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Area forecast discussion 
National Weather Service Pendleton or
300 am PDT Thursday Jul 30 2015

Short through Friday night...the Pacific northwest
will be under an upper level high pressure ridge through this
period. The air mass over much of the region during this period will
be quite dry. Thus expect a sunny day today and a clear night
tonight. Clouds with bases at or above 15000 feet mean sea level will move into
central Oregon Friday. These clouds will spread a bit further north
Friday night. With the arrival of this high level moisture Friday,
there will be an outside chance of a late afternoon thunderstorm
over the higher terrain of southwest Deschutes County. High temperatures
will warm into the middle 90s to 105 at the lower elevations today,
then rise another degree or two Friday. Low elevation overnight lows
will mostly be in the 50s tonight, but should rise to the upper 50s
to middle 60s Friday night/Saturday morning. At this time will hold off
on any heat advisories due to the cool overnight lows, but
advisories may be needed for portions of the Columbia Basin Friday
afternoon into Sunday. 90

Long term...Saturday through Thursday...Saturday through Sunday
night a strong ridge of high pressure will be over the western
states. This will give US hot weather with temperatures in the middle
90s to middle 100s with middle 80s to middle 90s in the mountains. The GFS
continues to show a modest amount of moisture coming into the area
from the south Saturday afternoon so have a small area of a slight
chance of showers and thunderstorms in the Oregon Cascades in
Deschutes and Jefferson counties. On Sunday the moisture inflow will
increase and have a slight chance of showers and thunderstorms in
central Oregon south of Madras and in the eastern mountains. By
Monday an upper low along the northern British Columbia coast has
developed an offshore trough and pushed the ridge axis to The
Rockies with our area on the western fringe of the ridge. This will
cool temperatures about 5 degrees on Monday but the southwest flow
of moisture over the area will keep a slight chance of showers and
thunderstorms over central Oregon and the eastern mountains. Tuesday
through Thursday the low will gradually move south along the coast
and our area will be under the trough. This will keep the cooling
trend going with temperatures reaching the middle to upper 80s with middle
70s to lower 80s in the mountains by Wednesday and Thursday. There
will continue to be a slight chance of afternoon and evening
showers and thunderstorms in central Oregon and the eastern
mountains Tuesday through Thursday. Perry


Aviation...12z tafs...VFR conditions with generally clear skies
will continue over all taf sites for the next 24 hours. Winds will
remain below 12 kts. Perry


Preliminary point temps/pops...
PDT 100 61 102 62 / 0 0 0 0
alw 101 66 103 69 / 0 0 0 0
psc 102 57 104 60 / 0 0 0 0
ykm 99 57 102 62 / 0 0 0 0
hri 102 57 104 64 / 0 0 0 0
eln 101 56 102 60 / 0 0 0 0
rdm 99 52 100 54 / 0 0 10 10
lgd 95 50 97 51 / 0 0 0 0
gcd 100 52 102 55 / 0 0 10 10
dls 105 61 104 63 / 0 0 0 0


PDT watches/warnings/advisories...

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