Monday, December11, 2017 L-36.com


Marine Weather and Tides
Onalaska, WA

Version 3.4
What's New / NOTES
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.
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.

Sunrise 7:45AMSunset 4:25PM Monday December 11, 2017 1:27 AM PST (09:27 UTC) Moonrise 12:53AMMoonset 1:26PM Illumination 45% Phase: Third Quarter Moon; Moon at 23 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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PZZ210 Columbia River Bar- 843 Pm Pst Sun Dec 10 2017
In the main channel..Combined seas 4 to 5 ft tonight and Mon. However, seas temporarily near 7 ft with the ebbs, which will occur around 1045 pm tonight and 1130 am Mon.
PZZ200 843 Pm Pst Sun Dec 10 2017
Synopsis for southern washington and northern oregon coast.. High pres will remain over the inland pac nw for next several days. A weak front will arrive later Mon night and Tue, but not much in way of impact expected. A stronger front will arrive later in the week, with gusty southerly winds at that time.

7 Day Forecast for Marine Location Near Onalaska, WA
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location: 46.51, -122.63     debug


Area Discussion for - Seattle, WA
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Fxus66 ksew 110533
afdsew
area forecast discussion
national weather service seattle wa
933 pm pst Sun dec 10 2017

Synopsis A strong upper ridge will maintain dry and stagnant
conditions across western washington through Wednesday. The ridge
will break down by Thursday with rain returning Thursday night
and Friday. Wet weather will continue through the weekend with
strong moist flow over the area.

Short term An upper ridge will be over the pacific northwest
tonight and Monday for dry weather. An upper short wave will move
over the top of the ridge Monday night, temporarily flattening
the ridge. An associated weak front will reach the coast Monday
night then dissipate Tuesday morning. The main affect from the
Monday night system will be to bring some high clouds to the area
but there might be some sprinkles near the coast. The upper ridge
will rebound over the area Tuesday and Wednesday.

There are less high clouds than last night which should allow some
fog to form over the interior lowlands tonight. High clouds with
the next weak weather system will probably limit fog Monday night
but that will depend on how thick they are. Tuesday night should
see a big more fog again with less clouds cover. Stagnant air will
continue through Wednesday. A decision on whether to extend the
current air stagnation advisory will be made Monday. Schneider

Long term It looks like Thursday will be our last dry day of
this stretch as the ridge will start to break down. We should see
rain returning by Thursday night or Friday as a trough moves in
from the west. The models have been waffling on the exact timing
of this system and it's now slightly slower compared to
yesterday's (faster) solutions. Moist west to northwest flow will
continue trough the weekend for more wet weather with snow in the
mountains. 33

Aviation A strong upper level ridge axis will persist over
eastern washington through Monday evening, but it will flatten
some on Monday. A dissipating front will brush the coast on Monday
night. Light southerly flow aloft through Monday morning, becoming
moderate southwest on Monday afternoon and Monday night. The air
mass will be dry and very stable. Shallow dense fog will be the
main forecast challenge through Monday morning over the puget
sound lowlands. It will mainly favor sheltered valleys. In
contrast, dry east wind off the cascades will minimize fog over
king county. Looking ahead to Monday night, conditions for fog
development will be less favorable due to thicker cirrus and a
little more mixing in the boundary layer.

Ksea... Fog may settle into the valleys and over the waters near
the terminal later tonight, but the airfield is most likely to be
above it all, causing sea to remain free from fog with the help
of a light but drying e-se breeze later tonight. Monday will
feature clear skies and light south wind. Monday night appears
unfavorable for fog development at sea due to thicker cirrus and
better dry air entrainment into the surface layer. Haner

Marine A 1042 mb high over eastern washington and lower
pres offshore will result in moderate offshore flow through Monday
evening. A dissipating front will brush the north coast on Monday
night, causing easterly gradients to weaken. Light northerly
offshore flow will prevail on Tue and wed. Expect a cold or
occluded front to move across the area late Thursday night or
early Friday. This will cause the flow to become onshore and
strengthen.

Hydrology River flooding is not expected for the next 7 days.

Sew watches warnings advisories
Wa... Air stagnation advisory until noon pst Monday for admiralty
inlet area-bellevue and vicinity-bremerton and vicinity-
east puget sound lowlands-eastern strait of juan de fuca-
everett and vicinity-hood canal area-seattle and vicinity-
southwest interior-tacoma area-western skagit county-
western whatcom county.

Pz... Small craft advisory until 9 pm pst Monday for coastal waters
from CAPE flattery to james island 10 to 60 nm-coastal
waters from james island to point grenville 10 to 60 nm-
coastal waters from point grenville to CAPE shoalwater 10
to 60 nm.

Small craft advisory until 3 pm pst Monday for coastal waters
from CAPE flattery to james island out 10 nm-west entrance
u.S. Waters strait of juan de fuca.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 33 mi40 min 44°F1027.9 hPa
TCNW1 - 9446484 - Tacoma, WA 54 mi46 min 30°F 49°F1027 hPa
TCMW1 - 9446482 - Tacoma Met, WA 54 mi40 min SE 4.1 G 4.1

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chehalis-Centralia Airport, WA22 mi33 minN 00.50 miFreezing Fog27°F26°F100%1027.1 hPa

Wind History from CLS (wind in knots)
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Last 24hrS64S5S4CalmN3CalmCalmCalmCalmCalmCalmCalmCalmCalmN3CalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmS55S3S4S7S7S7SE7SE7SE63CalmSW4CalmCalm4S4S66
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2 days agoCalmCalmCalmCalmCalmCalmCalmCalmNE3CalmCalmSE6S44CalmCalmCalmCalmCalmCalm6CalmCalmCalm

Tide / Current Tables for Longview, Washington - IGNORE HEIGHTS
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Longview
Click for MapNote: The Columbia River is subject to annual freshets. Short range predictions are available at local river forecast centers. The data for stations above Harrington Point apply only during low river stages. There is a tidal influence along most of the

Mon -- 12:54 AM PST     Moonrise
Mon -- 05:45 AM PST     1.33 feet Low Tide
Mon -- 07:44 AM PST     Sunrise
Mon -- 10:35 AM PST     8.66 feet High Tide
Mon -- 01:27 PM PST     Moonset
Mon -- 04:25 PM PST     Sunset
Mon -- 06:45 PM PST     2.29 feet Low Tide
Mon -- 10:48 PM PST     7.02 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
64.93.92.921.51.42.54.66.88.48.68.17.36.25.1432.42.33.456.57

Tide / Current Tables for Longview, Columbia River, Washington
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Longview
Click for Map
Mon -- 12:54 AM PST     Moonrise
Mon -- 04:45 AM PST     0.96 feet Low Tide
Mon -- 07:44 AM PST     Sunrise
Mon -- 10:02 AM PST     5.06 feet High Tide
Mon -- 01:27 PM PST     Moonset
Mon -- 04:25 PM PST     Sunset
Mon -- 05:29 PM PST     1.55 feet Low Tide
Mon -- 10:20 PM PST     4.19 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.22.72.11.61.111.52.53.74.75.14.84.33.732.521.61.62.12.93.74.24.1

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 Seattle, WA (4,6,7,8)
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Ground Weather Radar Station Portland, OR
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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.