Monday, October23, 2017 L-36.com


Marine Weather and Tides
Cedar Mill, OR

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 7:38AMSunset 6:12PM Monday October 23, 2017 4:30 AM PDT (11:30 UTC) Moonrise 10:18AMMoonset 7:57PM Illumination 11% 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- 250 Am Pdt Mon Oct 23 2017
.small craft advisory for rough columbia river bar in effect through this evening...
In the main channel..Combined seas around 11 ft this morning will gradually fall to around 8 to 9 ft by this evening. However, seas will temporarily build to around 13 ft during the ebb around 730 am this morning and to 12 ft during the ebb around 745 pm this evening.
PZZ200 250 Am Pdt Mon Oct 23 2017
Synopsis for southern washington and northern oregon coast.. High pressure building over the waters holds through this week. A trough along the northern california coast will build north over the waters Tuesday, then retreat Wednesday as a weak cold front drops south across the waters. High pressure builds again late this week.

7 Day Forecast for Marine Location Near Cedar Mill, OR
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location: 45.58, -122.77     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 231015
afdpqr
area forecast discussion
national weather service portland or
315 am pdt Mon oct 23 2017

Synopsis Strong high pressure will generally prevail throughout
the upcoming week, resulting in mostly clear and mild conditions
outside of night and morning valley fog. A weak system passing by to
the north Wednesday will be the exception, bringing a few showers to
our northern zones before skies clear again by Thursday. East winds
will be gusty at times through the gorge, particularly Tuesday and
again late in the week.

Short term Today through Wednesday... Most of the smaller rivers
have crested this morning, with all rivers below flood stage and
expected to remain that way. The luckiamute near suver is still
rising, but is expected to crest below flood stage later this
morning. Slow rises are still expected on the lower portions of
larger rivers such as the willamette and tualatin, but these will
generally remain below bankfull and well below flood stage.

Locally dense fog is forming in the valleys this morning as mid and
high clouds clear out of the area. Fog appears most dense near the
rivers and in the coast range valleys per observations, spotter
reports, and area webcams. The fog and low clouds will probably be
slow to clear this morning, with weak flow under the building high
pressure system. Thermal low pressure is expected to strengthen near
brookings today, increasing the northerly flow a bit. This should
clear out the northern and central willamette valley around midday,
with low clouds likely lingering the longest around eugene as the
northerly flow stacks up the low level moisture against the south end
of the willamette valley. The air mass is warming up quickly as the
upper ridge strengthens, so temps today should be a few degrees above
normal with 60s fairly widespread across the forecast area.

Offshore flow is expected to increase through the columbia gorge
tonight and Tuesday, which should result in less fog across eastern
portions of the portland metro area. With 850 mb temps climbing into
the upper teens celsius, the foothills should easily reach the 70s
and perhaps approach 80 degrees Tuesday afternoon. With 500 mb
heights exceeding 590 dm, there will be inversions which will likely
keep the valleys a bit cooler.

The upper ridge flattens Tuesday night then a weak system drops
across the pacific northwest Wednesday and Wednesday night. This will
turn the flow onshore for more clouds, with some showers possible
later Wednesday and Wednesday night. Used a model blend for the
timing of the precipitation, but the trend is toward a bit later
arrival of any precipitation as compared to model runs from Saturday.

As a result, we may see some morning fog or low clouds again on
Wednesday morning before the weak system arrives. Weagle tolleson

Long term Wednesday night through Sunday... After the weak system
moves through Wednesday night, the upper ridge rebounds and rebuilds
strongly off the coast Thursday and spreads onshore Friday and
Saturday for more dry weather and some more offshore flow. The models
try to break down the upper ridge early next week but anything that
tries move through is weak at this point. Tolleson

Aviation High pressure building over the area today. Seeing a
mix of fog (with lifr conditions) and low stratus (with MVFR
ifr conditions) across the area, which will continue until around
18z when clouds start to really break up. Light offshore winds
should keep the coastVFR through tonight. After around 18z,
expectVFR conditions across the area through the rest of today.

Kpdx and approaches... Fog will keep lifr conditions at the
airport through much of this morning. Expect fog to start
breaking up around 18z, with improvement toVFR by 19z-20z.

-lm

Marine High pressure building in over the waters. An inverted
surface trough along the coast strengthens Monday night and
Tuesday, which will produce northerly wind gusts around 20-25 kt.

This will be short lived as a weak cold front drops south into
our waters on Wednesday, bringing northerlies around 20 kt behind
this feature. The inverted surface trough under high pressure
returns late in the week with 25 kt wind gusts possible again
Thursday and Friday.

Seas gradually falling today, dropping below 10 ft late this
evening. Seas continue to gradually fall to around 6 ft by
Wednesday, and stay around 5 to 7 ft through Friday. -lm

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory for hazardous seas until 11 pm pdt this
evening for coastal waters from CAPE shoalwater wa to
cascade head or out 10 nm-coastal waters from cascade head
to florence or out 10 nm-waters from CAPE shoalwater wa to
cascade head or from 10 to 60 nm-waters from cascade head
to florence or from 10 to 60 nm.

Small craft advisory for rough columbia river bar until 9 pm
pdt this evening.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 38 mi43 min 55°F1035.2 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 61 mi43 min 55°F1034 hPa
ASTO3 - 9439040 - Astoria, OR 68 mi43 min S 1.9 G 5.1 52°F 56°F1033.8 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi38 minWNW 30.50 miFog51°F51°F100%1034.8 hPa
Portland, Portland International Airport, OR9 mi38 minN 00.25 miFog50°F50°F100%1035 hPa
Portland-Hillsboro Airport, OR10 mi38 minN 00.25 miFog42°F39°F92%1034.6 hPa
Scappoose Industrial Airpark, OR14 mi38 minN 00.50 miFog47°F46°F100%1034.8 hPa
Portland, Portland-Troutdale Airport, OR20 mi38 minN 08.00 miMostly Cloudy48°F45°F89%1034.8 hPa
Aurora State Airport, OR23 mi38 minNE 30.50 miFog48°F48°F100%1034.7 hPa

Wind History from VUO (wind in knots)
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Last 24hrW6E3CalmS4S534S5S7
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1 day agoSE7E13
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2 days ago4SE4364S8S7S10
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SW8W5NW4Calm335S5SE66SE6SE5SE7S9

Tide / Current Tables for St. Johns, Willamette River, Oregon - IGNORE HEIGHTS
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St. Johns
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 -- 05:42 AM PDT     -0.20 feet Low Tide
Mon -- 07:38 AM PDT     Sunrise
Mon -- 09:43 AM PDT     7.25 feet High Tide
Mon -- 11:17 AM PDT     Moonrise
Mon -- 05:34 PM PDT     2.42 feet Low Tide
Mon -- 06:11 PM PDT     Sunset
Mon -- 08:56 PM PDT     Moonset
Mon -- 08:59 PM PDT     8.29 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.542.61.40.5-0.1-0.11.74.56.77.26.96.25.34.33.52.92.52.64.67.28.387.3

Tide / Current Tables for Vancouver, Washington - IGNORE HEIGHTS
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Vancouver
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 -- 05:54 AM PDT     -0.20 feet Low Tide
Mon -- 07:38 AM PDT     Sunrise
Mon -- 10:20 AM PDT     7.25 feet High Tide
Mon -- 11:17 AM PDT     Moonrise
Mon -- 05:46 PM PDT     2.42 feet Low Tide
Mon -- 06:10 PM PDT     Sunset
Mon -- 08:56 PM PDT     Moonset
Mon -- 09:36 PM PDT     8.29 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.24.73.21.80.70-0.20.93.45.87.27.16.65.74.73.832.52.53.86.288.37.8

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 (7,2,3,4)
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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.