Sunday, March7, 2021
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Marine Weather and Tides
Kupreanof, AK

Version 3.4
NOTICE
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 6:32AMSunset 5:44PM Sunday March 7, 2021 6:42 PM AKST (03:42 UTC) Moonrise 5:21AMMoonset 11:29AM Illumination 30% Phase: Waning Crescent; Moon at 24 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- 332 Pm Akst Sun Mar 7 2021
Tonight..Light winds becoming E 10 kt in the evening. Seas 2 ft or less.
Mon..N wind 10 kt. Seas 2 ft or less. Rain showers.
Mon night..N wind 15 kt. Seas 3 ft.
Tue..N wind 15 kt. Seas 3 ft.
Tue night..NW wind 10 kt. Seas 2 ft or less.
Wed..S wind 15 kt. Seas 3 ft.
Thu..E wind 15 kt. Seas 3 ft.
Fri..S wind 10 kt. Seas 2 ft or less.


7 Day Forecast for Marine Location Near Kupreanof, AK
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location: 56.65, -133.15     debug


Area Discussion for -
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FXAK67 PAJK 072347 AFDAJK

Southeast Alaska Forecast Discussion National Weather Service Juneau AK 247 PM AKST Sun Mar 7 2021

SHORT TERM . /Through Monday night/ . A low well to the south that produced showers last night and yesterday remains nearly stationary near 50N and continues to rotate bands of showers as far north as the southern inner channels. Forecast thinking yesterday was that one more band of showers would impact Southeast Alaska tonight through Monday night. That band of showers is still in the forecast, but looking at today's model data, the source for that band does not appear to be the low to the south. A closer look reveals an upper level trough dropping south from the Yukon with a substantial amount of mid level vorticity. This is an interesting point of note for meteorologists, but is really just academic. The bottom line is that there will be showers developing over the central panhandle tonight and spreading south through Monday and Monday night. Models are consistent with regard to a colder low level airmass dropping south from the Yukon through this short term forecast period. In addition to decreasing high and low temperatures for the next couple days, the upcoming shower activity is also expected to produce measurable snowfall beginning tonight. Daytime temps tomorrow should transition the snow back to rain on Monday, but overnight lows Monday night will cause a transition back to snow where showers persist.

The low to the south and high pressure over the interior and northwest Canada will maintain a northerly pressure gradient. This will cause northerly small craft winds over Lynn Canal and northern Stephens Passage through Monday night. This plus the colder air coming from Canada will result in light freezing spray for Lynn Canal at night both tonight and Monday night.

As the shower activity moves off to the south, skies will begin to clear. Look for partly cloudy to mostly clear skies over the northern half of the Panhandle by Monday morning and over the southern half by Tuesday morning. That'll be my day off, so I think I'll go flight-seeing and maybe grab lunch in Sitka.

LONG TERM . /Tuesday through Sunday/ . Before the upper level trough moves out on Tuesday, mostly clear skies are expected across the panhandle during the day. Guidance has slowed the next weather system and will make it into the panhandle by early Wednesday with widespread precipitation in the afternoon. Once this system moves south Thursday, it may be followed by a weak atmospheric river impacting the southern panhandle. Models are optimistic and show another chance for dry weather and clear skies on Saturday.

Models have slowed the start of precipitation from our next system to early Wednesday morning. Precipitation will start in Yakutat, become widespread in the afternoon, and then move south. Winds will pick up with this front, and small craft advisories can be anticipated along the outer coast and inner channels. Snow possibilities for midweek are uncertain and could range up to advisory totals in areas including and north of Angoon and Juneau. The southern portion of the panhandle is forecasted to receive additional precipitation from a weak atmospheric river late on Thursday, though there is uncertainty on if the track of this system will move further south.

The long term precipitation forecast is a blend of GFS/NAM for Tuesday, and nudged to the GFS for the remainder of the week. This adjusted the surface weather front timing and speed. Temperatures for Friday and Saturday were trended down based on MOS and plume guidance. Overall confidence is moderate for temperature changes, but below average on which locations will see the most precipitation through the week.

AJK WATCHES/WARNINGS/ADVISORIES. PUBLIC . None. MARINE . Small Craft Advisory for PKZ012-013-022-031-041>043-051-052.



Fritsch/KRT

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 48 mi92 min SE 8.9 G 14 44°F 1012.6 hPa44°F
FFIA2 - Five Finger, AK 50 mi42 min NW 8 G 8.9 41°F 1013.7 hPa (+1.1)
CDEA2 - Cape Decision, AK 69 mi80 min Calm G 1 44°F 1013.4 hPa35°F

Wind History for Port Alexander, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petersburg, AK16 mi46 minS 410.00 miPartly Cloudy36°F32°F86%1014.6 hPa

Link to 5 minute data for PAPG

Wind History from APG (wind in knots)
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Last 24hrE5E8SE5S5N4SE4S5SW3S4S3CalmCalmCalmCalmCalmNE3E3E4E4E4E3E3SE3S4
1 day agoCalmCalmW3W4W3SW3CalmW3W3W4CalmS3CalmW3SW3CalmCalmE8SE7SE55E4CalmCalm
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Tide / Current Tables for Castle Islands, Duncan Canal, Alaska
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Castle Islands
Click for Map
Sun -- 12:55 AM AKST     5.47 feet Low Tide
Sun -- 04:21 AM AKST     Moonrise
Sun -- 06:28 AM AKST     Sunrise
Sun -- 07:29 AM AKST     14.08 feet High Tide
Sun -- 10:29 AM AKST     Moonset
Sun -- 02:23 PM AKST     1.37 feet Low Tide
Sun -- 05:39 PM AKST     Sunset
Sun -- 09:24 PM AKST     11.40 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.95.567.49.211.3131413.912.710.47.64.82.61.51.62.74.56.78.810.511.311.210.1

Tide / Current Tables for Wrangell Narrows (off Petersburg), Alaska Current
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Wrangell Narrows (off Petersburg)
Click for Map
Sun -- 01:43 AM AKST     0.00 knots Slack
Sun -- 04:22 AM AKST     Moonrise
Sun -- 05:08 AM AKST     2.23 knots Max Flood
Sun -- 06:27 AM AKST     Sunrise
Sun -- 07:52 AM AKST     -0.01 knots Slack
Sun -- 10:26 AM AKST     Moonset
Sun -- 11:55 AM AKST     -2.97 knots Max Ebb
Sun -- 02:57 PM AKST     0.00 knots Slack
Sun -- 05:38 PM AKST     Sunset
Sun -- 06:30 PM AKST     2.68 knots Max Flood
Sun -- 09:45 PM AKST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.6-0.90.41.62.12.221.2-0.2-1.4-2.3-2.8-3-2.6-1.50.11.222.62.61.80.8-0.2-1.1

Weather Map
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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.
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