Friday, August18, 2017 L-36.com


Marine Weather and Tides
Klickitat, WA

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 6:04AMSunset 8:06PM Friday August 18, 2017 9:19 AM PDT (16:19 UTC) Moonrise 1:36AMMoonset 5:01PM Illumination 14% 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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7 Day Forecast for Marine Location Near Klickitat, WA
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location: 46.09, -121.02     debug


Area Discussion for - Pendleton, OR
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Fxus66 kpdt 181601 rra
afdpdt
area forecast discussion
national weather service pendleton or
900 am pdt Fri aug 18 2017

Update A flat westerly flow remains over the pacific northwest
this morning and water vapor imagery shows a weak cold front draped
across southern british columbia and the olympic peninsula. This
front will cross the area later today with the main impact being
increased pressure gradients along the cascades. This will bring 15
to 25 mph winds through the columbia gorge and cascade gaps this
afternoon and evening before dying down overnight. Elsewhere, winds
will be 5 to 15 mph. There may be some scattered higher clouds with
the front but have kept mostly clear skies for now. With higher 500
mb heights today, temperatures will be a few degrees warmer than
yesterday with highs in the upper 80s to lower 90s and mainly in the
80s in the mountains. Temperatures this morning were quite cool in
the mountains so have nudged temperatures tonight down closer to
what was seen this morning. Smoke from fires along the central
oregon cascades was significant overnight as fires remained active.

Have expanded the coverage of areas of smoke southward to include la
pine where the smoke is evident on webcams. Forecast update already
out. Perry

Fire weather A dry westerly flow last night resulted in poor to
moderate humidity recoveries for many areas. This also brought the
haines to a moderate category of 5 last night which was problematic
for nearby fires. It will be another day with afternoon humidities
ranging from 8-20 percent and a haines of 5. Another concern will
be the increasing winds this afternoon and evening. A weak marine
surge will cause winds to increase through the cascade gaps and the
eastern columbia river gorge where winds will gust to 25-35 mph late
this afternoon. Winds along the i-84 corridor from arlington to
pendleton and down along the columbia deschutes plateau will
increase as well with gusts to 25 mph in some areas. The duration
of winds and low humidity will be about 2-3 hours that will need to
be monitored closely. Because the weather pattern changes little
from now through the solar eclipse, no major changes are expected in
temperatures, humidity, and winds. Wister

Prev discussion issued 259 am pdt Fri aug 18 2017
short term... Today through Sunday night... A ridge of high pressure
will keep dry and stable conditions with warm temperatures over the
forecast area today. There will be a cold front moving in from the
north by this evening which will bring tightening pressure gradients
and a marine push of cooler air off the pacific. However, the cool
down will only be slight and the main effects will be breezy to
windy conditions through the cascade gaps and the columbia river
gorge this afternoon and evening. However the winds are neither
expected to reach advisory criteria nor is the combination of wind
and relative humidity expected to reach critical fire weather
levels. A northwest flow aloft will follow behind this cold front
for Saturday and Sunday and temperatures will be several degrees
cooler than today. Temperatures will not change much for the rest of
the short term forecast period with not much change in 850 mb
temperatures or heights. It looks to be dry and stable both Saturday
and Sunday. There will be some increase in clouds late Sunday as
another weak cold front approaches by Sunday night. These clouds
should move out to the east by Monday morning. 88
long term... Monday through Friday... A weak shortwave trough will be
exiting the forecast area by midday Monday. There could be some
scattered mid high level clouds around Monday morning, especially
over our southern washington zones... With clear skies expected
further south over much of eastern oregon. Depending on how current
wildfires progress, there could also be some patchy smoke in parts
of central oregon on Monday. Temperatures will start off in the
upper 40s to 50s most areas Monday morning, before rising into the
80s to lower 90s in the afternoon... Winds will be light, less than
10 mph. By Tuesday, the flow turns more southerly in association
with another very weak disturbance. Model guidance indicates some
marginal instability, mainly over central oregon and the southern
ochoco-john day highlands. Latest guidance seems to be keeping most
of the potential t'storm activity further south Tuesday
aftn eve... But for now followed the previous forecast to indicate a
slight chance of t'storms over the above mentioned areas. The
remainder of the forecast area remains dry on Tuesday, with very
warm temperatures. Highs will reach the lower to mid-90s in the
valleys basins, with 80s in the mountains. Heights begin to fall on
Wednesday as the next, more amplified trough approaches the pacific
northwest. Models are indicating higher levels of moisture and
instability over the eastern half of the CWA on Wednesday. As this
system moves through, expect a chance of showers, with a slight
chance of t'storms, again mainly over the eastern half of the cwa. A
few showers and perhaps a t'storms or two could linger into Thursday
as the main trough axis and associated frontal boundary move
through. Westerly winds are also likely to increase (becoming
breezy) as cold air advection develops, along with tightening
pressure gradients. Temperatures will be 5-10 degrees cooler on
Thursday. For next Friday, the latest guidance is in fairly good
agreement that the aforementioned trough will swing quickly
eastward... Leaving our forecast area under basically a zonal,
westerly flow. This should mean dry, but continued cooler weather.

Highs will only reach the lower to mid-80s... Except 70s mountains.

Overnight lows could dip into the 40s and lower 50s areawide. 77
aviation... 12z tafs...VFR conditions are forecast to continue
through the next 24 hours at all TAF sites. Skies will remain mostly
clear and winds will be AOB 12 kts through the morning hours.

Westerly winds may increase to between 10-20 kts this afternoon,
especially at kdls, krdm, kbdn and kpdt. Winds will then generally
decrease back below 12 kts into the overnight hours. There could
also be some patchy smoke around at times, but will keep vis above
7sm for now at all sites. 77 a dry westerly flow last night resulted
in poor to moderate humidity recoveries for many areas. This also
brought the haines to a moderate category of 5 last night which was
problematic for nearby fires. It will be another day with afternoon
humidities ranging from 8-20 percent and a haines of 5. Another
concern will be the increasing winds this afternoon and evening. A
weak marine surge will cause winds to increase through the cascade
gaps and the eastern columbia river gorge where winds will gust to
25-35 mph late this afternoon. Winds along the i-84 corridor from
arlington to pendleton and down along the columbia deschutes plateau
will increase as well with gusts to 25 mph in some areas. The
duration of winds and low humidity will be about 2-3 hours that will
need to be monitored closely. Because the weather pattern changes
little from now through the solar eclipse, no major changes are
expected in temperatures, humidity, and winds. Wister

Preliminary point temps pops
Pdt 89 57 86 60 0 0 0 0
alw 92 62 87 63 0 0 0 0
psc 93 58 89 57 0 0 0 0
ykm 92 55 88 59 0 0 0 0
hri 92 58 89 59 0 0 0 0
eln 87 59 83 59 0 0 0 0
rdm 91 47 84 49 0 0 0 0
lgd 90 51 83 54 0 0 0 0
gcd 90 50 85 51 0 0 0 0
dls 89 60 87 62 0 0 0 0

Pdt watches warnings advisories
Or... None.

Wa... None.

83 77 77 85


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
The Dalles Municipal Airport, WA33 mi26 minNNW 1010.00 miFair71°F55°F57%1017.4 hPa

Wind History from DLS (wind in knots)
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Last 24hrNW12NW17
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CalmW8CalmN10
1 day agoNW16
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2 days ago3NW10NW11NW7NW10NW11NW12NW12
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NW9NW6W6NW7NW10NW13NW14NW8NW9W4W9NW11
G21
W6NW10

Tide / Current Tables for Ellsworth, Washington - IGNORE HEIGHTS
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Ellsworth
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 -- 12:11 AM PDT     2.42 feet Low Tide
Fri -- 02:44 AM PDT     Moonrise
Fri -- 04:25 AM PDT     8.41 feet High Tide
Fri -- 06:14 AM PDT     Sunrise
Fri -- 01:35 PM PDT     -0.66 feet Low Tide
Fri -- 06:03 PM PDT     6.66 feet High Tide
Fri -- 06:05 PM PDT     Moonset
Fri -- 08:12 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.42.94.86.98.38.37.76.65.23.72.310-0.6-0.513.35.66.76.45.854.13.3

Tide / Current Tables for Vancouver, Washington - IGNORE HEIGHTS
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Vancouver
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 -- 02:44 AM PDT     Moonrise
Fri -- 03:59 AM PDT     8.41 feet High Tide
Fri -- 06:15 AM PDT     Sunrise
Fri -- 01:10 PM PDT     -0.66 feet Low Tide
Fri -- 05:37 PM PDT     6.66 feet High Tide
Fri -- 06:05 PM PDT     Moonset
Fri -- 08:12 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.53.65.77.68.48.17.364.63.11.70.6-0.3-0.7-01.94.46.36.66.25.54.63.73

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 Pendleton, OR (12,3,4,5)
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Ground Weather Radar Station Pendleton, OR
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weather_mapweather_map weather_map

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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.