Wednesday, February20, 2019 L-36.com


Marine Weather and Tides
Yakima, WA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:55AMSunset 5:35PM Wednesday February 20, 2019 1:57 PM PST (21:57 UTC) Moonrise 7:13PMMoonset 7:54AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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 Yakima, WA
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location: 46.61, -120.53     debug


Area Discussion for - Pendleton, OR
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Fxus66 kpdt 201744 aaa
afdpdt
area forecast discussion... Updated
national weather service pendleton or
944 am pst Wed feb 20 2019
updated aviation discussion

Update Snow showers continue across the region today with
synoptic ascent east of a n-s oriented jet and low mid level lapse
rates near 8c km. The best concentration of snow showers this
morning will be in the blue mountains and wallowa county where
north northwesterly upslope flow lingers with mostly instability
showers through this afternoon elsewhere. Showers becoming
increasingly confined to the blues overnight with a weak backdoor
cold front dropping out of montana. Should dry out through the day
Thursday with transient ridging building in ahead of the next
system that approaches Friday morning. Will maintain inherited set
of warnings and advisories and reevaluate to see if any can be
dropped with the afternoon package.

Aviation 18z tafs... Scattered snow showers will persist in
unstable conditions this afternoon at all TAF locations except ykm.

MVFR conditions are expected near showers. Occasional ifr condition
near heavier showers at alw and pdt are possible. Ifr conditions are
likely a psc until 22z in shsn and br. Ykm and dls will remainVFR
with light winds. Gradual improvement tonight as instabiity showers
decrease after sunset. Winds will generally less than 12 knots
through the period. 76

Prev discussion issued 330 am pst Wed feb 20 2019
short term... Today through Friday... A potent weather system
continues to bring a mix of lower elevation rain and snow, with
moderate to heavy snow in the northeast mountains of the forecast
area. The winds have switched to northwest in northern areas, which
is bringing in colder air now to the cwa. Precipitation in many
places that had rain earlier has changed over to light snow. The
blue mountains will continue to receive significant snow
accumulation with upslope snow showers. There is also snow over the
cascade east slopes of oregon and washington as well. This is all in
conjunction with a cold front that is dropping southward from the
north with the winds backing to the northwest. This will allow cold
air advection to take place along and north of this front for the
remainder of this current weather system. However, the back edge of
the main precipitation shield is moving across the blue mountain
foothills at this time. There may be a break in the precipitation
shortly, and then snow showers will continue in the favored upslope
areas of the blue mountain and foothills for the rest of this
morning into this afternoon. Winter storm warnings remain in effect
for the northern blue mountains through 10 pm this evening, and for
wallowa county until 4 am Thursday. Elsewhere winter weather
advisories remain in effect for the rest of the mountains, and the
foothills of the northern blue mountains through at least today.

Downslope flow over the cascades will create precipitation shadowing
over the lower columbia basin and central north central oregon as
well as the simcoe highlands. Temperatures need to lower more to
allow the snow in the lower elevations, that had rain earlier, to
accumulate. Later tonight the snow showers will decrease with
lingering light snow showers over the northeast mountains. There
will be significant wrap around snowfall also in wallowa county as
well. Due to most of the precipitation having been rain in the blue
mountain foothills, total snow amounts will be less than previously
predicted. As such have lowered the winter storm warnings to winter
weather advisories for the blue mountain foothills. There will be
drying taking place late Thursday and Thursday night with a
transient upper ridge moving across the CWA Thursday night. On
Friday the next weather system will begin to move into the
washington cascades, with mostly dry conditions elsewhere. The
models are now showing warmer conditions than previously advertised
over the CWA so the lower elevations may see mostly rain again with
this next system going into the extended forecast. However,
temperatures will still be below normal through the short term.

Winds will be rather light through the short term period. 88
long term... Friday night through Tuesday... Despite that spring
equinox is only four weeks away, winter will maintain its grip on
the pacific NW for the last week of february. This weekend, a
shortwave trough will slide south along the wa or coast and a
surface cold front associated with the system will be quasi-
stationary over the southern half of oregon from late Friday night
through early Sunday. Overall, models are in good agreement with the
front during this time so confidence is high that eastern oregon
south of condon and la grande could get a prolonged period of snow.

There is a good chance of snow north of the condon-la grande line
but snow accumulations may not be quite as significant. Although
snow levels will be down to the columbia basin floor, snow does not
look particularly promising for the washington side of the basin and
the kittitas yakima valleys.

Confidence in the deterministic models fades the remainder of the
forecast period. While the ECMWF and canadian eventually push the
quasi-stationary front south and out of the region Sunday night, the
gfs deepens the offshore low with slight ridging east of the
cascades. The GFS increases the southwest flow and forces the front
to the north back over the forecast area. Since the GFS is the
outlier, it's better to not buy its heavy precipitation pattern over
eastern oregon and far southern washington. Models continue to
diverge Monday through Tuesday with the GFS bringing the deep low
over wa or indicating continued snow at all elevations. The ecmwf
is completely different with a warm front underneath the upper level
ridge that would increase snow levels for a rain snow event. The
canadian is actually more in agreement with the gfs. The ECMWF is
now the outlier in this solution and differs significantly with the
ensemble runs. Once again, confidence is low for days 6-7 and
hopefully future models were come into better agreement. Wister

Preliminary point temps pops
Pdt 29 21 31 17 90 30 20 0
alw 30 21 32 18 80 30 20 0
psc 31 21 35 20 60 10 10 0
ykm 33 19 37 20 30 20 0 0
hri 32 22 35 19 70 20 10 0
eln 33 16 38 17 30 20 0 0
rdm 36 19 35 16 50 50 20 0
lgd 32 21 33 14 90 40 20 0
gcd 35 20 33 13 80 40 20 0
dls 40 24 40 25 50 30 10 0

Pdt watches warnings advisories
Or... Winter weather advisory until 4 pm pst this afternoon for
orz505- 506-509.

Winter storm warning until 4 am pst Thursday for orz050.

Winter storm warning until 10 pm pst this evening for orz502.

Winter weather advisory until 10 pm pst this evening for orz049-
503-507.

Wa... Winter storm warning until 10 pm pst this evening for waz030.

Winter weather advisory until 10 pm pst this evening for waz029.

Winter weather advisory until 1 pm pst this afternoon for waz520.

74 76 76


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Yakima Air Terminal - McAllister Field, WA3 mi64 minN 06.00 miOvercast with Haze30°F21°F72%1011.2 hPa

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Last 24hrSE3CalmCalmE4S4CalmCalmW4W4SW3W7SW4W4W4W4W4CalmSW3CalmCalmCalmCalmCalmCalm
1 day agoSE5S6CalmCalmCalmCalmW3W7W4W6NW4W5W7SW4W4NW3CalmCalmW4CalmW3CalmS3Calm
2 days agoCalmNE6NE6W6W4W5W4N5CalmCalmSW3W3SW3NW3W4W3W5W5W7W3CalmSE4S7S5

Tide / Current Tables for
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Tide / Current Tables for
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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 Pendleton, OR (16,3,4,5)
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Ground Weather Radar Station Pendleton, 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.