Friday, April10, 2020
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Marine Weather and Tides
Troutdale, OR

Version 3.4
NOTICE
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 6:31AMSunset 7:50PM Thursday April 9, 2020 10:33 PM PDT (05:33 UTC) Moonrise 9:13PMMoonset 6:49AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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- 200 Pm Pdt Thu Apr 9 2020
In the main channel.. - general seas...3 to 5 ft through Friday. - first ebb...around 645 pm Thursday, with seas near 5 ft. - second ebb...very strong ebb around 715 am Friday, seas near 9 ft with breakers possible. - third ebb...around 730 pm Friday, seas near 9 ft with breakers likely.
PZZ200 200 Pm Pdt Thu Apr 9 2020
Synopsis for the southern washington and northern oregon coast.. High pressure over the waters will persist through early next week. A thermal trough along the coast brings small craft northerly winds to the area through Fri morning.


7 Day Forecast for Marine Location Near Troutdale, OR
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location: 45.5, -122.39     debug


Area Discussion for - Portland, OR
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FXUS66 KPQR 100301 AFDPQR

Area Forecast Discussion National Weather Service Portland OR 800 PM PDT Thu Apr 9 2020

SYNOPSIS. High pressure will remain over the Pacific Northwest today and then weakens tonight through early Saturday as a broad upper level trough becomes established over eastern Washington and the Northern Rockies. High pressure nudges closer to the coast Sunday into early next week for dry and slightly above normal daytime temperatures. Dry conditions look to persist the latter half of next week.

SHORT TERM. Tonight through Sunday . No changes. Previous discussion follows. Water vapor imagery showed a closed upper low centered over southern Nevada and southeast California and a broad upper level ridge over the central and northeast Pacific. The northern branch of the jet stream remains well to the north across the west and central Canadian provinces. Early afternoon visible imagery was devoid of any cloud cover, except for a narrow ribbon of marine stratus off the south Washington coast and some stratus creeping up the south Oregon coast.

The 19Z MSAS surface analysis indicated a thermally-induced surface trough extending from the SW Washington lowlands to the central Oregon Cascades. At 20Z the KTTD-KDLS was nearly neutral. Favored east wind locations at the west end of the Gorge were showing light West to Northwest wind. Onshore low-level flow will gradually strengthen this evening and tonight as the upper ridge flattens. Expect marine stratus along the coast and into the coastal valleys overnight and likely reaching some of the interior lowlands around sunrise.

Moderate onshore flow Friday will produce breezy to windy conditions in the Central Columbia River Gorge. The NAM suggests a 5-6 mb KTTD-KDLS gradient Fri afternoon, which would translate to 30-35 mph gusts. The marine layer is expected to retreat to the coast Fri afternoon, with limited, if any, clearing. Model 850 mb temps Fri show a 5-8C decline compared to this afternoon. Thus, Fri max temps will be closer to seasonal normals. 500 mb heights continue a slow decline Fri night and Sat as a slightly stronger short-wave slides across eastern Washington and far northeast Oregon. As a result, would expect a deeper marine layer and have added patchy drizzle to the forecast. Sat afternoon looks pleasant, with gusty afternoon wind, especially in the Central Gorge and the Cascades. Models are in good agreement showing a return to northeast to east low-level flow Sat night. Sunday will be dry with daytime temperatures 4-7 degrees above normal. Weishaar

LONG TERM. Sunday Night through Thursday . No changes. Previous discussion follows. Model guidance, including the various ensembles, continue to trend drier for the extended period. A sharply amplified ridge centered along 130W early next week will result in north flow aloft over the forecast area. Daytime temps Mon and Tue will remain slightly above normal. The past couple of days the deterministic model guidance was showing some possibility of precip in the Tue through Wed time frame. The 12Z runs today and the ensembles have trended drier and this is reflected in the latest forecast. The operational ECMWF tries to develop a small, closed 500 mb low near 45N 130W Tue night and drop it south to southeast to the south Oregon coast by Wed. The operational GFS has a slight hint of short- wave off the Washington coast Wed afternoon. A few GFS ensembles members are similar to the operational ECMWF. The GEFS mean does not support the ECMWF, but there is increased spread among the various GEFS members. Weishaar

AVIATION. Gusty northerly winds along the coast expected to decrease this evening, but also turn a little more directly onshore. While most of northwest Oregon and southwest Washington remained VFR Thursday evening, a few patches of low clouds and fog were developing along the coast creating local IFR conditions. Expect IFR conditions to become more widespread along the coast overnight through 10Z, with the coast then remaining as IFR to MVFR through much of the day Friday through 03Z. Inland, expect some clouds to spread up the lower Columbia River as far as about KPDX and KTTD, and through the Coast Range and locally into the south Willamette Valley around KEUG briefly Friday morning between 14Z and 18Z. These clouds, if they reach these TAF locations, are most likely to come in as MVFR to low end VFR ceilings, but will give way again to clearing after 18Z for VFR conditions.

PDX AND APPROACHES . Mostly VFR conditions expected over the next 24 hours. It is likely that some clouds will spread in during the morning hours, most likely between 15Z and 18Z, and would temporarily bring MVFR or low end VFR ceilings.

MARINE. No changes. Previous discussion follows. High pressure aloft will continue through the beginning of next week which will keep the thermal trough trend in the afternoon likelihood throughout the forecast period. The thermal trough that is currently along the northern California border will continue to tighten gradients and produce wind gusts between 25 to 30 kt along the Oregon coast. This will keep the SCA in effect through tonight and into Fri morning. By Fri afternoon the trough will move south and winds will weaken slightly. A shortwave trough near Vancouver Island will move slightly south which will keep the potential for SCA winds through Sat morning.

Swell generation has been fairly weak in the Northeast Pacific in the last couple of days leaving the significant wave height to be primarily composed of wind wave. Amplification of northerly winds due to afternoon heating will increase the likelihood of square seas along the central coast through the rest of the evening. Seas will continue to trend between 6 to 8 ft through the weekend and then drop to around 5 ft during the first half of next week. -BPhillips

PQR WATCHES/WARNINGS/ADVISORIES. OR . None. WA . None. PZ . Small Craft Advisory until 8 AM PDT Friday for coastal waters from Cape Shoalwater WA to Cascade Head OR out 60 NM.

Small Craft Advisory until 11 AM PDT Friday for coastal waters from Cascade Head OR to Florence OR out 60 NM.



Interact with us via social media: www.facebook.com/NWSPortland www.twitter.com/NWSPortland

This discussion is for Northwest oregon and Southwest Washington from the Cascade crest to 60 nm offshore. This area is commonly referred to as the forecast area.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 51 mi51 min 49°F1018.4 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 81 mi45 min 54°F1019.7 hPa
ASTO3 - 9439040 - Astoria, OR 88 mi51 min SE 5.1 G 6 48°F 50°F1019.7 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Portland, Portland-Troutdale Airport, OR3 mi40 minW 410.00 miFair63°F39°F43%1016 hPa
Portland, Portland International Airport, OR13 mi40 minNW 1310.00 miFair60°F42°F52%1016.4 hPa
Pearson Airfield, WA17 mi40 minNW 8 G 1610.00 miFair62°F39°F44%1016.3 hPa

Link to 5 minute data for KTTD

Wind History from TTD (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmE4CalmW4W3W4W55W8NW8W7W7NW6W6W5W5W4
1 day agoW3W4S3SE3E4E3CalmE5CalmCalm3CalmNW63W44Calm4E6E4CalmCalmCalmCalm
2 days agoW75W3NW4NW5CalmW4SW6SW4CalmW3W55NW8--4W55NW54NW4NW43NW4

Tide / Current Tables for Vancouver, Columbia River, Washington (dubious accuracy)
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Vancouver
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Fri -- 04:57 AM PDT     0.19 feet Low Tide
Fri -- 06:32 AM PDT     Sunrise
Fri -- 08:22 AM PDT     Moonset
Fri -- 09:35 AM PDT     2.05 feet High Tide
Fri -- 05:36 PM PDT     -0.29 feet Low Tide
Fri -- 07:51 PM PDT     Sunset
Fri -- 10:21 PM PDT     1.60 feet High Tide
Fri -- 11:33 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.10.90.80.60.30.20.40.91.6221.71.30.90.70.40.1-0.2-0.30.10.71.31.61.5

Tide / Current Tables for Tillamook, Hoquarten Slough, Oregon
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Tillamook
Click for Map
Fri -- 03:26 AM PDT     7.27 feet High Tide
Fri -- 06:37 AM PDT     Sunrise
Fri -- 08:27 AM PDT     Moonset
Fri -- 11:30 AM PDT     -0.71 feet Low Tide
Fri -- 04:31 PM PDT     5.85 feet High Tide
Fri -- 07:56 PM PDT     Sunset
Fri -- 11:26 PM PDT     0.89 feet Low Tide
Fri -- 11:37 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.63.75.87.17.26.65.542.51-0.1-0.6-0.50.72.64.55.75.85.34.43.32.21.40.9

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Portland, OR (1,6,7,8)
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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 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.