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Area forecast discussion 
National Weather Service Pendleton or
258 am PDT Wednesday Jul 27 2016

Short through Friday...a westerly flow under a Flat
Ridge to our south will keep hot and generally dry weather over our
area through Friday. Today is somewhat tricky as a wave will move
through the area this afternoon. Satellite imagery shows the wave as
an area of clouds headed for the Washington/Oregon coast. Models are
not showing any precipitation and any convection appears to be
fighting capping along the Washington Cascades. Still, there have
been a thunderstorm or two there each of the last two afternoons.
Have raised pops to about 10 percent but have kept mention of
showers or thunderstorms out of the forecast. The models do show
some moisture and showers along the higher terrain of eastern Oregon
from Grant County to Wallowa County. I am not seeing where the
moisture is coming from (it's not there this morning and disappears
in the evening) so do not have much confidence in this feature but
have raised pops to about 10 percent there as well. The wave will
keep pressure gradients tight along the Cascades and winds will
continue at 10 to 20 mph in the Kittitas Valley and the Columbia
Gorge through tonight. Winds will be lighter elsewhere and generally
below 10 mph. Today will be hot again with temperatures about 2-4
degrees warmer than yesterday with mid 90s to lower 100s in the
lower elevations and mid 80s to lower 90s in the mountains. Tonight
through Friday will see a gradual strengthening of the ridge over
the western Continental U.S. And the flow will turn more northwesterly and even
drier. Do not foresee any chance of showers or thunderstorms.
Temperatures Thursday and Friday will be a degree or two warmer than
today with highs in the upper 90s to lower 100s and mainly 90s in
the mountains. Winds will be fairly light though the Kittitas Valley
and Columbia Gorge will reach 10 to 15 mph each afternoon and early
evening. Perry

Long term...Friday night through Tuesday...a Flat Ridge pattern
over the region will begin to buckle over the weekend as an upper
level trough takes up a position over western Canada. There will be
a few impulse passing through the trough but no precipitation
expected this far south. The main impact of the trough will lower
temepratures back to near normal and periods of breezy winds through
the long term.


Aviation...12z tafs...VFR conditions will persist for the next 24
hours across all taf sites.


Preliminary point temps/pops...
PDT 96 62 99 65 / 0 0 0 0
alw 97 69 99 71 / 0 0 0 0
psc 100 65 102 67 / 0 0 0 0
ykm 100 69 102 69 / 0 0 0 0
hri 99 64 101 66 / 0 0 0 0
eln 97 63 98 63 / 0 0 0 0
rdm 94 52 98 56 / 0 0 0 0
lgd 94 57 95 57 / 0 0 0 0
gcd 95 57 98 59 / 10 10 0 0
dls 95 65 100 67 / 0 0 0 0


PDT watches/warnings/advisories...



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