Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 241640
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
840 AM PST Fri Nov 24 2017

.SHORT TERM...Today through Sunday...Have decreased POPs on
Washington east slopes for rest of today as radar and satellite
show activity has pretty much diminished. Also decrease cloud
cover in most areas. Ridge building over the area for decreasing
winds and clouds for today and tonight. Models in good agreement
on bringing moisture back into area on southwest flow Saturday as
ridge axis moves east. Chance for rain continues into Sunday with
snow level rising to over 6k, so impacts from precipitation are
minimal.

&&

.PREV DISCUSSION... /issued 315 AM PST Fri Nov 24 2017/

LONG TERM...Sunday Night through Thursday. The run-to-run
continuity of the medium range models has a lot to be desired,
primarily with the timing of individual fronts across the Pacific
NW.  Confidence is high that there will be a progressive flow
pattern.  The challenge is timing which affects all of the sensible
weather elements for each period.  A cold front Sunday night will
bring numerous rain and snow showers along the Cascades, central
and northeast Oregon, and southeast Washington.  Snow accumulations
of 1-4 inches are forecast for elevations above 3500 feet.  PoPs on
Monday were adjusted for the timing of the front--indicating drying
conditions Monday afternoon when the front exits the region followed
by a weak shortwave ridge.  Medium range models are now faster with
the next front and is now progged to move onshore Monday night then
east of the Cascades on Tuesday, exiting the region Wednesday
morning. Wednesday and Thursday still appear as two days with mostly
dry and seasonable conditions with another upstream front tracking
across the Pacific NW on Friday.  No major wind concerns are
anticipated during the long term, although it will be occasionally
breezy to locally windy. At this time, no significant winter
precipitation is expected as well.  Wister

AVIATION...12Z TAFs...Generally VFR conditions with light winds are
expected through the next 24 hours as transitory ridging builds into
the region. Skies will be SCT with bases AOA 6k feet AGL with SCT-
BKN cirrus clouds. Radiational fog may develop tonight with possible
MVFR conditions. 12Z TAFs will reflect some mist and stratus near
KPSC and KDLS. Wister

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  52  34  48  40 /   0   0  30  30
ALW  54  37  50  42 /   0   0  30  30
PSC  55  34  46  38 /   0   0  40  40
YKM  52  32  44  36 /  10   0  60  50
HRI  55  33  47  39 /   0   0  40  30
ELN  48  30  42  33 /  10  10  60  60
RDM  51  30  51  39 /   0   0  40  40
LGD  49  32  47  42 /   0   0  30  30
GCD  51  33  50  43 /   0   0  30  30
DLS  54  35  47  39 /  10   0  60  60

&&

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

$$

79/85/99



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