Thursday, April19, 2018 L-36.com


Marine Weather and Tides
Lake Shore, WA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:14AMSunset 8:04PM Thursday April 19, 2018 2:39 AM PDT (09:39 UTC) Moonrise 8:04AMMoonset 11:26PM Illumination 16% 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- 720 Pm Pdt Wed Apr 18 2018
In the main channel..Combined seas 3 to 4 ft tonight, and 4 to 6 ft on Thu. However, seas temporarily near 5 feet during the ebb around 730 pm tonight and 8 to 9 feet during the strong ebb around 745 am Thu and the other ebb around 815 pm Thu.
PZZ200 720 Pm Pdt Wed Apr 18 2018
Synopsis for southern washington and northern oregon coast.. High pressure over the waters through early Friday. The next front moves through late Friday night. High pressure redevelops over the waters over the weekend.

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 190916
afdpqr
area forecast discussion
national weather service portland or
215 am pdt Thu apr 19 2018

Synopsis Dry and mild weather is expected today and Friday. A weak
frontal system will move across the region Friday night and Saturday
for light rain and cascade snow. Dry and mild weather returns Sunday
and Monday.

Short term Today through Sunday... Showers wrapping around an upper
low over southern california are approaching the oregon cascades from
the east early this morning. Radar imagery shows these showers are
dissipating quickly once they reach the cascades, and rainfall
measurements have been very unimpressive over the cascades so have
decreased pops.

An upper level ridge builds over the pacific NW today and holds
through Friday for dry weather, mostly sunny skies, and warming
temperatures. Some high clouds will likely move over the region late
tonight and Friday as a frontal system approaches the coast.

A warm front will move well north of the area and have little impact
Friday morning, but the cold front will bring a chance of rain Friday
evening through Saturday morning with showers possibly lingering
across extreme SW washington Saturday afternoon. The snow levels will
remain above the cascade passes most of Friday then lower to around
3500 feet Saturday morning as the rain decreases and turns to
showers. Rain and cascade snow will be on the light side with the
highest 24 hour (fri afternoon-sat afternoon) totals around 0.20
inch along the north coast, north coastal mountains, and the south
washington cascades. The greatest chances for precipitation will be
along the coast late Friday night and over the cascades Saturday
morning. The willamette valley, especially south of salem may not
see much if any rain.

Showers will end Saturday night for a dry Sunday. Dry weather is
expected Sunday with surface high pressure over the area and
low-level offshore winds. However a shortwave upper trough moving
over the area will likely keep some clouds around, and limit heating.

Inland temperatures will be around around 5 degrees above seasonal
normal (mid 60s) this weekend. ~tj

Long term Sunday night through Wednesday... An upper ridge
amplifies on Monday continuing dry weather, and raising temperatures
to near or slightly above 70, possibly resulting in the warmest
weather of the year so far. A weakening front approaches Monday night
with increasing clouds Tuesday morning, and slightly cooler
temperatures Tuesday afternoon. An upper level trough may generate
showers over the oregon cascades Tuesday afternoon with snow levels
well above the cascade passes. The forecast for Wednesday is less
certain as the models diverge on the position of an upper trough near
the region. The GFS brings the trough over the area for cloudier,
cooler and showery weather whereas the ECMWF forecasts the trough
will stay further offshore and the weather in NW oregon will be dry
and warm. Have leaned towards the ECMWF since model verification
shows that it generally out performs the GFS in long term
forecasting. ~tj

Aviation Light ese flow aloft around the upper level low that
continues to move into california. A few light showers may make
their way into the terrain of the cascades, but otherwise
mid high clouds gradually scattering will bring continuedVFR
conditions for most locations early this morning. Expect
localized areas of patchy fog low stratus 12z-16z in the cowlitz
valley and the southern half of the willamette valley as the most
favored locations. Otherwise, expectVFR under clearing skies
Thursday, though increasing mid high clouds enter the region from
the northwest again after 06z Fri ahead of the next disturbance.

Kpdx and approaches...VFR conditions expected to prevail through
the period with mid clouds continuing to scatter early this
morning. Some slight potential for some patchy fog near the
terminal between 12z and 16z. Cullen

Marine High pressure over the waters today with light north
winds continuing. The next front approaches on Friday, likely
bringing another round of advisory strength winds Friday night
through early Saturday. Strong high pressure returns over the
pacific over the weekend for a return of gusty north winds,
possibly reaching advisory criteria at times.

Seas will hold at 5 to 8 feet through early Friday, but build to
around 10 feet as the disturbance approaches Friday night early
Saturday. Seas will subside a bit later in the weekend, but
expect periods to be relatively short given the contribution from
the gusty north winds, so conditions may remain steep at times
through early next week. Cullen

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 33 mi57 min 48°F1022.5 hPa
TLBO3 - 9437540 - Garibaldi, Tillamook Bay, OR 61 mi57 min 51°F
ASTO3 - 9439040 - Astoria, OR 65 mi51 min SE 1.9 G 2.9 45°F 49°F1022.1 hPa

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Pearson Airfield, WA6 mi46 minW 310.00 miFair41°F39°F93%1021.5 hPa
Portland, Portland International Airport, OR9 mi46 minENE 310.00 miA Few Clouds47°F42°F83%1021.7 hPa
Scappoose Industrial Airpark, OR10 mi46 minNW 310.00 miFair41°F37°F89%1021.6 hPa
Portland-Hillsboro Airport, OR12 mi46 minWNW 310.00 mi44°F37°F79%1021.5 hPa
Portland, Portland-Troutdale Airport, OR21 mi46 minN 010.00 miPartly Cloudy43°F39°F89%1021.6 hPa

Wind History from VUO (wind in knots)
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Last 24hrN3CalmCalmNW3CalmNW3CalmNW6W4W7NW7S3N43NE4NE5NW8NW43CalmCalmCalmCalmW3
1 day agoSW3CalmS33CalmSW4S63SW334W14
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3SW5W9W6NW5NW3CalmCalmNE3E3CalmCalm
2 days agoSW96S8
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Tide / Current Tables for Kelley Point, Oregon - IGNORE HEIGHTS
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Kelley Point
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

Thu -- 05:20 AM PDT     1.91 feet Low Tide
Thu -- 06:18 AM PDT     Sunrise
Thu -- 09:03 AM PDT     Moonrise
Thu -- 09:22 AM PDT     9.29 feet High Tide
Thu -- 06:10 PM PDT     -0.69 feet Low Tide
Thu -- 08:02 PM PDT     Sunset
Thu -- 10:48 PM PDT     7.42 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.65.44.23.12.31.92.34.57.49.19.28.47.15.43.61.90.6-0.3-0.7-02.24.96.97.4

Tide / Current Tables for Knapp Landing, Washington - IGNORE HEIGHTS
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Knapp Landing
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

Thu -- 04:32 AM PDT     1.91 feet Low Tide
Thu -- 06:17 AM PDT     Sunrise
Thu -- 08:22 AM PDT     9.29 feet High Tide
Thu -- 09:03 AM PDT     Moonrise
Thu -- 05:22 PM PDT     -0.69 feet Low Tide
Thu -- 08:03 PM PDT     Sunset
Thu -- 09:48 PM PDT     7.42 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.54.33.22.422.14.27.29.19.28.57.25.53.72.10.7-0.2-0.7-0.31.94.76.87.47.1

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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Wind Forecast for Portland, OR (5,6,7,8)
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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.