Thursday, July29, 2021
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Marine Weather and Tides
Petersburg, 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 4:42AMSunset 9:26PM Thursday July 29, 2021 1:53 PM AKDT (21:53 UTC) Moonrise 11:18PMMoonset 11:51AM Illumination 70% Phase: Waning Gibbous; Moon at 20 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- 341 Am Akdt Thu Jul 29 2021
Today..E wind 10 kt early in the morning becoming light. Seas 2 ft or less.
Tonight..NE wind 10 kt. Seas 2 ft or less.
Fri..NE wind 10 kt becoming W in the afternoon. Seas 2 ft or less.
Fri night..W wind 10 kt. Seas 2 ft or less.
Sat..S wind 10 kt becoming w. Seas 2 ft or less.
Sun..Light winds becoming W 10 kt. Seas 2 ft or less.
Mon..Light winds. Seas 2 ft or less.


7 Day Forecast for Marine Location Near Petersburg, AK
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location: 56.63, -132.93     debug


Area Discussion for -
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FXAK67 PAJK 291411 AFDAJK

Southeast Alaska Forecast Discussion National Weather Service Juneau AK 611 AM AKDT Thu Jul 29 2021

SHORT TERM. /Thursday and Friday/ Little to no changes made to the short term forecast as a quiet summertime pattern continues for Southeast Alaska. High pressure remains over the gulf while an inverted trough builds over the Panhandle on Friday. With 850mb temps significantly warming to +10 to +14C, expect highs to progressively get warmer each day. Nudged temperatures slightly above MOS guidance for today as highs have been exceeding model guidance each day this week. Expect low to mid 70s for most locations today and then mid to upper 70s by Friday. It is not out of the question a few spots could reach the 80 degree mark Friday as north winds develop at the surface and east southeast flow sets up aloft leading to downsloping off the higher terrain.

Winds will remain unimpactful through the period with little forcing and a weak pressure gradient in place. Afternoon southerly sea breezes will develop once again this afternoon and evening with the strongest winds to 15 kt expected around Cross Sound and Icy Strait, Northern Lynn Canal, and Taiya Inlet. Flow switches around to the north on Friday as a thermal trough builds over the Panhandle, keeping sea breezes from developing in the afternoon for most places, with the exception of Upper Lynn Canal.

Only forecast concern is the potential for isolated thunderstorm development Friday and Saturday afternoon. Southeast flow increases ahead of an approaching surface low from the south Friday into Saturday. Aloft, a 50 kt mid level jet streak pushes into the Southern Panhandle placing the area within the right exit region of strongest winds. Typically this is an unfavorable area for precipitation development as the right exit region of the jet is characterized by upper level convergence and sinking air. This feature along with a building upper ridge out of the SE will work to suppress widespread convection Friday and Saturday. However, due to a hot, unstable airmass at the surface and increasing moisture flowing northward, there is a slight chance for showers and thunderstorms during the peak heating of the afternoon Friday and Saturday. Orographic lifting will be the main lifting mechanism for storms so expect the higher terrain of the Southern Panhandle to have the best chance at seeing a storm. CAPE values 500 j/kg, LIs -1 to -3, 0-6km bulk shear around 35 kt, and dew points rising into the upper 50s to near 60F will create favorable conditions for thunderstorm development if discrete cells begin to form. Not expecting widespread thunderstorm activity; however the possibility is there for a storm or two to produce a few lightning strikes and brief periods of heavy rain and gusty winds. Most places will remain dry; however it is important to highlight the slight chance of a storm. Overall a quiet next few days outside of any isolated shower or storm.

LONG TERM. /Saturday through Wednesday as of 10 pm Wednesday/ Low pressure that moves into the southern AK Gulf late Friday will meander about while weakening though Sunday. With the lows initial westerly position still expecting overall dry conditions with chance of showers rotating around the low moving over the panhandle. No real pressure gradient so any stronger winds should be thermally driven (sea breeze). Temperatures aloft on Saturday still around +12C at 850mb so places that do not get a sea breeze or have some downslope flow should easily hit the 70s. Due to these very warm surface temperatures resulting in more atmospheric instability have slight chance of thunderstorm development again Saturday. By Sunday a high pressure ridge to the west of the low starts to move eastward with frontal boundary extending from a Bering Sea low in the Western Gulf. As the Bearing Sea low and most other upstream features have been poorly depicted by both ensemble and operational models little confidence in weather for next week. Previously indications that this front would continue to moves east and reach the panhandle, now more indications that this front will remain to the west as high pressure again builds over the Gulf with lows moving up from the N Pacific. There is the trend indicated by standardized anomaly tables of cooler, but still above normal temperatures and most precip potential as easterly waves driven by lows moving up into the SE Gulf. However wouldn't bet any money on this looking at model run to run inconsistencies.

AJK WATCHES/WARNINGS/ADVISORIES. PUBLIC . None. MARINE . None.



CM/PRB

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 42 mi43 min NNW 8 G 8.9 63°F 63°F
FFIA2 - Five Finger, AK 58 mi53 min N 4.1 G 4.1 57°F 1021 hPa (-0.4)
CDEA2 - Cape Decision, AK 77 mi31 min WNW 5.1 G 7 65°F 1021.3 hPa50°F

Wind History for Port Alexander, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petersburg, AK13 mi57 minE 510.00 miOvercast61°F50°F67%1022.4 hPa

Link to 5 minute data for PAPG

Wind History from APG (wind in knots)
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Last 24hrNE5E4E4E4E4E5SE3SE5CalmCalmS3CalmCalmCalmSE3W3CalmNE3E4NE6E5E5E5E5
1 day agoE4NE3NE5E4E4CalmCalmE3CalmSW3CalmCalmCalmE3SE4--CalmCalmE3NE4E4E5NE5E6
2 days agoE4E4E4E5CalmW3CalmCalmCalm--CalmE3E3E3CalmW3CalmCalmN3CalmCalmNE3Calm4

Tide / Current Tables for Anchor Point, Alaska
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Anchor Point
Click for Map
Thu -- 01:03 AM AKDT     2.42 feet Low Tide
Thu -- 04:47 AM AKDT     Sunrise
Thu -- 07:11 AM AKDT     16.90 feet High Tide
Thu -- 11:51 AM AKDT     Moonset
Thu -- 01:13 PM AKDT     1.22 feet Low Tide
Thu -- 07:49 PM AKDT     17.50 feet High Tide
Thu -- 09:07 PM AKDT     Sunset
Thu -- 11:16 PM AKDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.72.43.35.99.212.715.516.916.213.810.16.12.81.31.84.17.511.214.616.917.516.213.49.9

Tide / Current Tables for Wrangell Narrows (off Petersburg), Alaska Current
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Wrangell Narrows (off Petersburg)
Click for Map
Thu -- 02:38 AM AKDT     3.30 knots Max Flood
Thu -- 04:46 AM AKDT     Sunrise
Thu -- 05:34 AM AKDT     -0.01 knots Slack
Thu -- 08:42 AM AKDT     -3.49 knots Max Ebb
Thu -- 11:51 AM AKDT     Moonset
Thu -- 11:55 AM AKDT     0.00 knots Slack
Thu -- 03:03 PM AKDT     3.53 knots Max Flood
Thu -- 06:15 PM AKDT     -0.01 knots Slack
Thu -- 09:08 PM AKDT     Sunset
Thu -- 09:22 PM AKDT     -3.09 knots Max Ebb
Thu -- 11:16 PM AKDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.62.43.23.32.61.1-0.8-2.4-3.3-3.5-2.9-1.80.22.13.23.53.32.20.5-1.3-2.5-3-3-2.3

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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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