Sunday, August20, 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 6:17AMSunset 8:09PM Sunday August 20, 2017 1:04 AM PDT (08:04 UTC) Moonrise 3:58AMMoonset 6:40PM Illumination 4% 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- 847 Pm Pdt Sat Aug 19 2017
In the main channel..Combined seas 3 to 5 ft through Sunday morning...subsiding to 2 to 4 ft in the afternoon. However, seas will temporarily build to around 8 ft during the very strong ebb around 415 am Sunday morning, and to around 5 ft with the ebb around 445 pm Sunday afternoon.
PZZ200 847 Pm Pdt Sat Aug 19 2017
Synopsis for southern washington and northern oregon coast.. There will be little change in the marine weather through mid next week as high pressure persists over the ne pacific and a thermal trough remains across the southern oregon coast.

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 200401
afdpqr
area forecast discussion
national weather service portland or
859 pm pdt Sat aug 19 2017

Synopsis Weak onshore flow continues through Sunday, particularly
along the columbia river and the north part of our forecast area. One
last very weak upper disturbance will pass through Sunday afternoon
and night, and maintain the onshore flow before an upper ridge builds
in on Monday and continues Tuesday for warmer temperatures. Low
clouds will mainly be along the south washington and north oregon
coast Monday morning and locally inland along the columbia river. The
upper ridge will reduce the onshore flow for Tuesday. A significant
upper trough will approach Wednesday with increased onshore flow and
a bit of cooling, then some chance of showers Wednesday night and
Thursday. Another upper ridge starts to build by the weekend for
drying and warming.

Short term Tonight through Tuesday... The evening models have come
in without any surprises. Still tracking a very weak short wave
passage Sunday afternoon early evening, which will keep the modest
onshore flow going through Sunday night. By Monday morning, the
pacific ridge axis noses northeast to NW oregon SW washington
coastline. Surface winds remain generally onshore, but above 925 mb
winds turning north northeast by early morning. Current forecast
grids call for shallow stratus SW washington and along the lower
columbia river and appear right on track. Could see scattered areas
of thin stratus cascade foothills along the northern willamette
valley, but nothing too substantial. High confidence continues that
the path of total eclipse east of the the coast will be clear. Flow
also turns offshore along central coast Monday morning, so middle-
range confidence of partly-to-mostly clear skies there. The next two
afternoons should bring plenty of sunshine again, with slightly
above normal temperatures. The remainder of the forecast discussion
is unchanged. Drb
the modest upper ridge will continue over the pacific northwest on
Tuesday. The models show some morning low clouds along the coast
Tuesday morning but that coverage inland will be sparse at best.

Temps will again approach 90 inland on Tuesday.

A weak low develops over northern california early in the week and
there is a slight chance of a thunderstorm getting close to
willamette pass late Tuesday, though they mainly may end up being in
central oregon. Tolleson

Long term Tuesday night through Saturday... A decent late summer
system will approach Wednesday with increasing southwest flow aloft,
possibly increasing the onshore flow some with a bit of cooling.

There is again a slight chance of thunder near willamette pass late
Wednesday but the most likely scenario is that most will stay south
and east of our area. The approaching system moves through Wednesday
night and Thursday with plenty of clouds and some chance of showers.

Some lingering onshore flow will give way to more sunshine on Friday
as conditions begin to improve in the wake of the Thursday system.

Saturday is looking sunny and mild with perhaps a little fog or low
clouds at the coast. Tolleson

Aviation Delayed onset of stratus at kast as waters remain
mostly clear at this time with no indication of coastal stratus
development yet. Otherwise, forecast seems on track with stratus
possibly extending as far inland as kpdx before quickly mixing
out in the morning. Gusty winds at several TAF sites this evening
will taper off in the next few hours.

Kpdx and approaches...VFR conditions tonight with breezing
conditions this evening tapering off by 05z. Stratus expected to
reach the terminal for a few hours in the morning before clear
skies arrive for the remainder of the day. Bentley

Marine A persistent weather pattern will result in little
change in the marine weather the next several days. High pressure
holds over the NE pacific while a thermal trough is along the
south oregon coast. This supports north winds across the south
washington and north oregon waters. The thermal trough
strengthens each afternoon such that the north winds will
increase and become gusty each afternoon. The winds south of
cascade head will have frequent gusts to around 25 kt which
supports the current small craft advisory for winds.

The seas will be locally generated from these winds and generally
remain 4 to 6 ft with periods at 9 to 10 seconds. The seas will
be choppier in the southern waters for the afternoons with
dominant periods possibly around 8 seconds. ~tj bentley

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory for winds until 11 pm pdt Monday 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 mi46 min 71°F1021.7 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 66 mi46 min 51°F1022.1 hPa
ASTO3 - 9439040 - Astoria, OR 74 mi46 min SE 2.9 G 5.1 58°F 68°F1022.2 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi71 minNW 710.00 miFair63°F51°F65%1020.6 hPa
Portland, Portland International Airport, OR7 mi71 minNW 910.00 miFair62°F51°F67%1020.7 hPa
Portland-Hillsboro Airport, OR14 mi71 minNW 1110.00 miFair60°F46°F62%1020.5 hPa
Portland, Portland-Troutdale Airport, OR15 mi71 minW 510.00 miFair63°F52°F68%1020.3 hPa
Scappoose Industrial Airpark, OR19 mi71 minNW 910.00 miFair60°F48°F65%1020.5 hPa
Aurora State Airport, OR20 mi71 minN 910.00 miFair62°F46°F58%1020.9 hPa

Wind History from VUO (wind in knots)
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Last 24hrNW4NW7NW8NW8
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1 day ago4NW3N4CalmCalmCalmCalm56W4NW76NW665NW7N8
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2 days agoNW4NW4NW6NW5NW5N6NW565NW53NW6W5W8W10
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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

Sun -- 01:56 AM PDT     1.88 feet Low Tide
Sun -- 04:57 AM PDT     Moonrise
Sun -- 05:21 AM PDT     8.84 feet High Tide
Sun -- 06:17 AM PDT     Sunrise
Sun -- 02:56 PM PDT     -1.38 feet Low Tide
Sun -- 06:41 PM PDT     7.54 feet High Tide
Sun -- 07:39 PM PDT     Moonset
Sun -- 08:09 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.62.11.93.46.48.68.78.16.95.53.92.40.9-0.3-1.1-1.40.33.76.87.57.16.35.34.2

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

Sun -- 01:57 AM PDT     1.88 feet Low Tide
Sun -- 04:57 AM PDT     Moonrise
Sun -- 06:01 AM PDT     8.84 feet High Tide
Sun -- 06:17 AM PDT     Sunrise
Sun -- 02:57 PM PDT     -1.38 feet Low Tide
Sun -- 07:21 PM PDT     7.54 feet High Tide
Sun -- 07:39 PM PDT     Moonset
Sun -- 08:09 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.82.11.935.47.88.88.57.66.24.52.81.2-0.1-1.1-1.4-0.22.65.67.47.46.85.84.6

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.