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Marine Weather and Tides
Unalaska, 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 4:31AMSunset 11:22PM Sunday May 31, 2020 9:40 PM AKDT (05:40 UTC) Moonrise 1:45PMMoonset 2:01AM Illumination 76% Phase: Waxing Gibbous; Moon at 10 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- 321 Pm Akdt Sun May 31 2020
Tonight..NE wind 20 kt. Seas 6 ft. Widespread rain showers.
Mon..NE wind 20 kt. Seas 5 ft. Rain.
Mon night..NW wind 10 kt. Seas 3 ft.
Tue..NW wind 15 kt. Seas 3 ft.
Tue night..NW wind 10 kt. Seas 3 ft.
Wed..W wind 15 kt. Seas 2 ft.
Thu through Fri..W wind 10 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 010020 AFDAFC

Southcentral and Southwest Alaska Forecast Discussion National Weather Service Anchorage AK 420 PM AKDT Sun May 31 2020

ANALYSIS AND UPPER LEVELS. The weather pattern is currently dominated by a persistent upper level ridge stretching across the west coast of the North America into the north half of the state and a long wave trough draped from western Alaska across the Bering Sea. Embedded within this trough are two distinct upper level lows, one over the eastern Gulf and a second just south of the eastern Aleutian Chain. The first system is vertically stacked and and will further weaken into an open wave as it drifts eastward toward the Alaska Panhandle. Easterly flow aloft between the upper level and the ridge to the north is ushering another easterly shortwave across Southcentral this afternoon. Satellite imagery is showing a mass of low and mid level clouds cover moving west from the Yukon and Copper River Basin over the Susitna Valley and Cook Inlet. Rainfall is also spreading west from the Copper River Basin to Price William Sound. Cumulus clouds are popping up over areas of the Alaska Range and Kuskokwim Valley were stronger isolation is increasing atmospheric instability.

The second upper level low is associated with a surface low just south of Dutch Harbor. This feature currently in the mature phase and will begin occluding as the upper level low catches up to the surface low and becomes vertically stacked. A occluded front attached to the surface low is stretched over the western extent of the AKPEN, producing rain and gusty southeasterly winds.

Extensive cloud cover and gusty northwesterly winds continue over the western Bering and Aleutians as a shortwave trough slides south over the region. Meanwhile, subsidence underneath a ridge over the eastern Bering is keeping clouds at bay from Saint Paul to Cape Newenham.

MODEL DISCUSSION. Models continue to come into better agreement through the short term and are clustered well with regard to the position and strength of a surface low south of Dutch Harbor. Guidance is also in good agreement with the vertically stacked low in the eastern Gulf and it transitions to an open wave and moves to the coast overnight. Model spread increases late Mon into Tuesday with the progression of the main surface low as it tracks south of the AKPEN. The EC continues to be the most progressive, positioning it south of Sitkinak Island by Tuesday morning while the NAM, GFS, and Canadian keep the center of circulation closer to the Shumagin Islands. Likewise, there is also some model spread with the development of a triple point low along the occluded front as it moves into the Gulf. Again, the EC is more progressive lifting this developing feature farther north toward the eastern Kenai Peninsula coast more quickly than other guidance. Hence, a blend of NAM and GFS was favored for the evolution of this system as it tracks east.

AVIATION. PANC . VFR conditions will persist. Gusty southerly winds are expected to continue through late evening, then diminish. These winds will then re-develop Monday afternoon.

SHORT TERM FORECAST SOUTHCENTRAL ALASKA (Days 1 and 2). A broad upper level trough in place over the northern Gulf will allow for the continuation of an easterly wave pattern across Southcentral and thus showery conditions across the area for the beginning of the week. A few thunderstorms have developed this afternoon in the northwestern Copper River Basin near the Denali Highway. These will likely continue through the evening hours before dissipating. Gusty southeasterly winds will increase this evening, thanks to a strengthening coastal ridge along the Gulf and a thermal trough inland. Southeasterly winds will be noticeably stronger this evening through Turnagain Arm, the Knik River Valley, and the Copper River Basin. There will likely be a brief lull before a second round of gusty southeasterly flow arrives Monday afternoon as a front lifts inland along the Gulf coast. This front will also bring overcast skies and rain on Tuesday, especially for areas along the northern Gulf coast.

SHORT TERM FORECAST SOUTHWEST ALASKA (Days 1 through 3). Widely scattered thunderstorm activity is ongoing across the Kuskokwim Delta this afternoon. This activity formed in response to the combination of an upper level wave, low level moisture, and just enough sunshine earlier today to allow the instability to be realized. Easterly upper level steering flow will keep the showers and thunderstorms that form moving towards the coast. The thunderstorm activity will diminish with the loss of daytime heating tonight. Lingering moisture, especially in the areas hit with the thunderstorm rains will promote fog potential again tonight around Bethel.

A more stable air mass following behind the ongoing shower and thunderstorm activity will move in across all of Southwest Alaska on Monday. This will greatly diminish the thunderstorm threat, though an isolated evening storm or two may develop along the Nushagak Hills.

On Tuesday, another upper level wave will approach the area from the southeast. The latest thinking is the strongest forcing from the wave would move through Tuesday night, and impacts at the ground will be minimal. Nevertheless, the combination of additional large-scale lifting ahead of the wave and the persistent thermal trough over interior Alaska may be enough to set off another round of thunderstorms, in many of the same areas seeing the storms this evening.

Outside of any lightning starts, fire weather concerns remain minimal with plentiful low level moisture and seasonable temperatures persisting. Gap winds may be an issue around Lake Iliamna and the other usual gaps in the Aleutian Mountains from this evening into Monday, but their ability to dry the atmosphere will be limited.

SHORT TERM FORECAST BERING SEA/ALEUTIANS (Days 1 through 3). A slow-moving vertically-stacked low centered on the Pacific side of Unalaska Island will only very slowly drift eastward, only reaching the marine area south of Kodiak Island Tuesday night. Continued unsettled weather associated with the low will therefore persist across the Eastern Aleutians and the Alaska Peninsula through Tuesday, with gradually improving conditions following behind it from west to east. Elsewhere, a large area of high pressure over the North Pacific south of the Western Aleutians will keep conditions quiet across the rest of the Bering straight through Wednesday. Any unsettled weather would be along the coast of Southwest Alaska from any storms that move over the area.

MARINE (Days 3-5: Wednesday through Friday). Gulf Of Alaska: A rapidly dissipating low is expected to move into the southwest Gulf on Wednesday. Guidance differs on the exact location of the low, but confidence is high that winds should remain below small craft advisory criteria. High pressure will take over as the low moves into the north Pacific on Friday.

Bering: High pressure to the south of the Aleutian Chain will bring weak, easterly winds to much of the Bering through Friday. A frontal system to the east of the Kamchatka should bring precipitation and increasing cloud cover to the western Bering on Thursday, reaching the eastern Bering on Friday.

LONG TERM FORECAST (Days 3-7: Wednesday through Sunday). A broad longwave trough will persist over much of the state with a closed upper level ridge slowly making its way east across the northern slope. Two upper level shortwaves embedded within the trough will be the primary weather makers throughout the week. The first of which is the vertically stacked shortwave just to the south of the Akpen on Wednesday. This system should move into the southwest Gulf on Thursday and continue on its southeasterly trajectory into North Pacific by Friday. Models remain in disagreement in regards to the propagation direction of the low. The ECMWF moves the system east into the central Gulf before it makes its turn to the southeast, and the GFS/Canadian solution moving the low on a southeast trajectory straight into north Pacific. Differences between the two solutions should be monitored as the more southerly wind component on the ECMWF solution will bring more moisture and precipitation to the southern mainland, while the easterly component of the GFS solution will confine precipitation to the coastline. Meanwhile, a series of weak easterly waves and diurnal heating over the southern mainland should provide moderate chances for scattered afternoon showers through the forecast period.

In the wake of the first system a period of brief ridging is expected over the Bering and southwest Alaska. This should help to keep the area on the clear side before the next upper level shortwave arrives in the northern Bering from the Kamchatka Peninsula Thursday morning. Although this system is well resolved in the upper levels, it appears that it fails to break down high pressure in the lower levels, resulting in only light winds and precipitation over the Bering and southwest Alaska. The system appears to then stall out off of the Y-K Delta on Friday, which should help to bring consistent cloud cover and showery activity to the area through Sunday.

AFC WATCHES/WARNINGS/ADVISORIES. PUBLIC . NONE. MARINE . NONE. FIRE WEATHER . NONE.



SYNOPSIS AND MODEL DISCUSSION . TM SOUTHCENTRAL ALASKA . KO SOUTHWEST ALASKA/BERING SEA/ALEUTIANS . JW MARINE/LONG TERM . CJ


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
UNLA2 - 9462620- Unalaska, AK 1 mi59 min E 18 G 24 46°F 44°F981.4 hPa

Wind History for Unalaska, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Unalaska, Unalaska Airport, AK1 mi45 minE 1910.00 miOvercast and Breezy46°F39°F79%981.4 hPa

Link to 5 minute data for PADU

Wind History from ADU (wind in knots)
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Tide / Current Tables for Dutch Harbor, Alaska (expired 1988-12-31)
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Dutch Harbor
Click for Map
Mon -- 02:19 AM AKDT     3.93 feet High Tide
Mon -- 05:17 AM AKDT     Moonset
Mon -- 06:40 AM AKDT     Sunrise
Mon -- 09:13 AM AKDT     0.72 feet Low Tide
Mon -- 03:12 PM AKDT     2.65 feet High Tide
Mon -- 06:11 PM AKDT     Moonrise
Mon -- 08:16 PM AKDT     1.45 feet Low Tide
Mon -- 11:28 PM AKDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.13.63.93.93.52.82.11.40.90.70.81.11.62.12.52.62.62.321.61.51.51.82.4

Tide / Current Tables for Kisselen Bay, Beaver Inlet, Unalaska Island, Alaska
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Kisselen Bay
Click for Map
Mon -- 05:17 AM AKDT     Moonset
Mon -- 06:03 AM AKDT     0.75 feet Low Tide
Mon -- 06:41 AM AKDT     Sunrise
Mon -- 12:13 PM AKDT     3.50 feet High Tide
Mon -- 05:07 PM AKDT     1.35 feet Low Tide
Mon -- 06:11 PM AKDT     Moonrise
Mon -- 11:27 PM AKDT     Sunset
Mon -- 11:50 PM AKDT     5.34 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.14.53.72.61.710.80.91.42.12.73.33.53.42.92.21.61.41.522.83.74.65.2

Weather Map
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wmap_P
GEOS Local Image of Alaska    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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Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Bethel, AK
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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.