Monday, May27, 2019 L-36.com


Marine Weather and Tides
Corvallis, OR

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 5:32AMSunset 8:48PM Monday May 27, 2019 4:44 AM PDT (11:44 UTC) Moonrise 1:43AMMoonset 12:45PM Illumination 40% Phase: Third Quarter Moon; Moon at 23 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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PZZ255 Coastal Waters From Cascade Head To Florence Or Out 10 Nm- Waters From Cascade Head To Florence Or From 10 To 60 Nm- 216 Am Pdt Mon May 27 2019
Today..W wind 5 to 10 kt. Gusts to 15 kt before Sunrise. Wind waves W 2 ft at 4 seconds. NW swell 4 ft at 9 seconds.
Tonight..NW wind 5 to 10 kt. Wind waves nw 2 ft at 4 seconds. NW swell 5 ft at 9 seconds.
Tue..NW wind 5 to 10 kt. Wind waves nw 2 ft at 4 seconds. NW swell 4 ft at 9 seconds.
Tue night..N wind 10 kt. Gusts to 15 kt in the evening. Wind waves N 2 ft at 4 seconds. NW swell 5 ft at 9 seconds.
Wed..N wind 5 to 10 kt. Wind waves N 2 ft at 4 seconds. NW swell 3 ft at 9 seconds.
Wed night..N wind 10 to 15 kt. Wind waves N 2 ft at 4 seconds. W swell 3 ft at 9 seconds.
Thu..N wind 10 to 15 kt. Wind waves 3 ft. W swell 4 ft.
Fri..N wind 10 to 15 kt. Wind waves 3 ft. W swell 4 ft.
PZZ200 216 Am Pdt Mon May 27 2019
Synopsis for the southern washington and northern oregon coast.. High pressure will remain over the offshore waters through most of the week. A trough of low pressure will develop along the north california and far south oregon coast during the second half of the week.


7 Day Forecast for Marine Location Near Corvallis, OR
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location: 44.56, -123.27     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 271025
afdpqr
area forecast discussion
weather service portland or
324 am pdt Mon may 27 2019

Synopsis Low-level onshore flow will prevail for the next several
days, keeping temperatures fairly close to normal for late may and
the first couple days of june. Night and morning low clouds will
likely clear to the coast by each afternoon. Similar to Sunday,
showers and isolated thunderstorms are expected to develop over the
higher terrain this afternoon, potentially drifting across the
willamette valley before decreasing this evening. Showers should
become less numerous Tuesday and the rest of the week.

Short term Today through Wednesday... Goes-17 water vapor imagery
shows a prominent, closed upper low encompassing much of the
southwestern united states. A weaker and smaller circulation was
drifting slowly s-sw into SW washington and NW oregon, wrapping
around the larger upper low to the south. This weaker circulation
will continue to move slowly southward across the willamette valley
and cascades, reaching southwest and south-central oregon by 00z tue
per the 06z nam.

Isolated showers persist over the forecast area early this morning.

While cooler nighttime temperatures have ended surface-based
instability, there still remains some very weak instability above
low-level inversions per the 08z hrrr. It is almost a stretch to call
this environment unstable, as MUCAPE values are generally in the
100-300 j kg range, but forecast soundings show this very weak
buoyancy extending from roughly 850 mb all the way up to the
tropopause. This is likely why shower activity has been so persistent
overnight; any showers that develop have been maintained by this weak
instability, and some continue to produce brief downpours as a
result. That said, instability this meager isn't particularly
conducive for the shower development either; it appears synoptic lift
associated with the above-mentioned weak upper level circulation may
be the initial trigger for these showers. This will likely continue
to be the case through this morning, though the overall coverage may
dwindle slightly as mountain temps cool, removing any surface-based
help for the development of these showers.

Today seems likely to be very similar to Sunday overall, though a
deepening marine layer and strengthening onshore flow will likely
come into play. With pressure gradients aligned sw-ne it's likely the
marine layer will be deepest and most persistent along the coast and
across the southern half of the forecast area. At this point, it
appears any surface-based convection across the southern half of the
cwa will be strongly capped at 4000 ft msl or so, leaving only the
cascades above that elevation to provide surface-based support for
shower thunderstorm development. It does not appear this type of cap
will be as prominent over much of the S wa cascades, and 06z nam
soundings suggest freer surface-based convection developing across
inland SW washington and potentially some parts of the pdx metro this
afternoon. There will also be a small bit of contribution to lift by
the weak upper disturbance drifting across our CWA today. Thermal
profiles seem fairly similar today as Sunday, with weak, "skinny"
cape extending all the way to the tropopause. This seems to be an
indication that, similar to the last 24 hours, any showers or
thunderstorms that develop may be long-lived as they are supported by
the weak instability aloft. Veering winds with height may also help
sustain cells that develop, and could make hail a little more likely
than it was Sunday. Steering flow gradually backs from ene early
today to more nne later this afternoon, which will gradually make it
more difficult for cascades showers thunderstorms to drift over the
willamette valley.

Shower development should gradually decrease this evening as surface
temperatures cool, again eliminating the surface-based component to
convection. Onshore flow will likely be deeper and stronger than the
past 24 hours tonight through Wednesday, likely bringing widespread
low clouds inland tonight and again Tue night. Low clouds should
generally clear back to the coast by mid-afternoon Tuesday and
Wednesday, with plenty of sunshine inland and near to slightly above
normal temps inland each afternoon. Warmer temps aloft should make
afternoon convection less prominent on Tuesday and Wednesday, though
still cannot rule out a stray shower or thunderstorm over the high
cascades. Weagle

Long term No changes. Previous discussion follows... Wednesday
night through Sunday... Ridge of high pressure to our north midweek
keeps dry, mild weather in place. We may see a stray shower or
thunderstorm near the crest of the lane county cascades Wednesday
night, or a few showers in the oregon cascades on Thursday as we get
clipped by shortwaves passing mostly to our south. Weak onshore flow
will keep temperatures fairly close to normal for this time of year.

Next weekend should start out dry and mild as high pressure sits over
the area. Sunday, a shortwave trough moves through which will
increase cloud cover and may trigger a few showers, mostly along the
coast, coast range, and in the cascades. -mccoy

Aviation Widespread low end MVFR ceilings this morning are
likely to persist through much of the day today, with a few areas
breaking up and going toVFR conditions between 18z and 02z. Clouds
then expected to fill back in along the coast after 02z, with
widespread MVFR ceilings and a few areas down into ifr flight
category. Inland areas are largely expected to remainVFR today, but
there will be areas of high end MVFR ceilings developing this
morning and persisting as late as 19z today. Expect mainlyVFR
conditions tonight. There is a slight chance of thunderstorms over
the cascades and north willamette valley between 21z and 06z.

Kpdx and approaches... Some high end MVFR ceilings were developing on
the eastern approaches early this morning, and will likely linger as
late as 19z near the gorge. OtherwiseVFR is expected to prevail
today, with just a 30 percent chance of seeing MVFR ceilings
spreading to the field between 14z and 19z today.

Marine Northwest winds expected to remain under 20 kt through
Friday as a ridge of high pressure remains offshore. In the same
time frame, expect seas to be in the range of 4 to 6 feet, dominated
by a moderately steep fresh swell.

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
SBEO3 - 9435380 - South Beach, OR 41 mi45 min W 2.9 G 5.1 54°F 55°F1016 hPa (+0.7)
NWPO3 - Newport, OR 42 mi45 min WSW 4.1 G 5.1 54°F
46050 - STONEWALL BANKS - 20NM West of Newport, OR 66 mi45 min WSW 3.9 G 9.7 1016.5 hPa (+0.6)

Wind History for South Beach, Yaquina River, OR
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Corvallis, Corvallis Municipal Airport, OR4 mi49 minWNW 310.00 miOvercast53°F51°F93%1015.7 hPa

Wind History from CVO (wind in knots)
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Last 24hrNW5N4NW4N5N5N7NE8NE8E5E6445S7S8S5NW9NW8NW9W10NW7NW7W6NW3
1 day agoCalmS5S5S4S6S6S6S8S5S3W4W5NW8NW7NW6NW5NW4W3NW3NW6NW7NW7NW7NW6
2 days agoSE5CalmS3S3S4S6S9S3NW17
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Tide / Current Tables for Toledo, Yaquina Bay and River, Oregon
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Toledo
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Mon -- 02:45 AM PDT     Moonrise
Mon -- 03:02 AM PDT     2.61 feet Low Tide
Mon -- 05:37 AM PDT     Sunrise
Mon -- 08:07 AM PDT     5.37 feet High Tide
Mon -- 01:48 PM PDT     Moonset
Mon -- 02:53 PM PDT     0.90 feet Low Tide
Mon -- 08:49 PM PDT     Sunset
Mon -- 09:40 PM PDT     6.47 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.33.52.82.62.83.54.355.45.24.63.82.71.81.10.91.22.13.34.65.76.36.46

Tide / Current Tables for Yaquina, Yaquina Bay and River, Oregon
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Yaquina
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Mon -- 02:18 AM PDT     3.06 feet Low Tide
Mon -- 02:45 AM PDT     Moonrise
Mon -- 05:37 AM PDT     Sunrise
Mon -- 07:33 AM PDT     5.46 feet High Tide
Mon -- 01:48 PM PDT     Moonset
Mon -- 02:09 PM PDT     1.05 feet Low Tide
Mon -- 08:49 PM PDT     Sunset
Mon -- 09:06 PM PDT     6.58 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.13.43.13.23.64.355.45.454.23.22.21.41.11.21.934.35.46.26.66.45.7

Weather Map and Satellite Images
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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 (7,2,3,4)
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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.