Tuesday, May21, 2019 L-36.com


Marine Weather and Tides
Skamokawa Valley, WA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 5:30AMSunset 8:46PM Tuesday May 21, 2019 11:34 AM PDT (18:34 UTC) Moonrise 10:50PMMoonset 6:53AM Illumination 92% Phase: Waning Gibbous; Moon at 17 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- 840 Am Pdt Tue May 21 2019
.small craft advisory for rough columbia river bar in effect until 9 am pdt this morning...
In the main channel.. - general seas...6 to 8 feet through Wednesday morning. - first ebb...strong ebb occurred around 7 am this morning. Seas to 10 ft with breakers possible through 9 am. - second ebb...around 745 pm Tuesday. Seas to 10 ft. - third ebb...strong ebb around 745 am Wednesday. Seas to 10 feet with breakers likely.
PZZ200 840 Am Pdt Tue May 21 2019
Synopsis for the southern washington and northern oregon coast.. A low pressure center near cape blanco this morning will continue to weaken and slide southeast today. High pressure returns to the waters this evening and will hold through at least Friday.


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 211649
afdpqr
area forecast discussion
national weather service portland or
944 am pdt Tue may 21 2019

Synopsis Isolated showers will decrease in the north today.

Afternoon and evening showers and a few thunderstorms will develop
over the lane county cascades, central coast range of oregon and even
over the southern willamette valley. Onshore flow will bring low
clouds in to the willamette valley tonight and Wednesday.

Gradual warming is expected Wednesday and Thursday with the main
threat for showers over the cascades in the afternoons.

Short term Today through Thursday... Upper low off
newport or will drift slowly southeast today and tonight. As a result
there are two areas of light precipitation this morning. One is
associated with wrap around deformation to the north of the low over
southwest washington and extreme northern oregon. This is producing
very light stratiform precipitation and should weekend some during
the
day. The second area of precipitation this morning is over southwest
oregon associated with the instability near the upper low. In between
these areas is some cleaning that will allow some sunshine to filter
through this morning. Temperatures will be slightly below normal in
most areas due to the clouds. By this afternoon the models indicate
enough low level warming will occur to produce instability over the
southern half of our forecast area. The short range ensemble
thunderstorm probabilities get up into the 45% range over much of
lane county by mid afternoon. Showers should produce amounts of
0.10 to 0.35 inch with small hail possible. The steering winds are
out of the northeast for a rather unusual storm motion for our area.

Any storms that form should dissipate after sunset.

Upper low will move slowly southeast Wednesday and the shower threat
should end in most areas. But a few showers will persist over the
cascades. Schneider
remainder of previous discussion follows...

there will be little change in the pressure pattern Wednesday night
and Thursday and expect a cloudy start to the day on Thursday
followed by cascade showers in the afternoon. Daytime temperatures
will gradually warm Wednesday and Thursday. Mh ~tj

Long term Thursday night through Monday... Dry weather is expected
for Friday as the upper ridge asserts itself over the pacific nw. The
ridge is not very strong though as upper troughs moving over the
ridge will return a threat for showers for the weekend. The models
are showing these troughs to deepen and form an upper low over nw
oregon by Saturday for cooler conditions and periods of rain for
Saturday and Sunday. Drier weather is possible on Monday, but expect
showers over the cascades in the afternoon as the upper low moves
inland and increases the chance for diffluent flow aloft.~tj

Aviation GenerallyVFR across the forecast area as of 16z.

Surface low circulation just west of k6s2 at 16z. Shower activity
this morning focused on the south end of the forecast area,
mainly south of a konp to ksle line. ExpectVFR to be the primary
category through at least 08z wed. Models suggest the potential
for MVFR stratus to settle along the coast between 03z and 06z
due to northwest to north low-level flow. MVFR likely to spread
to the inland sites between 10z and 12z.

Kpdx and approaches...VFR at the terminal and vicinity as of 16z,
but there are some patches of sct010 clouds at the terminal. Not
likely to see this become an ifr cig.VFR to prevail through at
least 10z wed. Models hint at MVFR marine stratus developing at
the terminal and east to kttd around 10z. Weishaar

Marine Minimal changes to current forecast. Surface low was
located about 75 nm west of heceta head at 16z. East wind 15 kt
or less this morning. The low is expected to move inland near
cape blanco around 21z. The 12z model runs in good agreement
showing the wind backing to the north as the low tracks
southeast. Small craft advisory level speeds develop mid to late
afternoon. Strongest wind will be beyond 20 nm, with gusts to 30
kt likely this evening through wed. Small craft advisory
conditions likely to persist over the outer zones through wed.

Speeds expected to fall just below criteria for the inner zones
wed. This northerly wind pattern continues through at least fri,
with small craft advisory conditions to persist over the outer
zones.

Seas have risen to 10 to 12 ft this morning and will be in the 11
to 13 foot range today. Wave heights slowly ease to 10 to 11 ft
by this evening, but will hold at or near 10 ft tonight through
wed. Weishaar

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory for winds from 2 pm this afternoon to 9 am
pdt Wednesday for coastal waters from CAPE shoalwater wa
to florence or out 60 nm.

Small craft advisory for hazardous seas until 9 am pdt
Wednesday for coastal waters from CAPE shoalwater wa to
florence or out 60 nm.

Small craft advisory for rough columbia river bar until 9 am
pdt this morning.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ASTO3 - 9439040 - Astoria, OR 17 mi34 min N 6 G 8 54°F 58°F1006.1 hPa (+1.6)
LOPW1 - 9440422 - Longview, WA 29 mi34 min 56°F1006.4 hPa (+0.9)
46243 - Clatsop Spit, OR - 162 36 mi34 min 57°F10 ft
TOKW1 - 9440910 - Toke Point, WA 41 mi34 min NNE 4.1 G 7 55°F 58°F1007.4 hPa (+1.7)

Wind History for Astoria, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Astoria, Astoria Regional Airport, OR24 mi39 minNE 910.00 miOvercast57°F48°F72%1006.1 hPa

Wind History from AST (wind in knots)
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W6SE6NE3SE3E3CalmS3S3CalmCalmCalmCalmCalmCalmS4SW7SW7

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
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Tue -- 03:39 AM PDT     8.63 feet High Tide
Tue -- 05:35 AM PDT     Sunrise
Tue -- 07:53 AM PDT     Moonset
Tue -- 11:17 AM PDT     -0.90 feet Low Tide
Tue -- 05:15 PM PDT     7.05 feet High Tide
Tue -- 08:47 PM PDT     Sunset
Tue -- 11:07 PM PDT     2.35 feet Low Tide
Tue -- 11:50 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.55.47.28.48.67.96.44.62.71-0.2-0.9-0.60.72.64.66.276.864.83.72.82.4

Tide / Current Tables for Harrington Point, Columbia River, Washington
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Harrington Point
Click for Map
Tue -- 03:31 AM PDT     8.10 feet High Tide
Tue -- 05:35 AM PDT     Sunrise
Tue -- 07:53 AM PDT     Moonset
Tue -- 11:11 AM PDT     -1.25 feet Low Tide
Tue -- 05:07 PM PDT     6.47 feet High Tide
Tue -- 08:47 PM PDT     Sunset
Tue -- 11:01 PM PDT     2.54 feet Low Tide
Tue -- 11:50 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.65.47887.25.73.92.10.5-0.7-1.2-0.90.52.44.35.86.56.25.54.53.52.82.5

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 Portland, OR (14,3,4,5)
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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.