Friday, May25, 2018 L-36.com


Marine Weather and Tides
Whittier, AK

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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.

Sunrise 4:42AMSunset 11:10PM Friday May 25, 2018 10:51 AM AKDT (18:51 UTC) Moonrise 4:47PMMoonset 3:32AM 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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PKZ129 Passage Canal- 352 Am Akdt Fri May 25 2018
Today..Variable wind less than 10 kt. Seas 2 ft. Rain.
Tonight..E wind 10 kt. Seas 2 ft. Rain showers.
Sat..Variable wind less than 10 kt. Seas 2 ft.
Sat night..Variable wind less than 10 kt. Seas 2 ft.
Sun through Mon..Variable wind 10 kt. Seas 2 ft.
Tue..E wind 10 kt. Seas 2 ft.

7 Day Forecast for Marine Location Near Whittier, AK
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location: 60.63, -148.17     debug


Area Discussion for -
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Fxak68 pafc 251251
afdafc
southcentral and southwest alaska forecast discussion
national weather service anchorage ak
451 am akdt Fri may 25 2018

Analysis and upper levels
A broad upper level trough is in place over much of the state
this morning extending as far south as the north pacific. The
trough axis is oriented from the northeast to the southwest with a
stacked low anchoring the trough over dutch harbor. The low is
weakening as it moves southeastward into the gulf, bringing
showers to the eastern aleutians and ak pen. Behind this trough, a
ridge is building in over the bering, bringing northerly winds to
the central and eastern aleutians.

For southcentral, a weak surface low in the northern gulf is
delivering rain showers to the coastline. Surface observations
across anchorage show that winds have generally trended down
overnight. However gusty southeasterly flow will return later in
the day as the associated front moves inland, with the areas on
the lee-side of the chugach range experiencing drier conditions
due to downsloping.

Model discussion
Guidance remains in good agreement with the position and timing
of the low over dutch harbor entering the gulf tonight.

Disagreement arises later into the weekend as the low moves into
the northeastern gulf. The NAM appears to be the outlier with a
more easterly track. As a result, forecasters relied more on the
gfs ec solution. Out west, models are in good agreement with the
building ridge over the bering. Forecasters trended toward higher-
resolution models for guidance on the northerly winds building
over the aleutians, though extensive edits were made to account
for known gap-winds and other areas with terrain-induced flow.

Aviation
Panc...VFR conditions will persist through the TAF period. Gusty
winds along turnagain arm subsided during the early morning hours,
and will pick back up again this afternoon evening.

Short term forecast southcentral alaska (days 1 and 2)
A weather system over the northern gulf will push inland and
dissipate later today. This will bring another round of rain and
showers to coastal locations through early Saturday, mainly over
the eastern kenai and kodiak island. Some showers are expected
over the inland mountains today and Saturday, with some diurnal
enhancement. Inland valley locations will remain mostly dry,
although a shower or two could drift off the mountains. A thermal
trough dropping south from central alaska Saturday will bring a
slight chance of thunderstorms for the copper river basin and the
northern susitna valley. Southeasterly gap winds will return this
afternoon and evening for turnagain arm, south and west anchorage,
knik river valley, and perhaps the copper river basin. These
winds will be a little less than those experienced on Thursday,
as the gradient is not quite as strong.

Short term forecast southwest alaska (days 1 and 2)
The persistent easterly flow will shift more northeasterly today
as the upper level low, now south of the eastern aleutians,
tracks east into the southwestern gulf. For southwest alaska this
will mean the return of the thermal trough as it starts building
south along the western foothills of the alaska and aleutian
range. Instability will be fairly marginal but should be
sufficient for a few isolated thunderstorms to develop along with
the usual scattered afternoon and evening showers. The thermal
trough will become better defined on Saturday, bringing an
increased likelihood and coverage of thunderstorms to middle
kuskokwim valley and northern greater bristol bay area. On Sunday
the upper level ridge shifting into the eastern bering will put
southwest alaska into somewhat drier northwesterly flow aloft and
shift the thunderstorm threat east, to be confined to the alaska
range.

Short term forecast bering sea aleutians (days 1 and 2)
Upper level ridging will continue to build over the western bering
as the elongated upper level low stretching from the eastern
aleutians across the alaska peninsula swings to the southeast
today and then tracks away to the east and into the southwestern
gulf tonight and Saturday. The ridging will build east tonight to
cover the entire bering by Saturday. Northerly flow will increase
across the eastern bering and through the eastern aleutians and
alaska peninsula this afternoon through Saturday before turning
more northwesterly but persisting into Sunday as the upper ridge
shifts east so that its axis is centered over the eastern bering.

A weak frontal system will approach the western aleutians on
Saturday, then strengthen as it continues east Saturday night and
Sunday as developing north pacific low strengthens and tracks
northeast towards the central aleutians.

Long term forecast (days 3 through 7)
The long term forecast beginning Sunday starts with a weakening
surface low over the eastern gulf of alaska being pushed east
into the panhandle as an upper ridge builds in over the western
and central parts of mainland ak. By Monday, the ridge axis looks
to be centered right over southecentral setting the stage for a
decent memorial day with mostly dry conditions, clearing skies,
and slightly warmer temperatures than seen over the past week.

Some diurnally driven convection will likely develop over the
higher terrain in the late afternoon hours as warmer temperatures
inland will help develop a thermal trough kicking off showers and
even some possible isolated thunderstorms.

Looking past memorial day, models are coming into better agreement
regarding the next system moving in from the bering, with a front
extending out from a low center over the eastern bering moving
across the west coast by Monday evening into Tuesday morning. The
front does look to weaken some as it moves further east towards
southcentral during the day on Tuesday as it runs into an upper
ridge axis extending south from the arctic. The GFS tries to keep
the front more intact as it moves east while the ec rapidly
weakens the system. Regardless, there is consensus in a return to
cooler and wetter weather next week as the upper low builds back
in over the bering and western alaska.

Afc watches warnings advisories
Public... None.

Marine... None.

Synopsis and model discussion... Ko tp
southcentral alaska... Bl
southwest alaska bering sea aleutians... Jer
long term... Kvp


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLIA2 - Bligh Reef Light, AK 70 mi81 min Calm G 0 45°F 1008.2 hPa
SWLA2 - 9455090- Seward, AK 75 mi81 min 43°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Portage, Portage Glacier, AK37 mi58 minno data10.00 miOvercast46°F37°F73%1007.8 hPa

Wind History from ATO (wind in knots)
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Last 24hrSE85SE7
G17
SE9
G23
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G18
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G18
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G19
E12
G24
SE8
G19
SE5544E10
G18
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E5SE3CalmE5Calm--E8--
1 day agoSE75SE10
G17
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G15
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G27
S8
G18
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G17
SE76
G14
SE6S7SE534E5E4--SE5E8SE11
G19
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G22
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2 days ago46SE7SE9E6
G16
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G21
E10
G16
SE7
G15
SE8SE6SE7SE6E8
G19
SE7S56E8SE6E7
G15
E12
G25
E7
G14
SE9
G20
--SE7

Tide / Current Tables for Applegate Island, Prince William Sound, Alaska
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Applegate Island
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Fri -- 04:32 AM AKDT     Moonset
Fri -- 04:47 AM AKDT     Sunrise
Fri -- 05:27 AM AKDT     1.25 feet Low Tide
Fri -- 11:26 AM AKDT     9.66 feet High Tide
Fri -- 05:24 PM AKDT     1.35 feet Low Tide
Fri -- 05:46 PM AKDT     Moonrise
Fri -- 10:53 PM AKDT     Sunset
Fri -- 11:44 PM AKDT     11.90 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.89.374.52.41.41.42.54.46.68.59.59.58.56.74.52.51.41.62.95.17.71011.5

Tide / Current Tables for Culross Bay, Wells Passage, Prince William Sound, Alaska
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Culross Bay
Click for Map
Fri -- 04:32 AM AKDT     Moonset
Fri -- 04:46 AM AKDT     Sunrise
Fri -- 05:20 AM AKDT     1.25 feet Low Tide
Fri -- 11:12 AM AKDT     9.86 feet High Tide
Fri -- 05:17 PM AKDT     1.35 feet Low Tide
Fri -- 05:47 PM AKDT     Moonrise
Fri -- 10:54 PM AKDT     Sunset
Fri -- 11:30 PM AKDT     12.10 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.896.74.22.21.31.52.84.97.299.89.58.36.44.22.31.41.73.25.68.310.611.9

Weather Map and Satellite Images
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wmap_P
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 (14,3,4,5)
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Ground Weather Radar Station Middleton 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.