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Area forecast discussion 
National Weather Service Pendleton or
145 PM PDT Friday Jul 25 2014

Short term...tonight through Monday...Flat westerly flow over the
region will begin to lift northward as The Four Corners high begins
to amplify over the western states during this period. As a result
temperatures will gradually climb each day and could be around 100
degrees across the lower Columbia Basin by Monday. The amplifying
high will lead to an increased southwest flow across the forecast
area with some monsoonal moisture reaching the forecast area by
Sunday and Monday. This will lead to a slight chance of
thunderstorms late Sunday and then again on Monday...mainly across
central to northeast Oregon.

Long term...Monday night through Friday...an upper level ridge will
persist over the western third of the country next week. Subsidence
from the ridge will bring hot and dry conditions to the region.
Highs will be in the 90s for many locations with the Columbia Basin
around 100. Monsoon moisture may move around the backside of the
ridge at times...and afternoon and evening thunderstorms may develop
as unstable flow combines with daytime heating. Thunderstorms will
be most likely over central Oregon and the northeast mountains.
However...thunderstorms chances will increase each day and spread
northward with the best chances for widespread activity being
Friday. Yet for now have kept chances less than 25 percent each day
due to uncertainty in the strength of each wave and limited low
level moisture. Cobb



&&

Aviation...00z tafs...dry west flow aloft will keep conditions VFR
with mostly clear skies through the next 24 hours. Winds will mainly
be 10 kts or less and terrain driven. 82



&&

Fire weather...temperatures will warm and relative humidity will
decrease as a ridge of high pressure builds over the region this
weekend. Overnight humidity recover will become moderate to
poor...especially over the ridgetops by Monday. The next concern
will be the monsoon moisture moving northward into portions of
central Oregon as early as Sunday afternoon. In addition to a small
disturbance...this could lead to the development of a few
thunderstorms Sunday afternoon and evening in zones 611...610 and
into 640. This moisture will spread further north and east with more
areas seeing the potential for afternoon and evening thunderstorms
through the week. Dmh



&&

Preliminary point temps/pops...
PDT 52 89 59 94 / 0 0 0 0
alw 59 90 64 95 / 0 0 0 0
psc 58 92 61 97 / 0 0 0 0
ykm 52 88 58 93 / 0 0 0 0
hri 55 92 59 97 / 0 0 0 0
eln 51 86 54 90 / 0 0 0 0
rdm 43 87 50 90 / 0 0 0 10
lgd 48 86 54 91 / 0 0 0 10
gcd 51 89 57 93 / 0 0 0 10
dls 57 90 61 93 / 0 0 0 0

&&

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

For additional weather information, check our web site at...
www.Weather.Gov/Pendleton

$$

91/82/82

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