Area Forecast Discussion
Issued by NWS Pendleton, OR

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885
FXUS66 KPDT 241803
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
1000 AM PST Sat Feb 24 2018

.SHORT TERM...Morning Update...The latest system continues to move
across the region into the Great Basin. The system`s cold front and
associated steady snow has exited most of the area, with precip now
mainly showery in nature. Can expect varying coverages of showers
through the rest of today with highest coverages over the Blue,
Wallowa and Strawberry mountains. Will continue the current
highlights, though snow accumulations will become increasingly
spotty this afternoon. Snow levels have risen or will rise to
between 1300 and 2000 feet today. Thus the lower elevations will see
mainly rain showers this afternoon. Winds have been increasing
behind the front and expect sustained winds between 15 and 30 mph
today. Made adjustments to some of the shower coverages, a few high
temps and winds for updates this morning. 90

.LONG TERM...Previous Discussion...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.

&&

.AVIATION...18Z TAFs...The upper level trough and cold front has
swept across most of the forecast area.  Cloud bases and the
visibility have fluctuated significantly with the passage of the
front. In addition, winds have increased and shifted directions. All
of these changes have made for challenging TAFs.  If landing or
departing at our surrounding terminal airports, be prepared for wind
shifts and increasing winds as well as the possibility of sudden
flight rule changes over the next several hours.  Aviation
conditions have stabilized to VFR at KPSC and KYKM.  Other TAF sites
will return to VFR around 21Z-00Z.  It will be breezy for most sites
for the next 24 hours with winds shifting to the S-SW overnight.
Wister

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  41  31  44  27 /  60  20  50  40
ALW  42  33  47  29 /  70  20  70  50
PSC  46  34  50  30 /  20  10  30  20
YKM  45  29  47  25 /  20  10  40  30
HRI  46  34  48  30 /  30  10  40  30
ELN  40  27  42  23 /  40  20  50  30
RDM  36  24  42  19 /  80  20  80  80
LGD  33  25  37  20 /  90  30  90  70
GCD  34  22  39  20 /  90  40  80  80
DLS  45  34  46  27 /  60  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.

&&

$$

90/94/85



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