Tuesday, December10, 2019
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Marine Weather and Tides
Whale Pass, AK

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 8:31AMSunset 3:09PM Tuesday December 10, 2019 2:05 AM AKST (11:05 UTC) Moonrise 3:49PMMoonset 7:12AM Illumination 98% Phase: Waxing Gibbous; Moon at 13 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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PKZ035 Sumner Strait- 310 Pm Akst Mon Dec 9 2019
.small craft advisory this evening...
Tonight..E wind increasing to 25 kt this evening...then diminishing late. Gusts to 40 kt. Seas 5 ft, except 8 ft near ocean entrances.
Tue..E wind 20 kt. Seas 4 ft, except 7 ft near ocean entrances. Rain in the morning, then rain showers in the afternoon.
Tue night..E wind 15 kt increasing to 25 kt late. Seas 4 ft, except 6 ft near ocean entrances. Rain.
Wed..E wind 25 kt. Gusts to 40 kt. Seas 5 ft, except 8 ft near ocean entrances. Rain.
Wed night..E wind 20 kt. Gusts to 35 kt. Seas 4 ft, except 9 ft near ocean entrances. Rain.
Thu..SE wind 20 kt. Seas 4 ft.
Fri..E wind 15 kt. Seas 3 ft.
Sat..E wind 15 kt. Seas 3 ft.


7 Day Forecast for Marine Location Near Whale Pass, AK
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location: 56.28, -132.99     debug


Area Discussion for -
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FXAK67 PAJK 100012 AFDAJK

Southeast Alaska Forecast Discussion National Weather Service Juneau AK 312 PM AKST Mon Dec 9 2019

SHORT TERM. Water Vapor and IR satellite imagery continue to depict a front in the Gulf which has been slowly advancing towards the panhandle throughout the day. The moisture plume associated with the front has begun to push into the area, helping to generate the generally overcast conditions throughout SE Alaska. As the frontal band moves into the area, precipitation will steadily push into most of the panhandle, driven largely by continued warm air advection and the front's moisture plume. Given the current air mass in place, and with the presence of continued warm air advection aloft, precipitation will be mainly rain in nature, although parts of the Klondike Highway, and even the Haines Highway, may see some snow towards the latter half of Tuesday and into Wednesday. The possibility of a wave developing along the front and moving north into the southern and central panhandle on Tuesday has diminished considerably, and although the GFS continues to push for its development as of the time of writing, the synoptic forcing and low level temperature gradient which would normally spur the development of such a feature do not look all that favorable at this time, so left it out of the forecast. Fog continues to remain a concern, with both Juneau and parts of Icy Strait continuing to experience fog. The fog in Juneau has brought visibilities down to 1/4 statute mile repeatedly, meriting a dense fog advisory for Juneau. The fog is currently progged to linger through many of the evening hours tonight, before some additional mixing should help encourage its dissipation.

As the first front weakens Tuesday evening and Wednesday morning, the next system will be lining up to impact the panhandle. A developing low out of the central Pacific will steadily deepen to near 960 mb and move northward, sending an associated front into Southeast Alaska Wednesday, bringing with it more rain and wind. The low will meander in the northern gulf throughout the next few days, bringing with it a steady stream of moisture-and rain, through Wednesday night.

Another forecast concern over the next few days will be temperatures. The warm air advection associated with the system currently approaching the panhandle is proving to largely be an overrunning event, and areas that see this warmer air mixing down to the surface will see their temperatures rise considerably, while locations without mixing are likely to see their temperatures capped by comparison. At least one location (Sitka) which had warmer air mixing down today saw temperatures rise above 50 degrees Fahrenheit, and will need to continue to monitor stability in the boundary layer for tomorrow.

The strongest of the winds and waves associated with these next two fronts currently look like they'll remain confined largely to coastal and offshore waters as well as channel entrances, and in these locations gale force winds as well as 25 knot small craft advisory strength conditions will be a concern. The pressure gradient for both of these systems does not currently appear very favorable for strong winds in north/south oriented channels. Given that it will remain largely parallel to the coast, the east/west channels will blow harder with occasional higher gusts, especially in conjunction with the Wednesday front. Overall, forecast confidence is average.

LONG TERM. /Wednesday through Monday as of 10 pm Sunday/ Upper level pattern for the long range features a gradual shift to a more progressive zonal flow across the northern Pacific by the end of the period. Initially an upper low will be nearly stationary in the western Gulf through at least Thu night, but it will then get pushed north as the more zonal flow sets up into the weekend. After that point, structure and timing of individual troughs that are being pushed east is rather inconsistent between forecast models so forecast confidence past Thu night is low.

At the surface, the start of the long range has the panhandle dealing with a gale force front that will be moving N through the gulf and panhandle on Wed. Not much change for this feature compared to yesterday as structure and timing remain relatively the same. Warm air continues to be pumped into the panhandle by this system so rain at sea level will continue with snow levels hovering between 1000 and 3000 feet for most of the panhandle into late week.

Into next weekend and early next week, SW to S flow will continue to be the dominate feature of the forecast with embedded troughs continuing to bring precip to the area. Timing and strength of each of these trough remains debatable so the forecast mainly rely on the general trends displayed. For this period, the general trend is toward continued showery weather with a gradual cooling trend. Some northern panhandle areas like Haines and Skagway may get cold enough for some snow rather then rain by the weekend, but for most areas rain will remain the main ptype. Favored WPC and NBM for updates today.

AJK Watches/Warnings/Advisories. PUBLIC . Dense Fog Advisory until 1 AM AKST Tuesday for AKZ025. MARINE . Gale Warning for PKZ041>043-051-052. Small Craft Advisory for PKZ022-033-035-036-053.



GFS/EAL

Visit us at http://www.weather.gov/Juneau


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LCNA2 - Lincoln Rock, AK 22 mi56 min SE 26 G 35 48°F 1008.5 hPa37°F
CDEA2 - Cape Decision, AK 64 mi44 min E 18 G 25 46°F 1007.8 hPa40°F
FFIA2 - Five Finger, AK 76 mi66 min NNE 8.9 G 8.9 40°F 1009.7 hPa (-1.5)

Wind History for Port Alexander, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Wrangell, AK34 mi2.2 hrsVar 510.00 miFair41°F35°F79%1012.4 hPa

Link to 5 minute data for PAWG

Wind History from AWG (wind in knots)
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Last 24hrSE5SE3SE7E4E8E6E7E7E6E7NE7E74NE7E3----E7E7--E85--SE4
1 day agoE6----W3--E3E8E7----E84CalmCalmE8E5N3CalmSE53E4E9NE4Calm
2 days agoCalm----W3CalmCalmE3E4E4----CalmNW3NW4NW4NW3W3CalmW4CalmS3SW4--E3

Tide / Current Tables for Exchange Cove, Alaska
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Exchange Cove
Click for Map
Tue -- 05:01 AM AKST     3.61 feet Low Tide
Tue -- 06:12 AM AKST     Moonset
Tue -- 08:13 AM AKST     Sunrise
Tue -- 11:17 AM AKST     16.03 feet High Tide
Tue -- 02:49 PM AKST     Moonrise
Tue -- 03:16 PM AKST     Sunset
Tue -- 05:44 PM AKST     -0.73 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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13.111.79.26.54.43.64.36.49.312.314.71615.613.5105.92.2-0.2-0.70.73.5710.312.8

Tide / Current Tables for St.John Harbor, Zarembo Island, Alaska
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St.John Harbor
Click for Map
Tue -- 05:02 AM AKST     3.51 feet Low Tide
Tue -- 06:13 AM AKST     Moonset
Tue -- 08:14 AM AKST     Sunrise
Tue -- 11:18 AM AKST     15.73 feet High Tide
Tue -- 02:47 PM AKST     Moonrise
Tue -- 03:14 PM AKST     Sunset
Tue -- 05:45 PM AKST     -0.83 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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12.811.496.44.33.54.26.291214.415.615.313.39.85.82.1-0.3-0.80.63.36.71012.5

Weather Map
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wmap_P
GEOS Local Image of PacificNorthwest    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
Wind Forecast for (6,6,7,8)
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Ground Weather Radar Station Biorka Is., 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 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.