Monday, March27, 2017 L-36.com


Marine Weather and Tides
Petersburg, AK

Version 3.4
What's New / NOTES
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:33AMSunset 7:32PM Monday March 27, 2017 6:21 PM AKDT (02:21 UTC) Moonrise 6:49AMMoonset 7:03PM Illumination 0% Phase: New Moon; Moon at 1 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- 316 Pm Akdt Mon Mar 27 2017
Tonight..S wind 20 kt becoming ne 10 kt late. Seas 4 ft subsiding to 2 ft late...except seas 6 ft near ocean entrances. Rain showers in the evening.
Tue..NW wind 10 kt becoming sw in the afternoon. Seas 2 ft or less...except 5 ft near ocean entrances.
Tue night..SE wind 15 kt. Seas 3 ft...except 6 ft near ocean entrances.
Wed..E wind 15 kt. Seas 3 ft.
Wed night..SE wind 10 kt. Seas 2 ft or less.
Thu..SE wind 20 kt. Seas 4 ft.
Fri..SE wind 25 kt. Seas 5 ft.
Sat..E wind 20 kt. Seas 4 ft.

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 272311
afdajk
southeast alaska forecast discussion
national weather service juneau ak
311 pm akdt Mon mar 27 2017

Short term A complex mess of systems will be affecting the
area through tue. A low over the e-central gulf will move nnw and
dissipate along the N gulf coast by late this evening. Another low
will move NE across haida gwaii late tonight, then into central bc
tue. Yet another low will move N into the W gulf tue. The lows
will also have sfc trofs associated with them, mainly on S and e
sides. Used blend of the 12z GFS and NAM to handle things through
tue.

Main forecast concerns will be precip potential/ptype/amounts and
winds. As of 23z... Rain was falling over most of the area, with
some snow still reported over the haines/chilkat valley area. As
low moves past area to the W tonight, it will sweep a trof through
the area and precip should become showery and diminish over the n
and central panhandle. The far S will keep some rain going as
next low brushes past them to their S overnight and Tue morning.

Once this low moves inland Tue afternoon precip should decrease
over the s. Over the NE gulf coast, they will be in and out of
precip through Tue with multiple lows/trofs affecting them. The
snow in the haines/chilkat valley area should change to rain as
warmer air moves in this evening. Not expecting much more snowfall
there... Possibly another inch or two.

Winds will be strongest near the multitude of lows and trofs. Up
to SCA level winds are expected near the main lows and trofs
moving through, with most of the stronger winds over the gulf.

Will have some 20-25 kt e-se winds over much of the central and s
inner channels until trof moves through this evening. After that,
winds on inner channels will be in the 10-20 kt range although the
central inner channels may get fairly light overnight and tue
morning with weak pressure gradient there.

Otherwise, think central panhandle could get patchy fog overnight
as breaks in clouds occur and winds become light. It will be
rather short lived though as temps will rapidly warm Tue morning
in the late march sun.

Long term /tue night through mon/ upper level trough over the
ak peninsula will finally shift to the northeast while an upper
level ridge crosses in to the central ak gulf by Wednesday
evening. As the ridge continues to track eastward over the
panhandle the next significant low will move just south of the
aleutian chain by Thursday. This upper low will then expand over
the western portion of the ak interior by Friday. After
that... Uncertain on how it will eventually move.

At the surface, the low moving up the central gulf will reach
prince william sound Tuesday evening with the associated front
tracking over the eastern gulf and then the panhandle through
Wednesday. Gulf winds pick up to MAX small craft along the front
with potential gales. Precip from this front will mainly be
focused on the northeast gulf and north central panhandle.

Southwesterly flow starting a warming trend so expect more rain
than snow with only minor accumulations of a couple of inches for
the far north and at higher elevations. Surface ridge builds over
the gulf behind the front for a drying trend starting late
Wednesday night into Thursday. This will be short lived.

The next major low will have moved south of the aleutians by this
time with associated gale force front crossing into the central
gulf. The front will reach the eastern gulf then panhandle early
Thursday evening into Friday morning. Winds will reach at least
gale force over the gulf and potentially higher. Small craft
winds will increase over the inner channels. With the warm
southerly flow once again expect more rain than anything from this
front, but that rain may be heavy. The surface low will
eventually track eastward through the weekend followed by weak
ridging.

New model runs were mostly in line with previous forecast
regarding position of the incoming system, a slight increase in
speed for the Thursday evening low/front. Mostly
refreshed/increased winds to a blend of gfs/ecmwf and increased
pops for the Thursday front. Due to southwesterly flow did not
drop pops off completely between systems but greatest chance for
dry/clear skies is over the southern panhandle. More indications
of warmer overnight temps due to higher 850 mb temps/sw flow and
precip/cloud cover so also nudged up lows a few degrees. Forecast
confidence is average.

Ajk watches/warnings/advisories
Public... None.

Marine... Small craft advisory for pkz022-034-036-043-051>053.

Small craft advisory due to seas for pkz041-042.

Rwt/prb
visit us at http://

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LCNA2 - Lincoln Rock, AK 42 mi71 min SE 14 G 21 42°F 1002.4 hPa39°F
FFIA2 - Five Finger, AK 58 mi81 min SSE 15 G 22 42°F 1002.1 hPa (+0.9)
CDEA2 - Cape Decision, AK 77 mi59 min S 8.9 G 19

Wind History for Port Alexander, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Petersburg, AK13 mi25 minN 07.00 miLight Rain39°F37°F93%1004.4 hPa

Wind History from APG (wind in knots)
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Last 24hrSE4CalmCalmCalm----------------NE4SW4CalmS6E3E7SE8SE8SE3SE7CalmCalm
1 day agoCalmCalmCalmCalmCalmCalmCalmSW4CalmCalmCalmSW3CalmCalmW3E5CalmS6NE5NE7E6E7SE6E5
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE3E4CalmE5E3

Tide / Current Tables for Anchor Point, Cook Inlet, Alaska
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Anchor Point
Click for Map
Mon -- 01:22 AM AKDT     16.80 feet High Tide
Mon -- 06:33 AM AKDT     Sunrise
Mon -- 06:49 AM AKDT     Moonrise
Mon -- 07:37 AM AKDT     -0.35 feet Low Tide
Mon -- 01:31 PM AKDT     17.43 feet High Tide
Mon -- 06:59 PM AKDT     New Moon
Mon -- 07:02 PM AKDT     Moonset
Mon -- 07:21 PM AKDT     Sunset
Mon -- 07:54 PM AKDT     -1.52 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
14.616.616.414.210.56.22.40.1-0.22610.614.717.117.215.111.36.72.4-0.6-1.503.78.5

Tide / Current Tables for Point Lockwood, Woewodski Island, Wrangell Narrows, Alaska
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Point Lockwood
Click for Map
Mon -- 01:22 AM AKDT     16.40 feet High Tide
Mon -- 06:33 AM AKDT     Sunrise
Mon -- 06:49 AM AKDT     Moonrise
Mon -- 07:17 AM AKDT     -0.25 feet Low Tide
Mon -- 01:31 PM AKDT     17.03 feet High Tide
Mon -- 06:59 PM AKDT     New Moon
Mon -- 07:02 PM AKDT     Moonset
Mon -- 07:21 PM AKDT     Sunset
Mon -- 07:34 PM AKDT     -1.42 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
14.516.31613.69.75.31.7-0.20.32.86.71114.616.716.814.510.55.81.5-1-1.20.94.69.1

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for (22,6,7,8)
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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 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.