Monday, December11, 2017 L-36.com


Marine Weather and Tides
Portland, 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 4:29PM Monday December 11, 2017 1:12 AM PST (09:12 UTC) Moonrise 12:54AMMoonset 1:27PM Illumination 46% Phase: Third Quarter Moon; Moon at 23 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- 843 Pm Pst Sun Dec 10 2017
In the main channel..Combined seas 4 to 5 ft tonight and Mon. However, seas temporarily near 7 ft with the ebbs, which will occur around 1045 pm tonight and 1130 am Mon.
PZZ200 843 Pm Pst Sun Dec 10 2017
Synopsis for southern washington and northern oregon coast.. High pres will remain over the inland pac nw for next several days. A weak front will arrive later Mon night and Tue, but not much in way of impact expected. A stronger front will arrive later in the week, with gusty southerly winds at that time.

7 Day Forecast for Marine Location Near Portland, OR
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location: 45.53, -122.68     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 110516
afdpqr
area forecast discussion
national weather service portland or
857 pm pst Sun dec 10 2017

Synopsis High pressure will continue to bring cool temperatures
and areas of morning fog and frost before a transition to a more
typical wet december pattern returns towards the weekend.

Short term Tonight through Wednesday... An upper ridge of high
pressure will bring few changes to the weather through midweek with
cool temperatures and areas of morning frost. A shortwave trough
passing by to our west and north Monday night will drag a
weak front into the waters off the pacific northwest coast and
perhaps squeeze out a few drops across our northern coastal zones.

Otherwise, surface high pressure should strengthen a bit over
western oregon in the wake of this system, which should reduce the
winds a bit across the columbia river gorge. However, it should
still be windy in locations like troutdale and corbett Tuesday and
Wednesday... Just not as windy as the past 24-72 hours. Neuman

Long term Wednesday night through Sunday... Ridging will keep us
dry into Thursday. Models have pushed back the onset of
precipitation to 10pm Thursday night at the earliest on the coast
and Friday morning in the willamette valley. This may help lower
the chance for freezing rain in the hood river valley. The later the
precip arrives in the morning, the less chance of freezing rain at
onset. This is still a time period to watch over the next few days.

Once rain starts, we get into more of a zonal flow pattern as the
ridge of high pressure gets squashed down by a longwave trough
digging into the gulf of alaska over the weekend. This means our
winter rains return. We may get a break in the precipitation on
Saturday before another system swings through on Sunday, but the
timing of this break is uncertain at this time.

Snow levels will be coming down to 3000 to 4000 ft behind this first
front Friday night, bringing snow to the resorts passes Friday night
into early Saturday morning. Snow levels lift back up to 6000-8000
ft for the onset of the next system on Sunday. -mccoy

Aviation No changes, as strong high pres remains east of the
cascades. This will maintain dry offshore flow, with gusty
easterly winds in and near the western columbia river gorge
tonight and mon. Air mass remains dry, so will see justVFR under
mostly clear skies tonight into mon. Stratus in the columbia
basin will remain jammed against the east slopes of the cascades,
and into the columbia gorge hood river valley. Also, like past
several nights, will see areas of ifr fog stratus form from
ks12 kcvo area southward through keug and krbg.

Pdx and approaches...VFR tonight and mon, with continue easterly
winds. Gradients big stronger tonight, so east winds may not
slacken until after 08z, with 5 to 10 kt from 10z to 16z, then
east winds pick up again. rockey.

Marine High pres over the inland pac nw, with lower pres well
offshore. This will maintain east to southeast winds on the
waters, with stronger winds over the far outer waters. Will also
have occasional gusts around 20 kt in the coastal terrain gaps.

Generally, seas running 5 to 7 ft tonight and mon, but a mix of
swell trains will keep periods bouncing between 12 and 16 sec.

Seas will build a bit more Mon night and tue, but look to stay in
the 8 to 10 ft range at this time.

A weakening front will produce bit more in way of souther winds
mon night. Could get gusts up to 25 kt at that time, but hard to
say as the front is weakening as it arrives. Strong front will
arrive later in the week, with higher potential of 25 to 30 kt
winds gusts.

Pqr watches warnings advisories
Or... Air stagnation advisory until 2 pm pst Thursday for central
willamette valley-lower columbia-south willamette valley.

Wa... Air stagnation advisory until 2 pm pst Thursday for greater
vancouver area-i-5 corridor in cowlitz county.

Pz... None.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 42 mi42 min 44°F1027.8 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 66 mi42 min 47°F1024.4 hPa
ASTO3 - 9439040 - Astoria, OR 74 mi42 min N 11 G 15 42°F 1024.3 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi19 minE 510.00 miFair37°F25°F62%1028.7 hPa
Portland, Portland International Airport, OR7 mi19 minESE 1510.00 miFair36°F25°F64%1028.5 hPa
Portland-Hillsboro Airport, OR14 mi19 minW 510.00 miFair26°F24°F92%1029 hPa
Portland, Portland-Troutdale Airport, OR15 mi19 minE 21 G 2910.00 miFair and Breezy37°F24°F59%1029.3 hPa
Scappoose Industrial Airpark, OR19 mi19 minSW 510.00 miFair29°F25°F85%1028.8 hPa
Aurora State Airport, OR20 mi19 minN 09.00 miFair27°F25°F92%1028.7 hPa

Wind History from PDX (wind in knots)
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Last 24hrSE9SE6NE3CalmCalmE7N3NW3NW4CalmE6E15E17
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1 day agoNW6N3NW3CalmN3CalmNW4CalmN3NE3E10E11SE11SE16SE16SE15SE13SE13SE13SE12E9E11SE9NE10
2 days agoSE10SE10SE7E9Calm3NE3E4SE104SE13SE15SE15SE12SE16SE11SE13SE14SE11SE7SE10SE7SE9Calm

Tide / Current Tables for Portland, Willamette River, Oregon - IGNORE HEIGHTS
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Portland
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 -- 12:08 AM PST     7.30 feet High Tide
Mon -- 12:53 AM PST     Moonrise
Mon -- 07:41 AM PST     Sunrise
Mon -- 09:08 AM PST     1.33 feet Low Tide
Mon -- 01:13 PM PST     8.66 feet High Tide
Mon -- 01:26 PM PST     Moonset
Mon -- 04:26 PM PST     Sunset
Mon -- 10:08 PM PST     2.29 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.37.26.65.84.93.932.21.61.32.14.57.18.68.587.26.25.14.13.22.62.33.1

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 -- 12:48 AM PST     7.30 feet High Tide
Mon -- 12:53 AM PST     Moonrise
Mon -- 07:41 AM PST     Sunrise
Mon -- 09:09 AM PST     1.33 feet Low Tide
Mon -- 01:26 PM PST     Moonset
Mon -- 01:53 PM PST     8.66 feet High Tide
Mon -- 04:26 PM PST     Sunset
Mon -- 10:09 PM PST     2.29 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.87.376.35.34.23.22.31.61.31.93.86.188.78.37.66.65.54.43.32.62.32.8

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 (4,6,7,8)
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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.