Wildfire in Washington, September 1 to 6, 2018

Area Forecast Discussion
National Weather Service Pendleton OR
238 PM PDT Sat Sep 1 2018

.SHORT TERM...Tonight through Tuesday...This afternoon satellite
imagery shows a trough centered over the Rockies and a ridge out in
the eastern Pacific which is sending a dry northwesterly flow over
the Pacific Northwest. This will continue the clear skies with no
chance of precipitation over the area tonight. Winds this afternoon
are 10 mph or less except for 15 to 20 mph in the Columbia Gorge and
Kittitas Valley. Light winds are expected area wide overnight and
this will promote radiative cooling overnight. Most of the area will
be a couple of degrees cooler than this morning and the colder
mountain valley locations will again drop to the lower to mid 30s.
On Sunday, an upper low will move into northern British Columbia and
flatten the flow to a more westerly direction. It will also send a
weak front through the area Sunday night and Monday. The front is
moisture starved and will only bring a slight increase in
cloudiness. Have removed showers from the mountains on Monday due to
models not showing any precipitation. Winds will continue at 10 to
20 mph in the Columbia Gorge and Kittitas Valley Sunday and Monday
afternoons but remain light elsewhere. Monday night and Tuesday the
front will depart and the offshore ridging will bring a northwest
flow over the area. Skies will be mostly clear and no precipitation
is expected. Light northerly winds will be over the area Tuesday.
Temperatures will be fairly steady in the upper 70s to mid 80s in
the lower elevations and mainly in the upper 60s and 70s in the
mountains. Lows will generally be in the upper 40s to mid 50s in the
lower elevations with mid 30s to mid 40s in the mountains. Perry

.LONG TERM...Tuesday night through Saturday...A weak ridge of high
pressure will influence the regions weather with mostly dry
conditions and above normal temperatures Wednesday and Thursday.
Although the models attempt to bring a disturbance across the area
during this period only mid and high level clouds are likely.
Meanwhile a low pressure system will approach the two state area on
Friday that could produce some showers along the wa/or cascades. In
addition pressure gradients tighten and breezy conditions are
possible. Another weak ridge will push through the area Saturday and
some showers are possible along the wa/or cascades and aftn temps
will be cooler into the beginning of the weekend.

&&

.AVIATION...00Z TAFs...vfr conditions will continue across all taf
sites for the next 24 hours.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  51  80  54  79 /   0   0   0   0
ALW  54  81  55  80 /   0   0   0   0
PSC  51  84  55  82 /   0   0   0   0
YKM  50  83  55  79 /   0   0   0   0
HRI  51  83  56  82 /   0   0   0   0
ELN  49  81  54  76 /   0   0   0   0
RDM  40  82  45  80 /   0   0   0   0
LGD  43  79  46  78 /   0   0   0   0
GCD  47  80  51  80 /   0   0   0   0
DLS  54  84  59  80 /   0   0   0   0

&&

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

83/97/97