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Area forecast discussion 
National Weather Service Pendleton or
230 PM PDT Wednesday Aug 27 2014

Short term...tonight through Saturday. Dry westerly flow aloft with
clear skies this evening and tonight. A weak short wave will move
across the Pacific northwest Thursday. Mostly middle and high level
clouds. Temperatures will be 3-8 degrees cooler than today with
increasing westerly winds in the afternoon. A larger upper level
trough will move into the region Friday and Saturday. Main impacts
from this system will be a significant cooling trend. High temperatures by
Saturday will be in the 70s. Otherwise partly cloudy skies with just
a chance of showers over the Cascades. 94

Long term...Saturday night through Wednesday...models show a trough
over the area Saturday night but have backed off on the extent of
precipitation over the area and confine showers to the Cascade crest
region. Have dried out the eastern mountains and kept rain showers
mainly along the Washington Cascade crest. The trough will move off
to the east Sunday and leave US under the influence of a large ridge
of high pressure centered out in the Pacific Ocean. This will send a
dry northwest flow over the Pacific northwest through Monday night. Expect
there will be some upslope showers mainly in the Washington
Cascades while the rest of the area will remain dry. By Tuesday
models begin to show another trough moving south out of the Gulf of
Alaska. Latest runs keep the trough further north than earlier runs.
On Tuesday and Tuesday night the flow turns west to southwest as the
trough moves into British Columbia. Models are not showing much
precipitation but have continue to have a slight chance of showers
along the Washington Cascade crest. By Wednesday the European model (ecmwf) has the
trough over the Canadian rockies while the slower GFS has it further
west over western British Columbia. Models continue to look dry for
our area and have followed suit, though if the GFS is right, the
southwesterly flow may generate some mountain showers. Temperatures
will generally be in the upper 60s and 70s, though by Tuesday a few
Columbia Basin locations will warm to the lower 80s. Perry


Aviation...00z tafs...VFR conditions are expected for the next 24
hours. Skies will generally be clear though some high cirrus above
20000 feet above ground level will begin to move into the area after 10z this
evening. Winds will remain below 15 kts late this afternoon and this
evening though kdls may have some gusts to 25 kts from 21z-04z.
Winds will drop below 10 kts after 06z then begin increasing after
17z. After 20z, kdls will reach 15 to 25 kts with gusts to 30 kts
and kpdt, krdm and kbdn will reach 15 to 20 kts with gusts to 25
kts. Other taf sites will remain below 15 kts. Perry


Preliminary point temps/pops...
PDT 61 89 56 83 / 0 0 0 0
alw 64 88 61 83 / 0 0 0 0
psc 62 91 58 86 / 0 0 0 0
ykm 59 87 56 80 / 0 0 0 0
hri 61 90 57 85 / 0 0 0 0
eln 58 84 55 78 / 0 0 0 10
rdm 52 87 47 81 / 0 0 0 0
lgd 53 86 49 82 / 0 0 0 10
gcd 52 87 49 83 / 0 0 0 10
dls 63 87 59 81 / 0 0 0 10


PDT watches/warnings/advisories...

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