Friday, August18, 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 6:17AMSunset 9:48PM Friday August 18, 2017 7:42 PM AKDT (03:42 UTC) Moonrise 1:15AMMoonset 5:39PM Illumination 10% Phase: Waning Crescent; Moon at 26 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- 332 Pm Akdt Fri Aug 18 2017
Tonight..SE wind 10 kt increasing to 15 kt after midnight. Seas 2 ft.
Sat..E wind 15 kt. Seas 2 ft.
Sat night..NE wind 10 kt becoming N after midnight. Seas 4 ft. Patchy fog.
Sun..N wind 15 kt. Seas 4 ft.
Sun night..N wind 10 kt. Seas 3 ft.
Mon..NW wind 10 kt. Seas 3 ft.
Tue..S wind 10 kt. Seas 2 ft.
Wed..SW wind 15 kt. Seas 2 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 190108
afdafc
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
508 pm akdt Fri aug 18 2017

Analysis and upper levels
A broad cold upper level trough encompasses much of the alaska
mainland, with an upper level low centered in the chukchi sea and
a second upper level wave that is centered near king salmon. At
the surface a weak front is pushing in along the north gulf of
alaska coast. Both features are helping to support widespread
showers along the north gulf coast and also across bristol bay
near king salmon. Meanwhile a low is moving northwards from the
north pacific ocean into the central aleutians and bringing some
gusty winds and showers. Meanwhile high pressure dominates across
the western and central bering.

Model discussion
Models are in generally good agreement in the short term but begin
to drift in the position and intensity of a low pressure system as
it pushes into the gulf of alaska late Sunday night into Monday.

This will have important implications for wind gust intensity
along the north gulf coast and prince william sound, and also for
rainfall across southcentral.

Aviation
Panc... A band of rain is moving towards anchorage which will
begin to impact the area by afternoon. Currently southeast flow is
expected to persist into the evening hours, which will help to
keep higher ceilings even as the rain approaches. Gusty southeast
winds will slowly diminish by the evening hours.

Short term forecast southcentral alaska (days 1 and 2)
Cool and rainy conditions will persist overnight as a vigorous
upper level shortwave trough swings through southcentral bringing
a wide swath of precipitation up the cook inlet and into prince
william sound. A surface low will form off the east coast of the
kenai peninsula this evening and move northeast tonight. Winds
wrapping around the top of the low will temporally form a weak
easterly barrier jet along the northern gulf coast with increased
winds extending into southern portions of prince william sound.

The upper level trough and associated surface low move off to the
northeast tomorrow morning, with precipitation tapering off across
the region after midnight, though rain will linger along the gulf
coast through Saturday afternoon.

The next system approaches the region on Sunday as a deep upper
level low dropping down from the arctic merges with the remnants
of tropical cyclone banyan moving in from the northern pacific. A
large swath of moisture will slam into the gulf coast by Sunday
afternoon leading to periods of very heavy rain through most of
the day on Monday. The heaviest precipitation will be focused
along the northern gulf coast, the prince william sound, and the
northeastern coast of the kenai peninsula. Precipitation is also
expected to make its way into the anchorage and mat-su on Monday,
though there is still some uncertainty regarding the timing and
amount of rain for locations on the west side of the chugach.

Short term forecast southwest alaska (days 1 and 2)
Expecting a fetch of moisture which is currently over the bering
to get entrained into the back side of the midlevel low bringing
precipitation into the ak peninsula tonight. A broad vortex over
western ak will continue to amplify enabling cooler air aloft to
work its way deeper into southwest alaska. Unsettled weather will
persist for the next few days as cooler air associated with the
trough moves southward. Between the embedded shortwaves and the
diurnal heating at the surface, the dynamics will be present to
support showers. Temperatures will hover near or slightly below
average for this time of year.

Short term forecast bering sea aleutians (days 1 and 2)
South of kiska, there is a closed low that is progged to move
eastward and slowly deepen. In its wake, expect ridging which
will keep a stable and relatively warm air mass in place. The
aleutian chain and portions of the bering can anticipate more fog
and stratus. The ridge axis will persist into next week keeping
the areas of pesky fog in place.

Long term forecast (days 4 through 7)
Beginning the extended period forecast Monday night, there will be
a closed upper low over the north gulf of alaska with a shortwave
ridge axis over the eastern bering sea. Expect showery and mostly
cloudy cool conditions to be over southcentral with drier weather
over southwest. Tuesday and Wednesday will be a transition period
as southern alaska moves into weak shortwave ridging as the upper
low weakens and moves east. Another trough over the bering sea
will move toward southwest alaska on Wednesday and eventually dig
south toward kodiak island through the remainder of the week. This
will keep a wet pattern in place across coastal regions with
clouds and rain chances for inland areas. The degree of downslope
flow for interior locations remains somewhat uncertain at this
point as the low track and placement will modulate that factor,
but it still looks wetter and cooler for most of interior southern
alaska for the foreseeable future.

Afc watches warnings advisories
Public... None.

Marine... None.

Fire weather... None.

Synopsis and model discussion... En
southcentral alaska... Kwv
southwest alaska bering sea aleutians... Ps
long term... Ja


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
UNLA2 - 9462620- Unalaska, AK 1 mi43 min SSE 8.9 G 14 56°F 49°F1007.7 hPa

Wind History for Unalaska, AK
(wind in knots)    EDIT      (on/off)   Help
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SW11
G20
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G18
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SW10
G15
SW7
G12
SW12
G19
W10
G14
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G17
SW8
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G12
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E2
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G6
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G5
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SW6
G12
NE6
G11
W5
G14
SW9
G17
W11
G19
W21
G38
W29
G39
W18
G26
W14
G26
SW12
G22
SW11
G26
W19
G26
W20
G34
W10
G21
SW12
G17
SW8
G24
S16
G23
S14
G24
S6
G17
SW17
G26
SW18
G28
SW7
G20
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G28
SW17
G22
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SW9
G15
W9
G14
SW9
G14
W6
G9
W6
G15
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G17
W6
G13
W6
G15
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G12
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G14
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G17
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G14
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G23
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G16
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G11
NW10
G20
NW13
G19
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G19
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NW9
G21
NW14
G23
NW15
G20
W7
G15

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Unalaska, Unalaska Airport, AK1 mi47 minSSE 710.00 miMostly Cloudy56°F46°F72%1007.8 hPa

Wind History from ADU (wind in knots)
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Last 24hrSW18SW16SW14SW13SW12
G19
SW11
G19
SW14SW16S12SW8S5SW6S8S6S3CalmE6E6NW4NW4CalmNW63S7
1 day agoW12NW19
G25
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G16
4SW11SW18
G26
SW16
G32
W12
G26
W15
G24
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G17
SW11W16
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W18W17W10
G18
S8SW7
G20
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SW18SW14S19
G24
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2 days agoSW14
G18
SW12SW13SW6SW9SW13W11
G15
W7SW5SW7W8W9W16W16
G21
NW13
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W10W11NW12
G18
W14W20
G24
W17
G25
W17
G21
W16
G25
W14
G24

Tide / Current Tables for Dutch Harbor, Alaska (expired 1988-12-31)
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Dutch Harbor
Click for Map
Fri -- 01:59 AM AKDT     3.97 feet High Tide
Fri -- 04:15 AM AKDT     Moonrise
Fri -- 07:50 AM AKDT     Sunrise
Fri -- 09:45 AM AKDT     -1.08 feet Low Tide
Fri -- 05:13 PM AKDT     2.94 feet High Tide
Fri -- 08:38 PM AKDT     Moonset
Fri -- 09:13 PM AKDT     2.31 feet Low Tide
Fri -- 10:27 PM AKDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.53.843.83.32.41.40.4-0.4-1-1.1-0.8-0.10.71.62.32.72.92.92.72.42.32.42.6

Tide / Current Tables for Kisselen Bay, Beaver Inlet, Unalaska Island, Alaska
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Kisselen Bay
Click for Map
Fri -- 04:16 AM AKDT     Moonrise
Fri -- 06:33 AM AKDT     -0.90 feet Low Tide
Fri -- 07:51 AM AKDT     Sunrise
Fri -- 02:16 PM AKDT     4.26 feet High Tide
Fri -- 06:00 PM AKDT     2.71 feet Low Tide
Fri -- 08:38 PM AKDT     Moonset
Fri -- 10:27 PM AKDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.64.93.72.31-0.2-0.8-0.9-0.40.51.52.63.444.24.13.632.72.93.44.14.95.5

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.