Thursday, April9, 2020
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Marine Weather and Tides
Attu Station, AK

Version 3.4
NOTICE
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 6:09AMSunset 6:34PM Friday April 10, 2020 9:28 AM ChST (23:28 UTC) Moonrise 9:07PMMoonset 5:56AM Illumination 96% Phase: Waning Gibbous; Moon at 17 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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PKZ176 SEguam Island To Adak Pacific Side- 333 Am Akdt Thu Apr 9 2020
.gale warning today...
Today..S wind increasing to 35 kt. Seas 13 ft.
Tonight..S wind 25 kt. Seas 13 ft.
Fri..S wind 15 kt. Seas 9 ft.
Fri night..Variable wind 10 kt. Seas 8 ft.
Sat..SW wind 20 kt. Seas 7 ft.
Sun..E wind 25 kt. Seas 12 ft.
Mon..E wind 20 kt. Seas 13 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 091721 AAA AFDAFC

Southcentral and Southwest Alaska Forecast Discussion . UPDATED National Weather Service Anchorage AK 921 AM AKDT Thu Apr 9 2020

Updated short term discussion for the Bering Sea/Aleutians

ANALYSIS AND UPPER LEVELS.

Southcentral Alaska is seeing a relatively quiet weather pattern this morning as high pressure tries to build in from the eastern Aleutians to the southern Mainland. The clear conditions overnight have allowed temperatures across the region to drop much colder than the previous night, with many areas seeing temperatures in the single digits to mid-teens. For Southwest Alaska, a front is beginning to move inland over the Kuskokwim Delta, keeping most of the snow showers along coastal locations and as far inland as Bethel this morning. Active weather remains over the western and central Aleutians and Bering as a front progresses eastward today associated with a vertically- stacked low south of Shemya.

MODEL DISCUSSION.

Models remain in very good agreement in the short term forecast as a ridge of high pressure begins to move in over southern mainland. Forecast confidence remains above average with the major synoptic features, including a low in the western Bering heading into the weekend.

AVIATION.

PANC . VFR conditions and light winds will prevail through the forecast period.

.SHORT TERM FORECAST SOUTHCENTRAL ALASKA (Days 1 through 3/Today through Saturday night) .

High pressure will build over Southcentral today through tonight, then remain in place through Saturday. This will lead to dry conditions with mostly clear skies. Localized gap winds will persist today along the north Gulf coast and Prince William Sound, as pressure gradients remain tight behind the low, which crossed the Gulf on Wednesday with the high building in. These winds will die down tonight into Friday morning as the high moves overhead. With the clear skies, expect big swings in temperature with effective radiational cooling at night and effective heating from the sun during the day. Temperatures will warm a bit each day, likely reaching mid to upper 40s across most inland locations on Saturday.

As the upper ridge moves overhead, deep southerly flow on the leading edge of a high amplitude trough upstream will begin to transport warm and moist air up from the Pacific. A series of short-waves and surface lows will track from the Pacific up to the eastern Bering Sea beginning Friday. This will push a front into the southwest Gulf and Kodiak Island Friday night into Saturday, with precipitation slowly spreading northward. While there could be a brief period of snow when precipitation first arrives, expect primarily rain for Kodiak with the arrival of much warmer air. As systems continue to move up from the Pacific Saturday and Saturday night, expect precipitation to spread northward toward Southcentral. At this point, confidence is low in the track and timing of individual systems, so the day of arrival of precipitation is uncertain. Whenever precipitation does arrive, it looks like temperatures will warm up enough to produce a combination of rain and snow across the region.

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

A warm front is currently lifting northward across the region, bringing light snow to the Kuskokwim Delta. No significant accumulations are expected. Snow will taper off this morning, with skies clearing from south to north overnight into Friday. As such, above-average temperatures are likely, with highs in the low 40s in the Dillingham/King Salmon areas. Clouds will again increase overnight Friday into Saturday as another warm front approaches from the North Pacific. There remains significant uncertainty regarding the exact placement and type of the associated precipitation, however a brief period of snow in the morning, followed by afternoon rain showers (particularly to the south), then changing back to snow overnight Saturday into Sunday appears to be the general idea at this time.

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

A North Pacific front spreads rain across the western and central Aleutians through this evening, with low pressure lifting north across the western Bering tonight.High pressure will persist over the eastern Aleutians through Friday afternoon. Rain concentrates over the central Bering/Aleutians on Friday along a weak deformation zone between the western Bering low and a ridge across the Gulf of Alaska. The next North Pacific low moves a front up to the Alaska Peninsula Friday morning, spreading rain and gusty easterly winds along the boundary. This front pushes across to the eastern Bering late Friday afternoon.

MARINE (Days 3 through 5/Saturday through Monday).

Bering Sea/Aleutians: The theme for this extended forecast will be warmer and wetter air masses as a period of southerly flow begins thanks to a broad area of high pressure over the Gulf of Alaska/Mainland Alaska. As a frontal boundary lifts north out of the north Bering on Saturday, high pressure over the eastern half of the Bering begins to break down as a 1007 mb low in the north Pacific pushes a warm front north into the eastern two thirds of the Aleutian Chain on Saturday morning. This wave will push north of the Pribilofs Saturday afternoon and keep western Alaska, Bristol Bay, and the Alaska Peninsula in a wetter pattern through Monday morning. Another warm front lifts into the Western Aleutians Sunday afternoon, with its 995 mb parent low in the north Pacific set to cross the chain late Monday night.

Gulf of Alaska: The forecast period will start with dominant high pressure pushing off to the northeast Saturday and a warm front lifting across Kodiak Island Saturday afternoon as a north Pacific low pushes into the Aleutians. This frontal boundary will maintain a presence across the north Gulf Coast through Sunday night and then fade Monday morning as high pressure builds back in from the east.

LONG TERM FORECAST (Days 4 through 7/Sunday through Wednesday).

Model guidance has come into much better agreement for the Sunday through Tuesday time period showing an upper level ridge in place across much of Alaska with confidence very high. With this upper level ridge in place, the warming trend will continue every day into the middle of next week. For the mainland, expect temperatures warming to near normal on Sunday and then to above normal early next week. Unsettled conditions are also possible on Sunday as a weak system from the North Pacific south of Dutch Harbor moves northward toward Bristol Bay with high confidence for this system. A different closed off system west of the Aleutians Sunday will move east towards the Bering Monday due to the upper level trough in place over eastern Russia and the North Pacific. This may bring another period of unsettled weather to Southwest and Southcentral Alaska Tuesday to Wednesday time frame next week as it continues east but gets pushed north due to the blocking ridge to the east. Confidence is average for this system.

AFC WATCHES/WARNINGS/ADVISORIES. PUBLIC . NONE. MARINE . Gales 175 176. FIRE WEATHER . NONE.



SYNOPSIS AND MODEL DISCUSSION . ALH SOUTHCENTRAL ALASKA . SEB SOUTHWEST ALASKA/BERING SEA/ALEUTIANS . AP MARINE/LONG TERM . LB/MV


Weather Reporting Stations
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Airport Reports
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Tide / Current Tables for Massacre Bay, Attu Island, Alaska
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Massacre Bay
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Thu -- 01:10 AM HDT     1.37 feet Low Tide
Thu -- 06:44 AM HDT     2.82 feet High Tide
Thu -- 08:40 AM HDT     Sunrise
Thu -- 09:55 AM HDT     Moonset
Thu -- 01:56 PM HDT     -0.55 feet Low Tide
Thu -- 09:09 PM HDT     2.70 feet High Tide
Thu -- 10:17 PM HDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.41.41.72.12.52.82.82.62.11.50.70-0.4-0.6-0.40.10.81.52.12.52.72.62.4

Tide / Current Tables for Chichagof Harbor, Attu Island, Alaska
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Chichagof Harbor
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Thu -- 01:26 AM HDT     1.49 feet Low Tide
Thu -- 06:57 AM HDT     3.08 feet High Tide
Thu -- 08:40 AM HDT     Sunrise
Thu -- 09:54 AM HDT     Moonset
Thu -- 02:12 PM HDT     -0.60 feet Low Tide
Thu -- 09:22 PM HDT     2.95 feet High Tide
Thu -- 10:17 PM HDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.51.51.82.22.62.93.12.92.51.810.2-0.3-0.6-0.5-00.71.42.22.72.92.92.7

Weather Map
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GEOS Local Image of Puerto Rico    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.
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Wind Forecast for (19,4,5,8)
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Ground Weather Radar Station Anderson AFB, Guam
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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.