Area Forecast Discussion
Issued by NWS Pendleton, OR
FXUS66 KPDT 181114
Area Forecast Discussion
National Weather Service Pendleton OR
313 AM PST Wed Jan 18 2017
.SHORT TERM...Today through Thursday night...The latest Pacific
system continues to move into and through Pacific Northwest. The
system`s warm front and associated precip is now affecting Union and
Wallowa counties only. This warm front should exit the area within
the next couple of hours. A secondary disturbance is moving through
western Oregon and Washington at the moment, and should move through
the region during the morning period. Will still see freezing rain
at areas in the basin below around 1800 feet over in the east and
below around 2500 feet in the west. Thus the various advisories and
warnings for ice and sleet will continue across the basin this
morning. Precip across the basin looks to be on track to decrease by
noon. Precip will continue over the higher terrain into tonight.
Snow levels will lower late today through tonight. Thus the threat
of freezing precip in the mountain zones will end as snow becomes
the main precip type. Winds in the Grande Ronde valley remain quite
strong and may have to extend the warning beyond 7 AM. Elsewhere
local winds around 30 mph sustained should persist along the base of
the northern Blue mountains in Umatilla county. Will have to watch
for the potential of an advisory in this area. Still expect the warm
air to mix into the Basin and eventually into the Yakima and
Kittitas valleys, as well as the Gorge this afternoon, but will have
to keep some mention of light freezing rain in these areas. Should
see precip chances continue to decrease late tonight through
Thursday evening. Snow levels will gradually fall through this
period as well. 90
.LONG TERM...Friday through Wednesday...GFS/EC models in agreement
with active pattern through the weekend and then drier northerly
flow followed by ridge of high pressure for Tuesday and Wednesday.
Negative tilt trof will rotate multiple disturbances across the
inland northwest Friday through Monday. Precipitation will be
likely in most areas of central oregon. Snow levels will range
between 1500 and 2500 feet and then drop Monday as a colder
northerly flow returns. By
this time, however, the trof will have moved east and the northerly
flow will be drier. Look for temperatures to be near seasonal normal
through Monday and then 5 to 10 degrees below normal for Tuesday and
.AVIATION...12z tafs...mvfr conditions will prevail for KYKM, KPSC,
KPDT, KDLS, KALW through 18z and then gradually improve. Fzra will
will gradually change over to ra across the northern taf sites, but
it may not be until after 18z at KYKM and KDLS.
.PRELIMINARY POINT TEMPS/POPS...
PDT 41 34 42 29 / 80 70 30 10
ALW 44 35 42 31 / 80 80 40 10
PSC 38 33 41 29 / 80 60 10 10
YKM 37 28 41 25 / 70 50 10 10
HRI 39 33 42 28 / 70 60 20 10
ELN 34 27 39 26 / 80 60 10 20
RDM 49 29 41 24 / 70 50 20 20
LGD 37 31 40 28 / 100 80 60 20
GCD 44 34 42 24 / 90 60 50 20
DLS 39 33 43 31 / 90 70 30 20
OR...Winter Weather Advisory until 10 AM PST this morning for ORZ507-
Ice Storm Warning until 6 PM PST this evening for ORZ041.
Winter Weather Advisory until 6 AM PST Thursday for ORZ505.
Winter Storm Warning until noon PST Thursday for ORZ502-503.
Winter Storm Warning until 4 PM PST Thursday for ORZ050.
Winter Storm Warning until 6 AM PST Thursday for ORZ506.
High Wind Warning until 7 AM PST this morning for ORZ049.
Wind Advisory from 7 AM this morning to 4 AM PST Thursday for
Blizzard Warning until noon PST Thursday for ORZ049.
Ice Storm Warning until 10 AM PST this morning for ORZ044.
WA...Winter Weather Advisory until 10 AM PST this morning for WAZ029.
Ice Storm Warning until 6 PM PST this evening for WAZ024-026-027-
Winter Storm Warning until noon PST Thursday for WAZ030.
Ice Storm Warning until 6 AM PST Thursday for WAZ520.
Ice Storm Warning until noon PST today for WAZ028.