705 
FXUS66 KPDT 092215
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
215 PM PST Sat Feb 9 2019

.SHORT TERM...Upper-level low dropping south along the OR coast 
today will weaken tonight as energy transfers to secondary low 
developing over central OR and lifting NE into the Blues tomorrow.
Light snow currently falling over parts of far eastern WA/OR but 
moderate to heavy snow is over central OR/WA as occluded frontal 
zone continues to work east across the region through tonight. 
Could be some convective elements to the snow leading to white out
conditions at times. As the low shifts northeast tomorrow, snow 
will dissipate west to east but wrap-around snow in deformation 
band lingering across northeast OR/southeast WA into the afternoon
before ending tomorrow evening. Strong winds around the north 
side of the low is creating areas of blowing and drifting snow in 
the Lower Columbia Basin, Kittitas/Yakima Valleys and north- 
central OR. Gusts 30-50 mph expected through the evening will lead
to very hazardous to near impossible travel with greatly reduced 
visibility. A Blizzard Warning remains effect for Yakima and 
Kittitas valleys with strongest winds over the summits. Near
blizzard conditions possible as well over the Simcoe Highlands 
and Benton County.

Another system will be on the heels of this one Sunday night and 
Monday. This will be a quick hitter with mostly advisory level 
snow but a few warnings may be needed. Believe there is just 
enough gap in time to treat the two systems separately.

Very cold temps continue with highs in the upper teens to lower
30s and lows in the single digits to teens.

.LONG TERM...Monday night through Saturday. A series of weather 
systems will continue to move through during the extended period 
with temperatures remain cold with periods of snow.  On Monday night 
and Tuesday...models are similar with a low pressure system moving 
south over Washington with a band of moisture  in spreading a band 
of moisture from southwest Oregon through central Washington through 
Tuesday. Wind fields also show upslope flow into central Washington 
through the period and may need highlights, but will wait until 
current warnings and advisories end to avoid confusion.  The system 
moves through on Tuesday and Wednesday with deceasing moisture over 
the area and a weak ridge to move through Thursday. The next system 
will be moving into the area Thursday night and should keep a chance 
of snow over most of the area through Saturday. 93

&&

.AVIATION...00Z Tafs. IFR/MVFR cigs and vsby in snow will continue 
across southern Washington and northern Oregon overnight.  North to 
northwest wind 15-25kt with gusts to 30kt at locations in Washington 
and northern Oregon will continue till around 6z and cause blowing 
snow.  Snow will be decreasing from north to south across the area 
during the early morning hours and should become showery with 
improving conditions at most locations after 15z. 93 


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  12  19  13  22 /  90  50  70  60 
ALW  14  22  13  23 /  80  60  60  50 
PSC  15  21  10  19 /  80  50  70  50 
YKM  13  20   6  18 /  70  20  70  60 
HRI  15  22  13  21 /  90  40  70  60 
ELN   7  21   4  18 /  50  10  70  50 
RDM   8  28  19  35 /  60  10  70  50 
LGD  14  24  16  29 /  90  60  80  70 
GCD  16  27  19  35 /  90  40  80  80 
DLS  17  26  20  28 /  70  20  80  70 

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Winter Weather Advisory until 7 AM PST Sunday for ORZ509-511.

     Winter Storm Warning until 10 AM PST Sunday for ORZ041-505-506-
     508-510.

     Winter Weather Advisory until 1 PM PST Sunday for ORZ503.

     Winter Weather Advisory until 4 PM PST Sunday for ORZ049-050-502.

     Winter Storm Warning until 1 PM PST Sunday for ORZ044-507.

WA...Winter Storm Warning until 10 AM PST Sunday for WAZ024-520-521.

     Winter Weather Advisory until 1 PM PST Sunday for WAZ029.

     Winter Weather Advisory until 4 PM PST Sunday for WAZ030.

     Winter Storm Warning until 1 PM PST Sunday for WAZ028.

     Blizzard Warning until 10 AM PST Sunday for WAZ026-027.

&&

$$

84/93/93