleutians (days 1 and 2)
High pressure over the southern bering is retreating into the
north pacific which will make way for a front to push through the
eastern bering and alaska peninsula from the low moving towards
norton sound. A favorable jet position, cold air advection and
other upper level dynamics will bring strong winds to areas all
around the eastern bering.

The first to see these winds will be the pribilof islands which
will amp up Saturday night and last into Sunday afternoon. The
front will then push south bringing strong winds to the eastern
aleutians and alaska peninsula early Sunday morning. Strong winds
for these locations will last into Sunday evening before
diminishing. Winds for all three locations have the potential to
reach warning level.

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 a system exiting 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 195.

High wind watch 155 181 185.

Winter weather advisory 152 161.

Marine... Gale 127 128 130-132 138 150-175 180.

Storm 179 181 185.

Synopsis and model discussion... Bl
southcentral alaska... Dek
southwest alaska bering sea aleutians... Dk
long term... Mtl


Weather Reporting Stations
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Wind History for Unalaska, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Unalaska, Unalaska Airport, AK1 mi67 minE 510.00 miFair43°F37°F82%1027.1 hPa

Wind History from ADU (wind in knots)
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Last 24hrNW19NW17--N15--NW13
G22
CalmS7W5----E3E3--Calm--CalmS5SW3S93----E5
1 day ago--NW16
G24
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G32
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G27
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W22NW17NW13
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6SW6W10W5NW6----N17NW15
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2 days agoNW15--NW12NW16NW17NW15NW13NW15NW18
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G31
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G27
NW18
G34
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G24
NW17
G25

Tide / Current Tables for Dutch Harbor, Alaska (expired 1988-12-31)
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Dutch Harbor
Click for Map
Sat -- 12:00 AM AKST     0.40 feet Low Tide
Sat -- 02:42 AM AKST     New Moon
Sat -- 08:16 AM AKST     3.69 feet High Tide
Sat -- 09:37 AM AKST     Moonrise
Sat -- 09:40 AM AKST     Sunrise
Sat -- 12:47 PM AKST     3.26 feet Low Tide
Sat -- 04:14 PM AKST     3.46 feet High Tide
Sat -- 06:02 PM AKST     Sunset
Sat -- 06:51 PM AKST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.50.91.52.12.73.23.63.73.73.53.43.33.33.33.43.53.43.22.92.41.81.20.7

Tide / Current Tables for Kisselen Bay, Beaver Inlet, Unalaska Island, Alaska
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Kisselen Bay
Click for Map
Sat -- 02:42 AM AKST     New Moon
Sat -- 05:16 AM AKST     4.96 feet High Tide
Sat -- 09:19 AM AKST     3.48 feet Low Tide
Sat -- 09:37 AM AKST     Moonrise
Sat -- 09:39 AM AKST     Sunrise
Sat -- 01:12 PM AKST     4.75 feet High Tide
Sat -- 06:03 PM AKST     Sunset
Sat -- 06:51 PM AKST     Moonset
Sat -- 09:32 PM AKST     0.26 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.92.83.74.34.854.84.33.83.53.63.94.44.74.74.43.93.12.31.40.70.30.30.6

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 Bethel, AK
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weather_mapweather_map weather_map

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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.