Monday, April19, 2021
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Marine Weather and Tides
Troutdale, OR

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 6:14AMSunset 8:02PM Monday April 19, 2021 2:27 PM PDT (21:27 UTC) Moonrise 10:11AMMoonset 1:38AM Illumination 54% Phase: First Quarter Moon; Moon at 8 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- 253 Am Pdt Mon Apr 19 2021
In the main channel.. - general seas...2 to 4 feet through Monday night, building to 4 to 6 feet Tuesday. - first ebb...around 10 am Monday. Seas to 3 feet. - second ebb...around 11 pm Monday. Seas to 4 feet. - third ebb...around 1115 am Tuesday. Seas to 6 feet.
PZZ200 253 Am Pdt Mon Apr 19 2021
Synopsis for the southern washington and northern oregon coast.. High pressure over the coastal waters will continue through much of the week. A thermal low will persist from northern california and extend into oregon which will strengthen northerly winds Monday and persist into the middle of the week.


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 191719 AFDPQR

Area Forecast Discussion National Weather Service Portland OR 1012 AM PDT Mon Apr 19 2021

SYNOPSIS. An unusually warm and dry stretch of weather for April will likely continue for much of the upcoming week, but it is looking increasingly likely that cooler and wetter weather will arrive next weekend.

SHORT TERM. Today through Wednesday night . Water vapor satellite imagery this morning continues to show an omega block over western North America with a ridge of high pressure over western Canada. The Pacific Northwest remains near the pinch point at the bottom of the omega block as a shortwave trough over the eastern Pacific slides eastward towards the region and a shortwave trough over the Rocky Mountain states slides southward.

The aforementioned shortwave trough sliding down the Rockies pushed a dry cold front southwestward across eastern WA overnight that reached the Columbia River Gorge around daybreak. As it pushes west of the Cascades, east to northeast winds are beginning to develop in the Columbia River Gorge and across the Cascade ridgetops and should impact the northern Willamette Valley this afternoon.

Given cooler air filtering into the region, temperatures in the lower Columbia and Willamette Valleys should end up 5-10F cooler than yesterday. Nonetheless, relative humidities should once again drop into the 20-30% range this afternoon. While relative humidities and winds should reach near critical thresholds, do not foresee enough spatial or temporal coverage of both overlapping to necessitate any fire weather highlights today.

Visible satellite imagery and surface observations show plenty of marine stratus along the coast extending up the Columbia River to Kelso/Longview this morning. These clouds should push back to off the coast this afternoon.

Meanwhile, the aforementioned shortwave trough over the eastern Pacific sliding towards the region is generating enough large scale lift to produce a fairly extensive series of mid and high level cloud decks that will stream across the region this afternoon and evening. However, operational models like the NAM and GFS suggest some shallow mid level instability will transition across our southern zones late this afternoon into tonight ahead of a vort max sliding into southwest Oregon. It appears this layer of instability should be shallow enough to prevent any major thunderstorm outbreak based on model soundings. Nonetheless, wouldn't be surprised if we get a thunderstorm or two either. Will continue to monitor the latest high resolution models, satellite trends, etc. and update the forecast if necessary. Either way, more and more members of the GEFS and EPS ensemble systems produce measurable rain at KONP and KEUG this evening into tonight so PoPs have been raised slightly across Lane and Lincoln Counties. Wetting rains at any given location appear unlikely at best.

Weak shortwave ridging shifting southward across the Pacific Northwest Tuesday into Wednesday and a continuation of easterly winds at 850mb should result in temperatures warming slightly for interior locations through midweek. However, temperatures should remain short of 80F and certainly well short of any record high temperatures. Th latest high resolution model guidance suggests winds should remain below critical thresholds. The coast should remain much cooler with morning clouds and afternoon sunshine. /Neuman

LONG TERM. No Changes Previous discussion follows. Wednesday through Saturday . Little change in the forecast mid week as high pressure remains anchored over the area. The weak shortwave that passes through the high pressure ridge over the next few days should dissipate by Wednesday leaving much of the area dry. Any residual precipitation would stay isolated to the highest terrain and along the central Oregon coast. Temperatures will continue to slowly drop through the week, but should level out around 70-75 degrees throughout much of the area by Thursday. Little fluctuation is expected until then.

By Friday, the flow is trending onshore as a stronger system approaches from the Pacific. Expecting more cloud cover to fill in and overnight temperatures will be slightly warmer due to a lack of radiational cooling. This system brings an elevated chance for precipitation for on Saturday with accumulations possible. Previous model runs had this system arriving Friday night, but recent runs are showing more of a Saturday morning onset. The challenge that often comes along with spring-time systems like this is the variability. It is common that models fluctuate in the days leading up to the event, and during the frontal passage they may be more showery than stratiform. While there is a chance, confidence remains low so left PoPs around 50%. -Muessle

AVIATION. Offshore flow gradually increasing as pressure rises continue over eastern WA/OR this morning behind a dry cold front that moved into the area from the east earlier today. The offshore flow weakens later today into Tue. Meanwhile a shallow marine layer remains at the coast. Looks like low MVFR to IFR conditions will continue for the most part at the coast, but KTMK northward may break out this afternoon but return in the evening. Inland areas should remain VFR but will see stratus work it's way up the lower Columbia River to near KKLS. There is also low chances for stratus to reach KEUG Tue morning, but confidence is not high enough to include in current TAF package.

East winds 10-15 kt near the Gorge can be expected today. North winds in the Willamette Valley should picking up to around 10 kt by this afternoon then ease later this evening.

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

KPDX AND APPROACHES . VFR expected next 24 hours. However there is a 10-20 percent chance for MVFR cigs at KPDX Tue morning. East winds should pick up later this morning to around 10 kts, possibly to 15 kt, then ease this evening gradually turning to the NW.

MARINE. High pressure aloft will continue over the coastal waters bringing rather benign wave conditions through much of the week. Surface thermal low over the OR/CA border will build northward bringing stronger northerly winds across the waters. Small craft advisory winds are possible late tonight into Tuesday, mainly across the southern outer waters. Seas will build to around 7 ft Tuesday as a westerly swell moves onshore but will fall back to around 5 ft by Wednesday. Winds will shift to a southerly regime Friday night as a weak front moves onshore. Weagle/BPhillips

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 51 mi58 min 54°F1022.8 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 81 mi58 min 1024.9 hPa
ASTO3 - 9439040 - Astoria, OR 88 mi58 min WSW 1.9 G 6 54°F 54°F1023.8 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Portland, Portland-Troutdale Airport, OR3 mi35 minE 1510.00 miFair70°F37°F30%1022.7 hPa
Portland, Portland International Airport, OR13 mi35 minE 1710.00 miMostly Cloudy72°F34°F25%1022.4 hPa
Pearson Airfield, WA17 mi35 minE 11 G 1910.00 miFair71°F34°F26%1022.4 hPa

Link to 5 minute data for KTTD

Wind History from TTD (wind in knots)
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NE8CalmCalmE3E3CalmE5E4E5E3NE3CalmW3CalmNE11N8NE7NE8
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Tide / Current Tables for Vancouver, Columbia River, Washington (dubious accuracy)
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Vancouver
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Mon -- 01:05 AM PDT     1.27 feet High Tide
Mon -- 02:39 AM PDT     Moonset
Mon -- 04:20 AM PDT     0.80 feet Low Tide
Mon -- 06:17 AM PDT     Sunrise
Mon -- 07:03 AM PDT     1.05 feet High Tide
Mon -- 09:02 AM PDT     0.93 feet Low Tide
Mon -- 11:11 AM PDT     Moonrise
Mon -- 12:48 PM PDT     1.71 feet High Tide
Mon -- 05:29 PM PDT     0.41 feet Low Tide
Mon -- 06:57 PM PDT     0.47 feet High Tide
Mon -- 08:02 PM PDT     Sunset
Mon -- 09:44 PM PDT     0.18 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.31.210.80.81110.911.31.61.71.51.10.60.40.40.50.40.20.20.4

Tide / Current Tables for Tillamook, Hoquarten Slough, Oregon
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Tillamook
Click for Map
Mon -- 01:44 AM PDT     2.11 feet Low Tide
Mon -- 02:43 AM PDT     Moonset
Mon -- 06:09 AM PDT     5.25 feet High Tide
Mon -- 06:22 AM PDT     Sunrise
Mon -- 11:17 AM PDT     Moonrise
Mon -- 03:15 PM PDT     0.26 feet Low Tide
Mon -- 08:07 PM PDT     Sunset
Mon -- 09:17 PM PDT     4.29 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.52.22.12.63.64.75.25.24.84.23.52.61.710.50.30.41.12.23.23.94.34.23.8

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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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