Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Lake Shore, WA

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 6:16AMSunset 8:10PM Wednesday August 21, 2019 5:54 PM PDT (00:54 UTC) Moonrise 10:11PMMoonset 11:17AM Illumination 61% Phase: Waning Gibbous; Moon at 21 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- 245 Pm Pdt Wed Aug 21 2019
In the main channel.. - general seas...around 7 feet through Friday morning. - first ebb... Around 915 pm Wednesday. Seas building to 9 feet. - second ebb...around 930 am Thursday. Seas building to 9 feet. - third ebb...around 1030 pm Thursday. Seas building to 8 feet.
PZZ200 245 Pm Pdt Wed Aug 21 2019
Synopsis for the southern washington and northern oregon coast.. A front will move through the waters today bringing small craft advisory conditions to all of our waters. This front will likely move onshore by late this afternoon, with some W to nw swell lingering into Thursday.


7 Day Forecast for Marine Location Near Lake Shore, WA
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location: 45.65, -122.77     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 212143
afdpqr
area forecast discussion
national service portland or
243 pm pdt Wed aug 21 2019

Synopsis Expect near average temperatures and a mixture of clouds
and sunshine through the weekend before hotter weather returns next
week.

Short term This afternoon through Saturday... Satellite imagery
places a front across the local area from about mt. St. Helens south
southwest to the lane county coast range. Stratiform rain continues
to fall east of the front with showers developing to the west of it.

Most places have seen measurable rain today and those that haven't
will still have a chance of getting a bit with showers into this
evening. However, models agree that the highest moisture will slip
further south by 00z later this afternoon, so expect rainfall rates
to drop off quickly. Decreased pops quite a bit behind the front
this afternoon and evening, particularly in the willamette valley,
although there will still be a few showers. Continued with a mention
of showers in the cascades all the way through tonight as all of the
operational models show a non-zero chance.

The weather becomes meteorologically unimpressive Thursday as upper
ridging begins to build, returning the area to the familiar dry
august pattern. Temperatures remain below normal Thursday with the
marine layer filling the valleys Thursday morning and taking a bit to
burn off. Friday warms a little more as the ridge continues to build,
but the ridge is almost immediately then flattened by an upper trough
to the north. Models suggest the trough will swing a weakening front
into the northern part of the local area Friday night and into
Saturday morning, which could trigger some light rain along the
northern oregon and southern washington coasts, possibly even as far
inland as about longview. Kept some slight chance pops in the
forecast through Saturday afternoon in these areas to cover that
potential. Otherwise, the flattening of the ridge brings seasonable
temperatures for the first part of the weekend. Bowen

Long term Saturday night through Wednesday... The GFS and ecmwf
12z guidance are in agreement throughout the extended which gives
higher confidence for the long-term forecast. A high pressure will
build over central california Saturday night and will persist
through Wednesday. This ridge will reduce the chance of
precipitation over the forecast area. Moderate onshore flow will
keep temperatures in the low to mid 80s through Monday. However, a
thermal trough will begin to build over southeast oregon Tuesday and
will bring reduced wind speeds and higher temperatures in the low to
mid 90s Tuesday and Wednesday in the willamette valley. -bphillips

Aviation The frontal system continues to slowly move across
the area through the evening. Coastal areas currently are
experiencing ifr MVFR conditions and these conditions should
continue through Thursday morning in the post frontal air mass.

The exception to this will be at konp, in which ifr conditions
along with intermittent lifr conditions through tomorrow
morning. Inland locations should experienceVFR conditions with
intermittent MVFR conditions through the overnight hours.

Kpdx and approaches...VFR conditions should dominate along with
intermittent periods of MVFR CIGS though Thursday morning.

Marine expect winds to lessen and slowly become northwesterly
in the post frontal air mass. Small craft advisory level winds
have lessened within pzz270 and pzz275. Winds should also lessen
below advisory criteria for pzz250 and pzz255 by late this
afternoon.

Seas will remain steep through the remainder of the evening in
the inner waters but will be subsiding below 10 feet tonight.

Seas for most waters will remain around 7 to 8 feet through
Thursday. However, there is a a fresh northwest swell around 10
feet to the waters on Thursday for pzz270. A small craft advisory
has been issued starting very early Thursday morning and is
expected to last through Thursday afternoon.

A more typical summer pattern sets up Thursday into next week as
high pressure builds offshore with a thermal trough along the
northern california and south oregon coasts for predominantly
north winds.

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory from 3 am to 11 am pdt Thursday for waters
from CAPE shoalwater wa to cascade head or from 10 to 60
nm.

Small craft advisory until 5 pm pdt this afternoon for coastal
waters from CAPE shoalwater wa to florence or out 10 nm.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 33 mi55 min 71°F1015.2 hPa (-0.0)
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 61 mi55 min 62°F1016.2 hPa (-0.4)
ASTO3 - 9439040 - Astoria, OR 65 mi55 min WNW 2.9 G 8.9 64°F 69°F1015.4 hPa (+0.3)

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi62 minN 09.00 miLight Rain68°F60°F76%1015 hPa
Portland, Portland International Airport, OR9 mi62 minSSE 710.00 miOvercast69°F59°F70%1015 hPa
Scappoose Industrial Airpark, OR10 mi62 minS 68.00 miLight Rain68°F62°F81%1014.7 hPa
Portland-Hillsboro Airport, OR12 mi62 minS 610.00 miFog/Mist67°F61°F81%1014.9 hPa
Portland, Portland-Troutdale Airport, OR21 mi62 minENE 33.00 miOvercast with Haze67°F62°F84%1015.1 hPa

Link to 5 minute data for KVUO

Wind History from VUO (wind in knots)
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Last 24hr6SW7----------Calm--SE4SE4SE3----CalmSE4E5S5Calm--5SE9S7Calm
1 day agoN6NW7----------CalmCalmCalmCalmCalmCalmCalmCalmCalmE4CalmCalmSW4----5S3
2 days agoN5NW6N6NW53--NW4----NW3W3CalmCalmCalm--Calm4--SW5--NW7W96W10

Tide / Current Tables for Vancouver, Columbia River, Washington (dubious accuracy)
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Vancouver
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Wed -- 03:59 AM PDT     0.58 feet Low Tide
Wed -- 04:53 AM PDT     0.59 feet High Tide
Wed -- 06:18 AM PDT     Sunrise
Wed -- 07:43 AM PDT     0.33 feet Low Tide
Wed -- 11:50 AM PDT     1.44 feet High Tide
Wed -- 12:16 PM PDT     Moonset
Wed -- 04:03 PM PDT     0.42 feet Low Tide
Wed -- 05:56 PM PDT     0.50 feet High Tide
Wed -- 07:44 PM PDT     0.42 feet Low Tide
Wed -- 08:08 PM PDT     Sunset
Wed -- 11:10 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.61.30.90.60.60.60.50.40.30.511.31.41.20.90.50.40.50.50.50.40.611.5

Tide / Current Tables for Knappa, Knappa Slough, Columbia River, Oregon
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Knappa
Click for Map
Wed -- 12:37 AM PDT     1.04 feet Low Tide
Wed -- 06:04 AM PDT     6.18 feet High Tide
Wed -- 06:20 AM PDT     Sunrise
Wed -- 12:21 PM PDT     Moonset
Wed -- 12:31 PM PDT     0.94 feet Low Tide
Wed -- 06:17 PM PDT     7.27 feet High Tide
Wed -- 08:13 PM PDT     Sunset
Wed -- 11:13 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.11.83.24.65.76.25.95.13.92.61.6111.83.45.26.67.27.16.35.13.62.3

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Portland, OR (20,4,5,8)
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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.