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fxus66 kpdt 221135 aaa 
afdpdt

Area forecast discussion...update
National Weather Service Pendleton or
434 am PDT Thu Jun 22 2017

Updated aviation discussion

Short term...today through Saturday...an upper level ridge will
build over the eastern Pacific Ocean today through Saturday. The
building ridge will keep a dry northwest flow aloft over Washington and or.
Subsidence associated with the ridge will push any disturbances to
the north. It will also keep skies mainly clear...create a warming
trend...and keep winds light. Clear skies, dry airmass, and lighter
winds will lead to wide diurnal swings with below normal overnight
temperatures and 30-40 degree warming during the daytime heating
with 15 plus hours of sunshine. Thermal banding will raise
temperatures on the ridges for Friday night and Saturday due to
warmer air aloft. Coonfield

Long term...Saturday night through Wednesday...the upper level
ridge looks to be over the Pacific northwest Saturday night through
Monday. This ridge should slowly drift east during this period.
Conditions look to be fair and dry Saturday night and Sunday with
temps continuing to increase, both the overnight low and the daytime
high. A weak upper low looks to develop west of northern California
during this period as well. As such should see increasing moisture
advection that could lead to a few showers or thunderstorms Sunday
night into Monday morning. These showers and storms would mainly be
over central and north-central Oregon. The upper low then looks to
weaken and kick east across the area Monday afternoon and night in
response to a stronger low moving into western Canada. Thus a few
showers and thunderstorms would continue to be possible over
portions of the area, mainly central and northeast Oregon. Monday
should continue to be very warm, especially over the eastern three-
quarters of the area. Drier, cooler and breezy conditions look to
return for Tuesday and Wednesday due to a westerly onshore flow. 90

&&

Aviation...12z tafs...an upper level ridge off the West Coast
will keep the region under a dry northwesterly flow. Thus VFR
conditions (mostly clear) are expected through the next 24 hours.
Winds will mainly be less than 10 kts through the period. The
exception will be krdm and kbdn where winds of 10 to 15 kts with
higher gusts are expected late this afternoon and early this
evening. 90

&&

Preliminary point temps/pops...
PDT 79 47 84 53 / 0 0 0 0
alw 81 53 87 58 / 0 0 0 0
psc 83 50 88 55 / 0 0 0 0
ykm 84 50 88 55 / 0 0 0 0
hri 83 49 88 53 / 0 0 0 0
eln 80 48 85 51 / 0 0 0 0
rdm 81 41 87 45 / 0 0 0 0
lgd 75 41 81 48 / 0 0 0 0
gcd 79 42 85 47 / 0 0 0 0
dls 85 51 92 57 / 0 0 0 0

&&

PDT watches/warnings/advisories...
or...none.
Washington...none.
&&

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