Wednesday, October18, 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 7:31AMSunset 6:19PM Wednesday October 18, 2017 4:59 PM PDT (23:59 UTC) Moonrise 5:10AMMoonset 5:17PM Illumination 2% Phase: Waning Crescent; Moon at 28 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- 222 Pm Pdt Wed Oct 18 2017
.small craft advisory for rough columbia river bar in effect through Thursday afternoon...
In the main channel..Combined seas 10 ft this evening building to 18 ft Thu. However, seas will temporarily build to around 15 ft with breakers likely during the strong ebb around 445 pm this afternoon, and to 13 feet with breakers possible with the ebb around 5 am late tonight.
PZZ200 222 Pm Pdt Wed Oct 18 2017
Synopsis for southern washington and northern oregon coast.. Gales tonight ahead of a cold front moving se across the coastal waters tonight. A trough of low pres will linger over the waters Thu, then a weak ridge of high pres builds in Fri. A west swell arriving Thu brings seas to 20 to 22 ft from Thu afternoon into Fri morning. Another strong frontal system arrives Fri night and Sat.

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 182203
afdpqr
area forecast discussion
national weather service portland or
254 pm pdt Wed oct 18 2017

Synopsis A series of storm systems will bring periods of valley
rain that may be heavy at times, mountain snow and coastal winds
through the weekend.

Short term Today through Saturday... Water vapor satellite imagery
reveals a large shortwave trough moving eastward towards the pacific
northwest. A warm front lifted northeastward across the region this
morning and led to widespread light rain to the north of a line
extending between pacific city and hood river. An atmospheric river
streaming northeastward ahead of a cold front is currently taking
aim at western washington. Rainfall rates are generally peaking
between 0.35-0.50" per hour across the olympic peninsula. This
atmospheric river will gradually shift southeastward into southwest
washington and northwest oregon tonight and early Thursday. As the
upper level trough slides south of the region, this front will
become oriented a little more north-south and weaken over the next
24 hours. This should result in hourly rainfall rates decreasing
with time as it drops southeastward across the region. As a result,
few flooding issues exist in the short term although we will
certainly need to watch rainfall rates over the burn scars.

Meanwhile, southerly winds have pushed onto our coast this
afternoon. So far, winds have remained in check, but these should
increase over the next couple of hours and at least flirt with high
wind warning criteria. Despite this being a somewhat marginal event,
will keep headlines intact, particularly given it's the first real
wind of the season along the coast.

A colder and more unstable airmass will spread into the region late
Thursday afternoon and evening. This should turn precipitation more
showery with a few thunderstorms possible over the coastal waters
Thursday night. Models are hinting that a weak surface low could
develop over the far northeast pacific Thursday night, which could
create a wind field a little more conducive to rotating storms than
current model output suggests so this will be worth monitoring. In
addition, snow levels will lower to near the cascade passes by late
Thursday night and Friday as colder air aloft filters into the
region. Moderately strong onshore flow coupled with the unstable
atmosphere should produce some decent snow accumulations in the
cascades above 4-5kft Friday with travel impacts certainly possible
at pass level, particularly at santiam and willamette passes.

Any break in the wet weather will be short lived Friday night as
models are in good agreement the next warm front will spread light
to moderate rain into northwest oregon and southwest washington by
late Friday night with rain continuing for much of the day Saturday.

Subtle, but significant model differences exist in exactly on how
long and where an atmospheric river will then take aim at the
region, but it has the potential to bring hydrologic issues. Neuman

Long term Saturday night through Wednesday... .Strong moist zonal
flow will set up over the region Saturday night through Sunday. Snow
levels will rise above 8,000 feet. Still some uncertainty as to
whether or not the heaviest rain will set up over western oregon or
western washington. Have kept pops high, but forecast details such
as amount, intensity, and duration are unclear.

Expect to see some rises on area rivers, especially in the coastal
basins, and if the heavy rain sets up over urban areas, some
localized urban flooding issues could develop. Also, locations with
significant burn scars should be aware of possible flash
flooding and debris flows.

Models are suggesting, short wave ridging will develop over the
pacific NW early next week, which should bring at least a day or two
of dry weather. The euro model suggests a weak front could push into
the region during the middle of next week while the GFS remains dry
and mild. Given the uncertainty, have trended pops towards
climatology. Bishop

Aviation Generally a mix ofVFR and MVFR conditions over the
interior this afternoon and evening, expected to go to predominantly
MVFR conditions later tonight after 07z as a cold front pushes rain
inland. MVFR conditions appear to be the most likely flight category
over the interior TAF sites through the day thu. Along the coast
expect MVFR, and locally ifr conditions to continue tonight. As a
cold front moves onshore thu, improvement toVFR category expected
along the north oregon coast after 12z, while further south MVFR to
ifr conditions are expected to persist through most of the day.

Kpdx and approaches... MainlyVFR conditions through 08z tonight,
although there is a chance for seeing some MVFR CIGS anytime before
08z. After 08z expect MVFR conditions to become predominant as ran
associated with a cold front moves in.

Marine Southerly gales continue this evening ahead of a cold
front that is expected to move SE across the waters tonight. The
front is expected to reach the vicinity of CAPE disappointment
around 10 pm tonight, and newport around 6 am thu. There is a likely
to be a coastal jet influence ahead of the front, where winds are
expected to gust as high as 45 kt within about 10 nm of the coast
ahead of the front. Seas will build in response to the local winds,
peaking on the order of 16 ft tonight.

Winds will likely drop into range of 15 to 25 kt behind the front,
which should allow seas to drop a few feet early Thu morning. A
large long period swell will arrive later in the day Thu from the
west. The swell will peak between 20 and 23 ft Thu evening, then
slowly subside Fri and Fri night. These wave heights coupled with
the long period, will necessitate a high surf from Thu afternoon
through Fri morning. Another storm system capable of producing at
least gale force wind gusts appears on track for Friday night and
Saturday.

Pqr watches warnings advisories
Or... High wind warning until 11 pm pdt this evening for coast range
of northwest oregon-north oregon coast.

High surf advisory from 1 pm Thursday to 10 am pdt Friday for
central oregon coast-north oregon coast.

Wa... High wind warning until 11 pm pdt this evening for south
washington coast-willapa hills.

High surf advisory from 1 pm Thursday to 10 am pdt Friday for
south washington coast.

Pz... Gale warning until 11 pm pdt this evening for coastal waters
from CAPE shoalwater wa to cascade head or out 10 nm-
waters from CAPE shoalwater wa to cascade head or from 10
to 60 nm.

Gale warning until 5 am pdt Thursday for coastal waters from
cascade head to florence or out 10 nm-waters from cascade
head to florence or from 10 to 60 nm.

Small craft advisory for rough columbia river bar until 6 pm
pdt Thursday.

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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 57°F1008.2 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 66 mi42 min 53°F1010.6 hPa
ASTO3 - 9439040 - Astoria, OR 74 mi42 min S 19 G 31 60°F 57°F1006.3 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi67 minSE 5 G 1510.00 miOvercast64°F55°F75%1010.1 hPa
Portland, Portland International Airport, OR7 mi67 minS 1110.00 miOvercast64°F55°F73%1010.4 hPa
Portland-Hillsboro Airport, OR14 mi67 minS 1110.00 miMostly Cloudy64°F55°F75%1009.7 hPa
Portland, Portland-Troutdale Airport, OR15 mi67 minno data10.00 miOvercast63°F55°F76%1010.6 hPa
Scappoose Industrial Airpark, OR19 mi67 minSSE 1010.00 miOvercast62°F55°F80%1009.1 hPa
Aurora State Airport, OR20 mi67 minSSW 9 G 1610.00 miA Few Clouds65°F55°F73%1010.6 hPa

Wind History from PDX (wind in knots)
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Last 24hrW4CalmCalmCalmE3CalmCalmCalmCalmW4NW3CalmE8SE5SE8SE10E12E12S11S9SE8S6S11S10
1 day agoCalmW4W3W3W3E3CalmCalmSE3CalmSE4CalmCalmS3CalmS6SE6S6SE6SW9NW6NW4N3NW5
2 days agoW3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSW3CalmCalmCalmN333N3NE4NW3

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

Wed -- 02:33 AM PDT     0.40 feet Low Tide
Wed -- 06:00 AM PDT     8.00 feet High Tide
Wed -- 06:10 AM PDT     Moonrise
Wed -- 07:31 AM PDT     Sunrise
Wed -- 02:46 PM PDT     0.39 feet Low Tide
Wed -- 06:16 PM PDT     Moonset
Wed -- 06:19 PM PDT     Sunset
Wed -- 06:22 PM PDT     8.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.11.10.50.73.26.487.775.94.73.42.21.20.60.52.66.18.68.78.175.64.2

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

Wed -- 02:34 AM PDT     0.40 feet Low Tide
Wed -- 06:10 AM PDT     Moonrise
Wed -- 06:40 AM PDT     8.00 feet High Tide
Wed -- 07:31 AM PDT     Sunrise
Wed -- 02:47 PM PDT     0.39 feet Low Tide
Wed -- 06:16 PM PDT     Moonset
Wed -- 06:19 PM PDT     Sunset
Wed -- 07:02 PM PDT     8.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.41.20.50.62.55.27.587.56.55.23.92.51.40.60.424.87.68.88.57.66.24.7

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 (19,4,5,8)
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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.