000
FXUS66 KPDT 261525
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
825 AM PDT Fri May 26 2017

.UPDATE...An upper level low over southern ID is moving away from
the area but wraparound moisture may trigger a few afternoon
showers or thunderstorms along the extreme eastern edge of the
CWA. Elsewhere a ridge building offshore will keep WA and OR
mostly clear with light N/NE winds.  Coonfield

&&

.PREV DISCUSSION... /issued 300 AM PDT Fri May 26 2017/

SHORT TERM...Today through Monday morning...An upper level trough
over eastern Oregon will move slowly away from the area today. There
will be a little wrap-around moisture over the far east today.
Models are showing some meager instability which may allow for
isolated to widely scattered showers and a slight chance of a
thunderstorm until about 00Z...mainly close to the Idaho border.
Afterwards expect dry weather to persist through Monday morning as
an upper level ridge builds over the region. Models do show some
instability over the mountainous areas on Sunday afternoon but
think with the ridge in place it will be difficult to get more
than some cumulus buildups. Temperatures will be on the increase
through the period. It will be in the 70s/60s mountains today with
80s/70s mountains Saturday and Sunday. Could see a few lower 90s
Columbia Basin Sunday afternoon. Winds will be light and mostly
terrain driven through the forecast period. 78

LONG TERM...Monday afternoon through Thursday...Models are
consistent in showing a negatively tilted mid/upper level trough
approaching the coast late Monday thus helping to break down the
strong ridge of high pressure.  Scattered showers and a few
thunderstorms may occur along the east slopes of the Cascades Monday
afternoon/evening.  The trough then moves into the region on Tuesday
through Thursday and introduces marginal instability for scattered
showers and a slight chance of afternoon/evening thunderstorms each
day.  Any thunderstorms that do develop will mainly be over the
higher terrain and mountains.  Polan

AVIATION...12Z TAFs...VFR conditions will prevail tonight through
Friday evening and in the overnight period from midnight to
daybreak on Saturday. There may be a few showers in the eastern
mountains in the afternoon, but they are expected to taper off and
and end by 01Z/27th. Otherwise, the weather will be fair at all TAF
sites with light winds.  Polan

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  74  48  81  53 /  10   0   0   0
ALW  75  53  83  58 /  10   0   0   0
PSC  80  51  87  54 /   0   0   0   0
YKM  80  51  85  55 /   0   0   0   0
HRI  79  48  86  54 /   0   0   0   0
ELN  76  48  80  52 /   0   0   0   0
RDM  72  40  82  45 /   0   0   0   0
LGD  68  43  77  47 /  10   0   0   0
GCD  68  39  80  48 /  10   0   0   0
DLS  81  54  88  57 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
&&

$$

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