Wednesday, October28, 2020
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Marine Weather and Tides
Portland, OR

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:44AMSunset 6:04PM Wednesday October 28, 2020 7:31 PM PDT (02:31 UTC) Moonrise 4:22PMMoonset 3:38AM Illumination 93% Phase: Waxing Gibbous; Moon at 12 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 Pm Pdt Wed Oct 28 2020
In the main channel.. - general seas...2 to 4 ft through Thursday. - first ebb... Around 345 pm Wednesday, with seas near 5 ft. - second ebb...around 400 am Thursday, with seas near 5 ft. - third ebb...around 400 pm Thursday, with seas near 5 ft.
PZZ200 250 Pm Pdt Wed Oct 28 2020
Synopsis for the southern washington and northern oregon coast.. High pressure over the offshore waters, along with a thermal low pressure on the far south oregon coast, will result in little change in the current pattern through Thursday. A weakening front will push across the region Thursday night and inland on Friday. High pressure then rebuilds across the waters over the weekend.


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 282057 AFDPQR

Area Forecast Discussion National Weather Service Portland OR 156 PM PDT Wed Oct 28 2020

SYNOPSIS. High pressure aloft will remain over the region through Thursday. Low-level inversions tonight and Thursday morning will result in greater fog and stratus coverage. A weak frontal system slides over the area Friday. High pressure and dry weather returns this weekend leading to renewed valley inversions resulting in night and morning fog. A change to a more progressive pattern looks to begin around the middle of next week.

SHORT TERM. Tonight through Saturday . Goes-17 RGB product valid 20Z showed generally clear skies. There was a small patch of low cloud at the mouth of the Columbia River. Water vapor imagery indicated strong 500 mb high pressure over the eastern Pacific, with the main jet stream well to the north.

The upper level ridge remains in place tonight and Thursday morning and then starts to weaken late Thursday as a frontal system approaches Vancouver Island. Low-level inversions tonight will be a little stronger compared to last night. Thus, anticipate greater fog and stratus coverage late tonight and Thursday morning. Would not be surprised if dense fog coverage is enough for a Dense Fog Advisory. Min temps have generally been lower than guidance and see no reason this will be any different for Thursday morning. Have gone a little below guidance, especially for the interior valleys. Model forecast 850 mb temps valid 00Z Friday show little change from today. However, interior valley max temps will be tricky, dependent on how persistent the fog/stratus ends up. The 12Z HREF guidance suggests stratus in portions of the Willamette Valley may persist into early afternoon. Went slightly below most guidance for the interior valleys.

The aforementioned weak cold front is expected to reach the south Washington and far north Oregon coast around 12Z Friday. Precip chances gradually increase through the day Friday, with the highest QPF, on the order of a quarter inch, focused on the south Washington coast, Willapa Hills and far north Oregon Coast Range. The southeast quarter of the forecast area, generally Albany to Willamette Pass, may not get anything from this system. A few lingering showers will be possible over the south Washington and north Oregon Cascades and foothills Friday evening. The Friday frontal system will be a one-hit wonder as high pressure quickly begins to rebound Friday night. Models show the surface high pressure axis generally near a Newport to Sweet Home line, with light northeast flow to the south of the line and minimal surface flow to the north.

High pressure, surface and aloft, strengthen Saturday. The NAM, GFS and ECMWF indicate thermally-induced surface low pressure over the far south part of the forecast area expanding north during the day. The air mass Saturday does not appear to be as warm as today or tomorrow, based on model forecast 850 mb temps. However, the low-level northeast flow should provide a little extra boost. Weishaar

LONG TERM. Saturday night through Wednesday . High pressure holds firm Saturday night through Monday. Low-level valley inversions become more established Saturday night. Sunday and Monday remain dry, with daytime temperatures generally a little above average. However, some areas in the interior valleys could end up a few degrees below normal due to persistent inversions. A change in the large scale pattern looks to begin Monday night or Tuesday. The operational GFS and a majority of the ensemble members hold on to the ridge Monday and then show more zonal flow beginning 12Z Tue.

The operational GFS and ECMWF drag another front across the area late Monday night and Tuesday. The total mean 500 mb cluster valid 00Z Wed maintains slightly higher-than-normal heights. The ECMWF ensemble mean shows around one-quarter inch QPF for KPDX and KSLE Tuesday. A high majority of the individual ensemble members indicate some measure of QPF. The zonal pattern continues through Wednesday, per the deterministic and associated ensemble runs. However, based on the pattern over the past several weeks, would not be surprised if future model runs trended weaker with these fronts and maintained some degree of ridging. With this in mind, opted to go with Superblend POPS Tuesday night and Wednesday, which were lower than the NBM guidance. Weishaar

AVIATION. VFR conditions under predominately clear skies through the evening. Around 05Z to 08Z Thursday IFR/LIFR conditions are likely to manifest again for northern locations within the Willamette Valley, along the Columbia River, KEUG and northern coastal areas. Areas within the central Willamette Valley and south of KONP expect IFR/LIFR conditions to manifest around 07Z to 09Z Thursday. VFR conditions expected to return after 18Z Thursday.

For detailed regional Pac NW weather information, go online to: http://weather.gov/zse

KPDX AND APPROACHES . VFR under predominately clear skies expected to dominate through tonight. IFR/LIFR conditions are expected to return around 08Z Thursday. VFR conditions expected to return after 18Z Thursday. /42

MARINE. High pressure offshore will maintain northerly winds across the waters through Thursday, with the strongest winds expected over the coastal waters south of Cascade Head. Seas will stay in the 4 to 6 ft. Minimal change in these conditions is expected through Thursday evening.

A front approaches the region late Thursday night and into Friday morning. Expect light to moderate southerly winds through Friday afternoon, with winds around 10 to 20 kt with potential gusts up to 25 kt. Model agreement is improving but, each successive model run is weakening the winds that will impact the waters. Therefore, will not issue a small craft advisory at this time as confidence is low. Will pass these observations to the oncoming shifts. Seas will build on Friday but, will likely peak between 7 and 9 ft Friday for most waters. The exception to this is zone PZZ270, which could have seas close to 10 ft during this time.

Seas will subside and winds will return to a more northerly direction through the weekend as high pressure rebuild across the area. /42

PQR WATCHES/WARNINGS/ADVISORIES. OR . None. WA . None. 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 mi43 min 55°F1021.5 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 66 mi43 min 53°F1022.4 hPa
ASTO3 - 9439040 - Astoria, OR 74 mi43 min N 2.9 G 4.1 56°F 56°F1022.1 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi38 minN 010.00 miFair53°F44°F72%1020.8 hPa
Portland, Portland International Airport, OR7 mi38 minN 010.00 miA Few Clouds57°F48°F72%1021.1 hPa
Portland-Hillsboro Airport, OR14 mi38 minN 010.00 miFair55°F48°F80%1021 hPa
Portland, Portland-Troutdale Airport, OR15 mi38 minN 010.00 miFair53°F44°F72%1021.1 hPa
Scappoose Industrial Airpark, OR19 mi38 minW 310.00 miFair50°F48°F93%1020.7 hPa
Aurora State Airport, OR20 mi38 minN 010.00 miFair56°F46°F72%1021.2 hPa

Link to 5 minute data for KVUO

Wind History from VUO (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW3W3W4CalmSW3SW4SW4W5CalmCalm
1 day agoCalmSE4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW3CalmCalmSW4SW5W3CalmCalmCalmCalm
2 days agoCalmCalmE5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW4W4SW3CalmN3SW3SW3CalmCalm

Tide / Current Tables for Vancouver, Columbia River, Washington (dubious accuracy)
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Vancouver
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Wed -- 01:01 AM PDT     0.15 feet Low Tide
Wed -- 04:37 AM PDT     Moonset
Wed -- 05:21 AM PDT     1.33 feet High Tide
Wed -- 07:45 AM PDT     Sunrise
Wed -- 01:19 PM PDT     0.01 feet Low Tide
Wed -- 05:22 PM PDT     Moonrise
Wed -- 06:02 PM PDT     Sunset
Wed -- 06:06 PM PDT     1.50 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20.30.71.11.31.31.21.11.110.70.300.10.511.41.51.51.41.31.21

Tide / Current Tables for Tillamook, Hoquarten Slough, Oregon
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Tillamook
Click for Map
Wed -- 12:04 AM PDT     5.52 feet High Tide
Wed -- 04:42 AM PDT     Moonset
Wed -- 07:34 AM PDT     0.73 feet Low Tide
Wed -- 07:50 AM PDT     Sunrise
Wed -- 12:33 PM PDT     6.28 feet High Tide
Wed -- 05:26 PM PDT     Moonrise
Wed -- 06:07 PM PDT     Sunset
Wed -- 08:13 PM PDT     0.79 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.55.34.84321.20.80.81.83.456.16.25.8542.81.81.10.81.12.33.9

Weather Map
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wmap_P
GEOS Local Image of PacificNorthwest    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
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 numerous 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.