Sunday, August9, 2020
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Marine Weather and Tides
Stevenson, WA

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 6:02AMSunset 8:27PM Sunday August 9, 2020 12:43 AM PDT (07:43 UTC) Moonrise 10:24PMMoonset 11:04AM Illumination 72% Phase: Waning Gibbous; Moon at 20 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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7 Day Forecast for Marine Location Near Stevenson, WA
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location: 45.68, -121.9     debug


Area Discussion for - Portland, OR
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FXUS66 KPQR 090418 AAA AFDPQR

Area Forecast Discussion . UPDATED National Weather Service Portland OR 918 PM PDT Sat Aug 8 2020

Updated aviation discussion.

SYNOPSIS. Warmer weather and more sun returns Sunday and Monday as a weak ridge of high pressure moves across the Pacific Northwest. Milder temperatures then follow for the rest of the coming week as a weak upper level trough slowly moves through.

SHORT TERM. Tonight through Tuesday . Still some marine clouds were seen in visible satellite pictures early Saturday afternoon over the northern and coastal parts of the forecast area. Water vapor pictures showed the upper trough crossing the Cascades and moving east. Models remain in good agreement showing a weak ridge aloft passing over the region Sunday and Sunday night, while a thermal induced surface trough along the south Oregon coast turns the low level flow more northerly. Resulting low level drying will likely limit most of the low level clouds to coastal areas through Sunday night while temperatures begin to warm again.

Monday onshore flow begins to strengthen again late in the day as the upper flow flattens out and heights slowly fall. The strengthening onshore flow though is likely to kick in too late to have much of an impact on inland temperatures beyond the lower Columbia valley, as model 850 mb temperatures still peak on Monday in the range of 16C to 18C, enough to carry high temperatures in the upper 80s, with a couple of 90F readings still possible especially in the south Willamette Valley. Monday night and Tuesday will bring a return of marine air for cooler temperatures closer to the seasonal normals.

LONG TERM. Tuesday night through Saturday . Models in general agreement in showing a broad upper trough moving across the Pacific Northwest during the coming week. Overall impressions are that the trough is not likely deep enough to bring much of a threat of showers to the region, but low level onshore flow will bring some diurnal clouds mainly to the coast and north interior along with temperatures a little cooler than normal through the end of the week. 12Z EC operational run is most bullish on showers Thursday into Thursday night, and given some support from some ensemble members, will keep a slight chance for showers then over southwest Washington. Friday into Saturday models have generally push the trough off to the east with some ridging aloft following it, so expect dry weather with warming temperatures.

AVIATION. Conditions remain mainly VFR with clear to mostly clear skies throughout the area. Similar to last evening, continued onshore flow may create some lower level marine clouds overnight. 2000 to 3000 ft clouds will likely only become overcast along coastal areas, while inland areas will see more of a scattered layer. In general though, any MVFR reduction will likely be concentrated along the coast. The north-northwesterly winds have created quite gusty conditions throughout the forecast area with gusts up to 25 kt observed along the coast and up to 20 kt through the Willamette Valley. Winds should weaken overnight as the thermal gradient decreases. Another chance for visibility reduction due to haze overnight near KONP.

See a return to VFR clear skies and gustier winds in the afternoon after 20Z Sun.

KPDX and APPROACHES . No concerns. VFR through the next 24 hours with northerly winds. Gusty winds should dissipate overnight increasing again in the afternoon with daytime heating. -Muessle

MARINE. High pressure continues across the waters through early next week with an thermally induced trough developing over the far south Oregon coast through Sunday. North winds will increase to 15 to 25 kt with gusts up to 30 kt and seas 7 to 10 feet at 13 seconds this afternoon. Gusts of 30 kt possible south of Cascade Head, with these higher gusts becoming more prevalent with daytime heating. Nearshore winds will be strongest through Saturday and Sunday afternoon and evening, but will likely drop below 20 kt during the night and into the morning hours.

Small craft conditions will likely persist into early next week. Will see winds weaken with gusts to 25 kt Monday afternoon before easing below small craft criteria Tuesday morning. Seas will remain elevated, but will start to subside by Wednesday.

The remainder of next week looks to be rather benign with seas around 4 to 6 ft and gusts below 15 kt. /42

PQR WATCHES/WARNINGS/ADVISORIES. OR . None. WA . None. PZ . Small Craft Advisory until 3 PM PDT Monday for coastal waters from Cape Shoalwater WA to Cascade Head OR out 60 NM.

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



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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 63 mi55 min 71°F1023.9 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for KCZK

Wind History from CZK (wind in knots)
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Last 24hr24------------------------SW12
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SW6W6----SW65SW5
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1 day ago53------------------------322SW632SE2E21S2
2 days ago----------------------------1214334434

Tide / Current Tables for Vancouver, Columbia River, Washington (dubious accuracy)
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Vancouver
Click for Map
Sun -- 06:04 AM PDT     Sunrise
Sun -- 07:37 AM PDT     0.33 feet Low Tide
Sun -- 11:40 AM PDT     1.44 feet High Tide
Sun -- 12:07 PM PDT     Moonset
Sun -- 04:02 PM PDT     0.53 feet Low Tide
Sun -- 04:53 PM PDT     0.53 feet High Tide
Sun -- 07:45 PM PDT     0.27 feet Low Tide
Sun -- 08:26 PM PDT     Sunset
Sun -- 11:26 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.310.80.80.70.60.40.40.611.41.41.20.80.60.50.50.50.30.30.50.91.4

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
Click for Map
Sun -- 12:49 AM PDT     1.38 feet Low Tide
Sun -- 06:06 AM PDT     6.30 feet High Tide
Sun -- 06:06 AM PDT     Sunrise
Sun -- 12:11 PM PDT     Moonset
Sun -- 12:46 PM PDT     0.79 feet Low Tide
Sun -- 06:38 PM PDT     7.07 feet High Tide
Sun -- 08:31 PM PDT     Sunset
Sun -- 11:29 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.61.423.34.75.86.36.15.242.71.610.81.42.84.566.976.55.44.12.9

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

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Wind Forecast for Portland, OR (3,6,7,8)
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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.