Saturday, November18, 2017 L-36.com


Marine Weather and Tides
Stevenson, WA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:13AMSunset 4:36PM Saturday November 18, 2017 5:22 PM PST (01:22 UTC) Moonrise 7:08AMMoonset 5:14PM Illumination 0% Phase: New Moon; Moon at 0 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 182203
afdpqr
area forecast discussion
national weather service portland or
202 pm pst Sat nov 18 2017

Synopsis The upcoming week looks unsettled and wet. A weak upper
ridge will be over the pacific northwest today into early Sunday for
drying and stable conditions and for areas of persistent valley fog
and low clouds. The next system will slowly spread a front onshore
later Sunday and Sunday night for more rain and mountain snow, with
the lowest snow levels in the south washington cascades. The front
weakens later Monday then lifts north as a warm front for more rain
Monday night into Tuesday, but with rising snow levels. The warm
front will linger across the north part of the forecast area the
remainder of Tuesday and Wednesday. The next cold front moves through
on thanksgiving. A little drying early next weekend will be followed
by more precipitation the second half of next weekend.

Short term Tonight through Tuesday... The models show a weak upper
ridge has moved into the pacific northwest today that will continue
over the area tonight into early Sunday. This will bring dry weather
over southwest washington and northwest oregon into Sunday, though
accompanied by stable conditions that will be conducive to fog and
low cloud formation, especially in the valleys. There is not much
surface pressure gradient this afternoon either, so the valley fog
and low clouds, especially south of portland, will be slow to clear
this afternoon and fairly quick to return tonight.

The stable conditions will lead to more fog and low clouds in the
valleys tonight and Sunday morning. The light offshore gradient
through the gorge this morning that helped keep parts of the the
portland and vancouver metro areas free of fog will be gone tonight
and Sunday morning so more of the valley areas should see some fog
and low clouds tonight and Sunday morning.

Attention then turns towards the next approaching frontal system. It
should start to spread some precipitation onshore in the north later
on Sunday, then slowly sag south for more substantial rain Sunday
night into Monday. The front moves enough to reduce the threat of any
significant flooding. The front will also be accompanied by some
strong south winds ahead of the front, especially along the coast,
but some breezy conditions inland as well. Snow levels may be low
enough for a while in the south washington cascades that could
produce some decent snows above about 4000 feet or so Sunday night
before snow levels rise even there.

After the front weakens and stalls near lane county Monday afternoon,
it lifts north through the forecast area Monday night and then stalls
across the north part of the area Tuesday, especially affecting areas
north of salem with more rain.

All in all, Sunday night through Tuesday look wet and unsettled.

Tolleson

Long term Tuesday night through Saturday. Models in some
disagreement for this time period. The warm front from Tuesday
lingers some and lifts a little north Wednesday for some
precipitation around, followed by the main front moving through on
thanksgiving for a decent shot of rain. After some lingering shower
Friday with snow levels trying to stay above the passes, there could
be a little drying early next weekend before the next system
approaches. Bishop tolleson

Aviation An ifr deck will likely persist into this evening across
the central and southern willamette valley. Locations that have
improved toVFR on the edges of this stratus deck will likely
deteriorate rapidly back down into lifr and ifr conditions this
evening. There is a decent chance these conditions will also spread
into the pdx metro area as well. A band of rain associated with a
front dropping southeastward towards the region will bring gradual
flight deteriorations late Sunday.

Kpdx and approaches... Expect primarilyVFR conditions through this
evening, but high clouds upstream look thin enough that we some ifr
and MVFR restrictions may develop towards 09-15z Sunday. Neuman

Marine A strong front is still on track to spread gale force wind
gusts of 40 to 45 kt across the waters Sunday and Sunday night. Winds
will increase first across the outer waters late tonight, but these
stronger winds will be slower to spread into the inner waters and
likely not arrive until Sunday morning or midday. Left the timing of
the gale warning intact for all zones, but there is a decent chance
it will need to be extended past Sunday evening as latest model
guidance suggests gale force winds will continue past 10 pm,
particularly across the central oregon waters. In addition, coastal
jet development will likely enhance winds within 20 nm of the coast,
and we could see some storm force gusts of 50 kt within this region.

Confidence is low enough at this point that will continue to mention
the possibility in the forecast, but continue with a strongly worded
gale warning.

Either way, seas appear likely to top out near 20 ft, possibly a
touch higher briefly, Sunday evening. The aforementioned front is
forecast to stall out near the central oregon coast late Sunday night
or early Monday morning before lifting back northward on Monday. When
it does so, expect high end small craft advisory to low end gale
force southerly wind gusts of 30 to 35 kt to spread northward across
the waters. This should also result in seas climbing well into the
teens once again early next week where they look to linger through at
least thanksgiving. Neuman

Pqr watches warnings advisories
Or... High wind watch from Sunday afternoon through late Sunday night
for central oregon coast.

High wind watch from Sunday morning through late Sunday night
for north oregon coast.

Wa... High wind watch from Sunday morning through Sunday evening for
south washington coast.

Winter storm watch from Sunday evening through late Sunday
night for south washington cascades.

Pz... Gale warning from 1 am to 10 pm pst Sunday for waters from cape
shoalwater wa to florence or from 10 to 60 nm.

Small craft advisory for rough columbia river bar from 3 pm to
6 pm pst Sunday.

Small craft advisory for rough columbia river bar from 3 am to
6 am pst Monday.

Gale warning from 10 am to 10 pm pst Sunday for coastal waters
from CAPE shoalwater wa to florence or out 10 nm.

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

Wind History from CZK (wind in knots)
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1 day ago53------------------------322SW632SE2E21S2
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Tide / Current Tables for Ellsworth, Washington - IGNORE HEIGHTS
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Ellsworth
Click for MapNote: The Columbia River is subject to annual freshets. Short range predictions are available at local river forecast centers. The data for stations above Harrington Point apply only during low river stages. There is a tidal influence along most of the

Sat -- 03:09 AM PST     -0.34 feet Low Tide
Sat -- 03:42 AM PST     New Moon
Sat -- 07:10 AM PST     Moonrise
Sat -- 07:14 AM PST     Sunrise
Sat -- 07:26 AM PST     7.81 feet High Tide
Sat -- 02:57 PM PST     2.28 feet Low Tide
Sat -- 04:36 PM PST     Sunset
Sat -- 05:16 PM PST     Moonset
Sat -- 06:58 PM PST     9.21 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.51.10.1-0.30.52.95.77.67.77.26.35.24.13.22.52.33.45.98.29.28.97.96.54.9

Tide / Current Tables for Vancouver, Washington - IGNORE HEIGHTS
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Vancouver
Click for MapNote: The Columbia River is subject to annual freshets. Short range predictions are available at local river forecast centers. The data for stations above Harrington Point apply only during low river stages. There is a tidal influence along most of the

Sat -- 02:44 AM PST     -0.34 feet Low Tide
Sat -- 03:42 AM PST     New Moon
Sat -- 07:00 AM PST     7.81 feet High Tide
Sat -- 07:10 AM PST     Moonrise
Sat -- 07:14 AM PST     Sunrise
Sat -- 02:32 PM PST     2.28 feet Low Tide
Sat -- 04:36 PM PST     Sunset
Sat -- 05:17 PM PST     Moonset
Sat -- 06:32 PM PST     9.21 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.90.6-0.2-0.31.44.16.77.87.56.85.84.73.72.92.42.54.478.99.18.57.35.84.2

Weather Map and Satellite Images
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Weather Map
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IR Satellite Image from GEOS
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GOES Local Image of PacificNorthwest    EDIT
Geos

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.