000 
fxus66 kpdt 241038 
afdpdt 


Area forecast discussion 
National Weather Service Pendleton or 
237 am PST Tue Jan 24 2017 


Short term...a large upper level trough continues over the western 
United States with most its storm energy south and east of the 
Pacific northwest. Meanwhile an upper level ridge is approaching the 
West Coast which is beginning to place the Pacific northwest under a 
northerly flow. This northerly flow will persist through Wednesday 
with a few snow showers over the far eastern mountains. A weather 
system trys to move through the ridge late Wednesday and Thursday 
but the ridge remains in place. Moisture associated with this 
weakening system could spread few more widespread showers over the 
forecast area during this time. Other concern will be the fog and 
stratus that will remain trapped in the lower elevations due to 
strengthened inversion under the ridge. Visibilities will vary as 
the fog and stratus move and there could be some icy conditions 
resulting from freezing fog and or freezing drizzle. 


Long term...Thursday night through Monday. A strong upper level 
ridge will dominate the weather pattern across the region through 
the weekend. Strengthening low level inversions will result in low 
clouds and freezing fog for the Columbia Basin and adjacent valleys. 
Temperatures will remain in the mid 20s to mid 30s with light winds. 
For the mid and higher elevations above the inversion skies will be 
clear to partly cloudy. There will be more of a diurnal temperature 
spread with highs in the 30s and lows in the teens. An upper level 
short wave and front will move across the area Sunday night and 
Monday. Not likely to see much precipitation with this system except 
for some showers over the Cascades. However appears there will be 
enough wind and cold advection aloft to mix out the low clouds and 
fog in the Columbia Basin and valleys. 94 




&& 


Aviation...12z tafs. Main impacts to aviation for the next 24 
hours will be low clouds and freezing fog. Low ceilings and 
visibility will result in MVFR/IFR conditions. Occasional LIFR as 
well. Conditions should gradually improve during the day then 
diminish again after sunset. 94 




&& 


Preliminary point temps/pops... 
PDT 32 26 33 27 / 0 10 10 20 
alw 34 29 34 28 / 10 10 10 20 
psc 35 30 34 27 / 0 10 10 10 
ykm 33 22 33 26 / 0 0 10 10 
hri 34 27 34 27 / 0 10 10 20 
eln 32 21 31 24 / 0 10 10 10 
rdm 34 19 34 19 / 0 10 10 20 
lgd 31 20 30 22 / 10 10 10 20 
gcd 30 18 30 20 / 10 10 10 20 
dls 38 30 39 30 / 0 10 10 20 


&& 


PDT watches/warnings/advisories... 
or...none. 
Washington...none. 
&& 



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