Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 241030
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
230 AM PST Sat Feb 24 2018

.SHORT TERM...Today through Sunday night...A system embedded
within the northwesterly upper level flow will move across the WA
and OR today. This system will will intensify as it moves into the
base of the trough. Heaviest snowfall will be along the Cascade
crest, the Blue Mountains, and Central to northeast OR. Upslope
effects will enhance snowfall in the northern Blue mountains. Snow
accumulations in the Blue mountains are expected to run 9 to 12
inches by late Saturday above 4500 feet, with lesser amounts below
that level. A winter storm warning has been issued for locations
above 4500 feet in the Blues, with an advisory at lower levels. Snow
accumulations along the Cascade east slopes, especially near the
crest, so the advisories along the Cascade east slopes will
continue. Advisories have also been issued for many other locations
in OR. Snow accumulations in the Columbia Basin and adjacent valleys
will be light with some locations below 1500 feet changing to rain
or mixed rain and snow. Winds will increase over parts of the area
this afternoon, reaching 20-30 mph with higher gusts. Isolated to
scattered snow showers will persist tonight across the Cascades and
Central to northeast OR due to the upslope effects in the persistent
northwest upper level flow. Another system will move across eastern
WA and OR with more snow early Sunday, then taper off Sunday night.
Winds will remain breezy/windy at times Saturday and Sunday as
stronger winds aloft mix to the surface. Coonfield

.LONG TERM...Monday through Friday. Active weather pattern will
continue next week as several more systems move across the Pacific
northwest. Extended models have also come into better agreement
for the later portion of the week as an upper low moves through.
For Monday an upper level trough will be exiting the region with
decreasing precipitation and clouds during the day. Another system
will quickly follow on Tuesday with a northwest flow aloft. For
Wednesday through Friday the region will be under the influence of
a slow moving upper level low. Based on the number of systems
moving across the forecast area expect precipitation every day.
Freezing levels indicate the mountains will receive all snow with
the mid and lower elevations having a mix of snow and rain. High
temperatures will be mostly in the 30s and 40s. Lows in the 20s
and 30s. Occasional breezy to windy conditions expected with south
to southwest winds. 94

&&

.AVIATION...12z tafs. Weather system moving across the region will
bring occasional snow or mixed rain and snow to the taf sites over
the next 24 hours. Ceilings will be mainly 030-070 with occasional
ceilings at 020 in precipitation. Visibility reduced at times in
snow to 2-5sm. West to southwest winds 10-25kt.  94

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  40  31  44  27 /  70  20  50  40
ALW  41  33  47  29 /  70  20  70  50
PSC  46  34  50  30 /  30  10  30  20
YKM  45  29  47  25 /  20  10  40  30
HRI  46  34  48  30 /  40  10  40  30
ELN  40  27  42  23 /  50  20  50  30
RDM  35  24  42  19 /  80  20  80  80
LGD  33  25  37  20 /  90  30  90  70
GCD  31  22  39  20 /  90  40  80  80
DLS  45  34  46  27 /  70  20  90  60

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Winter Weather Advisory until 4 PM PST this afternoon for ORZ049-
     050-502-505-506-509-511.

     Winter Storm Warning until 4 PM PST this afternoon for ORZ502.

WA...Winter Weather Advisory until 4 PM PST this afternoon for WAZ030-
     520.

     Winter Storm Warning until 4 PM PST this afternoon for WAZ030.

&&

$$

76/94/94



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