Area forecast discussion 
National Weather Service Pendleton or 
941 PM PDT Monday Sep 26 2016 


Short term...tonight and Tuesday...water vapor satellite imagery 
shows a ridge of high pressure over the region with the ridge axis 
over Idaho and Montana. Clear skies through tonight. Lows tonight 
will be in the lower 50s to lower 60, except in the mid 40s to mid 
50s in the mountains and in the lower 30s to lower 40s in the 
higher valleys in mountainous areas. Tomorrow we will be on the 
western flank of the ridge so we will begin seeing more thin high 
clouds tomorrow afternoon. Highs Tuesday will be in the lower to 
mid 80s, which is 3-5 degrees cooler than the highs today. Polan 


&& 


Aviation...06z tafs...clear skies tonight and mostly clear skies 
after daybreak on Tuesday. Mid level clouds scattered 15000-20000 ft 
above ground level Tuesday as a weak frontal boundary moves through the area. 
Winds 5-10 kt through tonight and 7-15 kts Tuesday after 17z. 
Polan 


&& 


Previous discussion... /issued 115 PM PDT Monday Sep 26 2016/ 


Short term...tonight through Thursday evening...upper level ridging 
will continue to exit to the east...with the next trough of low 
pressure slowly approaching the area by Wednesday/Thursday. A weak 
marine push will enter the region on Tuesday providing for 
breezy/windy conditions for the Columbia Gorge and the Kittitas 
Valley. Due to the limited strength of the marine push...only expect 
a slight increase in winds for the Columbia Basin and Blue Mountain 
foothills. A gradual cooldown in temperatures can be expected as 
ridging exits and troughing approaches...with highs about 3-4 cooler 
each day through Thursday. The next chance of showers will occur 
late Thursday/Thursday evening as an initial wave is progged to 
rotate around the trough to the west. Given limited deep layer 
moisture...will cap pops at slight chance for now. GFS does depict 
some limited instability for Thursday aftn/evening...but think it 
will not be sufficient enough for any thunderstorm development. 


Long term...Thursday night through Monday. An upper level trough 
will control the weather pattern across the Pacific northwest for 
the extended period. The trough will be located offshore Thu night 
and Fri into Sat with a southwest flow aloft. Weak instability 
across the region with a slight chance of showers and partly to 
mostly cloudy skies. Temperatures will be cooling down closer to 
seasonal levels. As the trough moves inland sun into Mon there will 
be increasing chances for rain. Temperatures will continue cooling 
with highs in the upper 50s and 60s. Snow levels will be about 6-7k 
feet. 94 


&& 


Preliminary point temps/pops... 
PDT 54 84 48 80 / 0 0 0 0 
alw 55 84 53 80 / 0 0 0 0 
psc 55 86 51 82 / 0 0 0 0 
ykm 50 84 47 81 / 0 0 0 0 
hri 49 85 49 81 / 0 0 0 0 
eln 48 79 45 78 / 0 0 0 0 
rdm 42 84 40 81 / 0 0 0 0 
lgd 43 83 45 82 / 0 0 0 0 
gcd 49 85 46 85 / 0 0 0 0 
dls 55 83 51 81 / 0 0 0 0 


&& 


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


$$ 


99/99/80/94 






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