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FXUS66 KPDT 180916

Area Forecast Discussion
National Weather Service Pendleton OR
217 AM PDT Sat Aug 18 2018

.SHORT TERM...Today through Monday...A ridge of high pressure will 
be over the region through midday Sunday. Expect a nice day today 
with Sunny skies and warm temperatures. Highs will be 90-95 lower 
elevations and 80-85 mountains. It will be clear and cool tonight 
with lows 55-60 in the lower elevations and 45-50 mountains. It will 
be mostly sunny and hot on Sunday with temperatures a couple of 
degrees warmer than today. A trough of low pressure will be 
approaching the area toward evening. After 5-7 pm there will be a 
slight chance of thunderstorms from the central into the northeast 
mountains. Storms are not expected to be strong or severe. A few 
showers will linger overnight Sunday into Monday morning with a 
slight chance for thunderstorms east Monday afternoon. Highs on 
Monday will be in the lower to mid 90s in the lower elevations and 
in the lower to mid 80s mountains. There should be a bit less smoke 
and haze around the next couple of days but it could increase from 
the Canadian fires on Monday as the flow turns northeasterly. 78

.LONG TERM...Monday night through Saturday...Models continue to 
suggest a rather low amplitude and active pattern through the middle 
of next week over the Pacific Northwest with systems undercutting 
the broader ridging extending up into Alaska. Multiple models show 
decent mid-level moistening in northeasterly flow across a bulk of 
the area Monday evening as a weak disturbance back builds into the 
area from the east but think this may be a little overdone and have 
confined a slight chance of thunderstorms primarily in the eastern 
mountains for now. Operational models are much more modest in any 
mid-level moisture for Tuesday afternoon, but ensembles continue to 
hint at just enough to justify an additional round of afternoon 
slight chance thunderstorm PoPs across similar areas - even less 
confidence in this. With north/northeasterly flow with both of these 
weak systems will likely see haze/smoke from Canadian fires 
returning to the area early next week. The overarching ridge begins 
to break down toward the end of the week with dry and (hopefully) 
smoke free westerly flow bringing a slight cooling trend. Peck


.AVIATION...12Z TAFs...Mostly clear skies with winds generally less 
than 10 KTs. Will see one more day of nearly unrestricted visibility 
in hazy skies before conditions begin to worsen again into early 
next week.


PDT  90  62  94  62 /   0   0   0  10 
ALW  92  61  95  62 /   0   0   0   0 
PSC  93  59  95  61 /   0   0   0   0 
YKM  92  60  93  61 /   0   0   0   0 
HRI  93  59  95  61 /   0   0   0   0 
ELN  92  58  93  59 /   0   0   0   0 
RDM  91  50  91  53 /   0   0   0  20 
LGD  89  52  92  57 /   0   0   0  20 
GCD  90  57  93  58 /   0   0   0  20 
DLS  93  63  95  65 /   0   0   0  10 



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