Thursday, January21, 2021
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Marine Weather and Tides
Attu Station, AK

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:46AMSunset 6:17PM Friday January 22, 2021 2:01 PM ChST (04:01 UTC) Moonrise 11:00AMMoonset 12:56AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 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- 353 Pm Akst Thu Jan 21 2021
.small craft advisory through Friday night...
Tonight..N wind 15 kt. Seas 10 ft.
Fri..W wind 20 kt. Seas 9 ft.
Fri night..S wind 25 kt. Seas 9 ft.
Sat..SE wind 30 kt. Seas 12 ft.
Sat night..SE wind 30 kt. Seas 18 ft.
Sun..W wind 30 kt. Seas 21 ft.
Mon..SW wind 25 kt. Seas 19 ft.
Tue..W wind 30 kt. Seas 35 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 220201 AFDAFC

Southcentral and Southwest Alaska Forecast Discussion National Weather Service Anchorage AK 501 PM AKST Thu Jan 21 2021

ANALYSIS AND UPPER LEVELS. Previous analysis is on track with the break in the active weather continuing across most of the eastern interior as a strong ridge extending from the Gulf to the Beaufort Sea builds over most of mainland Alaska. Light winds and clear to partly cloudy conditions are in place across most of the eastern interior. Clouds have spread over most of Southcentral, with scattered showers (snow showers at higher elevations) spreading north across favored areas along the Kenai Peninsula and Valdez Arm. A weak occluded front is working its way slowly eastward across the western Gulf and Alaska Range in association with the large, vertically stacked low over the northern Bering.

Out west, the aforementioned low continues to race north and is now northwest of St. Lawrence Island. Very warm temperatures in the mid to upper 30s have flooded into the Y-K delta and across the northern AKPEN to the Kuskokwim Mountains in the wake of the now occluded front spiraling out from the storm's center. Gusty south to southeast winds are continuing across much of the region with up to gale force winds persisting over parts of the northern and eastern Bering Sea. The outer reaches of what will be the next impactful system in the coming days are now encroaching on the Western Aleutians, but the bulk of the storm remains over open waters of the North Pacific for the time being.

MODEL DISCUSSION. Models are in fairly good synoptic agreement into the weekend. The ridge currently over eastern Alaska will continue to build, thereby forcing all activity north across the Bering and western Alaska. Waves of energy will get thrown eastward into Southcentral, bringing periodic chances for precip, but each one will generally lose energy as it moves east.

AVIATION. PANC . VFR conditions will persist, along with LLWS with light north winds at the surface and SE winds around 25kts at around 1000ft-1500ft. Winds aloft will likely increase to around 30kts overnight.

SHORT TERM FORECAST SOUTHCENTRAL ALASKA (Days 1 and 2).

A weakening weather front is moving through Southcentral Alaska overnight. This is mainly bringing some rain to coastal locations. There are some reflectivity levels of up to 25 dbz on the Kenai radar over the western Kenai Peninsula and upper Cook Inlet this afternoon. It looks like most of this is virga as the lower levels of the atmosphere are quite dry (up to about 700 mb on the Anchorage afternoon sounding). However, since there are some reflectivities, some precipitation could reach the ground through the overnight, but limited to no accumulation is expected.

Friday will see a break in between systems and then another front and upper level wave move through Southcentral from the southwest. This one has a better chance to bring snow to the Cook Inlet through Susitna Valley regions (including Anchorage and the Matanuska Valley) on Saturday after the surface front moves through, and in advance of the upper level wave.

SHORT TERM FORECAST SOUTHWEST ALASKA (Days 1 through 3).

An area of low pressure has formed over the Alaska Peninsula and is quickly lifting northward. This is pushing a frontal boundary inland over Southwest, spreading in warmer southerly flow and rain. As this system departs to the north overnight, precipitation will briefly taper before another front arrives Friday. A broad upper level low will lift over the central Bering Friday and will continue to bring warm southerly flow to the Alaska Peninsula and Southwest. Precipitation is expected to fall as rain, as plenty of warm air will be in place across the area. However as this low gradually lifts into the northern Bering by Friday night, colder air on the backside of the system may allow for a change to a rain/snow mix by Saturday morning. However by this time, the bulk of the precipitation will have already moved through and only residual showers would remain. Onshore, westerly flow will continue along the coast through Saturday. A pattern change will begin to take place Saturday into Sunday as a colder airmass arrives from the north.

SHORT TERM FORECAST BERING SEA/ALEUTIANS (Days 1 through 3).

A broad upper level low is in place over the central Bering. At the surface, a complex low with several smaller meso-lows embedded around the main center are bringing chaotic conditions to the central Aleutians. Over the east Bering, warm southerly flow continues, with gale force winds in place for the eastern Bering waters through Friday. Meanwhile, colder northerly flow is spreading in over the western Bering. As this complex low lifts northward Friday, showers are expected to continue across much of the Aleutian Chain. Gale force westerlies can be expected across North Pacific waters south of the Aleutian Chain through much of Friday. Another developing low arrives over the western Aleutians Saturday and the leading front will spread across the western and central Aleutians. With ample cold air wrapping around the backside of this low, snow showers are expected across the Bering Sunday as the low gradually tracks eastward.

MARINE (Days 3 through 5): Sunday through Tuesday.

Gulf of Alaska: Forecast confidence is good into the weekend. A low moves across the Gulf through Tue. Widespread westerly gale force winds and waves over the Gulf diminish Mon. A second low moves across the Southern Gulf Mon to Tue. Areas of southeasterly small craft with areas of gale force winds move over the Southern Gulf through Tue. Wave heights to 20 feet over the Southern Gulf Sun and subsiding Mon.

Aleutians/Bering: Forecast confidence is good into the weekend. A well-developed low enters the Western Aleutians and Bering and moves along a front into the Northern Bering by Tue. Widespread small craft winds and waves with local areas of gale force winds cross the Aleutians and diminish Sun. Widespread small craft winds persist across the Southern Bering through Tue. Wave heights to 26 feet Pacific side and 18 feet Bering side along the Western and Central Aleutians are expected for Sun and Mon, subsiding Tue. An approaching system brings waves to 20 feet to the Western Aleutians Tue.

LONG TERM FORECAST (Days 4 through 7): Monday through Thursday.

Broad upper-level troughing and a closed low over the Bering Sea push towards the AKPEN/Southwest Coast, forcing out the upper- level ridging extending from the Gulf to the Interior. High winds and waves are likely across the Bering and Aleutian Chain starting early next week, spreading to the Southwest Coast and AKPEN by Tuesday as its front pushes onshore. Active weather continues through mid-week as a second system approaches the Western Bering. The associated front moves across the Aleutians, resulting in showery conditions and another round of high winds and waves. Model spread is still relatively large, thus, there is moderate uncertainty on the exact track of this system. However, models are favoring a more eastward push towards the Western Gulf. Should this solution pan out, showery conditions may become likely along the Southcentral Coast, as well as stormy weather across the Gulf of Alaska.

AFC WATCHES/WARNINGS/ADVISORIES. PUBLIC . NONE. MARINE . Gale Warning . 155 165 170-176 180 130 131 138. FIRE WEATHER . NONE.



SYNOPSIS AND MODEL DISCUSSION . NR SOUTHCENTRAL ALASKA . EZ SOUTHWEST ALASKA/BERING SEA/ALEUTIANS . KO MARINE/LONG TERM . KZ/KM


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for PASY

Wind History from ASY (wind in knots)
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1 day agoSW12SW20
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2 days agoSE38
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Tide / Current Tables for
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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.

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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 numerous 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.