Friday, August18, 2017 L-36.com


Marine Weather and Tides
Westport, 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 6:14AMSunset 8:15PM Friday August 18, 2017 8:44 PM PDT (03:44 UTC) Moonrise 1:45AMMoonset 5:10PM Illumination 10% Phase: Waning Crescent; Moon at 26 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- 328 Pm Pdt Fri Aug 18 2017
.small craft advisory for rough columbia river bar in effect from 2 am pdt Saturday through late tonight...
In the main channel..Combined seas 4 to 5 ft tonight and Sat. However, seas will temporarily build to around 6 ft during the ebb around 3 pm this afternoon, and to 8 or 9 ft with breakers during the strong ebb around 315 am early Saturday morning, and to around 6 ft during the ebb around 345 pm Sat afternoon.
PZZ200 328 Pm Pdt Fri Aug 18 2017
Synopsis for southern washington and northern oregon coast.. High pres will persist over the coastal waters through early next week with thermal low pres mainly over nw ca which will maintain northerly winds along the coast, strongest in the central oregon waters.

7 Day Forecast for Marine Location Near Westport, OR
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location: 46.15, -123.31     debug


Area Discussion for - Portland, OR
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Fxus66 kpqr 182105
afdpqr
area forecast discussion
national weather service portland or
205 pm pdt Fri aug 18 2017

Synopsis Onshore winds continue the next several days. Slight
variations of the upper level pressure pattern will result in slight
variations in how expansive nighttime morning clouds will be through
early next week. The clouds should clear in the afternoons with
temperatures remaining near or above the seasonal normals. An upper
level ridge is expected early next week for less clouds and slightly
warmer temperatures. An upper level trough will bring a return slight
cooling, and possibly some showers late in the week.

Short term Tonight through Monday... The tail end of a weak cold
front will clip extreme SW washington and NW oregon this evening,
maintaining cloudy conditions for the coast and possibly producing
patchy drizzle or fog along the immediate coast. An upper level
trough over the area will result in a relatively deep marine layer
that will allow the marine clouds to seep inland through the coastal
gaps late tonight filling in parts of the willamette valley Saturday
morning. Clearing Saturday afternoon will result in near normal
afternoon temperatures (inland low 80s).

There will be little change Saturday night and Sunday as another weak
upper level trough moves over the area. One change will be a lack of
a surface front Saturday night near the washington and oregon coast.

There is a warm front, but it is far north of the portland forecast
area. So one difference in the forecast is there is no threat for
coastal drizzle or fog Saturday nigh and Sunday morning.

The more pressing concern for the short term forecast is the sky
forecast for Monday morning near the time of the solar eclipse
totality. The clouds are as tricky to forecast this day as any, with
the biggest challenges revolving around determining how widespread
the coastal clouds will be, and how far inland they will reach.

An upper level ridge builds Sunday night and Monday morning indicating
that the marine layer will be shallow, and limit the cloud ceiling
bases, and how far they can move inland. However, the 12z models
show a weak upper level shortwave sneaking in under the ridge near
the time of the eclipse. They also show a surface front over the ne
pacific. The models vary on the position and strength of this upper
wave, but seem to agree that any precipitation with the surface front
will remain well offshore.

However, clouds ahead of the front will likely move in along the
coast Sunday night and Monday morning, and some of the models are
forecasting light rain or drizzle associated with these clouds along
the coast. I doubt that any precipitation will materialize from these
clouds, but this indicates that there will be an increase of
low-level moisture.

An increase of low-level moisture may allow more clouds to develop
inland early Monday morning than we previously thought, mainly along
the SW washington and north oregon cascade foothills. There is a
chance that these clouds will expand with north winds steering them
south into parts of the central willamette valley. These
possibilities are not fully in the forecast yet, but it is a
possibility, and has decreased the forecast confidence for clear
skies in the willamette valley during the time of the eclipse.

The main reason this possibility is not in the current forecast, is
that the weather pattern expected for Sunday night and Monday is
almost identical to what we had last night (Thursday night) and this
morning (Friday). The clouds were persistent on the north coast this
morning, but the central oregon coast was clear. The clouds moved
inland up the lower columbia river briefly impacting kelso and
portland mid morning. Since the current weather pattern is so similar
to Monday's, the clouds Monday morning will likely match what
happened this morning.

The best option for clear skies Monday morning continues to be east
of the cascades pending areas near fires where smoke may be a
nuisance. ~tj

Long term Monday night through Thursday... An upper level trough
approaches Monday night and Tuesday from the NW enhancing the upper
ridge over the region. Meanwhile, an upper low settles over central
california. This will result in above normal afternoon temperatures
with possibly some cascade showers in the afternoons. The trough will
move through Wednesday and Thursday and possibly bring a surface cold
front with it. Cooler temperatures with increasing chances for rain
is therefore expected late next week. ~tj

Aviation MVFR CIGS will tend to persist near kast this
afternoon, then spread southward with patchy drizzle along the
coast tonight and Saturday morning, possibly lowering to higher
end ifr in spots. Expect conditions to lift toVFR Saturday
afternoon on the central coast but may be slow to improve near
kast until late. Inland will beVFR through this evening but then
become MVFR after midnight tonight except perhaps lowering to
MVFR prior to midnight near kkls. Conditions in the inland
valleys will be mostly MVFR Saturday morning before becomingVFR
in the afternoon.

Kpdx and approaches...VFR the remainder of this afternoon and
this evening. MVFR CIGS may return not too far after 08z-10z
tonight and continue through the morning before becomingVFR by
the afternoon. Pt

Marine Expect a rather persistent pattern through early next
week with high pressure over the coastal waters and thermal low
pressure over NW california and SW oregon. This will maintain
northerly winds, with gustier winds in afternoon evenings,
primarily to south of newport. A SCA for winds is now in effect
from this afternoon through Sat night for the central oregon
coastal waters. The winds may ease a bit Sunday and Sunday night
then increase again Monday afternoon.

Seas will generally be around 5 to 6 ft through the period, but
may build to around 7 or 8 ft at times to south of newport with
the stronger north winds. Pt

Pqr watches warnings advisories
Or... None.

Wa... None.

Pz... Small craft advisory for winds until 5 am pdt Sunday for
coastal waters from cascade head or to florence or out 60
nm.

Small craft advisory for rough columbia river bar from 2 am to
5 am pdt Saturday.

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
LOPW1 - 9440422 - Longview, WA 19 mi44 min 72°F1020.8 hPa (-0.0)
ASTO3 - 9439040 - Astoria, OR 25 mi44 min WNW 6 G 9.9 64°F 71°F1021.8 hPa (-0.3)
46096 43 mi74 min WNW 5.8 G 5.8 56°F 62°F1022.5 hPa
46243 - Clatsop Spit, OR - 162 44 mi44 min 60°F4 ft

Wind History for Longview, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Southwest Washington Regional Airport, WA22 mi48 minWNW 810.00 miOvercast68°F59°F73%1021.4 hPa

Wind History from KLS (wind in knots)
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Last 24hr5NW55CalmNW4CalmN3NE3CalmCalmCalmN43W5W6W6NW7W7W10
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1 day agoNW545NW3W43--W8W4N7CalmCalmN3W33W644CalmW10W9W8W5NW8
2 days agoW54CalmCalmNW3CalmCalmCalmCalmCalmNW4N3N445N6W75W6W8W7NW10W10
G15
W8

Tide / Current Tables for Eagle Cliff, Washington - IGNORE HEIGHTS
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Eagle Cliff
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

Fri -- 02:45 AM PDT     Moonrise
Fri -- 06:16 AM PDT     Sunrise
Fri -- 08:33 AM PDT     -0.66 feet Low Tide
Fri -- 01:35 PM PDT     6.66 feet High Tide
Fri -- 06:09 PM PDT     Moonset
Fri -- 08:16 PM PDT     Sunset
Fri -- 08:18 PM PDT     2.23 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.48.17.15.74.12.61.20.1-0.6-0.50.72.74.96.46.66.15.34.33.42.72.32.64.16.2

Tide / Current Tables for Skamokawa, Steamboat Slough, Washington - IGNORE HEIGHTS
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Skamokawa
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

Fri -- 02:45 AM PDT     Moonrise
Fri -- 06:16 AM PDT     Sunrise
Fri -- 07:17 AM PDT     -0.66 feet Low Tide
Fri -- 12:48 PM PDT     6.66 feet High Tide
Fri -- 06:11 PM PDT     Moonset
Fri -- 07:02 PM PDT     2.23 feet Low Tide
Fri -- 08:17 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
8.27.25.84.12.51-0.1-0.6-0.40.92.84.86.26.66.25.34.33.32.62.22.84.36.27.8

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

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for Portland, OR (23,6,7,8)
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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.