Thursday, April25, 2019 L-36.com


Marine Weather and Tides
Attu Station, AK

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:00AMSunset 6:36PM Friday April 26, 2019 12:49 PM ChST (02:49 UTC) Moonrise 12:50AMMoonset 8:50AM Illumination 59% Phase: Waning Gibbous; Moon at 21 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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PKZ178 Kiska To Attu- 302 Pm Akdt Thu Apr 25 2019
.gale warning through Friday...
Tonight..S wind 40 kt. Seas 14 ft. Rain.
Fri..S wind 35 kt. Seas 14 ft. Rain.
Fri night..S wind 30 kt. Seas 12 ft. Rain.
Sat..S wind 40 kt. Seas 16 ft.
Sat night..W wind 30 kt. Seas 16 ft.
Sun..S wind 25 kt. Seas 11 ft.
Mon through Tue..SW wind 25 kt. Seas 15 ft.


7 Day Forecast for Marine Location Near Attu Station, AK
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location: 52.84, 173.2     debug


Area Discussion for -
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Fxak68 pafc 260020
afdafc
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
420 pm akdt Thu apr 25 2019

Analysis and upper levels
An area of low pressure continues to weaken over the gulf of
alaska. The associated occluded front extends over the north gulf
coast bringing showers to the prince william sound area. Colder
air on the backside of the low and offshore flow have allowed for
continued clear conditions over southwest alaska. Further west, a
ridge of high pressure is centered over the bering with plenty of
low level marine stratus in place throughout most of the bering in
response to the subsidence from the high. Meanwhile, a warm front
associated with a kamchatka low has begun to approach the western
aleutians.

Model discussion
Models remain in generally good agreement with the departure of
the gulf low toward the southeast by Fri evening. Models continue
to struggle with the exact location and strength of a complex
north pacific low moving into the southwestern gulf by Sunday
afternoon.

Aviation
Panc...VFR conditions and light winds will persist.

Short term forecast southcentral alaska (days 1 and 2)
A low in the gulf of alaska this afternoon will begin to pull away
from the area to the southeast overnight. This will allow high
pressure to build into southcentral alaska tomorrow and the high
pressure should persist through the weekend. This will bring in
clearer skies, warmer temperatures and some gusty northerly winds
mainly through channeled terrain.

Short term forecast southwest alaska (days 1 through 3)
A return of spring weather is expected for the early part of the
weekend with sunny skies and cool nights. By Sunday, a low
approaching from the south will bring a chance of showers to the
bristol bay area, but with warming temperatures aloft these are
expected to fall as rain.

Short term forecast bering sea aleutians (days 1 through 3)
High pressure continues to reign over the eastern bering, with
some lingering marine stratus, but wind and seas will be fairly
quiet through Sunday. Further west, a front approaches the western
aleutians, bringing gale force winds and rain. This front is
expected to progress gradually eastward through the weekend. By
Sunday, the gale force winds and higher seas will have spread
across the central bering. With southerly flow, temperatures are
expected to bring mostly rain with this front. South of the
aleutians, another low will skirt along the eastern aleutians
beginning tonight, then progressing eastward through Sunday. Rain
isn't expected to affect the southern side of the chain until
Friday afternoon, then moving to the south side of the alaska
peninsula for Saturday and Sunday.

Marine (days 3 through 5)
Beginning the extended marine period, the general storm track
will be over the western bering sea. This means gale force winds
will be relegated to west of the pribilof islands with general
e-se winds over the remainder of the bering sea and gulf of alaska
as weakening fronts lift north through Monday evening.

Thereafter, high pressure is going to assert its dominance over
the region with no major storms and weakening winds lowering seas
across the bering sea and gulf of ak Tue night through wed... And
possibly through the end of the week. Forecast confidence is
rather high given the fact the storm track will shift south under
the influence of overall high pressure.

Long term forecast (days Sunday evening through Thursday morning)
Upper levels: Sunday evening starts out with some model
differences with the canadian nh ECMWF going with a rex block(low
north gulf kodiak with ridge interior). On the other hand, the gfs
tends toward a high amplitude ridge over the eastern gulf,
troughing over western alaska ak pen, and a broad long wave over
the western bering. The can nh and ECMWF rex block transitions
toward a high amplitude ridge over the gulf eastern mainland with
a long wave trough generally over the bering sea aleutians on
Monday night. This general pattern looks like it should hold into
Thursday morning.

Surface: although models start out somewhat differently aloft the
surface patterns appear to be in somewhat fair agreement with a
moderately strong low entering the western bering sea and a north
moving front approaching the western gulf ak pen Sunday evening.

The mean upper pattern will support keeping the storm track
generally over the bering sea aleutians with relatively dry
conditions over the eastern mainland eastern gulf. Elsewhere, the
eastern positioning of the upper ridge will allow bouts of
moisture to impact much of southwest alaska through Thursday. How
much moisture gets into southcentral and the western gulf after
the front pushes north Sunday night and Monday is in question.

Expect for now at least clouds and chance pops for the western
gulf and southcentral through mid week. Precipitation will lean
toward rain over the gulf ak pen with a mix over southwest
alaska bering sea.

Afc watches warnings advisories
Public... None.

Marine... Gale warning 172 178.

Fire weather... None.

Synopsis and model discussion... Ko
southcentral alaska... Ez
southwest alaska bering sea aleutians... Lf
marine long term... Ja rc


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Shemya, Eareckson AFB, AK49 mi1.9 hrsS 23 G 307.00 miOvercast and Windy38°F32°F79%1020.1 hPa

Wind History from ASY (wind in knots)
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Last 24hrE14E14E12SE14E13SE12SE12SE15SE14SE12SE14SE15SE18S19
G24
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SE17S17SE20
G27
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G35
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1 day agoSE7E8E10E8SE10SE14E14SE16E12E16E16E16E16E16E17E19E20
G24
E19E18E14E17E13--E16
2 days agoNW13NW13NW11NW11NW8NW7NW8NW6NW6N5NW8NW3NW4N4NW6N4CalmW4N9CalmE6SE9E5SE6

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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wmap_A
GOES Local Image of    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.

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (22,6,7,8)
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Ground Weather Radar Station Anderson AFB, Guam
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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.