Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 102246
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
246 PM PST Sun Dec 10 2017

.SHORT TERM...Tonight through Thursday...Overall a large scale upper
level ridge of high pressure will remain positioned over the Pacific
northwest through Thursday. As such, the low clouds, fog and cold
air will remain trapped beneath the low level inversion. Above the
inversion skies will remain mostly clear with milder temepratures
especially afternoon high temperatures which will be in the 40s and
50s. Some freezing fog advisories will continue through noon Monday.

.LONG TERM...Thursday night through Sunday...The strong mid/upper
level ridge will remain over the interior Pacific Northwest through
Thursday night and thus the current conditions are likely to
continue through Thursday night. The scouring out process of the low
clouds and freezing fog at lower elevations under the inversion will
be delayed until around daybreak on Friday. Morning low temperatures
Friday morning will be in the upper 20s to around 31 degrees in the
Lower Columbia Basin, adjacent valleys and Foothills of the Blue
Mountains. As such there will be a slight chance of freezing rain at
the aforementioned locations along with rain likely in the Blue
Mountain Foothills and snow in the eastern mountains. There will be
a bit of a break in precipitation Friday night as the system exits
the region. Over the weekend a warm front remains over the forecast
area for a chance of Basin/valley rain and snow in the mountains.
Polan


&&

.AVIATION...00Z TAFs...Current pressure pattern, both at the surface
and aloft, will remain over the next 24 hours. As such some of the
TAFs have a persistent forecast through the period. Low stratus and
FZFG will return to KRDM and KBDN this evening and give LIFR/IFR
conditions as well as at KPDT after 04Z. MVFR conditions due to low
cigs will continue without change at KDLS, KYKM, KPSC and KALW.
Winds will remain below 10 kts for the next 24 hours.  Polan


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  27  30  27  30 /   0   0   0   0
ALW  30  35  30  35 /   0   0   0   0
PSC  31  34  31  34 /   0   0   0   0
YKM  31  34  31  34 /   0   0   0   0
HRI  30  32  30  32 /   0   0   0   0
ELN  27  31  27  31 /   0   0   0   0
RDM  16  31  16  31 /   0   0   0   0
LGD  24  34  24  34 /   0   0   0   0
GCD  23  48  23  48 /   0   0   0   0
DLS  33  36  33  36 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Air Stagnation Advisory until 10 AM PST Thursday for ORZ041-044-
     505-507-508-510.

     Freezing Fog Advisory until noon PST Monday for ORZ508-510-511.

     Air Stagnation Advisory until noon PST Tuesday for ORZ509-511.

WA...Air Stagnation Advisory until 10 AM PST Thursday for WAZ024-
     026>029-520-521.

&&

$$

91/99/99



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