Tuesday, October24, 2017 L-36.com

Marine Weather and Tides
Scappoose, 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 7:40AMSunset 6:10PM Tuesday October 24, 2017 4:09 AM PDT (11:09 UTC) Moonrise 11:13AMMoonset 8:39PM Illumination 18% Phase: Waxing Crescent; Moon at 4 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 Tue Oct 24 2017
.small craft advisory for rough columbia river bar in effect from 6 am to 10 am pdt this morning...
In the main channel..Combined seas 6 to 8 ft through tonight. However, seas will temporarily build to 10 ft during the ebb around 815 am this morning and to 9 ft during the ebb around 815 pm this evening.
PZZ200 250 Am Pdt Tue Oct 24 2017
Synopsis for southern washington and northern oregon coast.. Surface high pressure building over the waters will remain through most of the upcoming week. Meanwhile, a thermally induced surface trough will remain over the northern california and southern oregon coast, keeping persistent northerly winds over the coastal waters. A weak front will move through the waters Wednesday.

7 Day Forecast for Marine Location Near Scappoose, OR
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location: 45.7, -122.87     debug

Area Discussion for - Portland, OR
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Fxus66 kpqr 241023
area forecast discussion
national weather service portland or
324 am pdt Tue oct 24 2017

Synopsis Aside from a weak front bringing a chance for showers
Wednesday afternoon and evening, expect mainly dry weather and mild
temperatures across the region through most of the rest of the week.

Short term Today through Thursday..Surface analysis showed a
sharp thermal induced trough just off the oregon coast this morning.

Offshore gradients extended all the way across the cascades and
through the coast range, for breezy conditions through much of the
forecast area. Areas of fog were slowly developing in wind sheltered
valleys, mainly along the lower columbia and in the southern half of
the of the willamette valley. While these areas of fog and low
clouds may tend to be persistent again today under a strong
subsidence inversion, the smaller areal extent and continued drying
from the offshore flow both suggest an earlier burn off today. Mild
temps for those areas in sunshine today with the offshore flow,
including coastal strip where it looks like offshore flow will
persist through the entire day.

Modesl continue to indicate the shortwave out near 150w this morning
is expected to move across the upper ridge just offshore, and drop a
weak cold front southeast through the region wed. Time height cross
sections indicate decent moisture below 10k ft coincident with the
low level lift wed, in particular over the northern part of the
forecast area where level flow appear best ahead of the cold front.

Best chances for precipitation are likely to come in the afternoon
wed, followd by dwindling pops Wed evening.

The upper ridge quickly reasserts itself Wed night and thu, with
another inverted surface trough developing along the coast. This
suggests a quick return to sunny skies Thu for most areas along with
a rebound in temps back into the mid and upper 60s over inland
valleys. The exception of course will be wind protected valleys
similar to today and yesterday, where any fog and low clouds
development may be slow to clear.

Long term Thursday night through Sunday... No changes. Previous
discussion follows. High pressure will rebuild over the pac NW thu
and fri, and hold in place into next week. This will maintain mild
and dry conditions, as well as varying degrees of offshore flow.

Expect breezy east winds for Thu night through early sat, especially
over the higher terrain and in western columbia river gorge. In
fact, if current trend pans out, this would be a dry and mild
halloween, the first since 2007. rockey.

Aviation Offshore flow is keeping the coastVFR today. Inland
is a bit trickier. Offshore flow is evident at ttd and on weather
stations up in the cascades, but there is an opposing gradient
keeping winds light and variable around pdx and i-5 westward.

This means terminals west of ttd and south will continue to
bounce in and out of some drifting fog until the opposing
gradient breaks down and easterly winds make it into these
terminals. There is some uncertainty exactly when this will
happen, but the latest fog may break out would be 18z. Likely
won't see widespread fog, except perhaps in the south willamette
valley which will not see as much easterly flow. Beyond 18z, all
terminals should beVFR and remainVFR through tonight.

Kpdx and approaches... Will likely continue to see the terminal
bounce in and out of the fog going fromVFR to lifr conditions.

Easterly winds should make it into the terminal around 15-18z,
improving conditions toVFR.VFR conditions should continue
through the rest of today and tonight. Gusty east winds out
towards the gorge could affect easterly approaches through much
of Tuesday. -lm

Marine High pressure building over the NE pac will remain in
place through most of the next 7 days. Meanwhile, a thermally
induced surface low will remain over the northern ca and southern
or coast. This pattern will result in persist n-ne winds, gusty
at times. Pushed 25 kt winds back to Tuesday afternoon as latest
model runs and buoy observations show lighter winds tonight and
Tuesday morning. A weak front will move through the waters
Wednesday, which will briefly weaken the NE pacific high and turn
winds weak westerly. Gustier northerly winds will return for
later in the week.

Seas finally down to 8 to 9 ft this morning, so let the small
craft advisory for seas expire. Seas should continue to gradually
fall to around 6 ft by Wednesday, and stay in the 5 to 7 ft range
through Friday. -lm bowen

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory for winds from 2 pm this afternoon to 5 am
pdt Wednesday for 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 10 am
pdt this morning.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 28 mi52 min 55°F1034.5 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 56 mi52 min 54°F1031.8 hPa
ASTO3 - 9439040 - Astoria, OR 59 mi52 min N 2.9 G 6 53°F 57°F1033 hPa

Wind History for Longview, WA
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Scappoose Industrial Airpark, OR5 mi17 minW 36.00 miFog/Mist42°F42°F100%1033.1 hPa
Portland-Hillsboro Airport, OR12 mi17 minSSE 41.00 miFog/Mist42°F41°F96%1032.8 hPa
Pearson Airfield, WA12 mi17 minN 010.00 miFair44°F44°F100%1033.1 hPa
Portland, Portland International Airport, OR16 mi17 minN 06.00 miFog/Mist45°F45°F100%1033.2 hPa

Wind History from SPB (wind in knots)
Last 24hrCalmCalmCalmCalmCalmCalmSE3SE4CalmW4CalmCalmN3W3W5CalmNW3CalmW4W3N3CalmCalmW3
1 day agoW11
2 days agoSE12

Tide / Current Tables for Rocky Point, Multnomah Channel, Oregon
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Rocky Point
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Tue -- 05:15 AM PDT     0.43 feet Low Tide
Tue -- 07:40 AM PDT     Sunrise
Tue -- 09:51 AM PDT     1.80 feet High Tide
Tue -- 12:12 PM PDT     Moonrise
Tue -- 03:54 PM PDT     0.63 feet Low Tide
Tue -- 06:09 PM PDT     Sunset
Tue -- 09:04 PM PDT     2.95 feet High Tide
Tue -- 09:39 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Kelley Point, Oregon - IGNORE HEIGHTS
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Kelley Point
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

Tue -- 06:07 AM PDT     0.04 feet Low Tide
Tue -- 07:40 AM PDT     Sunrise
Tue -- 10:45 AM PDT     6.97 feet High Tide
Tue -- 12:11 PM PDT     Moonrise
Tue -- 06:01 PM PDT     2.83 feet Low Tide
Tue -- 06:09 PM PDT     Sunset
Tue -- 09:39 PM PDT     Moonset
Tue -- 09:48 PM PDT     8.02 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of PacificNorthwest    EDIT

Wind Forecast for Portland, OR (7,2,3,4)
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Ground Weather Radar Station Portland, OR
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weather_mapweather_map weather_map

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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.