Area Forecast Discussion
Issued by NWS Pendleton, OR

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950
FXUS66 KPDT 180340
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
840 PM PDT Wed Oct 17 2018

.UPDATE...High pressure will continue to dominate the areas
weather with dry conditions into tomorrow. Temperatures were
adjusted some due to the slower decent and sky cover was reduced.
With the clear skies and calm winds patchy fog could develop along
and near the columbia river overnight. Otherwise low temps are
expected to dip mostly into the 30s with low 40 except in the 20s
across the higher elevations.

&&

.AVIATION...vfr conditions will persist at all taf sites for the
next 24 hours.

&&

.PREV DISCUSSION... /issued 210 PM PDT Wed Oct 17 2018/

SHORT TERM...Tonight through Saturday...The strong upper-level
ridge over the Pacific NW will flatten a bit tonight and tomorrow
and will allow for some high cirrus to creep down into the
region from the north. The ridge axis amplifies back over the
area tomorrow night/Friday and remain planted over the Pacific NW
through Saturday and bring and bring clear skies. Persistent
ridging will help strengthen and lower the subsidence inversion
associated with the high pressure. This will result in more
warming in the higher elevations than at the low elevations as
some cool air remains trapped beneath the inversion. Temps will
climb a few degrees each day with valley highs in the 60s to low
70s. Nighttime lows in the upper 20s/lower 30s in the mountains to
upper 30s/lower 40s in the valleys. A couple areas of patchy fog
have developed this morning in the Lower Columbia Basin and up
near Cle Elum and expect a increase in the coming nights as
moisture and pollutants increase under the subsidence inversion.
Fog possible near or around large bodies of water like lakes and
rivers or in small mountain valleys. Winds will be very light
through the short term period.

LONG TERM...Saturday Night through Wednesday...High pressure will
remain over the Pacific Northwest Saturday night through Monday.
This will continue the current dry pattern though clear skies will
become mostly clear by Monday. Temperatures will be a few degrees
above normal with highs in the 60s areawide. Winds will continue to
be light. By Monday night, models have an upper low and trough
approaching the coast and pushing the ridge off to the east. There
are some timing differences but at this point Monday night should be
dry with increasing clouds. On Tuesday rain will cross the Cascades
in the morning and spread across the area Tuesday afternoon and
night. Another front enters the area Wednesday according to the GFS
or Wednesday night according to the ECMWF. Leaned towards the GFS
and have a chance of rain on Wednesday. Temperatures will drop to
the upper 50s to mid 60s Tuesday and then on Wednesday to the 50s
and lower 60s with some mid 60s in the Columbia Basin. Perry

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  39  68  39  69 /   0   0   0   0
ALW  36  65  40  68 /   0   0   0   0
PSC  35  68  39  69 /   0   0   0   0
YKM  34  69  37  70 /   0   0   0   0
HRI  36  68  39  69 /   0   0   0   0
ELN  33  72  36  71 /   0   0   0   0
RDM  28  69  31  72 /   0   0   0   0
LGD  37  67  37  69 /   0   0   0   0
GCD  41  69  40  71 /   0   0   0   0
DLS  38  72  41  73 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
&&

$$

97/97



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