Wednesday, August16, 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 6:12AMSunset 8:16PM Wednesday August 16, 2017 8:24 AM PDT (15:24 UTC) Moonrise 12:00AMMoonset 3:03PM Illumination 31% Phase: Waning Crescent; Moon at 24 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- 205 Am Pdt Wed Aug 16 2017
In the main channel..Combined seas 4 to 5 ft today, building to 6 to 7 ft tonight. However, seas will temporarily build to near 6 ft during the ebb around 1230 pm this afternoon, and to near 8 ft during the ebb around 115 am tonight.
PZZ200 205 Am Pdt Wed Aug 16 2017
Synopsis for southern washington and northern oregon coast.. High pres will persist over the coastal waters through the week. Thermal low pres over N ca/s or will keep northerly winds in place, with breezy afternoon/evening winds possible.

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 161002
afdpqr
area forecast discussion
national weather service portland or
302 am pdt Wed aug 16 2017

Synopsis Northwest flow aloft will maintain onshore low level flow
across the region through the week that will keep temperatures near
seasonal normals. High pressure aloft strengthens over the weekend
for continuing dry weather. The region will remain in between two
upper level low pressure systems, one dropping south from the gulf of
alaska and a cut-off low off california. This will maintain
seasonable temperatures with typical morning clouds and afternoon
sunshine.

Short term Today through Friday... Very similar weather to Tuesday
is expected today. Some details are different though. Shallow
marine stratus filling in on the washington coast will work its way
south along the coast this morning. Does not appear it will make it
very far inland today. A weak tough rotating through the high pres
offshore will bring a deeper marine layer tonight. Models have been
advertising this feature fairly consistently so there should be more
clouds at the coast tonight and inland Thursday morning. The flat
ridging and associated subsidence should result in clearing Thursday
afternoon with temps inland a bit below today expected high temps.

On Friday there should be less low cloud coverage inland than there
was on Friday, with the best chance in the north along the columbia
river. There is a short wave moving through that will be increasing
the westerly onshore flow and the westerly flow aloft through the
day, keeping temperatures in check despite a decent amount of
sunshine, and setting the stage for increased low clouds coverage
Saturday morning much like on Thursday morning. Mh tolleson

Long term No changes. Previous discussion follows...

Friday night through Tuesday... Models remain in fairly good agreement
for the weekend. An upper level trough approaches the region, and an
upper low cuts off from the flow off of northern california as it
rounds the broad high pressure over the eastern pacific with the
upper ridge axis centered near 140w. This will leave the region under
diffluent flow aloft and weak onshore flow at low levels after
increased low clouds coverage Saturday morning. Continue to maintain
a dry forecast for Sunday through Tuesday with some overnight morning
cloud cover. Embedded shortwave impulses ahead of the primary upper
trough may either increase cloud coverage, depending on their timing
and at this lead time confidence in the precise cloud cover remains
low to moderate. That said, there does seem a notable trend towards
at least somewhat favorable eclipse viewing conditions. The key area
of lower confidence at this point is just how thick and widespread
any morning clouds will be. Confidence will hopefully increase in the
next several days, and with all eyes focused on Monday's eclipse,
continue to monitor the latest forecast with the expectation that
some changes will be made as the forecast is refined over the coming
days. cullen

Aviation Marine stratus will bring a period of ifr to low-end
MVFR CIGS to portions of the coast north of ktmk. The stratus
will likely linger along the north coast today, but should lift
toVFR this afternoon. Based on recent trends, don't think the
stratus will bring reduced CIGS to the central coast. Instead,
expect conditions similar to yesterday with MVFR vsbys due to
patchy fog this morning andVFR conditions this afternoon.

The interior will remain predominatelyVFR today and tonight,
with patchy stratus possible between 12-18z. Don't think the
stratus will bring reduced CIGS to interior TAF sites this
morning.

Kpdx and approaches...VFR the next 24 hours with patchy stratus
possible between 12-16z this morning. 64

Marine High pres will remain anchored over the coastal waters
through the weekend, with thermal low pres over northern ca and
southern or. This will keep the summer-time northerlies in place,
with breezy winds developing during the afternoon evening hours
over the next several days, especially south of newport. A sca
for winds is in effect this afternoon evening for the central or
waters. Expect additional SCA for winds through the weekend.

Seas will generally be around 5 to 7 ft through the period, but
may build to around 8 ft at times as the winds increase. Seas may
also become steep at times during the afternoon evening hours.

64

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory for winds from 3 pm this afternoon to
10 pm pdt this evening for coastal waters from cascade
head or to florence or out 60 nm.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 42 mi54 min 71°F1020 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 66 mi54 min 51°F1020 hPa
ASTO3 - 9439040 - Astoria, OR 74 mi54 min NNW 8 G 11 61°F 72°F1019.7 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi31 minNNW 710.00 miFair60°F54°F80%1019.5 hPa
Portland, Portland International Airport, OR7 mi31 minNW 810.00 miA Few Clouds60°F53°F78%1019.5 hPa
Portland-Hillsboro Airport, OR14 mi31 minN 010.00 miFair59°F50°F72%1019.2 hPa
Portland, Portland-Troutdale Airport, OR15 mi31 minN 010.00 miFair60°F52°F75%1019.5 hPa
Scappoose Industrial Airpark, OR19 mi31 minN 010.00 miFair59°F48°F69%1019.3 hPa
Aurora State Airport, OR20 mi31 minENE 310.00 miFair62°F50°F65%1019.7 hPa

Wind History from PDX (wind in knots)
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Last 24hrCalmCalm4NW5NW5W6NW10NW7
G14
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NW7N7N7NW10NW6NW5NW7NW9NW5N34NW43NW8
1 day agoN54NE433NW8W9Calm5NW7N5NW4NW7NW5NW4N4NW6NW53N4NW5CalmCalmCalm
2 days agoS3SW5SW7N3SW5NW6NW6
G15
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NW9NW8NW11NW14NW12NW8NW8NW5NW9NW6NW54NW3SW3Calm3

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 -- 12:58 AM PDT     Moonrise
Wed -- 01:05 AM PDT     8.17 feet High Tide
Wed -- 06:12 AM PDT     Sunrise
Wed -- 10:51 AM PDT     0.35 feet Low Tide
Wed -- 02:41 PM PDT     5.92 feet High Tide
Wed -- 04:02 PM PDT     Moonset
Wed -- 08:15 PM PDT     Sunset
Wed -- 10:30 PM PDT     2.33 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
78.287.46.45.23.92.71.710.50.41.63.75.55.95.65.14.43.73.12.62.42.6

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 -- 12:58 AM PDT     Moonrise
Wed -- 01:45 AM PDT     8.17 feet High Tide
Wed -- 06:12 AM PDT     Sunrise
Wed -- 10:52 AM PDT     0.35 feet Low Tide
Wed -- 03:21 PM PDT     5.92 feet High Tide
Wed -- 04:02 PM PDT     Moonset
Wed -- 08:15 PM PDT     Sunset
Wed -- 10:31 PM PDT     2.33 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.17.78.27.875.74.431.91.10.50.41.234.75.85.85.44.73.93.22.72.42.5

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 (11,2,3,4)
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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.