Tuesday, June27, 2017 L-36.com

Marine Weather and Tides
St. Helens, OR

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 5:21AMSunset 9:06PM Tuesday June 27, 2017 10:26 AM PDT (17:26 UTC) Moonrise 8:43AMMoonset 10:53PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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- 843 Am Pdt Tue Jun 27 2017
.small craft advisory for rough columbia river bar in effect Wednesday morning...
In the main channel..Combined seas 3 to 5 feet through Wednesday. However, seas will temporarily build to 7 ft during the ebb around 845 pm tonight and to 8 ft with breakers likely during the strong ebb around 845 am Wednesday.
PZZ200 843 Am Pdt Tue Jun 27 2017
Synopsis for southern washington and northern oregon coast.. High pressure persists over the ne pacific through the week and into Saturday as a thermal low remains over northern california. The seas near shore (0 to 5 nm) will likely be choppy Wednesday morning with the strong ebb. This will be the last strong ebb for a week or so.

7 Day Forecast for Marine Location Near St. Helens, OR
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location: 45.87, -122.8     debug

Area Discussion for - Portland, OR
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Fxus66 kpqr 271608 aaa
area forecast discussion
national weather service portland or
906 am pdt Tue jun 27 2017

Synopsis Dry northwesterly flow across the region persists with
broad upper level high pressure over the eastern pacific. A ridge
moves across the pacific northwest later this week, for slightly
warmer temperatures and less morning clouds across the region. A few
upper level disturbances in westerly flow may deepen the marine
layer later in the weekend, but overall seasonable weather is
expected through early next week.

Short term Today through Friday... Satellite, surface, and pilot
reports show western valleys under relatively thick marine stratus
layer this morning. Sle RAOB and pireps indicate tops between
4400-4800 feet, which is thick enough to likely persist into the
early afternoon. Expect breakout to mostly sunny skies around 21z.

Wednesday brings a a very similar day, although perhaps morning
clouds burning off an hour or two earlier. Remainder of the
discussion is unchanged. Drb
for the next few days, expect little change to the general pattern,
as a broad upper level ridge remains in place across the far
northeastern pacific and into the pacific northwest. This will
maintain the trend of morning clouds giving way to afternoon sunshine
and will maintain temperatures close to normals.

By Thursday, the offshore ridge migrates a bit closer to the region,
which will weaken the onshore surface pressure gradients. This will
ease the strength of the marine push for less widespread clouds and
somewhat warmer temperatures Thursday and Friday. Expect afternoon
highs in the lower 80s across the interior lowlands and in the mid
60s along the coast. Cullen

Long term Friday night through Tuesday... Weak onshore low-level
flow continues over the weekend, maintaining cool and generally
cloudy conditions along the coast. Expect that the onshore gradient
will be insufficient for widespread marine stratus intrusion into the
interior. Thus, abundant sunshine and a slightly warmer air mass will
push afternoon temperatures into the lower to mid 80s across the
willamette valley. There is general agreement among the model
guidance that a series of shortwave disturbances will track into
southern british columbia or western washington over the weekend and
early next week. The first is expected to arrive late Saturday or
early Sunday, though some differences remain with respect to the
strength and placement of the impulse. Nevertheless, expect that it
will be close enough to the forecast area to bring a stronger onshore
gradient, more widespread cloud cover, slightly cooler temperatures,
and perhaps some light precipitation to the region. The subsequent
shortwave likely follows a similar track and moves into the pacific
northwest around Monday. Therefore, expect little change, with rather
seasonable temperatures and morning clouds giving way to afternoon
sun for the extended holiday weekend. Cullen

Aviation Marine stratus is deeper today than what was observed
24 hours ago and there is widespread MVFR this morning. A pirep
over ksle early this morning reported a stratus thickness around
2600 feet, which will result in a later inland clearing today.

Expect the willamette valley to clear around 21 or 22z (mid
afternoon). With persistent onshore winds and extensive stratus
offshore do not think the coast will clear today or tonight.

Models hint that the CIGS will lower to under 1000 feet along
the coast tonight. A shortwave upper trough moving over the area
tonight will maintain a deep marine layer with MVFR marine
stratus moving inland into the willamette valley early Wednesday

Kpdx and approaches... Based from a ksle pirep think MVFR cigs
will lift toVFR between 20 and 22z (mid afternoon), with skc by
00z Wednesday (late this afternoon). Marine stratus will return
MVFR CIGS very early Wednesday morning (11-13z). ~tj

Marine A persistent surface pressure pattern with high
pressure over the NE pacific and a thermal low in northern ca
will result in little changes to the overall marine weather for
the rest of this week and into the weekend. N-nw winds will
mostly remain below 25 kt, although there will be a few gusts
around 25 kt in the waters beyond 20 nm this afternoon and

A combination of wind wave and fresh swell will create choppy
seas with heights 5 to 8 feet and dominant periods around 8
seconds today and Wednesday. There is also a very small long-
period (~14 second) s-sw swell. A strong ebb Wednesday morning
may steepen the seas nearshore (0-5 nm) a few hours around the
845 am ebb. A weak low moving across the gulf of alaska Wednesday
night and Thursday will increase wave periods to around 10
seconds beginning early Thursday. ~tj

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory for rough columbia river bar from 8 am to
11 am pdt Wednesday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 18 mi38 min 64°F1018.5 hPa
ASTO3 - 9439040 - Astoria, OR 56 mi38 min SW 4.1 G 5.1 59°F 65°F1018 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 63 mi38 min 58°F1018.7 hPa

Wind History for Longview, WA
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Scappoose Industrial Airpark, OR8 mi33 minN 010.00 miOvercast59°F50°F72%1018.1 hPa
Southwest Washington Regional Airport, WA18 mi30 minVar 410.00 miOvercast59°F48°F69%1019.2 hPa
Pearson Airfield, WA19 mi33 minVar 410.00 miOvercast60°F51°F72%1018.1 hPa
Portland, Portland International Airport, OR21 mi33 minVar 310.00 miOvercast60°F48°F67%1018.1 hPa
Portland-Hillsboro Airport, OR24 mi33 minVar 310.00 miOvercast59°F51°F75%1018 hPa

Wind History from SPB (wind in knots)
Last 24hrN93N6S63E8N5W9
1 day agoE43E4E4E44N11NW7NW10
2 days agoN4CalmN5N4NE6E5E7NE5NE5N5NW3CalmW4W4W4W4NW3CalmCalmW3CalmCalm--Calm

Tide / Current Tables for Saint Helens, Oregon - IGNORE HEIGHTS
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Saint Helens
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 -- 04:03 AM PDT     2.14 feet Low Tide
Tue -- 05:23 AM PDT     Sunrise
Tue -- 07:34 AM PDT     8.99 feet High Tide
Tue -- 09:43 AM PDT     Moonrise
Tue -- 04:47 PM PDT     -1.27 feet Low Tide
Tue -- 09:03 PM PDT     8.03 feet High Tide
Tue -- 09:05 PM PDT     Sunset
Tue -- 11:52 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Kalama, 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 -- 03:14 AM PDT     2.14 feet Low Tide
Tue -- 05:22 AM PDT     Sunrise
Tue -- 06:57 AM PDT     8.99 feet High Tide
Tue -- 09:43 AM PDT     Moonrise
Tue -- 03:58 PM PDT     -1.27 feet Low Tide
Tue -- 08:26 PM PDT     8.03 feet High Tide
Tue -- 09:06 PM PDT     Sunset
Tue -- 11:53 PM PDT     Moonset
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 (13,3,4,5)
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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.