Monday, April23, 2018 L-36.com


Marine Weather and Tides
Cathlamet, WA

Version 3.4
What's New / NOTES
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.
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.

Sunrise 6:07AMSunset 8:12PM Monday April 23, 2018 4:07 PM PDT (23:07 UTC) Moonrise 12:08PMMoonset 2:14AM Illumination 62% Phase: Waxing Gibbous; Moon at 9 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- 213 Pm Pdt Mon Apr 23 2018
In the main channel..Combined seas 2 to 4 ft tonight and Tuesday. However, seas will temporarily build to near 5 ft during the ebb around 1245 am Tuesday and to 6 ft during the ebbs around 115 pm Tuesday and 2 am Wednesday morning.
PZZ200 213 Pm Pdt Mon Apr 23 2018
Synopsis for southern washington and northern oregon coast.. Thermal low pressure along the coast will shift over the waters tonight. Northerly winds will veer northeasterly this evening and then easterly by Tuesday. Winds will be especially gusty west of the river gaps in the coast range. Low pressure moving north mid-week will bring a southerly wind reversal, possible gusty winds and fog/low clouds.

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 232057
afdpqr
area forecast discussion
national weather service portland or
200 pm pdt Mon apr 23 2018

Synopsis High pressure over the region will bring lots of
sun and warm temps to much of the region through mid week. Cooling
along the coast begins wed, and spreads inland Thu and fri. An upper
level low approaching the north ca coast late in the week will
spread a chance for showers and maybe even a few thunderstorms to
the reigon late Thu and Thu night. Low pres will stick around
through the weekend keeping chances for showers going along with
seasonably cool temps.

Short term Tonight through Thursday... An upper level ridge seen
in water vapor pictures Mon afternoon along 130w, will move inland
over the pacific NW tonight, then linger through wed. With a thermal
induced trough along the coast, most inland areas will see an
offshore flow that will help to keep skies mostly clear through wed.

Models indicating 850 mb temps continue to warm Tue and wed, reacing
close to 15c by wed, which should be good for highs into the lower
80s inland valleys, and which may also challenge some of our high
temp records. Along the coast onshore flow appears likely to develop
late tue, then again Wed as the surface trough begins to shift
onshore. The turn to onshore flow, earliest along the central or
coast, will cut off the diurnal temp rise along the coast earlier
each day.

By Thu models develop a sse flow over the region as a large upper
level low approaches the north ca coast. As the upper heights begin
to come down and the surface trough moves inland, a developing
onshore flow will begin to bring temps down over the interior as
early as thu, although some areas may not see much cooling thu. The
se flow and some diffluence aloft may begin to destabilize the
atmosphere enough Thu afternoon to introduce a slight chance for
thunderstorms to the lane county cascades.

Long term Thursday night through Monday... While models agree on
the upper low off the north ca and south or coast eventually moving
inland, models diverge some on how quickly that happens, and what
happens afterwards at the end of the weekend. As the low level flow
likely remains onshore through the extended period, the differing
models wind up yielding nearly the same forecast; a chance for
showers each day with temps near seasonal normals.

Aviation Vfr conditions expected tonight and Tuesday.

Offshore flow will continue through early Tuesday before easing
Tuesday afternoon.

Kpdx and approaches...VFR conditions through Tuesday. Fairly
strong easterly wind gusts of 20-30 kt will continue through
18z-20z Tuesday, then ease off.

Marine Surface thermal trough along the coast will drift
offshore tonight. This will result in winds becoming increasingly
offshore with wind gusts of 15 to 20 kts. Some isolated gusts
near 25 kts possible downwind of the coastal river gaps
including the mouth of the columbia river tonight.

A longer period westerly swell arrives later tonight into
Tuesday, but wave heights remain below 10 ft. During the latter
half of the week, a southerly wind reversal may develop along the
coast bringing some fog and low clouds. Seas likely will remain
below 10 ft. Small craft advisory level winds could return
towards the weekend, as a front moves into the north oregon and
south washington waters. Tw

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 21 mi50 min N 9.9 G 15 69°F 53°F1021.9 hPa
LOPW1 - 9440422 - Longview, WA 23 mi50 min 51°F1022.2 hPa
46243 - Clatsop Spit, OR - 162 40 mi68 min 52°F4 ft
TOKW1 - 9440910 - Toke Point, WA 47 mi50 min ENE 8 G 12 56°F1023.3 hPa

Wind History for Astoria, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Southwest Washington Regional Airport, WA26 mi72 minWSW 410.00 miFair73°F35°F25%1023.1 hPa

Wind History from KLS (wind in knots)
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Last 24hrN11NW9N9NW5CalmN5N4W3CalmCalmCalmCalmCalmCalmCalmCalmN5N75NW6NW54W4SW3
1 day agoW6NW7W7W8W4CalmCalmCalmCalmCalmCalmNW3NW3N3N3NW6N8N7N9
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2 days agoCalmNW4NW5NW4CalmCalmE3CalmCalmCalmS44CalmW4NE3N3N46W10W5W5W8W7NW9

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

Mon -- 03:14 AM PDT     Moonset
Mon -- 04:17 AM PDT     3.19 feet Low Tide
Mon -- 06:12 AM PDT     Sunrise
Mon -- 09:02 AM PDT     7.72 feet High Tide
Mon -- 01:08 PM PDT     Moonrise
Mon -- 05:18 PM PDT     0.31 feet Low Tide
Mon -- 08:11 PM PDT     Sunset
Mon -- 10:58 PM PDT     7.23 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.954.23.53.23.44.66.17.27.77.56.75.54.12.81.60.80.30.61.83.55.36.77.2

Tide / Current Tables for Skamokawa, Steamboat Slough, Columbia River, Washington
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Skamokawa
Click for Map
Mon -- 03:03 AM PDT     2.58 feet Low Tide
Mon -- 03:14 AM PDT     Moonset
Mon -- 06:12 AM PDT     Sunrise
Mon -- 08:29 AM PDT     7.23 feet High Tide
Mon -- 01:08 PM PDT     Moonrise
Mon -- 04:29 PM PDT     0.41 feet Low Tide
Mon -- 08:12 PM PDT     Sunset
Mon -- 10:20 PM PDT     6.60 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.53.52.92.62.93.85.36.57.17.16.45.34.1321.10.50.51.42.94.55.86.66.4

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 (19,4,5,8)
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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.