Wednesday, May23, 2018 L-36.com


Marine Weather and Tides
Altoona, WA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:27AMSunset 8:49PM Wednesday May 23, 2018 5:29 PM PDT (00:29 UTC) Moonrise 1:34PMMoonset 2:04AM Illumination 67% Phase: Waxing Gibbous; Moon at 9 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- 221 Pm Pdt Wed May 23 2018
In the main channel..Combined seas 4 to 6 ft through Thursday. However, seas will temporarily build to near 7 ft during the ebbs, which will occur around 130 am Thursday, 145 pm Thursday and 230 am Friday.
PZZ200 221 Pm Pdt Wed May 23 2018
Synopsis for the southern washington and northern oregon coast.. High pressure over the northeast pacific and lower pressure over northern california will maintain northerly winds over the waters for much of the next week.

7 Day Forecast for Marine Location Near Altoona, WA
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location: 46.27, -123.65     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 232143
afdpqr
area forecast discussion
national weather service portland or
242 pm pdt Wed may 23 2018

Synopsis An approaching large scale upper trough off the coast is
resulting in southerly flow aloft over southwest washington and
northwest oregon, producing a deepening marine layer near the coast
that extended into the south willamette valley this morning, and
spreading moisture and instability northward along the cascades. The
pattern will not change much on Thursday except the onshore flow and
marine layer will take a greater hold on the inland valleys. The
whole trough pattern moves onshore Friday, maintaining the deep
marine layer with a few showers especially over the cascades, but
pushing the threat of thunder east of the cascades. Onshore flow will
continue Saturday, then a return to dry and slightly above normal
daytime temperatures can be expected Sunday into early next week with
a more seasonal night and morning clouds regime. The next weak upper
trough is expected mainly after Monday.

Short term Tonight through Saturday... A pretty decent large scale
high amplitude upper trough was out near 135w and slowly approaching
our forecast area this afternoon. This has resulted in a decent
marine layer along the coast that reach the south willamette valley
this morning. This has also resulted in a southerly flow aloft that
was spreading moisture and instability north along the cascades. We
have already seen several lightning strikes in the south washington
cascades, near and south of mount hood, near mount jefferson, and
near willamette pass.

The thermal trough is still hanging on around portland, and 850 mb
temps suggest we will still reach 80 to 85 today before the marine
air spreads into this area this evening. We earlier bumped up
afternoon temps near portland and vancouver as a result. The other
impact of the warmer temps is that the models show some precipitation
around portland late in the day that is likely the result of the
models trying to develop some convection in the area late in the day.

Have added some small pops around portland in the evening as a
result.

The offshore trough gets closer to the coast on Thursday, with a low
developing on the southern end that will be heading into california.

This should help the marine air to move into all of the western
valleys tonight and Thursday. The models suggest some drizzle along
the coast late tonight and Thursday morning from the good marine
layer. There is some southeast flow aloft north of the developing
upper low that is moving toward california, but this is mostly into
southwest oregon. The flow aloft turns more southwesterly in
northwest oregon and the bulk of the precipitation and convection
will likely be in the cascades on Thursday. The models are in good
agreement with this so will continue with the adjustments made to the
forecasts this morning.

On Friday, the southern low makes its move into california, with the
northern piece of the offshore upper trough starting to move into the
pacific northwest. This will maintain the onshore flow and marine
layer over the area. The unstable lifted indices are east of the
cascades, so the threat of any thunder looks pretty minimal Friday,
though some showers are still possible over the cascades in the flow
northward out of the california low. The models show some significant
rains moving northward but most of this looks to be in central
oregon.

Good onshore flow continue Friday night and Saturday as the whole
pattern and the california low move inland and eastward. The models
show some drizzle or light showers along the coast spreading inland
along the columbia river late Friday night and into Saturday and have
some low pops for that. Tolleson

Long term Saturday night through Wednesday... The models are in
good agreement with a positive tilt upper ridge over the pacific
northwest Sunday in the wake of the system moving eastward from
Saturday, with the pattern continuing into Monday. The net result is
afternoon sunshine after areas of night and morning low clouds. Temps
will likely trend back toward or perhaps slightly above normal. The
models then show a weak trough moving through after that, the ecmwf
possibly getting it here late on memorial day and Tuesday with the
gfs focusing on Tuesday and Wednesday. This will increase the onshore
flow and marine layer again, with some spotty precipitation possible.

Tolleson

Aviation Increasing onshore flow this afternoon will result in
marine clouds and MVFR CIGS along the coast pushing inland this
evening. Most of the willamette valley should have MVFR CIGS spread
overhead between 06-12z Thursday, which should then persist through
~18-20z Thursday.

Kpdx and approaches... Increasing onshore flow will result inVFR
conditions giving way to MVFR CIGS around 09-12z Thursday. These
lower flight conditions should persist through ~18-20z Thursday.

Neuman

Marine High pressure over the northeast pacific and lower pressure
over northern california will maintain northerly winds across the
waters for much of the next week. As a result, seas should generally
remain in the 4 to 7 ft range. Winds may increase a bit early to mid
next week, which could result in seas climbing into the 7 to 10 ft
range and becoming particularly steep and hazardous, but confidence
is low. Neuman

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
ASTO3 - 9439040 - Astoria, OR 8 mi42 min W 2.9 G 8.9 59°F 61°F1012.2 hPa
46243 - Clatsop Spit, OR - 162 26 mi30 min 59°F6 ft
TOKW1 - 9440910 - Toke Point, WA 35 mi42 min WNW 8 G 13 58°F 61°F1012.4 hPa
LOPW1 - 9440422 - Longview, WA 39 mi42 min 58°F1009.5 hPa
46029 - COL RIVER BAR - 20NM West of Columbia River Mouth 45 mi40 min WNW 12 G 14 56°F 58°F7 ft1012.9 hPa (+0.0)53°F

Wind History for Astoria, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Astoria, Astoria Regional Airport, OR14 mi35 minW 99.00 miOvercast59°F52°F78%1012.2 hPa

Wind History from AST (wind in knots)
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Last 24hrNW15NW14
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1 day agoNW12NW13
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NW14NW11NW5CalmCalmS3CalmSE3SE5CalmSE3SE3CalmNW5NW7N8NW8N9NW11NW12NW11
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2 days agoNW12NW12NW10NW9NW8N8N8N6N6N6CalmCalmN5N4CalmNW7N4N5N6N6N10NW14NW16NW13
G20

Tide / Current Tables for Harrington Point, Columbia River, Washington
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Harrington Point
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Wed -- 03:04 AM PDT     Moonset
Wed -- 04:06 AM PDT     2.03 feet Low Tide
Wed -- 05:33 AM PDT     Sunrise
Wed -- 09:22 AM PDT     6.18 feet High Tide
Wed -- 02:33 PM PDT     Moonrise
Wed -- 04:28 PM PDT     0.32 feet Low Tide
Wed -- 08:50 PM PDT     Sunset
Wed -- 10:29 PM PDT     7.32 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.44.33.22.422.43.34.55.56.16.15.44.33.11.910.40.51.42.94.66.27.27.2

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
Click for Map
Wed -- 03:04 AM PDT     Moonset
Wed -- 04:12 AM PDT     1.92 feet Low Tide
Wed -- 05:33 AM PDT     Sunrise
Wed -- 09:30 AM PDT     6.77 feet High Tide
Wed -- 02:33 PM PDT     Moonrise
Wed -- 04:34 PM PDT     0.45 feet Low Tide
Wed -- 08:49 PM PDT     Sunset
Wed -- 10:37 PM PDT     7.88 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.94.63.42.41.92.23.34.65.96.76.76.14.93.62.31.20.60.51.434.86.57.77.8

Weather Map and Satellite Images
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wmap_P
GOES 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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Wind Forecast for Portland, OR (20,4,5,8)
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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 numerious 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.