Friday, April3, 2020
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Marine Weather and Tides
Whale Pass, 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 6:14AMSunset 7:46PM Friday April 3, 2020 3:46 PM AKDT (23:46 UTC) Moonrise 1:11PMMoonset 5:15AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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- 254 Pm Akdt Fri Apr 3 2020
Tonight..E wind 10 kt. Seas 2 ft or less. Rain early in the evening.
Sat..Light winds becoming E 10 kt in the afternoon. Seas 2 ft or less.
Sat night..Light winds. Seas 2 ft or less.
Sun..Light winds. Seas 2 ft or less.
Sun night..SE wind 10 kt. Seas 2 ft or less.
Mon..SE wind 20 kt. Seas 3 ft.
Tue..S wind 10 kt becoming e. Seas 2 ft or less.
Wed..Light winds. Seas 2 ft or less.


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 032302 AFDAJK

Southeast Alaska Forecast Discussion National Weather Service Juneau AK 302 PM AKDT Fri Apr 3 2020

SHORT TERM. /Friday evening through Sunday night/ The forecast for Friday has been going on as expected with light snow spreading across the Panhandle as a low in the gulf slides SE just offshore. One thing to note was just how dry the surface was Friday afternoon as there were 25 degree dewpoint depressions for many areas. The dry air was able to keep snowfall amounts on the light side and will continue to do so as precipitation spreads southward this evening and early tonight. Looking at bufkit profiles, the set up is not ideal for maximum dendrite production as max omega is located well below the dendritic growth zone. Small fine snowflakes, lift below the DGZ, and very dry surface conditions are not conducive for accumulating snow, especially in April. Expect the predominant p-type to remain snow, even across the south where temperatures have risen to around 40F with diurnal heating. Rain may mix with snow along the outer coast near Sitka as 1000-850 thickness straddles the 1290m line and "warmer" marine air gets starts mixing in. Overall, as light precip begins, expect snow melt cooling to take place, saturating and cooling the column down enough for a quick changeover to snow. Current thinking is that any accumulations that occur this evening and tonight will be on the light side.

Upper level ridging builds in on Saturday drying the Panhandle out once again. With the ridge axis tilted NE to SW and a NW flow overhead, expect higher clouds to stream in during the day across the northern Panhandle. Despite the stronger April sunshine, temperatures are still expected to be slightly below average as 850 temps aloft are still around -6C to -8C. Overall, a nice day spring day expected for Southeast Alaska.

On Sunday the ridge axis continues to slide eastward switching the flow around to the west. Onshore flow will allow clouds to be on the increase throughout the day from west to east across the Panhandle. By Sunday evening, the exit region of a strong jet streak and an area of strong PVA will be approaching the northern Panhandle allowing showers to develop. Showers will increase in coverage and intensity late sunday night, especially across the outer coast and the northern half of the Panhandle as westerly onshore flow increases. P-type could initially start as rain; however low 1000-850mb thickness values and cooling 850mb temps as cold air advection streams in will support a transition to snow late Sunday night. Overall, Sunday is not expected to be an impactful weather day with showers developing in the north later in the day while the Southern Panhandle remains mostly dry.

As far as winds, northerly outflow expected, mainly for the north, tonight through early tomorrow as the northerly pressure gradient increases behind the departing low. Winds are expected to become relatively calm across the Panhandle Saturday and into Sunday. The southerly pressure gradient increases Sunday night thus have increased southerly winds in the northern inner channels.

Forecast confidence is high through the period.

Aviation.

Current marginal and IFR conditions across the northern panhandle due to snow will improve throughout the evening. Skies are expected to lower across the southern Panhandle and along the southern outer coast Friday evening to MVFR levels. Conditions are expected to improve across the entire Panhandle late Friday night and VFR conditions should prevail through Sunday.

LONG TERM. /Sunday to Friday as of 10 pm Thursday/ . The ridging which has contributed to SE Alaska's string of sunny days will begin to slide E out of the panhandle. More zonal flow behind it will enable quick moving shortwaves to move across the Northern Gulf, interacting with the panhandle and bringing a renewed chance of precipitation next week.

In regards to surface features, the first system to impact the panhandle will be a shortwave trough which will interact with the area Sunday night into Monday. Sunday night in particular looks like it could see an inch or two of accumulating snow from this trough for Juneau and some other locations in the central panhandle. The key limiting factors in any accumulating snow will likely be the speed of the system combined with quickly rising daytime temperatures. Following the passage of this system, westerly flow will help continue to encourage the propagation of showers throughout the panhandle, and there is a chance of some follow-up snow showers Monday night in areas where the cloud deck proves insufficient for keeping temperatures above freezing.

The long range models solutions have continued to indicate the probable development of a low in the North Pacific which will enter the Gulf of Alaska and impact the panhandle sometime between Tuesday and Wednesday. There is still significant disagreement on what exact track it will take though some of the most recent model runs and ensembles have trended further to the west. As it stands currently, it looks like the majority of the panhandle will see precipitation out of this event-most likely with rain being predominant given the presence of the system's warm sector-but the timing and quantity of the precipitation will ultimately depend on what track the low takes, and the system will need to be monitored closely as additional data is received.

AJK Watches/Warnings/Advisories. PUBLIC . None. MARINE . None.



CM/GFS

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 mi37 min W 1 G 4.1 38°F 1017.2 hPa17°F
CDEA2 - Cape Decision, AK 64 mi25 min E 15 G 17 33°F 1017.4 hPa31°F
FFIA2 - Five Finger, AK 76 mi47 min SSE 8.9 G 15 32°F 1017.6 hPa (-1.3)

Wind History for Port Alexander, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Wrangell, AK34 mi51 minNW 710.00 miOvercast36°F10°F35%1018.6 hPa

Link to 5 minute data for PAWG

Wind History from AWG (wind in knots)
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Last 24hr----NE9NE6NE8E8NE9--E11
G17
----SE7SE6SE7SE5E9E8E8E55NW5NW5NW6NW7
1 day agoNW8NW9NW7SE5SE8E5E6Calm--SE3----SE3CalmSE6SE4SE4E3CalmNW5S6Calm--5
2 days ago--NE7NE8E7NE9E9E86SE5--E4E4--SE4SE4SE3E5E4N4W6NW5NW5W7W5

Tide / Current Tables for Exchange Cove, Alaska
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Exchange Cove
Click for Map
Fri -- 03:14 AM AKDT     5.60 feet Low Tide
Fri -- 05:14 AM AKDT     Moonset
Fri -- 06:15 AM AKDT     Sunrise
Fri -- 09:26 AM AKDT     12.72 feet High Tide
Fri -- 01:11 PM AKDT     Moonrise
Fri -- 04:07 PM AKDT     0.78 feet Low Tide
Fri -- 07:36 PM AKDT     Sunset
Fri -- 10:46 PM AKDT     12.35 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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97.56.25.65.86.98.510.311.812.612.511.49.26.43.71.70.81.335.58.210.51212.3

Tide / Current Tables for St.John Harbor, Zarembo Island, Alaska
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St.John Harbor
Click for Map
Fri -- 03:15 AM AKDT     5.50 feet Low Tide
Fri -- 05:15 AM AKDT     Moonset
Fri -- 06:14 AM AKDT     Sunrise
Fri -- 09:27 AM AKDT     12.42 feet High Tide
Fri -- 01:10 PM AKDT     Moonrise
Fri -- 04:08 PM AKDT     0.68 feet Low Tide
Fri -- 07:36 PM AKDT     Sunset
Fri -- 10:47 PM AKDT     12.05 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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8.87.46.15.55.76.78.31011.512.312.311.196.33.61.60.71.22.85.37.910.211.712

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for (19,4,5,8)
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Ground Weather Radar Station Biorka Is., AK
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weather_mapweather_map weather_map

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Disclaimer:
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.