Saturday, July22, 2017 L-36.com


Marine Weather and Tides
Skamokawa Valley, 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 5:42AMSunset 8:54PM Saturday July 22, 2017 3:50 AM PDT (10:50 UTC) Moonrise 4:01AMMoonset 7:24PM Illumination 2% Phase: Waning Crescent; Moon at 28 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- 316 Am Pdt Sat Jul 22 2017
In the main channel..Combined seas 2 to 4 ft today, rising to 5 ft tonight. Seas temporarily build to 5 ft during the very strong ebb around 430 am this morning and to 6 ft during the weaker ebb around 5 pm this afternoon.
PZZ200 316 Am Pdt Sat Jul 22 2017
Synopsis for southern washington and northern oregon coast.. A weak frontal system is in the process of stalling and dissipating over the waters this morning. High pressure will strengthen over the ne pac later today through Sunday, with thermal low pres over sw or and nw ca. Gusty N winds and steep seas will result, lingering through at least early Mon.

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 221012
afdpqr
area forecast discussion
national weather service portland or
312 am pdt Sat jul 22 2017

Synopsis A flat upper ridge will bring warming to southwest
washington and northwest oregon Saturday that will continue into
early next week despite a system passing by to our north Sunday and a
weak low to our southwest Sunday through Tuesday. A weak warm front
moving onshore from the northwest will brush the far north coast with
some clouds and possibly some spotty light precipitation today. The
remnants of the cold front will move onshore tonight and may give us
some brief low clouds inland Sunday morning. The low to our
southwest will likely produce some thunderstorms in the lane county
cascade forecast zones Sunday through Tuesday before moving eastward.

Increased onshore flow and cooler temps are expected for the second
half of next week.

Short term Today through Monday... High pres anchored over the
interior western u.S. Will keep flat ridging over the pac NW through
the weekend and into early next week. Upper level heights will
fluctuate from day to day, but remain generally high over the region,
with temperatures above average through the period. Light onshore
flow will keep temps at the coast much cooler.

Most of SW wa and NW or remain cloud free this morning. However, a
low pres system approaching the b.C. Coast is bringing a weak warm
front toward the wa or coast, and associated clouds are pushing into
our far northern coastal zones. The main cloud cover will remain
confined to the coast today, and there is also potential for some
coastal drizzle or light rain through the morning hours. Otherwise,
expect a mostly sunny, and hot day across the cwa. 850 mb temps are
up 3-4 deg c from yesterday, which should support highs in the upper
80s to low 90s for the interior lowlands. Dew points will also be
increasing into the low 60s due to the weak frontal system, so it
will definitely feel on the muggy side this afternoon.

The low pres system to our north will move onshore tonight into
Sunday, bringing the remnants of a cold front onto the pac NW coast.

This may deepen the marine layer just enough to assist in bringing
some patchy clouds into the northern willamette valley during the
morning, but otherwise expect clouds to again be limited to the coast
to start the day. The trough also drops temps aloft by a couple of
degrees. So expect Sunday to be slightly cooler than today, but highs
should still make it into the mid to upper 80s for the interior
lowlands.

Upper level heights increase again on mon. If any marine stratus
clouds form overnight Sun into Mon morning, they should remain
limited to the coast. The latest MOS guidance is now suggesting that
mon will be at least as warm, if not a couple of degrees warmer, than
we see sat. So the interior lowlands have fcst highs into the low
90s, with a few mid 90s not out of the question.

A low pres system currently apparent on water vapor satellite near
36n 133w will slowly drift toward the northern calif coast this
weekend. The fcst models indicate that it will stall just offshore
later Sun and remain nearly stationary for the next couple of days.

The southerly flow aloft ahead of this system will bring some
instability and modest mid-level moisture into southern or, leading
to the potential for thunderstorm activity. The potential is highest
to the south of our cwa, but the threat does appear to extend into
the lane county cascades and foothills. The fcst carries a slight
chance for thunder in these zones from Sun afternoon through mon
night. Pyle

Long term Monday night through Friday... Models have started coming
into better agreement with the handling of the upper low spinning off
the california coast early next week. Both the ECMWF and GFS hold the
low offshore on Monday and start lifting it towards central oregon on
Tuesday which continues the thunder threat through Tuesday. However,
the low is also continuing to track further south each run which is
precluding any thunder threat further north along the cascades. In
addition, it is worth noting that the beginning stages of the upper
low cutting off can be seen on water vapor just inside 140w, but the
moisture appears quite limited. This lends support for moisture being
a limiting factor and the nature of the storms being high based and
somewhat dry (hence the fire weather concern).

Besides the thunder threat Monday and Tuesday along the central
oregon cascades, dry conditions will prevail with temperatures at or
slightly below normal.

The models suggest some degree of troughing along our coast during
the second half of next week though there are some differences
amongst the models. There should at least be some cooling back down
near normal. Tolleson

Aviation Clouds associated with a dissipating frontal system
are spreading down the coast from wa this morning, with MVFR cigs
at khqm and near-MVFR CIGS at kast. These clouds will probably
have a hard time making it south of ktmk, as the front stalls and
dissipates this morning. Otherwise,VFR and mostly clear skies
should prevail for most of the forecast area through this
evening, aside from some patchy morning fog in some of the more
wind-sheltered valleys.

Kpdx and approaches...VFR conditions through this evening. Winds
will be rather light this morning, then moderate onshore flow
will develop this afternoon and continue well into tonight.

Weagle

Marine Winds and seas will start to increase this afternoon
for what will be a fairly prolonged period of gusty N winds
tonight through at least Monday morning. A weak frontal system is
stalling and dissipating near the mouth of the columbia this
morning. This will allow high pressure to strengthen over the ne
pacific, while hot weather over SW oregon and NW california
strengthen a thermal trough of low pressure over those areas.

This will drive an increase N winds this afternoon, with gusts
25-30 kt expected across our southern waters by sunset and
spreading north into our northern waters overnight tonight. The
increasing N winds will result in steepening wind-driven seas
later this afternoon and into tonight. Winds continue to increase
Sunday, with some models suggesting gale force winds possible in
the southern waters. Gale force northerlies are pretty rare in
our waters, so considering the fact even the stronger models are
only showing marginal gales we opted to go with a small craft
advisory for both the winds and hazardous seas late this
afternoon evening through early Monday morning. SCA conditions
may very well continue longer than that, with the 00z GFS showing
gusty n-nw winds persisting through Tuesday. Eventually most
models bring an upper trough from the gulf of alaska closer to
our waters, which should eventually bring a decrease in
winds seas middle to late next week.

Although morning ebbs are very strong due to the new moon, there
remains very little swell available to produce rough columbia
river bar conditions. As winds increase off the pac NW waters
later today through tonight, we may need an SCA for rough bar
with Sunday morning's very strong ebb. Will hold off on
highlighting this for now, until we get a better idea what seas
will be at the columbia river buoy at ebb time tomorrow morning.

Weagle

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory from 8 pm this evening to 6 am pdt Monday
for coastal waters from CAPE shoalwater wa to cascade head
or out 60 nm.

Small craft advisory from 4 pm this afternoon to 6 am pdt
Monday for coastal waters from cascade head or to florence
or out 60 nm.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ASTO3 - 9439040 - Astoria, OR 17 mi51 min ESE 2.9 G 4.1 62°F 69°F1021.2 hPa (-0.3)
LOPW1 - 9440422 - Longview, WA 29 mi51 min 70°F1021.5 hPa (+0.0)
46243 - Clatsop Spit, OR - 162 36 mi51 min 58°F4 ft
46096 37 mi141 min SSE 5.8 G 7.8 57°F 61°F1021.7 hPa
TOKW1 - 9440910 - Toke Point, WA 41 mi51 min SSE 4.1 G 4.1 62°F 63°F1021.3 hPa (-0.4)

Wind History for Astoria, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Astoria, Astoria Regional Airport, OR24 mi56 minESE 310.00 miOvercast60°F55°F84%1021.3 hPa

Wind History from AST (wind in knots)
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Last 24hrSE3SE3SE3SE3SE3E3NE5W3W6SW7W9W8W8W7W5W7SW4W3W3CalmS3S3SE4SE3
1 day agoS5S6S5SE5S4SW5SW6W9S6SW7W11SW8SW9SW7W5W5W4W4CalmCalmS3SE3SE3SE3
2 days agoSE4SE3SE3SE3SE3Calm3N4N6N8NW9W7W7W7SW8SW9W9SW5SW5S4S3S3CalmS8

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

Sat -- 01:20 AM PDT     9.41 feet High Tide
Sat -- 05:01 AM PDT     Moonrise
Sat -- 05:44 AM PDT     Sunrise
Sat -- 09:20 AM PDT     -1.62 feet Low Tide
Sat -- 02:52 PM PDT     7.43 feet High Tide
Sat -- 08:23 PM PDT     Moonset
Sat -- 08:55 PM PDT     Sunset
Sat -- 09:09 PM PDT     2.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.39.39.28.26.54.42.40.6-0.8-1.6-1.30.32.65.16.97.46.95.94.63.42.522.54.2

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

Sat -- 01:39 AM PDT     9.41 feet High Tide
Sat -- 05:01 AM PDT     Moonrise
Sat -- 05:44 AM PDT     Sunrise
Sat -- 09:50 AM PDT     -1.62 feet Low Tide
Sat -- 03:11 PM PDT     7.43 feet High Tide
Sat -- 08:22 PM PDT     Moonset
Sat -- 08:55 PM PDT     Sunset
Sat -- 09:39 PM PDT     2.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.69.19.48.67.25.33.21.3-0.2-1.3-1.6-0.61.64.16.37.47.26.35.23.92.92.22.13.4

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 Portland, OR (6,6,7,8)
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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.