Thursday, May25, 2017 L-36.com


Marine Weather and Tides
Atka, AK

Version 3.4
What's New / NOTES
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 4:42AMSunset 11:11PM Thursday May 25, 2017 8:10 AM AKDT (16:10 UTC) Moonrise 5:10AMMoonset 8:45PM Illumination 0% Phase: New Moon; Moon at 0 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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7 Day Forecast for Marine Location Near Atka, AK
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location: 52, -175.32     debug


Area Discussion for -
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Fxak68 pafc 251243
afdafc
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
443 am akdt Thu may 25 2017

Analysis and upper levels
An upper level trough begins to push into the southern mainland
this morning from the eastern bering sea, with ridging over
southeast alaska continuing to progress further eastward. At the
surface, a weakening front dissipating over the northern gulf
coast continues to bring some showery and gusty conditions to the
area as seen with radar imagery and observations. Another
weakening front is tracking into the southwest mainland from the
eastern bering, keeping onshore flow and another round of showery
conditions over the area. Further west, a weak surface low over
the western aleutians has pushed further eastward into the central
aleutians, bringing some rain and gusty winds to the area.

Model discussion
Model guidance overall is in fairly good agreement with the timing
of synoptic features through the remainder of the week. However,
models begin to show some differences going into the weekend with
regards to a low south of the western aleutians and another low
south of the alaska peninsula. These discrepancies have caused
some uncertainty with mainly the timing and amounts of
precipitation moving over the western central aleutians and over
the gulf coast southern mainland over the weekend. With that said,
a more blended approach was used for the forecast this morning to
product a more consolidated solution.

Aviation
Panc... Gusty southeast winds will diminish slightly this morning
across the airport complex, then begin to pick back up in the
afternoon and evening hours.VFR conditions are expected today,
except for a slight chance of some MVFR conditions in showers this
afternoon and evening.

Short term forecast southcentral alaska (days 1 and 2)
Everything looks on track for heavy showers to develop across
portions of southcentral today as a sharp trough approaches and
the atmosphere quickly destabilizes due to impressive cooling
temperatures aloft. The most likely areas for convective bands
to set up include along the west side of the kenai and chugach
mountains, as synoptic low level southwest flow coming up cook
inlet converges with shallow southeast flow crossing the mountains.

Further north, heavier bands could set up just about anywhere
across the susitna valley and copper river basin. Maintained the
slight chance of thunderstorms over all of the mentioned areas
due to the steep mid-level lapse rates, dynamic lift, and upslope
along the mountains.

Meanwhile, as colder low level air moves in snow levels will
continue to fall. Generally expect snow levels to fall to 2000
feet or so this afternoon, though the heavier precip could drag
these locally lower. Issued a special weather statement to
highlight both the heavy showers and potential for snow. Showers
will taper off from south to north tonight as the trough exits to
the north. For areas where showers linger, such as up along the
alaska range, there could be some light snow accumulation as
temperatures and snow levels continue to drop. The presence of
some wind will keep temps above freezing for most of the valleys
across the region. However, for wind sheltered areas temperatures
could bottom out near freezing.

A weaker short-wave trough moving up from the south on Friday
combined with continued instability with the cold air aloft will
keep some showers in the forecast for Friday. A low pressure
system tracking south of the alaska peninsula and kodiak island
will then spread steady rain across kodiak island and the gulf
Friday night and Saturday. With flow shifting to southeast the
bulk of rain will hang up along the coast, with drier conditions
over inland areas of southcentral.

Short term forecast southwest alaska (days 1 and 2)
The cold upper level trough swinging onshore this morning will
track from the kuskokwim delta coast, inland across the kuskokwim
valley this afternoon. Instability associated with this trough
will bring isolated to scattered thunderstorms this afternoon and
evening. With very low snow levels, small hail is likely out of
the thunderstorms as well as from some of the stronger showers.

Snow will also mix in with the showers at times this morning and
again tonight.

Although a broad upper level trough will remain over the area,
showers will diminish to a more scattered coverage late tonight
through Friday. A surface low south of the alaska peninsula and
accompanying trough will increase shower coverage along the alaska
peninsula and around the greater bristol bay area a bit more
Friday afternoon and evening. Easterly flow will increase through
the weekend as an upper level low moves into the southwestern
gulf. In addition to bring increasing easterly gap downslope winds
to the lee west side of the alaska and aleutian range, easterly
waves rotating around low will bring chances for rain at times
through the weekend.

Short term forecast bering sea aleutians (days 1 and 2)
Zonal flow will continue across the bering and aleutians with the
next frontal system tracking quickly to the east along the
aleutian chain today. The surface low will arrive in the eastern
aleutians this evening and then continue east to be south of the
alaska peninsula Friday. The low will then sink slowly to the
south Friday night and Saturday before lifting back north to the
southwest gulf on Sunday. Another frontal system will push into
the western aleutians late Friday night and Saturday morning and
continue east to the central aleutians Saturday night before
weakening and dropping south Sunday.

Long term forecast (days 3 through 7)
The weekend will begin with the elongated cold upper level trough
over western and southwest mainland alaska. This will keep below
normal temperatures over most of the forecast area... Especially in
southwest mainland ak. Southcentral will be in due south flow
aloft which is favorable for precipitation. As the weekend
progresses a cut off low should develop near kodiak off the main
upper level low allowing the main low to retreat into the arctic.

After this the main pattern remains a bit unclear as models
continue to struggle with the synoptic pattern. Overall the
deterministic runs are all over the place with the GFS ensemble
means a little bit better. Best bet is that early next week
remains cloudy with some showers, but temperatures should be
increasing and back to near normal for much of the week. This
unsettled pattern is producing below normal confidence in the long
range forecasts.

Afc watches warnings advisories
Public... None.

Marine... None.

Fire weather... None.

Synopsis and model discussion... Tp
southcentral alaska... Seb
southwest alaska bering sea aleutians... Jr
long term... Kh


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ADKA2 - 9461380 - Adak Island, AK 70 mi40 min WSW 20 G 27 42°F 41°F1018.1 hPa

Wind History for Adak Island, AK
(wind in knots)    EDIT      (on/off)   Help
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G11
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Adak Island, Adak Airport, AK71 mi14 minWSW 23 G 303.00 miOvercast and Windy41°F33°F76%1018.6 hPa

Wind History from ADK (wind in knots)
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1 day agoW7SW13W10SW20
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2 days agoSW31
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Tide / Current Tables for Atka Pass, east end, Atka Island, Alaska
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Atka Pass
Click for Map
Thu -- 02:04 AM HDT     4.92 feet High Tide
Thu -- 06:33 AM HDT     Sunrise
Thu -- 07:10 AM HDT     Moonrise
Thu -- 09:40 AM HDT     -0.93 feet Low Tide
Thu -- 10:46 AM HDT     New Moon
Thu -- 10:43 PM HDT     Sunset
Thu -- 10:45 PM HDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.54.84.94.84.23.220.8-0.2-0.8-0.9-0.6-0.10.61.42.12.73.23.53.63.73.944.3

Tide / Current Tables for Bechevin Bay, Atka Island, Alaska
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Bechevin Bay
Click for Map
Thu -- 03:22 AM HDT     3.77 feet High Tide
Thu -- 06:32 AM HDT     Sunrise
Thu -- 07:09 AM HDT     Moonrise
Thu -- 10:46 AM HDT     New Moon
Thu -- 11:54 AM HDT     -0.71 feet Low Tide
Thu -- 10:43 PM HDT     Sunset
Thu -- 10:44 PM HDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.13.33.63.83.73.42.92.21.40.5-0.1-0.6-0.7-0.5-0.10.41.11.72.12.52.72.82.93

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.