Saturday, August17, 2019 L-36.com


Marine Weather and Tides
Scappoose, OR

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:13AMSunset 8:18PM Saturday August 17, 2019 6:19 AM PDT (13:19 UTC) Moonrise 8:41PMMoonset 7:11AM Illumination 96% Phase: Waning Gibbous; Moon at 17 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- 213 Am Pdt Sat Aug 17 2019
In the main channel.. - general seas...around 4 ft today through early Sunday. - first ebb...around 630 am today, with seas near 7 ft. - second ebb...around 7 pm today, with seas near 7 ft. - third ebb...around 7 am Sunday, with seas near 7 ft.
PZZ200 213 Am Pdt Sat Aug 17 2019
Synopsis for the southern washington and northern oregon coast.. High pres will remain anchored over the offshore waters. Meanwhile, thermal low pres will sit over nw california and far sw oregon. This will maintain light to moderate northerly winds through Mon. Bit of change next week, as the high shifts inland as low pres approaches from the west. Will see a weakening front push across the region later Tue into Wed.


7 Day Forecast for Marine Location Near Scappoose, OR
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location: 45.7, -122.87     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 170930
afdpqr
area forecast discussion
national service portland or
213 am pdt Sat aug 17 2019

Synopsis Expect a gradual increase in temperatures and a decrease
in morning clouds through Tuesday before temperatures cool during the
latter half of next week with the possibility of some light rain.

Short term Today through Tuesday... Water vapor satellite imagery
reveals a large rex block over the gulf of alaska early this morning.

This continues to place the pacific northwest under deep
northwesterly flow. A shortwave trough is currently skirting the
pacific northwest as it moves eastward across canada. This should
continue to aid in marine clouds congealing across the lowlands of
northwest oregon and southwest washington this morning. It should be
noted that a weak surface ridge extends eastward into the southern
willamette valley so it remains unclear if marine clouds will fill in
across the lower elevations of benton, linn and lane counties this
morning. Either way, expect another cool day with temperatures
topping out several degrees below average for the date.

A weak shortwave trough will hang over the pacific northwest Sunday
and Monday, which should allow temperatures to warm across the
region, but only gradually. This appears likely to change as we head
into Tuesday when models are in good agreement shortwave ridging
will build northward across the rocky mountain states. This should
result in high temperatures climbing into the upper 80s or low 90s
across the willamette valley and columbia river gorge on Tuesday.

Neuman

Long term Tuesday night through Friday... Models remain in
agreement shortwave ridging over the rocky mountain states will slide
eastward midweek. This will open the door for a shortwave trough to
move into british columbia Tuesday night and Wednesday. The uncertain
part of the forecast is whether or not this upper level trough will
help a decaying, but moist front to move into the region. Between
timing differences and whether or not the front will hold together
enough to bring rain to the region, have kept slight chance to chance
pops in the forecast for the Wednesday & Wednesday night time
periods. Thereafter, zonal flow should keep temperatures in check
late next week. Neuman

Aviation Moderate to strong northwesterly onshore flow today
into tonight. At 2 am, widespread stratus, generally 2500 to
3500 ft, extends along the coast, and inland north as far south
as salem. Southward progression of clouds over interior has
slowed, but still think will spread south to cover most of the
region as far south as cottage grove by daybreak. Band of mid and
high clouds over washington will spread south over the stratus
at moment, and into northern oregon this am. This deck will
gradually thin this afternoon. As a result of the high clouds,
stratus breakup will be slow, even though it lifts to lowVFR by
late morning. Breakup timing likely 20z to 22z along the coast,
and 22z to 00z inland. As has been the case, stratus will erode
from south to north.

Kpdx and approaches... Stratus over region through much of today,
with variable mid and high clouds above the stratus. Overall,
stratus sits as lowVFR, but will have MVFR CIGS around 2500 ft
between 12z and 17z today. Clouds will gradually scattered after
23z, but MVFR stratus returns after 10z sun. rockey

Marine No change in overall pattern. High pressure will remain
over the offshore waters, with thermal low pressure over nw
california and far SW oregon. Gradients not all that strong along
the coast between north bend and astoria, keeping northerly winds
at 10 to 15 kt. Seas stay in the 4 to 7 ft range, with highest
seas on the washington waters.

Little change into next week, though may see bit stronger winds
in the afternoons evenings south of newport as the gradient
increases a bit. Interestingly, fairly strong low will push out
of the north pac and into northwest british columbia. This low
will push a front across the coastal waters on wed, with some
potential of 15 to 20 kt southerly winds. rockey

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 28 mi49 min 72°F1016.6 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 56 mi49 min 57°F1017.2 hPa
ASTO3 - 9439040 - Astoria, OR 59 mi49 min WNW 4.1 G 9.9 62°F 70°F1016.4 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Scappoose Industrial Airpark, OR5 mi86 minN 010.00 miOvercast63°F54°F73%1016.4 hPa
Portland-Hillsboro Airport, OR12 mi86 minN 010.00 miOvercast61°F53°F75%1016.7 hPa
Pearson Airfield, WA12 mi86 minESE 310.00 miOvercast61°F57°F87%1016.8 hPa
Portland, Portland International Airport, OR16 mi86 minESE 410.00 miLight Drizzle61°F57°F87%1016.7 hPa

Link to 5 minute data for KSPB

Wind History from SPB (wind in knots)
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Last 24hr----CalmCalm3SE4E6--E5--NW12
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--W4NW3--CalmCalmCalm
1 day agoCalmW3CalmN5N6NW6NW63NE73--N9N9----N6N7NW5------CalmCalm--
2 days agoCalmCalmCalm3E33E5E7N65N11N8N10NW10
G17
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NW7N8NW6NW7N5NW8NW6N4Calm

Tide / Current Tables for Vancouver, Columbia River, Washington (dubious accuracy)
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Vancouver
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Sat -- 04:39 AM PDT     0.31 feet Low Tide
Sat -- 06:13 AM PDT     Sunrise
Sat -- 08:11 AM PDT     Moonset
Sat -- 08:51 AM PDT     1.67 feet High Tide
Sat -- 05:04 PM PDT     -0.17 feet Low Tide
Sat -- 08:15 PM PDT     Sunset
Sat -- 09:38 PM PDT     1.45 feet High Tide
Sat -- 09:39 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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110.90.70.40.30.61.11.51.71.51.10.80.70.60.30-0.2-00.511.41.41.2

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
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Sat -- 03:22 AM PDT     7.57 feet High Tide
Sat -- 06:15 AM PDT     Sunrise
Sat -- 08:13 AM PDT     Moonset
Sat -- 10:36 AM PDT     -0.42 feet Low Tide
Sat -- 04:24 PM PDT     7.04 feet High Tide
Sat -- 08:20 PM PDT     Sunset
Sat -- 09:43 PM PDT     Moonrise
Sat -- 10:45 PM PDT     1.36 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.35.16.67.57.46.55.13.41.80.5-0.3-0.30.62.44.466.96.96.14.83.52.31.61.4

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Portland, OR (9,2,3,4)
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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.