Thursday, March23, 2017 L-36.com


Marine Weather and Tides
Yakima, WA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:56AMSunset 7:20PM Wednesday March 22, 2017 11:09 PM PDT (06:09 UTC) Moonrise 2:57AMMoonset 12:33PM Illumination 20% Phase: Waning Crescent; Moon at 25 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 230536
afdpdt
area forecast discussion
national weather service pendleton or
1030 pm pdt Wed mar 22 2017

Short term A few lingering showers over the blues and wallowa
mountains this evening. Expect these to move off to the east
within the next few hours. Satellite shows rapid clearing taking
place across much of the forecast area with westerly flow aloft
developing. Should have clear to partly cloudy skies overnight.

Areas of fog likely to develop in the columbia basin and valleys
as temperatures drop into the 30s. Weak upper ridge over the
region Thursday with partly to mostly sunny skies. The next cold
front will move through Thursday night into Friday. Models have
been consistent indicating some fairly good rainfall with this
system. This will likely cause another rise on the rivers and
streams. 94

Aviation 06z tafs. Few-sct 050 overnight. Some fog may develop
later tonight after winds diminish. Sct050 Thursday morning then
increasing mid and high level clouds in the afternoon with bkn 150-
250. Lowering ceilings by evening with light rain developing.

Prev discussion /issued 500 pm pdt Wed mar 22 2017/
short term... Tonight through Saturday... Showers and isolated
thunderstorms will continue impacting the eastern third to half of
the CWA through the early evening hours. Expect these showers/storms
to quickly taper off from west to east after sunset... And should be
exiting wallowa county between 8-10pm. Snow levels are high, near
4000 feet in washington and 5000 feet in oregon... These will fall as
the precip ends tonight. Expect minimal snow accumulations only in
the higher mountains. Later tonight dry weather will prevail with
gradually clearing skies. Temperatures will be chilly tonight and
Thursday morning... Dipping into the 30s, except 20s in the mountains
and higher valleys. Thursday will start off with mostly sunny skies
areawide, then expect some increase in mid to high level clouds
later in the day as the next weather system approaches.

Precipitation will quickly develop along the east slopes of the
cascades in the early evening hours, then spread east, across the
rest of the area overnight. Snow levels will be near 3500-4500 feet,
except 5000 feet for central oregon. Likely pops for rain and higher
elevation snow will continue through the day on Friday along with
some gusty south winds, especially in the lower grande ronde valley.

Snow levels remain nearly steady between 4000 to 5000 feet. The
precipitation tapers off from west to east Friday evening and night,
with just some lingering mountain showers. Overall, expect moderate
snow accumulations between about 4 to 9 inches for the higher
mountains, above 4000 feet in washington, and above 5000 feet in
oregon. At this time believe snow levels will be just a bit too high
to justify any winter weather headlines, but this will need to be
watched closely. Some of the higher mountain roads and passes will
see winter driving conditions during this time (santiam pass, white
pass, hwy 204 at tollgate). Precipitation amounts for the lower
elevations Thursday night through Friday will generally range from a
tenth to half inch. With this added precipitation expect some small
rises on area rivers and streams yet again... And for those already
running high, it could push them back toward action/minor flood
stage. By Saturday the area will be under a weak upper level trough,
which should support chance pops for mainly mountain showers,
especially in the afternoon. Any chance of thunder looks marginal to
non-existent at this point. Temperatures will be mild Saturday
afternoon, with highs in the mid 50s to around 60... Except 40s and
lower 50s mountains. 77
long term... Saturday night through Wednesday... An progressive
mid/upper air flow pattern through Wednesday night starts out
Saturday night with a weak, low amplitude mid/upper level trough
moving rapidly across eastern eastern or/wa Saturday night for a low
chance of showers in the blue mountains eastward to the snake river.

Daybreak Sunday will be mainly dry while a warm front approaches the
region and brings a chance of showers east of the cascades by Sunday
afternoon with snow levels rising to 4000-5000 feet in the
afternoon. Sunday night a strong cold front sweeps inland to the
cascades thus spreading showers across the forecast for showers
likely through Sunday night. The cold front then marches quickly
across the interior pacific northwest from daybreak Monday to around
midday then exits into idaho Monday afternoon resulting in
decreasing pops in the lower columbia basin, the kittitas and yakima
valleys Monday afternoon with central and north central oregon
keeping a chance of showers through Monday afternoon and showers
likely in the northern blue mountains, the wallowa mountains and the
elkhorn mountains through Monday. Monday night zonal westerly flow
aloft kicks in producing westerly downslope winds immediately east
of the cascades yielding dry conditions for lower elevations for
Monday night while a chance of orographic showers persists through
Monday night in the eastern mountains. Tuesday, during daytime, the
models part ways in terms of different solutions for mid/upper level
shortwave features with the 12z GFS run showing a longwave mid/upper
level ridge building over forecast area for dry conditions from
daybreak Tuesday through Wednesday night, whereas the 12z ECMWF run
takes a fast moving mid/upper level shortwave into the region for a
chance of showers throughout the day on Tuesday. As such confidence
in the forecast for sunup to sundown on Tuesday is not very high.

Much higher confidence for the forecast for Tuesday night and
Wednesday for mainly dry conditions as a consequence of high
pressure moving into the pacific northwest. Polan

Preliminary point temps/pops
Pdt 35 56 39 52 / 10 0 50 70
alw 38 58 42 52 / 10 0 50 70
psc 34 60 41 54 / 10 0 50 70
ykm 31 57 39 54 / 10 0 60 60
hri 34 60 40 54 / 10 0 50 70
eln 30 53 34 48 / 10 10 70 60
rdm 22 55 37 51 / 10 0 60 60
lgd 34 55 39 49 / 60 0 50 80
gcd 26 56 37 49 / 20 0 60 80
dls 38 58 41 54 / 10 10 60 70

Pdt watches/warnings/advisories
Or... None.

Wa... None.

94


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Yakima, Yakima Air Terminal, WA3 mi16 minW 710.00 miFair43°F30°F63%1015.7 hPa

Wind History from YKM (wind in knots)
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Last 24hrCalmS3E4W4SW3CalmNE3CalmCalmCalmCalmCalm6NE4S13SW16
G23
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W9W6SW6SW4W7
1 day agoW5NW4W3W3W5W5W4NW3W3W3CalmNE3CalmCalmW6SW7NW4SW3CalmSE3S4CalmCalmCalm
2 days agoW6W6W7W8W10W7W8NW10NW9N11N12N8NE9NE7NE8N5NE8N9NE7NW5W5W8W6W5

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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Weather Map
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IR Satellite Image from GEOS
west_satellite

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for Pendleton, OR (2,6,7,8)
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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.