Wednesday, October20, 2021
Privacy Policy
L-36.com

Marine Weather and Tides
Whittier, AK

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 8:54AMSunset 6:33PM Wednesday October 20, 2021 5:10 AM AKDT (13:10 UTC) Moonrise 5:48PMMoonset 7:43AM Illumination 100% Phase: Full Moon; Moon at 14 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
    EDIT      (on/off)   Help
PKZ129 Passage Canal- 357 Am Akdt Wed Oct 20 2021
Today..E wind 20 kt diminishing this morning then becoming W 10 kt in the afternoon. Seas 2 ft. Rain.
Tonight..W wind 10 kt increasing to 20 kt after midnight. Seas 3 ft. Rain.
Thu..E wind 10 kt. Seas 2 ft. Rain.
Thu night..E wind 15 kt. Seas 2 ft.
Fri through Sun..E wind 10 kt. Seas 2 ft.


7 Day Forecast for Marine Location Near Whittier, AK
   Hourly   EDIT   Help
location: 60.63, -148.17     debug


Area Discussion for -
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXAK68 PAFC 201303 AFDAFC

Southcentral and Southwest Alaska Forecast Discussion National Weather Service Anchorage AK 503 AM AKDT Wed Oct 20 2021

ANALYSIS AND UPPER LEVELS.

An impressive 200 kt jet streak at 250 mb extends across the central Bering but west-southwest of Pribilof Islands. East- northeast of this feature lies an upper trough deeply anchored in the North Pacific which wraps across the Southwest Coast through a Siberian low. A strong upper high across Southcentral will condense clouds and rain especially more inland for Southcentral today. Shortwaves near the upper trough axis will bring light mixed rain/snow further inland of the lower Kuskokwim Valley and Kuskokwim Delta, and intermittent rain over Southwest Coast this morning including areas over the western Gulf and around Prince William Sound.

MODEL DISCUSSION.

Models are in accord for the next North Pacific low advancing through the Gulf today, but not so much for the second low entering the southeastern Gulf Friday morning. For the highly anticipated Northwest Pacific low arriving this afternoon near the western Aleutians, solutions are on track guiding the low toward Pribilof Islands on Thursday until GFS splits from the rest of the models Thursday afternoon. GFS will be a bit relaxed than the other models, trailing behind the rest as it crosses the Alaska Peninsula Friday afternoon. A second Northwest Pacific low could potentially reach the central Aleutians as early as Sunday morning, creating uncertainty for the Aleutians forecast and whether this next system will draw excessive tropical moisture across the Aleutian Chain and Southwest Coast. The placement of the lows and frontal axis remains a challenge including the arrival time of the aforementioned lows makes a huge difference in the forecast for the next several days. For this reason, the forecast confidence is low after Thursday afternoon.

AVIATION.

PANC . VFR conditions will continue through at least this afternoon. Cloud ceilings are expected to lower starting 03Z tonight through 18Z Thu. Also, intermittent rain and light and variable winds could continue through the forecast period.

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

Southcentral remains in an active pattern for the next few days with the upper level longwave trough southwest of the area and south to southeast flow aloft ahead of this trough. This set up is allowing numerous upper level waves to travel through the area, one of which is over the Kenai Peninsula, Anchorage and the Susitna Valley early this morning. This wave will move northwestward today with just a brief break before the next system. This next system is a low moving along the east Gulf coast which will move over Prince William Sound tonight and then rapidly dissipate at the surface. Even so, the moisture and upper level wave will move over northern Cook Inlet as well as the Chugach and Talkeetna Mountains tonight. Exactly where the low and remnants will move is still a little bit of a question. Anchorage will be near the western edge, but looks likely to get precipitation. The Precipitation type (P-type) was a big challenge for this forecast package. Temperatures are borderline for rain or snow over Anchorage with rain as the likely P-type on the western Kenai Peninsula and snow in the Susitna Valley by the time one reaches Talkeetna. The fact that is has been able to rain throughout the night tonight with temperatures well into the 40s today and warm advection with this incoming system bodes well for rain to be the dominant P-type. However, that longwave trough southwest of the region today will also be moving up Cook Inlet and over Anchorage into the Susitna Valley overnight. There is some cold air aloft associated with this trough which could also influence P-type. Therefore went with a rain-snow mix in Anchorage and Matanuska Valley with very little snow accumulation, if any, at lower elevations.

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

Broad upper level trough resides within the longwave pattern across Southwest today. Ridging over the Bering moves eastward, breaking the longwave trough pattern over Southwest Alaska by tonight. Weak onshore flow may promote the development of some areas of patchy fog along the Bristol Bay coast, including King Salmon and Dillingham, during the overnight hours tonight. A second system out of the northwest Pacific enters the western Bering tonight, whose front reaches the Southwest Coast tomorrow afternoon. Winds transition to southeasterly across the Mainland and become increasingly gusty through evening and overnight hours Thursday night, especially along the coast. The bulk of the associated precipitation mostly gets caught up along the upslope regions of the mountain ranges and along the Alaska Peninsula.

SHORT TERM FORECAST BERING SEA/ALEUTIANS (Days 1 and 2).

Strongly amplified pattern over the Bering includes a longwave trough pattern over Southwest Alaska and a building ridge in the western Bering. The gradient existing over the central Bering keeps northwesterly gale force winds in tact through the morning hours today, with winds briefly diminishing through the evening before the next system enters the western Bering. This system continues strengthening as it moves towards the central Bering where it bottoms out. This supports widespread storm force wind, with a high chance of hurricane force winds, along the back side of the low where the arctic air has been pulled southward. Additionally, gale force winds will occupy most of the rest of the Bering tomorrow through Friday afternoon, diminishing to small craft once the low crosses the Alaska Peninsula. Anticipate heavy precipitation to fall along the frontal boundary, most significantly along the Aleutian Chain and along the northern edge of the low.

MARINE (Days 3 through 5/Friday through Sunday).

Bering/Aleutians

Forecast confidence remains moderate during the 3-5 day period as a strong low pressure system moves through the central and eastern Bering Sea. Guidance shows minor differences in the placement of this low. There is better agreement on the intensity of this low which is likely to produce a very widespread area of gale force winds with an area of storm force winds southwest of the low center. This low will weaken on Saturday as it crosses into the Gulf of Alaska, though strong northwesterly gap winds are still expected along the eastern Aleutian Chain and western Alaska Peninsula. Large long period northwesterly swell will accompany these storm force winds along the north side of the eastern Aleutians Saturday morning. This swell will then gradually abate Saturday afternoon and evening.

Gulf of Alaska

Forecast confidence remains low to moderate on Friday as an area of low pressure moves northwestward along the northern Gulf. Guidance shows differences in solutions with the placement and intensity of this low. However, it is likely there will be areas of gale force winds accompanying this low along the northern Gulf on Friday. Confidence still remains low on Saturday and Sunday as guidance shows significant differences in a series of compact lows moving northwestward in the Gulf.

LONG TERM FORECAST (Days 4 through 7/Saturday through Tuesday).

A cool and wet pattern will gradually transition to cool and drier across Southcentral during the extended period. Upper level troughing will continue to extend southeastward from the northern Bering Sea into the Gulf of Alaska. The trough-axis will remain southwest of the Kenai Peninsula which will allow for southeasterly onshore flow aloft across Southcentral, thus increasing our chances of clouds and precipitation. With respect to precipitation type, the chance for snow will increase with elevation. The pattern across Southcentral then becomes drier while still remaining cool as ensemble guidance shows the surface low in the Gulf moving eastward on Monday into Tuesday. This will result in a north-northeasterly offshore flow pattern near the surface and will allow for a drier airmass to move into the region.

Southwest will be colder than Southcentral as this region will be closer to the center of the trough-axis. With respect to the chance for precipitation, Southwest will follow the similar trend as Southcentral with the airmass becoming drier later in the extended period.

The Bering/Aleutians will mainly be cloudy, cool and have widespread shower activity as broad upper-level troughing will extend across the region for the majority of the extended period. However, upper-level ridging will begin to move into the far western Bering/Aleutians on Monday and Tuesday. This will allow for an increase in temperature and a decrease in cloud cover during that timeframe. Closer to the surface, strong low pressure will move from Bristol Bay into the Gulf of Alaska Saturday morning. This will result in strong northwesterly gap winds south of the eastern Aleutian Chain. These gap winds will then ease Saturday night into Sunday. A second surface low will move along the Aleutian Chain Sunday through Tuesday and will bring widespread gale force winds and rain.

AFC WATCHES/WARNINGS/ADVISORIES. PUBLIC . NONE. MARINE . Storm-force Warning: 170, 172-176, 412-414. Gale Warning: 125, 150, 155, 160, 165, 171, 177-181, 185, 411. FIRE WEATHER . NONE.



SYNOPSIS AND MODEL DISCUSSION . CB SOUTHCENTRAL ALASKA . EZ SOUTHWEST ALASKA/BERING SEA/ALEUTIANS . KM MARINE/LONG TERM . ED


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46081 - Western Prince William Sound 13 mi81 min E 16G23 44°F 47°F1 ft991.4 hPa (+1.1)39°F
BLIA2 - Bligh Reef Light, AK 70 mi41 min NNE 13G14 44°F 992.4 hPa
SWLA2 - 9455090- Seward, AK 75 mi59 min 49°F991 hPa

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Portage, Portage Glacier, AK37 mi78 minVar 6 G 165.00 miLight Rain Fog/Mist41°F38°F89%990.9 hPa

Link to 5 minute data for PATO

Wind History from ATO (wind in knots)
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
12
am
1
am
2
am
3
am
4
am
5
am
Last 24hr3--46--E22
G45
E23
G46
SE25
G60
E24
G53
--E10
G50
E19
G45
--E20
G42
SE23
G46
E17
G39
SE20
G40
E12
G37
SE12
G29
E8
G20
E9
G23
--6
G16
--
1 day ago--3--W3--0--SE3------------0E4----0------00
2 days agoE11
G24
----------------E21
G38
E13
G36
----SE16
G33
--E13
G45
----------------

Tide / Current Tables for Applegate Island, Alaska
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Applegate Island
Click for Map
Wed -- 01:57 AM AKDT     11.83 feet High Tide
Wed -- 06:57 AM AKDT     Full Moon
Wed -- 07:53 AM AKDT     1.00 feet Low Tide
Wed -- 08:43 AM AKDT     Moonset
Wed -- 08:47 AM AKDT     Sunrise
Wed -- 01:59 PM AKDT     13.00 feet High Tide
Wed -- 06:25 PM AKDT     Sunset
Wed -- 06:46 PM AKDT     Moonrise
Wed -- 08:20 PM AKDT     -0.52 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
9.4
1
am
11.2
2
am
11.8
3
am
11.2
4
am
9.4
5
am
6.7
6
am
3.8
7
am
1.7
8
am
1
9
am
2.1
10
am
4.5
11
am
7.5
12
pm
10.3
1
pm
12.3
2
pm
13
3
pm
12.3
4
pm
10.4
5
pm
7.4
6
pm
4
7
pm
1.1
8
pm
-0.4
9
pm
-0.1
10
pm
1.8
11
pm
4.7


Tide / Current Tables for Culross Bay, Wells Passage, Alaska
   EDIT      (on/off)   Help   One Week of Data
Culross Bay
Click for Map
Wed -- 01:43 AM AKDT     12.03 feet High Tide
Wed -- 06:57 AM AKDT     Full Moon
Wed -- 07:46 AM AKDT     1.00 feet Low Tide
Wed -- 08:43 AM AKDT     Moonset
Wed -- 08:48 AM AKDT     Sunrise
Wed -- 01:45 PM AKDT     13.20 feet High Tide
Wed -- 06:25 PM AKDT     Sunset
Wed -- 06:46 PM AKDT     Moonrise
Wed -- 08:13 PM AKDT     -0.52 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
10
1
am
11.7
2
am
12
3
am
11.1
4
am
9.1
5
am
6.3
6
am
3.5
7
am
1.5
8
am
1
9
am
2.4
10
am
5.1
11
am
8.2
12
pm
11
1
pm
12.8
2
pm
13.2
3
pm
12.2
4
pm
10
5
pm
6.9
6
pm
3.6
7
pm
0.8
8
pm
-0.5
9
pm
0.1
10
pm
2.3
11
pm
5.3


Weather Map
       (on/off)   Help Weather Map
wmap_P
GEOS Local Image of PacificNorthwest    EDIT
NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
Link to Loop

Other links: GEOS-West     Contential US     Full GOES-East
Ground Weather Radar Station




Please read website Cookie, Privacy, and Disclamers by clicking HERE.