Tuesday, January26, 2021
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Marine Weather and Tides
Skamokawa Valley, WA

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:38AMSunset 5:10PM Tuesday January 26, 2021 6:52 PM PST (02:52 UTC) Moonrise 2:59PMMoonset 6:30AM Illumination 98% Phase: Waxing Gibbous; Moon at 14 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- 230 Pm Pst Tue Jan 26 2021
.small craft advisory in effect through Wednesday afternoon...
In the main channel.. - general seas...between 10 to 12 ft tonight through Wed. - first ebb...strong ebb around 315 pm Tue. Seas near 15 ft with breakers likely. - second ebb...around 4 am Wed, with seas near 13 ft. - third ebb...strong ebb around 4 pm Wed. Seas near 13 ft with breakers likely.
PZZ200 230 Pm Pst Tue Jan 26 2021
Synopsis for the southern washington and northern oregon coast.. A strong occluded front over the coastal waters will push somewhat inland this afternoon into this evening. A broad area of low pres will remain over the waters through Thu. Another round of rather active weather with winds and higher seas is expected this weekend.


7 Day Forecast for Marine Location Near Skamokawa Valley, WA
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location: 46.27, -123.45     debug


Area Discussion for - Portland, OR
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FXUS66 KPQR 262332 AFDPQR

Area Forecast Discussion National Weather Service Portland OR 331 PM PST Tue Jan 26 2021

SYNOPSIS. A dynamic occluded front continues to push north from the Pacific bringing mixed precipitation and snowfall to the area. This front will move inland through the evening tonight and weaken through the morning on Wednesday. Expecting more showery conditions Wednesday through Thursday before a weak ridge attempts to build in behind it. Potential for a bit more "active" weather over the weekend.

SHORT TERM. Tonight through Thursday night . Quite an active afternoon as a strong occluded front pushes northward from the Pacific. What started off as rain along the coast became a rain snow mix for a few hours. Most coastal areas have turned back to rain and will continue to stay there through the evening. As we look east, the Coast Range was the first to really get a good amount of accumulating snow and will continue to do so for a few more areas. The snow accumulations will be highest above 500 ft along the Coast Range where they could see 2 to 4 inches and possibly higher amounts above 800 ft. Shifting slightly lower, around 200-500 ft, accumulations will likely stay below 2 inches. Could also see slight snow accumulation on roadways.

The Willamette Valley was a bit of a surprise this afternoon as the snow arrived a bit earlier and heavier than expected. This was mainly due to the evaporative cooling that the higher precipitation rates produced. Areas around Corvallis saw temperatures drop from 37 degrees to near freezing in about an hour even. Because of the cooling and dry air at the surface, more snow was able to reach the surface at a quicker rate than expected. Local webcams around the area are showing anywhere from 0.5 to 1 inch of snow west of I-5 in the central Willamette Valley, and more snow accumulation is possible. Shifting northward, a rain snow mix is more widespread. The west hills of Portland, western Washington County and northern Clark County are experiencing more consistent snow with higher accumulations. While the inner Portland/Vancouver Metro continues with the rain/snow mix with struggling accumulations. Easterly winds through the Columbia River Gorge has formed a shallow layer of drier air which has caused the precipitation to evaporate before reaching the surface. Hence why areas around the Columbia River were the last areas to see the snow starting to fall.

These snow conditions will persist for the next few hours with accumulations highest along the Coast Range, Cascades foothills and Cascades Range. Most locations within the forecast area are under a Winter Weather Advisory through Wednesday early morning. Snow should transition to rain and become showery in the post frontal environment as precipitation rates lighten up later this evening. The exact timing of this change is difficult to forecast as it will greatly depend on whether or not the front will be reinvigorated by any post frontal lift. Another challenge that may occur during the overnight hours is the chance for the freezing of any melted snow or rain from this afternoon. In areas with more accumulating snow, around 2 inches or more, there tends to be an insulating effect which will keep those areas cooler than those without much accumulation. Combine this with continued easterly winds and the residual cool air, there is a chance that freezing could occur overnight into the early morning hours on Wednesday . potentially impacting the morning commute. For areas that have less snow cover, the ground likely will be able to radiate heat and assist in keeping any freezing at bay. There are so many factors that go into this chance for refreezing so there is not a ton of confidence so will just say that there is a chance.

Showers will persist through Wednesday in the post frontal environment. Snow will remain concentrated to the Coast and Cascades Ranges above 1000-1500 ft or so, while elsewhere will be rainy. Not expecting too much accumulation of either rain or snow. Precipitation will continue to lighten through Wednesday evening into Thursday as all residual shortwaves move out of the area and an area of very weak high pressure attempts to develop on Thursday night. -Muessle

LONG TERM. Friday through Monday . A shortwave upper ridge may provide a brief break in precipitation Friday morning, but the next front will bring another chance for rain and snow (above 2000 feet) Friday afternoon or evening through Saturday. A complex low over the Pacific supports the chance for waves to either bring a series of fronts across the area or slow the movement of the Saturday front for potentially a prolonged period of wet weather Saturday through Tuesday. The GEFS and ECMWF Integrated Vapor Transport (IVT) forecast is trending towards a possible weak atmospheric river (AR) event. There is potential for the Cascades to have a few days of accumulating snow as snow levels are expected to roughly be 2500 to 3500 feet during this wet period. ~TJ

AVIATION. Front offshore continues to spread rain across region, with inland low elevation snow. Widespread MVFR, with areas of IFR where snow is occurring. Do think snow will trend to decrease for the lowlands after 03Z to 04Z. Afterwards, will trend to showery precipitation, with snow levels sitting closer to 1000 feet. Even so, will maintain widespread MVFR overnight. Showers decreasing overnight, with mix of MVFR to lower VFR after 12Z, with not much change through Wed am.

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

KPDX AND APPROACHES . CIGS will quickly drop to MVFR as the precipitation spreads across region through 23Z. Air mass such that will see mix of rain/snow, but will have a period of just snow at times between 23Z and 04Z. Overall, MVFR with occasional IFR during that time. Again, think may see wet dusting to half inch on grassy areas, but any snow that does fall will melt this evening, with no danger of freezing overnight. Overnight will maintain MVFR, with decreasing showers. /Rockey

MARINE. Broad area of low pres over the offshore waters continues to slowly drop southeastward tonight. Front now pushing closer to shore, with southeasterly gales still on the waters. Overall, strongest winds are just offshore, with winds gusting 35 to 45 kt on the outer waters. Closer to shore, gusts mostly 30 to 35 kt. Winds will ease this evening, and stay in the 15 to 20 kt range overnight into Wed. Will keep current Gale Warning through 7 pm, but will need Small Craft Advisories afterwards to cover the gusty winds and seas that will stay in the mid-teens.

A rebuilding westerly swell late tonight are expected to keep seas a little above 10 ft through Wednesday night. A broad area of low pressure is expected to linger past mid week over the coastal waters, and may bring some wind gusts up into the range of 20 to 25 kt Wednesday and Wednesday night. Another chance for small craft level winds comes with a front Friday night. /Rockey

PQR WATCHES/WARNINGS/ADVISORIES. OR . Winter Weather Advisory until 7 AM PST Wednesday for Cascade Foothills in Lane County-Cascades in Lane County-Central Columbia River Gorge-Northern Oregon Cascade Foothills- Northern Oregon Cascades-Upper Hood River Valley.

Winter Weather Advisory until 4 AM PST Wednesday for Greater Portland Metro Area-Western Columbia River Gorge.

Winter Weather Advisory until 4 AM PST Wednesday for Central Coast Range of Western Oregon-Central Willamette Valley- Coast Range of Northwest Oregon-South Willamette Valley.

WA . Winter Weather Advisory until 7 AM PST Wednesday for Central Columbia River Gorge-South Washington Cascade Foothills- South Washington Cascades.

Winter Weather Advisory until 4 AM PST Wednesday for Greater Vancouver Area-Western Columbia River Gorge.

Winter Weather Advisory until 4 AM PST Wednesday for Willapa Hills.

PZ . Gale Warning until 7 PM PST this evening for coastal waters from Cape Shoalwater WA to Florence OR out 60 NM.

Small Craft Advisory until 6 PM PST Wednesday for Columbia River Bar.



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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ASTO3 - 9439040 - Astoria, OR 17 mi413 min ENE 2.9 G 9.9 38°F 43°F998.7 hPa (-1.6)
LOPW1 - 9440422 - Longview, WA 29 mi413 min 42°F1000.6 hPa (-2.2)
46243 - Clatsop Spit, OR - 162 36 mi417 min 46°F9 ft
TOKW1 - 9440910 - Toke Point, WA 41 mi413 min ESE 18 G 23 39°F 46°F999.2 hPa (-1.5)

Wind History for Astoria, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Astoria, Astoria Regional Airport, OR24 mi58 minE 18 G 2710.00 miOvercast and Breezy37°F31°F79%992.2 hPa

Link to 5 minute data for KAST

Wind History from AST (wind in knots)
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1 day agoW6W6S5SE6W5SW6W4SE3SE5SE9CalmE5N6E5E5S3SE4CalmNE5CalmCalm4NE4E4
2 days agoSW4CalmS5SE4SE3E4SE3SE4SE6SE5SE4SE4E5SE5SE4SE5S3S8SE5NW5NW10W11
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Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
Click for Map
Tue -- 12:48 AM PST     6.82 feet High Tide
Tue -- 06:23 AM PST     3.31 feet Low Tide
Tue -- 06:30 AM PST     Moonset
Tue -- 07:43 AM PST     Sunrise
Tue -- 11:39 AM PST     8.66 feet High Tide
Tue -- 02:59 PM PST     Moonrise
Tue -- 05:11 PM PST     Sunset
Tue -- 07:34 PM PST     -0.24 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.56.86.45.64.63.83.43.54.567.58.48.686.75.13.41.90.6-0.1-0.10.82.44.3

Tide / Current Tables for Harrington Point, Columbia River, Washington
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Harrington Point
Click for Map
Tue -- 12:40 AM PST     6.23 feet High Tide
Tue -- 06:17 AM PST     3.65 feet Low Tide
Tue -- 06:31 AM PST     Moonset
Tue -- 07:43 AM PST     Sunrise
Tue -- 11:31 AM PST     8.13 feet High Tide
Tue -- 02:59 PM PST     Moonrise
Tue -- 05:11 PM PST     Sunset
Tue -- 07:28 PM PST     -0.48 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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66.25.85.24.643.73.84.767.288.17.46.14.52.91.40.3-0.4-0.30.62.24

Weather Map
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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