Wildfire in Washington, October 17, 2017

Area Forecast Discussion...Corrected
National Weather Service Pendleton OR
245 PM PDT Mon Oct 16 2017

Corrected Short and Long Term Discussions

.SHORT TERM...Tonight through Wednesday night...The flat upper level
ridge over the Pacific Northwest will flatten further tonight as a
disturbance moves towards the region for the Gulf of Alaska. This
disturbance will swing across British Columbia and Washington
Tuesday. As such, will see mainly fair and dry conditions over much
of the area tonight. Will see clouds increase overnight over south-
central Washington. Also should see some light precip begin to move
into the Washington Cascade east slopes, mainly after midnight. The
system Tuesday will push a cold front across the area. The main
impact with this frontal passage will be increasing winds across the
area, especially the Columbia Basin. Winds in the Basin and adjacent
valleys will generally run 20 to 30 mph. Could see winds locally of
30 to 35 mph with gusts around 45 mph in the Yakima valley and the
Lower Basin in Washington, as well as the Kittitas valley. Thus will
issue wind advisories for these areas. Winds in the Columbia Basin
could cause some patchy blowing dust Tuesday afternoon and early
Tuesday evening. The bulk of the precip with this system will occur
along the Washington Cascade east slopes. The Blue Mountains could
see decent chances of precip Tuesday evening. A warm front will
bring precip to portions of the area, especially the Washington
Cascade east slopes, Wednesday. The precip will persist over the
Washington Cascade east slopes Wednesday night, but will largely end
elsewhere. Low temps will generally be below seasonal again tonight.
Otherwise temps will be above seasonal Tuesday through Wednesday
night. Snow levels will run 5500 feet or higher through the period.
90

.LONG TERM...Thursday through Monday...Longwave upper trough
approaches the coast Thursday and pushes a cold front into CWA
Thursday afternoon bringing rain through Thursday night. Friday will
be windy and rainy while the cold front sweeps through the region
and moves into Idaho by daybreak Friday morning. The upper trough
moves across the forecast area during the day on Friday resulting in
unsettled conditions over the eastern Oregon mountains during the
day on Friday. Friday night the region will be between weather
systems with rain shadowing at lower elevations due to a ridge  of
high pressure building over the pacific Northwest ahead of a wet
warm front that moves into central and north central Oregon Saturday
morning. The warm front and attendant rain spreads over the rest of
the forecast area Saturday afternoon. Rain totals on Saturday will
be around 0.25-0.35 inches at lower elevations and near 0.50 inch of
rain in the mountains. Snow levels lower to 4500 feet in the Blue
Mountains on Friday. The warm front at associated rain/mountain snow
remains over the forecast area Saturday night and Sunday for
additional precipitation.  Polan

&&

.AVIATION...18Z TAFs...Clear skies today through tonight with some
cirrus at times after daybreak Tuesday. Winds 5-10kt.  Polan

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  41  68  44  68 /   0  10  20  20
ALW  46  69  50  68 /   0  20  30  30
PSC  36  70  41  67 /   0  10  10  20
YKM  34  69  38  63 /   0  20  10  20
HRI  36  71  42  69 /   0  10  10  20
ELN  35  65  37  59 /   0  20  10  30
RDM  34  72  38  72 /   0   0  10  10
LGD  35  70  44  69 /   0  10  20  20
GCD  36  70  40  70 /   0   0  10  10
DLS  41  67  46  68 /   0  20  20  20

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...Wind Advisory from noon to 8 PM PDT Tuesday for WAZ027-028.

     Wind Advisory from 2 PM to 8 PM PDT Tuesday for WAZ026.

&&

90/99/99