Thursday, May24, 2018 L-36.com


Marine Weather and Tides
Skamokawa Valley, WA

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 5:27AMSunset 8:50PM Thursday May 24, 2018 7:01 AM PDT (14:01 UTC) Moonrise 2:41PMMoonset 2:31AM Illumination 73% 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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PZZ210 Columbia River Bar- 226 Am Pdt Thu May 24 2018
In the main channel..Combined seas 6 ft today and tonight. However, seas will temporarily build to 8 ft during the ebbs around 145 pm this afternoon, 230 am tonight, and 245 pm Friday.
PZZ200 226 Am Pdt Thu May 24 2018
Synopsis for the southern washington and northern oregon coast.. High pressure over the northeast pacific and lower pressure over northern california will maintain northerly winds over the waters for much of the next week.

7 Day Forecast for Marine Location Near Skamokawa Valley, WA
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location: 46.27, -123.45     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 241018
afdpqr
area forecast discussion
national weather service portland or
310 am pdt Thu may 24 2018

Synopsis South to southwest flow aloft over the forecast will
bring some chance of thunderstorms this afternoon and evening mainly
for oregon cascades. Increasing southwest flow aloft and a
strengthening marine layer help to stabilize the north part of the
area. The whole trough pattern moves onshore Friday, maintaining the
deep marine layer and pushing the threat of thunder east of the
cascades. Onshore flow will continue Saturday, then a return to dry
and slightly above normal daytime temperatures can be expected
Sunday into early next week.

Short term Thursday through Saturday... Some instability that
brought thunderstorms to the cascades last evening remain over the
area early this morning. Satellite infrared loop show occasional
mid-level cells growing but not quite enough for thunderstorms, only
showers over the cascades and the coastal waters. Model show best
instability will remain over the oregon cascades today. The south
washington cascades should remain out of the threat area for
thunderstorms with more southwesterly mid and upper winds in that
area. By Friday the upper pattern bringing the instability will
have shifted east of the area. At best the cascade crest may have
thunderstorms develop Friday afternoon, but then quickly shift off
to the east.

The marine layer is fairly extensive, extending from the coast to the
interior lowlands. Tops of the marine clouds should be around 4000 to
5000 ft but there will be mid and upper clouds above that. We should
see some thinning of the clouds later this afternoon and evening
inland, but coastal areas should remain quite cloudy. Models suggest
some drizzle along the coast this morning as the upper trough
provides some lift on the marine layer. Onshore flow and marine
layer continues into Friday as the area remains under a weak trough
aloft. The models continue show some significant rains moving
northward Friday but most of this looks to be in central oregon.

Good onshore flow continue Friday night and Saturday as the whole
pattern shifts inland and eastward. The models show some drizzle or
light showers along the coast spreading inland along the columbia
river late Friday night and into Saturday. Mh weishaar tolleson

Long term Saturday night through Wednesday... The models are in
good agreement with a positive tilt upper ridge over the pacific
northwest Sunday in the wake of the system moving eastward from
Saturday, with the pattern continuing into Monday. The net result is
afternoon sunshine after areas of night and morning low clouds. Temps
will likely trend back toward or perhaps slightly above normal. The
models then show a weak trough moving through after that, the ecmwf
possibly getting it here late on memorial day and Tuesday with the
gfs focusing on Tuesday and Wednesday. This will increase the onshore
flow and marine layer again, with some spotty precipitation possible.

Tolleson

Aviation Onshore flow and marine air will bring widespread MVFR
cigs this morning over NW oregon. Areas ofVFR conditions will
persist inland this morning, while there is a chance for ifr
conditions with drizzle along the coast through 18z. ExpectVFR
conditions to return between 18z and 22z as clouds lift and break up
during the early afternoon.

Kpdx and approaches... MVFR CIGS this morning as marine clouds
continue to spread in from the sw. The MVFR CIGS are expected to
lift again toVFR category between 18z and 21z.

Marine High pressure over the northeast pacific and lower
pressure over northern california will maintain northerly winds
across the waters for much of the next week. As a result peak wind
gusts expected to continue from 10 to 20 kt through the weekend with
seas from 4 to 7 ft. Winds are likely to increase some in the early
to middle parts of next week, with winds gusting over 20 kt mon
through wed. Seas will steepen as a result of the local winds,
climbing into the 7 to 10 ft range.

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... None.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ASTO3 - 9439040 - Astoria, OR 17 mi43 min Calm G 1.9 54°F 60°F1017.2 hPa
LOPW1 - 9440422 - Longview, WA 29 mi43 min 58°F1017.3 hPa
46243 - Clatsop Spit, OR - 162 36 mi61 min 58°F5 ft
TOKW1 - 9440910 - Toke Point, WA 41 mi43 min WNW 6 G 7 54°F 58°F1017.4 hPa

Wind History for Astoria, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Astoria, Astoria Regional Airport, OR24 mi66 minW 48.00 miOvercast53°F53°F100%1016.9 hPa

Wind History from AST (wind in knots)
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Last 24hrNW9NW9NW7NW8NW7NW7W9W8NW10W8W9W6W7W6W4W3W6W6W4SW3CalmSW3SW4W4
1 day agoSE3CalmNW5NW7N8NW8N9NW11NW12NW11
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2 days agoN4CalmNW7N4N5N6N6N10NW14NW16NW13
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Tide / Current Tables for Skamokawa, Steamboat Slough, Washington - IGNORE HEIGHTS
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Skamokawa
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

Thu -- 03:31 AM PDT     Moonset
Thu -- 05:31 AM PDT     Sunrise
Thu -- 06:10 AM PDT     1.66 feet Low Tide
Thu -- 11:12 AM PDT     7.04 feet High Tide
Thu -- 03:41 PM PDT     Moonrise
Thu -- 06:17 PM PDT     0.91 feet Low Tide
Thu -- 08:50 PM PDT     Sunset
Thu -- 11:53 PM PDT     8.63 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.975.84.43.12.11.72.13.34.86.376.86.14.93.72.51.50.91.22.54.56.58.1

Tide / Current Tables for Cathlamet, Washington - IGNORE HEIGHTS
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Cathlamet
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

Thu -- 03:31 AM PDT     Moonset
Thu -- 05:31 AM PDT     Sunrise
Thu -- 06:39 AM PDT     1.66 feet Low Tide
Thu -- 11:31 AM PDT     7.04 feet High Tide
Thu -- 03:41 PM PDT     Moonrise
Thu -- 06:47 PM PDT     0.91 feet Low Tide
Thu -- 08:50 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.17.46.353.72.51.81.72.74.25.86.976.45.44.231.91.10.91.83.65.77.6

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 Portland, OR (10,2,3,4)
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Ground Weather Radar Station Portland, OR
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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.