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FXUS66 KPDT 202105
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
205 PM PDT Fri Oct 20 2017

.SHORT TERM...Tonight through Monday...Weather pattern will be very
active and complex over the coming days. An upper level trough over
the region will be pushing off to the east overnight with showers
associated with it coming to an end. This will be followed quickly by
a warm front moving into the forecast area on Saturday. It will
arrive in central Oregon before sunrise and then spread
precipitation north and east across the forecast area through the
morning. Snow levels will begin around 4000 feet Saturday and then
rise through the day and overnight. Accumulating snow above 4000
feet has warranted the issuance of winter weather advisories through
the day and into the evening. Will also see increasing southerly
winds associated with the warm front through the day and the become
southwesterly overnight. Wind advisories will be issued when the
afternoon forecast goes out.

A moist westerly flow will continue into Sunday mainly impacting the
Cascades and eastern Mountains with some continuing precipitation
but snow levels will be around 7000 feet. A flash flood watch has
been issued for the Jolly mountain and Norse Peak fire burn areas as
two to four inches of rainfall is expected by Sunday. A ridge of
high pressure will begin to build into the region from the west
which will bring precipitation to an end Sunday night.

.LONG TERM...Monday night through Friday. High pressure will be
building into the region Monday and Tuesday with drier northwest
flow. Under the ridge, there may be some fog development in the
lower basin areas along the rivers during the early morning hours. A
frontal system will be moving through the area Wednesday with some
rain for the Cascades and a slight chance over the mountains of
northeast Oregon. Behind this system, the models are coming into
agreement on stronger northerly flow and cooler air spreading into
the area from the north as high pressure builds offshore.
Temperatures will be above seasonal averages Tuesday and Wednesday
and then cool to below normal through the rest of the week. 93


&&

.AVIATION...00z. Strong winds 15-30kts will continue through the
evening decreasing to 5 to 15kts after midnight. Winds will
increase again after 18z to 15-20kts. A warm front will be pushing
into area between 6-9Z with bkn ceilings lowering to be 040-050k
feet and light rain through the day Saturday. 93


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT 41 59 53 68 / 10 100 70 40
ALW 44 56 53 69 / 20 100 100 50
PSC 43 58 53 69 / 10 90 60 20
YKM 37 53 48 65 / 10 100 70 20
HRI 42 60 53 69 / 10 90 40 20
ELN 36 49 44 60 / 10 100 90 20
RDM 36 60 46 63 / 70 90 20 20
LGD 38 50 44 56 / 30 100 90 70
GCD 36 51 47 58 / 30 100 50 40
DLS 43 59 54 67 / 40 100 70 60

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Wind Advisory from 5 PM Saturday to 8 AM PDT Sunday for ORZ507-
508-510-511.

Winter Weather Advisory from 8 AM to 11 PM PDT Saturday for
ORZ050.

Winter Weather Advisory from 5 AM to 11 PM PDT Saturday for
ORZ502.

Winter Weather Advisory from 5 AM to 5 PM PDT Saturday for
ORZ503-506.

Wind Advisory from 1 PM to 11 PM PDT Saturday for ORZ049.

WA...Wind Advisory from 5 PM Saturday to 8 AM PDT Sunday for WAZ521.

Winter Weather Advisory from 5 AM to 11 PM PDT Saturday for
WAZ030.

Flash Flood Watch from Saturday morning through Sunday morning
for WAZ520.

&&

$$

91/93/93
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