Thursday, April2, 2020
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Marine Weather and Tides
Portland, 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 6:45AMSunset 7:42PM Thursday April 2, 2020 6:03 PM PDT (01:03 UTC) Moonrise 12:01PMMoonset 2:59AM Illumination 75% Phase: Waxing Gibbous; Moon at 10 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- 234 Pm Pdt Thu Apr 2 2020
In the main channel.. - general seas.. 3 to 4 ft tonight and Friday. - first ebb...around 130 am Friday. Seas to 5 ft. - second ebb...around 145 pm Friday. Seas to 6 ft. - third ebb...around 230 am Saturday. Seas to 4 ft.
PZZ200 234 Pm Pdt Thu Apr 2 2020
Synopsis for the southern washington and northern oregon coast.. High pressure will remain offshore through this weekend, with thermal low pressure over nw california. This will maintain northerly winds through that time.


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 022202 AFDPQR

Area Forecast Discussion National Weather Service Portland OR 302 PM PDT Thu Apr 2 2020

SYNOPSIS. A cool and unsettled pattern continues through the weekend as low pressure remains over the area. However, there may be very light snow accumulations at low elevations through Friday night with a couple inches possible above 1500 feet. An upper low slides just west and then south of the area Saturday with the bulk of precipitation staying over southwest Oregon. Dry weather may return early next week, but it's far from certain.

SHORT TERM. Tonight through Sunday . Main concerns revolve around potential for very light snow accumulations tonight and early Friday across the lower interior elevations. A slightly cooler air mass will drop south to over the CWA tonight following the short wave bringing an increase to showers activity today. Primary snow level will fall to around 500 feet under a 1200 foot freezing level. Valley temperatures tonight will locally reach the lower 30s with the mid 30s possible across the Portland Metro. Showers will diminish this evening as the short wave continues moving southeast of the region, however, the next short wave in the train will start spreading very light QPF across the northern CWA tier by daybreak Friday. Certainly do not see any significant snow amounts with just a couple hundredths of liquid equivalent here or there. The key phrase for elevations below 1000 feet will be "Little or no snow accumulation," however, just about anybody near sea level from Salem/Lincoln City northward could see snow flakes in the air Friday morning. Snow levels rise as warming occurs during the day, but never really escapes the higher foothills.

Conditions dry out by late Friday evening, but then a closed low approaches the coast from the west-northwest. Models have been largely pushing precip to our south, but this morning's 12Z models did bring some rain/snow across lane County by early Saturday morning. The upper low opens up into a negatively tilted trough swinging northeast across up Saturday evening. Most of the convective energy will push southeast of the CWA, however, the central Cascades may end up in a bit of a deformation zone with a couple inches of snow.

By Sunday, another shortwave drops south along the flow and merges with the Saturday trough remnants to begin developing a cut-off upper low just offshore the OR/CA border. This will send additional precip north across the area, but it also appears to be coming with a modestly warmer air mass. Main uncertainty fro Sunday will be where does a wrap around deformation band set up with potential to bring 0.25-0.50" of precip. Snow levels appear to be 3500-4000 feet at this time, but may end up bringing a decent late season snowfall the some portion of the Cascades if everything comes together. /JBonk

LONG TERM. Sunday night through Thursday . No significant changes made due to models continuing to struggle with upper long wave pattern. Remaining previous long term discussion follows: While models have continued to struggle with the general pattern late in the period, there is a trend in the models early next week, suggesting ridging potentially building in, lessening the chances for showers again Monday and Tuesday. Deterministic GFS and ECMWF from 00Z in some agreement with dry weather as split flow over the region or light onshore flow. However 00Z ECMWF ensemble members are show potential for a wetter pattern developing Wednesday and Thursday. /mh

AVIATION. Cool northwesterly flow aloft will continue through Friday. A weak disturbance will continue to move across the region this afternoon. Expect mainly VFR conditions through tonight, with occasional periods of MVFR possible under isolated showers. Showers will gradually decrease late this afternoon. Another weak disturbance will move across the region late tonight into Friday morning and could bring occasional light showers or drizzle after midnight along the coast and after sunrise inland, with patchy MVFR possible. Friday afternoon should be a near repeat of today, with showers decreasing late.

PDX AND APPROACHES . Mainly VFR through tonight, with periods of MVFR possible under isolated showers. Showers will decrease late this afternoon, but another disturbance may bring some light showers or drizzle after 12Z Friday, with occasional MVFR possible through the morning. Showers expected to gradually decrease Friday afternoon.

MARINE. Rather tranquil conditions expected across the waters for the next several days with winds generally less than 15 kt and seas in the 3 to 5 ft range. High pressure and weak thermal pressure sits offshore over the weekend and will maintain winds around 10 to 15 kt, with seas in the 4 to 6 ft range.

PQR WATCHES/WARNINGS/ADVISORIES. OR . None. WA . None. PZ . None.

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 42 mi63 min 47°F1022.6 hPa (-1.0)
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 66 mi63 min 50°F1024.2 hPa (-0.3)
ASTO3 - 9439040 - Astoria, OR 74 mi63 min SW 1 G 5.1 47°F 49°F1023.2 hPa (+0.0)

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi2.2 hrsSW 510.00 miOvercast49°F37°F64%1022.9 hPa
Portland, Portland International Airport, OR7 mi2.2 hrsNNW 310.00 miMostly Cloudy49°F36°F61%1023 hPa
Portland-Hillsboro Airport, OR14 mi2.2 hrsVar 310.00 miMostly Cloudy50°F36°F59%1022.6 hPa
Portland, Portland-Troutdale Airport, OR15 mi2.2 hrsWSW 810.00 miLight Rain48°F36°F63%1023.1 hPa
Scappoose Industrial Airpark, OR19 mi2.2 hrsESE 310.00 miOvercast48°F37°F66%1022.7 hPa
Aurora State Airport, OR20 mi2.2 hrsVar 310.00 miOvercast49°F36°F61%1023.1 hPa

Link to 5 minute data for KPDX

Wind History from PDX (wind in knots)
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Last 24hrN3CalmCalmCalmCalmSW3W4CalmCalmCalmS3CalmCalmS3S3S5SW5NW6Calm33N9W14NW3
1 day agoE4NW5W7W11SW5SW11SW8S4S6S8S9SW7SW4S5SW7S6S8S10SW11S10SW9S8SW73
2 days agoSW8
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W11S7SW8S6S4S7S7S7S8SW3SW8SW3CalmW4NW6SW7W7SW7N4CalmN4W5SE6

Tide / Current Tables for Portland, Willamette River, Oregon - IGNORE HEIGHTS
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Vancouver, Washington - IGNORE HEIGHTS
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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
Wind Forecast for Portland, OR (21,6,7,8)
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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.