Tuesday, May23, 2017 L-36.com

Marine Weather and Tides
Cedar Mill, OR

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 5:30AMSunset 8:46PM Monday May 22, 2017 9:55 PM PDT (04:55 UTC) Moonrise 3:00AMMoonset 3:56PM Illumination 7% Phase: Waning Crescent; Moon at 27 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- 846 Pm Pdt Mon May 22 2017
In the main channel..Combined seas 3 to 5 ft through Tuesday. However...seas to 7 ft can be expected during the strong ebb around 330 am Tuesday...and the weaker ebb around 345 pm Tuesday.
PZZ200 846 Pm Pdt Mon May 22 2017
Synopsis for southern washington and northern oregon coast.. High pres will remain over the ne pac this week. Meanwhile...a surface thermal trough along the N california and S oregon coast will shift inland through tonight. A weak cold front reaches the N waters Tue afternoon then drops S into the S oregon waters Tue night. High pres returns over the waters with gusty winds through Thursday with weaker winds Wed and lasts through at least Fri.

7 Day Forecast for Marine Location Near Cedar Mill, OR
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location: 45.58, -122.77     debug

Area Discussion for - Portland, OR
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Fxus66 kpqr 230423
area forecast discussion
national weather service portland or
922 pm pdt Mon may 22 2017

Synopsis A thermal trough will remain over the willamette valley
and cascades tonight. It then pushes east Tuesday, with resulting
onshore flow bringing much cooler temperatures. More cooling is
expected Wednesday as the upper trough moves over the area. Expect
more clouds with possibly morning drizzle and afternoon mountain
showers Wednesday and Thursday. High pressure returns Friday for
drier, sunnier and warmer weather which will persist through the
holiday weekend.

Short term Today through Thursday... It was a very warm day across
sw washington and NW oregon, with most of the interior lowlands
seeing highs into the low 90s. Not record setting temps, but not that
far off in some spots. In additon, many locations on the north coast
saw temps reach the low 80s before an afternoon seabreeze cooled
things off. The strong upper level ridge that is driving this warm
weather remains centered directly over the CWA tonight, with the low
level thermal trough now sitting over the willamette valley or the
cascade foothills. The trough won't move much overnight, which will
mean that overnight lows will be on the mild side, with some valley
spots remaining in the 60s.

An upper level trough will drop down from the gulf of alaska toward
the pac NW coast tomorrow. This will push the low-level thermal
trough east of the cascades and open the door for an onshore push of
marine air. The onshore push is modeled to pick up in the late
morning, then become fairly strong during the late afternoon and
evening. The onshore flow will bring marine stratus onto the coast
during the afternoon, then likely into much of the interior during
the evening hrs. High temps Tue are expected to be around 10 deg
cooler then today over the interior and as high as 15 to 20 deg
cooler for the coast and coast range.

The upper level trough will move onshore Tuesday night and push
through the region on wed. Expect marine stratus to fill the valley
by Wed morning. The marine layer may be deep enough for some drizzle
north of salem. An upper short wave moving over the area in the
afternoon will provide enough lift to possibly produce showers over
the higher terrain in the afternoon and evening. The cloudier skies
and a cooler airmass will result in near to slightly below normal
temperatures Wednesday afternoon.

There will be little change in the weather on Wednesday night and
Thursday as two additional shortwave troughs move over the area.

Expect another round of marine stratus on the coast at night pushing
inland in the morning. Drizzle inland is less likely on Thursday, but
mountain showers are still a possibility. The airmass warms slightly
Thursday as upper level heights try to build, and the inland
temperatures may warm into the low 70s, but the coastal temperatures
will remain near 60. Pyle/tj

Long term Thursday night through Monday. High pressure builds
Thursday night and Friday and holds over the area through Monday.

Temperatures will warm into the mid to upper 70s on Friday then to
the low 80s for the holiday weekend. A low moving across southern
california will maintain a weak surface pressure gradient across nw
oregon and SW washington and prevent a strong thermal trough from
developing. This will result in light winds that are diurnal and
terrain driven allowing some marine influence in the afternoons and
nights, which will prevent the temperatures from getting excessively
hot. ~tj

Aviation Vfr conditions inland with lifr CIGS developing
along coastal sites late tonight. Gusty north winds will continue
along the coast while inland sites will be light and variable
tonight as the thermal trough sits overhead.

Kpdx and approaches...VFR conditions through the period. /bentley

Marine High pressure over the nepac will combine with thermal
low pressure inland to continue SCA wind gusts through mid week.

A cold front is expected to drop southeast reaching the northern
waters by Tue afternoon. This will result in an increased nw
wind, but still at small craft advisory speeds. Expect wind
speeds to diminish late Wednesday, however, it may be until
Thursday night before gusts fall below 21 kts across all of the
waters. Longer range guidance shows lighter wind speeds
thereafter through the early next week.

No significant swell trains crossing through the waters which
leaves seas primarily wind wave driven. Exception may be for
several hours Tuesday night and Wednesday where fresh swell may
build combined seas above 10 ft. There is some uncertainty but
a seas may remain steep enough under short periods to justify an
advisory for square seas beginning Tuesday evening lasting well
into Thursday. Jbonk/bentley

Pqr watches/warnings/advisories
Or... None.

Wa... None.

Pz... Small craft advisory for winds until 5 pm pdt Wednesday for
coastal waters from CAPE shoalwater wa 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 38 mi38 min 56°F1016 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 61 mi38 min 52°F1016.6 hPa
ASTO3 - 9439040 - Astoria, OR 68 mi38 min E 2.9 G 4.1 67°F 59°F1016.8 hPa

Wind History for Longview, WA
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi63 minNW 510.00 miFair82°F54°F38%1014.4 hPa
Portland, Portland International Airport, OR9 mi63 minWNW 710.00 miA Few Clouds79°F53°F41%1014.5 hPa
Portland, Portland-Hillsboro Airport, OR10 mi63 minN 410.00 miFair79°F53°F41%1014.4 hPa
Scappoose, Scappoose Industrial Airpark, OR14 mi63 minNW 510.00 miFair78°F51°F39%1014.6 hPa
Portland, Portland-Troutdale Airport, OR20 mi63 minN 010.00 miFair83°F55°F38%1014.2 hPa
Aurora, Aurora State Airport, OR23 mi63 minNE 410.00 miFair82°F55°F41%1014.5 hPa

Wind History from VUO (wind in knots)
Last 24hrNW4NW4NW3CalmSE3CalmCalmCalmCalmCalmN3NW7W7W7W7NW8W9W9W9NW8NW7N9N5NW5
1 day agoNW4NW6NW6CalmCalmCalmCalmCalmCalmE3CalmNW5N4NW6NW8NW6NW10NW9NW10
2 days agoNW7NW5NW6NW7N4N7NW74N3W5NW5NW5W5NW5NW4CalmW5NW7N3436NW3NW5

Tide / Current Tables for St. Johns, Willamette River, Oregon - IGNORE HEIGHTS
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St. Johns
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

Tue -- 12:52 AM PDT     1.35 feet Low Tide
Tue -- 04:33 AM PDT     Moonrise
Tue -- 04:49 AM PDT     8.92 feet High Tide
Tue -- 05:31 AM PDT     Sunrise
Tue -- 01:50 PM PDT     0.07 feet Low Tide
Tue -- 05:39 PM PDT     7.48 feet High Tide
Tue -- 06:11 PM PDT     Moonset
Tue -- 08:44 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Vancouver, Washington - IGNORE HEIGHTS
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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

Tue -- 01:04 AM PDT     1.35 feet Low Tide
Tue -- 04:32 AM PDT     Moonrise
Tue -- 05:26 AM PDT     8.92 feet High Tide
Tue -- 05:31 AM PDT     Sunrise
Tue -- 02:02 PM PDT     0.07 feet Low Tide
Tue -- 06:10 PM PDT     Moonset
Tue -- 06:16 PM PDT     7.48 feet High Tide
Tue -- 08:44 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of PacificNorthwest    EDIT

Wind Forecast for Portland, OR (0,6,7,8)
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Ground Weather Radar Station Portland, OR
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weather_mapweather_map weather_map

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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.