Wednesday, July26, 2017 L-36.com


Marine Weather and Tides
Cathlamet, 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 5:45AMSunset 8:50PM Tuesday July 25, 2017 9:35 PM PDT (04:35 UTC) Moonrise 7:34AMMoonset 9:26PM Illumination 7% Phase: Waxing Crescent; Moon at 3 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- 859 Pm Pdt Tue Jul 25 2017
In the main channel..Combined seas will be around 4 ft through Wed afternoon. However, seas will temporarily build to 7 ft with breakers possible during the strong ebb around 730 am Wednesday morning and to 5 ft during the ebb around 815 pm Wednesday evening.
PZZ200 859 Pm Pdt Tue Jul 25 2017
Synopsis for southern washington and northern oregon coast.. High pressure will continue over the ne pacific through the end of the week. A thermal trough will remain along the southern oregon coast for the next few days. The thermal trough strengthens over the weekend.

7 Day Forecast for Marine Location Near Cathlamet, WA
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location: 46.2, -123.38     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 252104
afdpqr
area forecast discussion
national weather service portland or
204 pm pdt Tue jul 25 2017

Synopsis An upper low over north california will slowly move
inland tonight and Wednesday providing a slight chance of
thunderstorms for the oregon cascades. Marine clouds will
fill in along the coast this evening and move into the north
willamette valley Wednesday morning. The marine clouds will move
further inland Wednesday and Thursday nights. Inland clearing is
expected each afternoon.

Short term Tonight through Friday... An upper low over northern
california will slowly move across NW california through Wednesday
providing a slight chance for thunderstorms for the lane county
cascades. Some cumulus clouds are starting to sprout over the
cascades south and east of lane county early this afternoon. Chances
are not high that thunderstorms will grow over lane county this
afternoon, but the chance is too high to not continue a mention in
the forecast.

Satellite imagery shows extensive marine clouds well offshore that
should move into the portland coastal waters this evening for clouds
returning to the coast tonight. Light northwest winds should move
these clouds through the lower columbia river valley into parts of
the north willamette valley (including the portland metro area)
Wednesday morning. Additionally, stratus may form over the sw
washington and NW oregon cascade foothills, and expand into parts of
the central willamette valley.

The inland clouds will clear early Wednesday afternoon, but the
reduction in hours of solar heating due to the morning clouds will
result in slightly cooler afternoon temperatures. Inland temperatures
will peak in the mid 80s Wednesday afternoon with areas along the
lower columbia river including scapoose and kelso peaking in the
upper 70s to low 80s.

Models have slowed the progress of the upper low moving inland, such
that the steering flow continues to be more southerly Wednesday
afternoon. This means the slight chance for thunderstorms continues
for the oregon cascades, and was added to the oregon cascade forecast
for Wednesday afternoon. The biggest threat, which is not very big,
is along the cascade crest. With the upper low slightly further north
than it will be this afternoon have extended the slight chance of
thunderstorms north of lane county to include the mount jefferson
area.

The upper low moves east of the cascades Wednesday night, and an
upper level shortwave trough approaches from the northwest. This will
increase onshore winds and favor marine clouds returning to the coast
Wednesday evening. A deeper marine layer will allow the marine clouds
to move further inland early Thursday morning. Expect the entire
willamette valley and cascade foothills to have cloudy or mostly
cloudy skies Thursday morning. The clouds will clear in the
afternoon, but not as quick as the previous day, and the afternoon
temperatures will be noticeably cooler (low 80s).

The upper level heights rise slightly Thursday night and Friday. Some
marine clouds will move inland Friday morning, but do not expect as
deep of a push as Thursday morning. This will allow for earlier
clearing Friday afternoon and slightly warmer temperatures. ~tj

Long term Friday night through Monday... An upper level ridge
builds over the pacific NW Friday night through Monday as a couple of
upper lows deepen over the NE pacific. The first low moves north of
canada Sunday with the second low moving into the pacific on Monday.

This will result in continued onshore flow, minimal inland stratus,
and slightly warmer temperatures. ~tj

Aviation Vfr across the region early this afternoon. Ifr to
low-end MVFR CIGS return to the central oregon coast by 03z wed
and to the north oregon and south washington coast between 03z
and 06z wed. Models suggest a deeper inland stratus penetration
late tonight and Wed morning, likely pushing up the columbia
river to kkls around 09z and portions of the willamette valley
east of interstate 5 near sunrise.

There is also the potential for TCU or CB to drift over lane
county cascades through the evening hours. Cannot rule out a
threat of thunderstorms for the central cascades, but the
probability is low.

Kpdx and approaches...VFR with thin cirrus through at least 12z
wed. Latest model guidance shows stratus reaching the terminal
and vicinity around 12z. Weishaar

Marine Wind over the outer waters, generally beyond 30 nm,
will continue to gust to about 25 kt through late tonight.

Current small craft advisories look good. Wind over pzz250 slow
to develop, but will maintain the small craft advisory for wind.

Several models, including those of higher resolution, show
decreased wind speeds wed. The GFS has 20-25 kt boundary layer
wind speeds over the far south end of pzz255 and pzz275 wed
afternoon. Several other models are not as strong so will keep
the forecast below small craft wind advisory thresholds. The low-
level flow becomes more nwly the latter half of the week, which
will keep wind speeds below 20 kt. Thermal low pres along the
south oregon coast strengthens over the weekend, for potential
small craft advisory wind speeds over the south waters.

Highest wave heights, pre-dominantly wind-wave driven, will
be through tonight. Overall wave heights ease Wed with a
reduction in the wind- wave component. Seas 5 ft or less can be
expected Fri and sat, then come up a bit Sun as wind speeds
strengthen. Weishaar

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory until midnight pdt tonight for waters from
cape shoalwater wa to cascade head or from 10 to 60 nm.

Small craft advisory for winds until midnight pdt tonight for
coastal waters from CAPE shoalwater wa to cascade head or
out 10 nm.

Small craft advisory until 2 am pdt Wednesday for waters from
cascade head to florence or from 10 to 60 nm.

Small craft advisory until 2 am pdt Wednesday for coastal
waters from cascade head to florence or out 10 nm.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ASTO3 - 9439040 - Astoria, OR 21 mi48 min NNW 4.1 G 5.1 63°F 71°F1017.4 hPa
LOPW1 - 9440422 - Longview, WA 23 mi48 min 71°F1015.4 hPa
46096 40 mi126 min NNW 19 G 21 51°F 54°F1018.9 hPa
46243 - Clatsop Spit, OR - 162 40 mi36 min 53°F5 ft
TOKW1 - 9440910 - Toke Point, WA 47 mi48 min NW 9.9 G 14 58°F 64°F1018.1 hPa

Wind History for Astoria, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Southwest Washington Regional Airport, WA26 mi40 minWNW 710.00 miFair70°F57°F64%1016.2 hPa

Wind History from KLS (wind in knots)
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Last 24hrNW4NW7NW3NE3CalmN3N3N4N4N55NW56NW5W6W6W10--W10
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1 day agoNW64N3N3N3N3N5N4N4CalmN6NW8NW12
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2 days ago6NW53NW5NW4NW7NW6NW9NW6NW64NW7NW8W84W10
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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

Wed -- 12:18 AM PDT     1.48 feet Low Tide
Wed -- 05:06 AM PDT     8.64 feet High Tide
Wed -- 05:48 AM PDT     Sunrise
Wed -- 09:43 AM PDT     Moonrise
Wed -- 12:52 PM PDT     -1.05 feet Low Tide
Wed -- 06:14 PM PDT     8.10 feet High Tide
Wed -- 08:50 PM PDT     Sunset
Wed -- 10:56 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.51.93.65.97.88.68.37.25.53.71.80.3-0.7-1-02.24.878.17.975.74.22.9

Tide / Current Tables for Skamokawa, Steamboat Slough, Columbia River, Washington
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Skamokawa
Click for Map
Wed -- 04:34 AM PDT     8.07 feet High Tide
Wed -- 05:48 AM PDT     Sunrise
Wed -- 09:43 AM PDT     Moonrise
Wed -- 11:56 AM PDT     -0.51 feet Low Tide
Wed -- 05:37 PM PDT     7.49 feet High Tide
Wed -- 08:51 PM PDT     Sunset
Wed -- 10:56 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.7356.87.987.15.64.12.61.1-0-0.50.224.26.17.37.46.75.54.12.81.8

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 (0,6,7,8)
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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.