Weather Service Report


862 
FXUS66 KPDT 050031 AAA
AFDPDT

Area Forecast Discussion...Updated
National Weather Service Pendleton OR
400 PM PST Sun Dec 4 2016

Updated AVIATION Discussion

.SHORT TERM...Today through Tuesday night. A low pressure system and
its associated cold front raced across the two state area and was
continuing to bring clouds and showers to the area that have now
been mostly confined to the area mountains. An upslope flow will
persist into this evening along the blue/wallows mountain areas
with some additional accumulation expected. Elsewhere the showers
were decreasing while drier conditions were moving into the area.
Also pressure gradients had tightened along the foothills of the
blue mountains and a wind advisory has been issued to go along with
the advisory in the Kittitas valley.

Colder air will continue to advent into the region overnight and
another storm system will take aim on the pacnw tomorrow. This
storm will track from west to east with light snow possible
over Central Oregon in the morning and then over the Pendleton/Walla
Walla/Meacham areas Monday afternoon. Elsewhere showers will persist
into Tuesday before a weak ridge of high pressure tries to build into
our area Tuesday night. Temperatures will be noticeably colder as
overnight lows dip below freezing across most locations into
midweek.

.LONG TERM...Wednesday through Sunday...Upper level ridge of high
pressure through Wednesday afternoon for dry conditions across the
Pacific Northwest. A slow moving warm front enters the forecast area
Wednesday night and spreads snow into the forecast area. The frontal
band will remain over the region on Thursday through Friday for an
extended period of snow. Snow levels will remain at the floor of the
Columbia Basin or extremely low over the Lower Columbia Basin so
snow accumulations are expected at all elevations through Friday
afternoon. Friday night a fast moving upper level shortwave moves
into the Pacific Northwest for another round of precipitation that
continues into the weekend for snow showers in the mountains and the
potential for a combinations of rain and snow showers at the lowest
elevations in the Columbia Basin during daylight hours through
Sunday.  Polan

&&

AVIATION...00Z TAFS...VFR conditions next 24 hours. A cold front has
exited central Oregon and is in the processs of clearing through the
NE Oregon mountains. Orographic lift over the Blues will keep MVFR
conditions along the aviation route between KPDT and KBKE for a few
more hours. KRDM and KBDN will have CIGs of BKN 030-040 through
tonight. KALW and KPDT will have SCT-BKN 060-090 tonight. KYKM, KDLS
and KPSC will have FEW-SCT 150-200 through most of tonight
followed by lower and thickening clouds late tonight associated with
the nest system, which moves into central Washington and north
central Oregon Monday morning. This system is expected to bring
-SN to KYKM and KDLS starting around 18Z-20Z on Monday. Precip will
spread to other TAF sites late in the day on Monday, most likely
after 06th/00Z. Winds will gradually decrease this evening after
05/03Z. Winds after 05th/15Z will be 10-15 kts.  Polan 

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  27  35  23  29 /  20  60  30  30 
ALW  31  36  28  31 /  30  60  30  30 
PSC  28  37  26  33 /  10  60  30  20 
YKM  21  36  22  33 /  10  50  30  10 
HRI  27  37  25  33 /  10  50  30  20 
ELN  23  33  21  30 /   0  60  30  10 
RDM  20  36  18  29 /  20  60  30  40 
LGD  23  32  23  27 /  30  50  50  30 
GCD  22  34  23  28 /  40  60  40  40 
DLS  33  39  29  36 /  10  50  30  20 

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Wind Advisory until 10 PM PST this evening for ORZ507.

     Winter Storm Warning until 10 PM PST this evening for ORZ502.

     Winter Weather Advisory until 10 PM PST this evening for ORZ050.

     Winter Weather Advisory until 3 PM PST this afternoon for ORZ509.

WA...Wind Advisory until 10 PM PST this evening for WAZ029.

     Winter Storm Warning until 10 PM PST this evening for WAZ030.

     Wind Advisory until 6 PM PST this evening for WAZ026.

&&

$$

97/99/99

Return to Home page


Western Regional Climate Center, wrcc@dri.edu