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fxus66 kpdt 210959 
afdpdt

Area forecast discussion
National Weather Service Pendleton or
259 am PDT Fri Jul 21 2017

Short term...Friday through Sunday night...dry westerly flow
over the region today with sunny skies. Satellite and models
indicate a few clouds along the Washington Cascades as a front
moves into southern British Columbia. Highs today a few degrees warmer than
Thursday with mid to upper 80s. The upper ridge builds stronger
Saturday. Skies will remain mostly clear and temperatures several
degrees warmer. Highs in the lower to mid 90s. A weak upper level
trough will be approaching the northern California coast Sunday.
This system will increase the instability especially over central
Oregon by afternoon with cumulus developing. Isolated
thunderstorms could develop over the Oregon Cascades by late
afternoon. The trough slowly moves inland Sunday night and may
result in isolated showers or thunderstorms from central Oregon
across the John Day Highlands. 94

Long term...Monday through Thursday...models are in
agreement in terms of indicating a mid/upper level trough off the
northern California coast Monday which then moves northeastward
into far northern California and SW Oregon by daybreak on Tuesday.
The trough then moves slowly NE across the forecast area on Tuesday,
Tuesday night and Wednesday morning. The trough will transport mid
level moisture and elevated instability across the central and NE
Oregon zones for a slight chance of thunderstorms Monday through
Tuesday night into Wednesday. The trough exits the region by
Wednesday afternoon with a westerly flow aloft taking over in the
Pacific northwest for dry conditions Wednesday afternoon through
Thursday. Polan

&&

Aviation...VFR conditions will persist across all taf sites for
the next 24 hours. Polan

&&

Preliminary point temps/pops...
PDT 86 59 93 63 / 0 0 0 0
alw 88 62 94 68 / 0 0 0 0
psc 90 60 96 65 / 0 0 0 0
ykm 88 60 96 65 / 0 0 0 0
hri 89 59 96 64 / 0 0 0 0
eln 85 59 93 63 / 0 0 0 0
rdm 86 49 92 55 / 0 0 0 0
lgd 84 53 90 56 / 0 0 0 0
gcd 87 52 92 57 / 0 0 0 0
dls 87 63 96 67 / 0 0 0 0

&&

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

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