Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 191125
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
325 AM PST Thu Jan 19 2017

Updated to remove blizzard warning from headline section

.SHORT TERM...Today through Friday Night...An upper level trough
along the West Coast will weaken and move inland today and fall
apart by tonight as another trough in the eastern Pacific arrives
offshore to take its place. This will result in some showers mainly
over the mountainous terrain today tapering off this afternoon and
evening. Still expect some snow accumulations over the eastern
mountains through early today so will let the winter storm warnings
continue, otherwise will plan on letting the other highlights expire
or will cancel them shortly.

The arriving trough will spread more precipitation across the region
Friday and Friday night. This will mainly be a rain and snow event
but will need to watch closely as the cold air pool along the east
slopes of the Cascades and over the Lower Columbia Basin will
complicate the forecast. There could be a slight potential for some
freezing rain along the Foothills of the Blue Mountains and the
eastern portion of the Lower Columbia Basin by Friday night.

.LONG TERM...Saturday through Wednesday...The active weather pattern
continues through the first part of next week.  Several disturbances
will rotate around a low pressure area that remains off the coast of
Oregon for Saturday and Sunday with a mix of rain and snow. Snow
levels Saturday and Sunday will be be between 1000 and 2500 feet.
The low is expected to move south into northern California starting
Monday.  This will allow a drier northerly flow with decreasing
chances of precipitation on Tuesday.  It should be mainly dry and
cold but with areas of fog developing through the rest of the week
as high pressure builds. 93


&&

.AVIATION...12Z Tafs. IFR cigs and vsby in fog will continue at KYKM
with MVFR at KPSC and KDLS through 18z, when the winds increase
again. Elsewhere, VFR conditions should prevail with sct-bkn clouds
4000 to 5000 feet agl and showers...mainly over the mountain areas.
Winds will generally be 10-15kts.  93


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  45  30  40  29 /  30  10  30  20
ALW  47  32  42  31 /  40  10  20  20
PSC  35  27  36  28 /  10  10  30  30
YKM  36  24  34  28 /  10  20  60  60
HRI  38  28  34  28 /  10  10  30  20
ELN  34  25  33  27 /  20  30  60  60
RDM  41  23  38  24 /  10  10  60  40
LGD  35  26  31  26 /  70  10  30  30
GCD  39  26  36  24 /  40  10  60  50
DLS  34  31  34  29 /  20  20  70  60

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Winter Storm Warning until noon PST today for ORZ050-502-503.

WA...Winter Storm Warning until noon PST today for WAZ030.

&&

$$

91/93/93



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