Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 172332
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
333 PM PST Fri Nov 17 2017

Updated Aviation Discussion

.SHORT TERM...Tonight through Sunday night...An upper level ridge
will build over the Pacific Northwest this evening. This upper ridge
will remain over the region Saturday and Saturday night. The ridge
will be low amplitude, thus varying amounts of mid and high level
cloudiness will persist over the region through Saturday night. The
least amount of cloudiness will be over central and east-central
Oregon, with these areas seeing the coldest overnight low temps
tonight and Saturday night. Lingering showers over the area (mainly
over the mountains) late this afternoon will continue to decrease
through tonight. Conditions will be mainly dry Saturday and Saturday
night. Breezy to locally windy conditions this afternoon will end
this evening. Locally breezy southerly winds are expected to develop
over our eastern zones Saturday afternoon and Saturday night. A
disturbance will break down the upper ridge Sunday and then swing
into the region Sunday night. Initially, should see some light
precip over the Washington Cascade east slopes Sunday morning. This
precip will gradually shift across the entire area late Sunday
afternoon and Sunday night. Snow levels will initially be low Sunday
morning, but are expected to rise rapidly late Sunday afternoon and
Sunday evening. Thus expect to see only limited snow accumulations
below 5000 feet through Sunday night. 90

.LONG TERM...Monday through Friday. Models are now in better
agreement...and the ECMWF is more in line with the GFS in terms of
the warm temperatures and high snow levels during the mid week.
Wednesday and Thanksgiving Day could be about 10-15 degrees above
seasonal average with temperatures in the upper 40s to mid 50s in
the mountains and mid 50s to mid 60s elsewhere. Periods of rain and
high elevation snow will occur...particularly on Monday and Tuesday
when a few embedded waves in a moist southwest flow aloft track
across the region. Snow levels on Monday and Monday night will range
from 3000 feet over south central Washington...5000 feet over
southeast Washington and northeast Oregon...and 6000 feet over
central Oregon. Snow levels will rise an additional 1000-2000 feet
on Tuesday then snow levels will be as high as 10,000 feet Wednesday
through Thanksgiving Day. No major wind concerns are expected...but
there will be occasionally gusty south-southwest winds. Wister

&&

.AVIATION...00Z TAFs. Winds are decreasing at this hour and will
diminish overnight to light and terrain-driven winds. On
Saturday...winds will be less than 10 knots. Skies are mostly clear
with SCT stratocumulus and altocumulus clouds.  High level cirrus
will increase tonight and Saturday morning...preventing radiational
fog from developing.  From sunrise Saturday through 00Z/19th...BKN-
OVC cirrus clouds are expected.  Wister

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  34  51  30  55 /   0   0   0  10
ALW  36  52  34  57 /  10   0   0  10
PSC  34  51  29  53 /   0   0   0  10
YKM  28  51  27  49 /   0   0   0  20
HRI  32  51  28  53 /   0   0   0  10
ELN  31  48  28  45 /  10   0   0  30
RDM  19  49  22  52 /   0   0   0   0
LGD  28  46  30  51 /  10   0   0   0
GCD  28  46  29  50 /  10   0   0   0
DLS  36  53  32  51 /  10   0   0  20

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
&&

$$

90/85/85



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