Saturday, April29, 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 5:48AMSunset 8:10PM Friday April 28, 2017 10:27 PM PDT (05:27 UTC) Moonrise 6:51AMMoonset 10:01PM Illumination 11% Phase: Waxing Crescent; Moon at 3 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 290207
afdpdt
area forecast discussion
national weather service pendleton or
707 pm pdt Fri apr 28 2017

Short term Upper ridge offshore with dry northwest flow over
the area. Daytime cumulus is dissipating and expect mainly clear
skies overnight. Temperatures will be cool with lows in the 20s to
mid 30s. An upper level trough and frontal boundary will be
approaching the pacific northwest Saturday with increasing mid and
high level clouds. This system will move through Sat night and
Sunday morning with mostly cloudy skies and a chance of rain.

Decreasing precipitation and clouds by Sunday afternoon with
surface high pressure building back in. Westerly winds increasing
with breezy to windy conditions developing. 94

Prev discussion /issued 226 pm pdt Fri apr 28 2017/
short term... Tonight through Monday... An upper level ridge centered
offshore has expanded over the area as an upper low over the rockies
has moved south and further away from our area. A dry north to
northwest flow is over the area and skies have been clearing this
afternoon. While the mountains will remain partly cloudy this
evening, skies will be generally mostly clear with little chance of
precipitation. Breezy winds this afternoon will die down this
evening and become light overnight. This will set up good conditions
for radiative cooling but the increasing influence of the ridge will
keep temperatures from falling too far, perhaps a couple of degrees
cooler than last night with mid to upper 30s in the lower elevations
and mid 20s to lower 30s in the mountains. Tomorrow the ridge will
move overhead by the afternoon but it will be flattening as a system
rides over the ridge. Saturday should see clouds increasing in the
afternoon. A chance of showers should hold off until the evening
along the cascades and then over much of the area overnight and
Sunday morning though the columbia basin should be mainly dry. Snow
levels will be around 6000 feet so rain will be the main form of
precipitation. Rain amounts will be light with less than a tenth of
an inch in the lower elevations and up to two tenths of an inch in
the mountains. As the system clears the area Sunday afternoon,
pressure gradients will strengthen and winds will increase. Thus far
it looks like winds will be 15 to 25 mph in central oregon, 20 to 30
mph in the columbia basin and 25 to 35 mph in the columbia gorge and
kittitas valley. May need to issue a wind advisory or two for then
but will keep evaluating for now. Sunday night and Monday, the ridge
will be rebuilding offshore and the forecast area will be dry aside
from a few showers along the cascade crest. Monday afternoon,
another shortwave will move into the area with very light rain
showers mainly in the mountains. Snow levels will be at 4500-5500
feet. Temperatures Saturday through Monday will be in the mid to
upper 60s with 50s and lower 60s in the mountains. Lows Saturday
night will be in the mid 40s to lower 50s with mid 30s to lower 40s
in the mountains. Sunday night will cool to the upper 30s to mid 40s
with upper 20s to mid 30s in the mountains. Perry
long term... Monday night through Wednesday night... On Monday
evening a low amplitude shortwave trough will move quickly across
the area in NW flow aloft and may produce a few mountain rain
showers. It should be dry overnight. Tuesday through Wednesday night
a rather pronounced ridge of high pressure will build over the
western u.S. This will result in dry and warming conditions. Highs
will be around 70 lower elevations Tuesday and well into the 70s
Wednesday... With 50s/60s mountains both days. 78
Thursday morning through Saturday... There is substantial uncertainty
in the position/strength of the of the trough approaching the coast
on Thursday night. Have opted away from the operational GFS and more
toward the ecmwf/canadian solution... Which is also more in line with
the GFS ensemble mean. Instability will increase ahead of the
approaching trough as lapse rates steepen Thursday night into Friday
morning with a chance of showers and perhaps a couple of
thunderstorms especially across the eastern slopes of the oregon
cascades and southern blue mountains. On Saturday, showers will
clear the area from west to east as the trough clears the forecast
area. 74
aviation... 00z tafs...VFR conditions will prevail through the
forecast period. Few flat cumulus this afternoon will dissipate
after sunset leaving just some high clouds tonight. Winds will
decrease this evening to terrain driven at 10 kt or less overnight.

Increasing mid and high bkn-ovc CIGS are expected after 18z Saturday
as the next storm system approaches. 78

Preliminary point temps/pops
Pdt 35 63 49 63 / 0 0 30 30
alw 39 64 50 66 / 0 0 40 40
psc 35 67 50 68 / 0 0 20 10
ykm 34 63 43 64 / 0 0 20 10
hri 33 66 49 66 / 0 0 20 10
eln 35 58 42 57 / 0 0 30 10
rdm 23 63 42 59 / 0 0 20 20
lgd 30 60 44 58 / 10 0 30 40
gcd 28 61 42 61 / 0 0 20 30
dls 38 65 47 61 / 0 0 30 20

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 mi35 minNNW 510.00 miFair52°F32°F47%1024.2 hPa

Wind History from YKM (wind in knots)
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Last 24hrNW21
G28
NW11
G18
NW126
G18
NW10NW7W5W5NW43NW10NE5Calm4S4Calm5SW8SW9NW9NW10NW11NW6N5
1 day agoNW17
G26
W13
G25
NW6CalmNW6NW3W6N5CalmCalm3W12W13
G17
NW75W14
G19
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N12N9W7W7
2 days agoE85E3S4W5W5NW3S3N3CalmN7CalmE3CalmSW8W18
G24
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G30
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G32
W20
G25
W17
G26
SW12
G22
W12
G21
NW12
G19

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
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for Pendleton, OR (1,6,7,8)
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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.