Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
Sitka and, AK

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 5:13AMSunset 8:37PM Wednesday April 25, 2018 12:33 AM AKDT (08:33 UTC) Moonrise 2:03PMMoonset 3:39AM Illumination 75% Phase: Waxing Gibbous; Moon at 10 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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PKZ032 Northern Chatham Strait- 325 Pm Akdt Tue Apr 24 2018
Tonight..SW wind 15 kt becoming S late. Seas 3 ft. Rain showers early in the evening.
Wed..S wind 20 kt. Seas 4 ft.
Wed night..SW wind 10 kt. Seas 2 ft or less.
Thu..NW wind 15 kt. Seas 3 ft.
Thu night..NW wind 15 kt. Seas 3 ft.
Fri..NW wind 10 kt. Seas 2 ft or less.
Sat..N wind 10 kt. Seas 2 ft or less.
Sun..NW wind 10 kt. Seas 2 ft or less.

7 Day Forecast for Marine Location Near Sitka and , AK
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location: 57.04, -135.39     debug


Area Discussion for -
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Fxak67 pajk 242143
afdajk
southeast alaska forecast discussion
national weather service juneau ak
143 pm akdt Tue apr 24 2018

Short term Wet, cold, and windy is the story of the day. Shower
activity has diminished (minus a few locations across the
panhandle), as an upper-level shortwave moves eastward. Most of
this precipitation will shear apart into the evening hours. The
next weather front in the central panhandle is currently tracking
eastward across the central gulf, to impact the northern panhandle
tonight.

Minimal changes to pressure were needed, with most adjustments
done between the Wednesday and Wednesday night period using a
gfs ec blend. Mostly local edits were made in the wind grids:
increasing winds in the skagway white pass area, wind directions
that had already shifted, and decreasing some of the marine winds.

Skagway and white pass could see gusts up to 50 mph with some
locally higher gusts possible. The namnest was not picking up on
this pattern, however, standard deviations were showing values 5-6
above normal in the 700 mb wind field.

There will be a warming trend towards the end of the week with
guidance suggesting 60 degree temps over the southern panhandle.

At this point, models are showing a warm "blob" near 8 c (~46 f)
at the 850 mb level. We went towards trending of increasing
temperatures, especially over the southern panhandle.

Not many changes were necessary to pop, except for expanding the
coverage. QPF values were bumped up to account for Thursday's
water vapor transport. Fog could become a concern late tonight as
some southern panhandle locations start to clear out. Model
agreement looks great through tomorrow night, but will trend
upwards if we see any indication in upcoming model runs.

Long term Thursday through Tuesday as of 10 pm Monday
slowed the eastward movement of the occluded front early in the
period (daytime thu), but it should dissipate by Thu evening. Used
18z GFS to handle the 12z thu-06z Fri time frame. Still some
questions about potential systems moving into the area over the
weekend, with GFS most bullish with precip threat and gem ec both
fairly dry over the area. Decided to stay the course for the fri
to Sun period to allow the models a chance to sort out the
details better. Did bring in latest wpc for 12z Mon onward, which
pushed the sfc ridge further S over the gulf than previous
forecast had it.

For Thu into Thu night, kept in the higher pops over the N half of
the area, but the precip should diminish from the NW through the
daytime hours. Am expecting Thu night to be mainly dry with high
pressure building across the area from the sw.

For fri-sun, sticking with low pop forecast for now, but later
shifts will need to monitor this time frame for potential precip
threats, especially sat-sun. Even mon-tue seem to be tricky as the
model differences persist during early next week. Forecast
confidence for the sat-tue time frame is low at this point.

Ajk watches warnings advisories
Public... Strong wind through Wednesday afternoon for akz018.

Strong wind late tonight for akz017.

Marine... Gale warning for pkz012-051-052.

Small craft advisory for pkz013-021-022-042-043-053.

Small craft advisory due to seas for pkz041.

Ss rwt
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SHXA2 2 mi29 min NNE 4.1 G 5.1 40°F 1029.1 hPa35°F
ITKA2 3 mi45 min 42°F 44°F1029.2 hPa
STXA2 5 mi29 min SSE 5.1 G 8.9 42°F 1029 hPa34°F
PGXA2 41 mi29 min E 9.9 G 14 41°F 1027 hPa35°F
TKEA2 - Tenakee Springs, AK 52 mi31 min N 2.9 G 5.1 40°F 1027.1 hPa34°F
PLXA2 - 9451054 - Port Alexander, AK 67 mi51 min S 4.1 G 8 44°F 44°F1030.1 hPa
ELFA2 - 9452634 - Elfin Cove, AK 94 mi45 min 1027.4 hPa

Wind History for Port Alexander, AK
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Sitka - Sitka Airport, AK3 mi40 minE 410.00 miOvercast42°F39°F92%1029 hPa

Wind History from ASI (wind in knots)
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Last 24hrS9S7S5S7E4E8SE5SE5E6SE63SW5SW5SW8SW8S4S6SW8SE4SE4E4E4E7E4
1 day agoSE12SE13SE15
G25
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2 days agoE7E10SE9SE9SE11E10SE10SE13E12SE11SE14SE13S10SE13SE16
G21
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Tide / Current Tables for Dog Point, Lisianski Peninsula, Sitka Sound, Alaska
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Dog Point
Click for Map
Wed -- 04:07 AM AKDT     2.78 feet Low Tide
Wed -- 04:38 AM AKDT     Moonset
Wed -- 05:26 AM AKDT     Sunrise
Wed -- 09:55 AM AKDT     8.55 feet High Tide
Wed -- 03:03 PM AKDT     Moonrise
Wed -- 04:27 PM AKDT     0.39 feet Low Tide
Wed -- 08:33 PM AKDT     Sunset
Wed -- 10:55 PM AKDT     9.35 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.35.94.43.32.83.14.15.67.18.28.586.84.931.40.50.51.63.45.57.58.99.3

Tide / Current Tables for Olga Point, Olga Strait, Sitka Sound, Alaska
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Olga Point
Click for Map
Wed -- 04:21 AM AKDT     2.78 feet Low Tide
Wed -- 04:39 AM AKDT     Moonset
Wed -- 05:27 AM AKDT     Sunrise
Wed -- 09:59 AM AKDT     8.45 feet High Tide
Wed -- 03:03 PM AKDT     Moonrise
Wed -- 04:41 PM AKDT     0.39 feet Low Tide
Wed -- 08:34 PM AKDT     Sunset
Wed -- 10:59 PM AKDT     9.25 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.464.63.42.833.95.36.888.486.95.23.31.60.60.41.335.27.28.79.3

Weather Map and Satellite Images
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GOES 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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Wind Forecast for (4,6,7,8)
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Ground Weather Radar Station Biorka Is., AK
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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.