Sunday, May20, 2018 L-36.com


Marine Weather and Tides
Stevenson, WA

Version 3.4
What's New / NOTES
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.
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.

Sunrise 5:30AMSunset 8:41PM Sunday May 20, 2018 10:45 AM PDT (17:45 UTC) Moonrise 9:54AMMoonset 12:06AM Illumination 33% Phase: Waxing Crescent; Moon at 6 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 201437
afdpqr
area forecast discussion
national weather service portland or
736 am pdt Sun may 20 2018
marine discussion updated

Synopsis Very slow changes in the overall pattern, with a broad
upper trough over the western conus. High pressure building
offshore, will return a more seasonal weather pattern, with late
night am clouds and mix of clouds and sunshine in the afternoons.

Less morning clouds are expected Monday and Tuesday for warmer
afternoons. An upper low will bring a threat for showers mid week
that will likely persist into next weekend.

Short term Today through Wednesday... An upper level short wave
approaching the oregon coast is supporting light precipitating
showers over the oregon cascades early this morning. The main upper
trough moves inland over the area today continuing the possibility
for showers. Do not expect much if any measurable rain from these
showers, but there could be a hundredth or two here and there. The
threat for showers ends tonight as the upper trough splits, and an
upper ridge noses into the pacific nw.

Dry weather is expected Monday and Tuesday as high pressure settles
over the area. Increasing n-nw flow at the lower and mid levels will
result in nighttime marine clouds along the coast moving inland up
the columbia river into parts of the willamette valley in the
mornings. Clearing in the afternoon will lead to sunshine and warming
with temperatures above the seasonal normals. Less clouds are
expected Monday night into Tuesday morning for temperatures likely
warming into the 80s Tuesday afternoon. Showers associated with a
large upper low south of the area may near the lane county cascades
late Tuesday afternoon.

An upper shortwave along the coast early Wednesday morning may result
in a weak SW marine push which may bring marine clouds from the coast
up into the south willamette valley. An upper low offshore of
california will result in diffluence over NW oregon Wednesday
afternoon favoring showers and possibly thunderstorms over the
cascades. ~tj

Long term Wednesday night through Sunday... Convective showers are
possible over the cascades Wednesday night and Thursday as an upper
low approaches northern california. Models are in decent agreement
that the upper low will move inland Friday and Saturday, but vary on
how far north the low will track. The GFS forecasts the low to move
over NW oregon and washington, whereas the ECMWF forecasts the low will
move over north california and east oregon. Both of these solutions
will support showers over NW oregon and SW washington Friday nigh,
Saturday, and possibly into Sunday. The upper low will moderate
temperatures over the weekend with afternoon temperatures likely
peaking near or just above 70 degrees. ~tj

Aviation Cigs have lowered to predominantly MVFR and should
remain there through much of this morning. Marine stratus will be
slow to break up this afternoon inland, breaking up between
19z-21z. MVFR stratus will likely hold on to the coast through
the rest of today. Could see a few light showers across the
region today.

Kpdx and approaches MVFR CIGS to hold through much of this
morning, lifting and starting to break up around 20z. ExpectVFR
conditions after 20-21z through the rest of this afternoon and
evening. -mccoy

Marine Minor update this morning to bring forecast seas
down slightly based on recent obs. Looks like seas aren't rising to
5 ft as quickly as models were indicating, so have kept them at 3 to
4 ft a bit longer. Bowen
benign conditions through the rest of today with light NW winds.

Seas are hovering around 3 to 4 ft with a mixed swell, mostly coming
from the west. The pressure gradient increases over the waters
tomorrow, with a chance for wind gusts above 20 kt Monday evening
through Tuesday. Will also see increasing westerly swell with seas
building to 6 to 8 ft midweek.

Stronger NW winds retreat farther offshore later this week,
bringing back benign conditions to our inner water zones Thursday
and Friday. Pattern change going into next weekend as a split-
flow pattern sets up over the waters. This should keep fairly
benign conditions with more westerly winds over the waters. This
will also allow seas to fall back down to around 5 to 6 ft going
into next weekend. -mccoy

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 63 mi45 min 57°F1018.3 hPa (+0.8)

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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Last 24hr24------------------------SW12
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1 day ago53------------------------322SW632SE2E21S2
2 days ago----------------------------1214334434

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

Sun -- 12:25 AM PDT     7.47 feet High Tide
Sun -- 01:08 AM PDT     Moonset
Sun -- 05:33 AM PDT     Sunrise
Sun -- 07:41 AM PDT     2.85 feet Low Tide
Sun -- 10:56 AM PDT     Moonrise
Sun -- 11:29 AM PDT     8.63 feet High Tide
Sun -- 08:34 PM PDT     -0.61 feet Low Tide
Sun -- 08:40 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.37.46.965.14.13.42.92.94.46.88.48.686.95.43.82.310-0.5-0.41.13.6

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

Sun -- 01:09 AM PDT     Moonset
Sun -- 05:34 AM PDT     Sunrise
Sun -- 07:16 AM PDT     2.85 feet Low Tide
Sun -- 10:57 AM PDT     Moonrise
Sun -- 11:03 AM PDT     8.63 feet High Tide
Sun -- 08:09 PM PDT     -0.61 feet Low Tide
Sun -- 08:40 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.57.26.55.64.73.83.22.93.35.47.68.68.47.66.34.83.21.70.5-0.3-0.602.14.6

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 (13,3,4,5)
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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.