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Area Forecast Discussion (AFD)

Issued by Pendleton, OR (PDT)

FXUS66 KPDT 212137

Area Forecast Discussion
National Weather Service Pendleton OR
237 PM PDT Sun Jul 21 2019

.SHORT TERM...Tonight through Wednesday. High pressure was
dominating the regions weather with dry conditions. However some 
moisture may work its way north and into portions of the region 
tonight that could produce some showers or a tsra mainly over 
central Oregon and toward Grant county. This moisture is forecast 
to expand north into the blue and wallowa mountains toward Monday
morning and persist into Monday night. In addition some 
instability develops along the east slopes of the WA cascades late
Monday afternoon and evening and isold tsra is possible here. 

Otherwise the moisture lingers over the eastern portions of the 
cwa that includes the blue/wallowa mountains Monday night and 
Tuesday. The combination of the moisture and daytime heating will 
also increase the chances of convection across the remainder of
the area Tuesday aftn before some cooler and more stable air 
filters through the gorge and into the remainder of the area 
Tuesday night. The breezy winds along with the convection could 
create some fire weather concerns. Drier conditions along with 
cooler temperatures are expected for Thursday. 

.LONG TERM...Thursday through Sunday...Dry conditions under mostly 
westerly flow are expected through a bulk of the extended period. 
Cross-Cascade thermal gradients don't look overly impressively, but 
will still see at least a breezy diurnal response through the gaps 
each day. An uptick in winds speeds will be possible for the weekend 
with some guidance hinting at another shortwave rotating around the 
Gulf of Alaska low arriving during in timeframe. This will also 
shift westerly flow aloft a little more southwesterly allowing an 
elevated mixed layer to advect north out of the Great Basin. Given 
minimal moisture support have continued with a dry forecast 
Saturday/Sunday with some 10-14 PoPs , but would certainly not be 
out of the question for some isolated convection, especially near 
the eastern mountains Saturday if the best forcing arrives in the 
afternoon. Temperatures will be near to slightly above normal 
Thursday, around 5 degrees above normal Friday, and back to near 
normals Saturday and Sunday with a tinge of marine influence. Peck


.AVIATION...vfr conditions will persist at all taf sites for the 
next 24 hours. Meanwhile some mid level clouds may move into taf 
sites krdm and kbdn after 06z and then after 10z for the remaining 
taf sites. 


PDT  61  92  62  94 /  10  10  10  20 
ALW  64  97  67  98 /  10  10  10  20 
PSC  65  98  67  99 /   0  10   0  10 
YKM  60  96  62  96 /   0  10   0  10 
HRI  63  97  65  98 /   0  10   0  10 
ELN  58  93  63  92 /   0  10  10  10 
RDM  54  91  55  90 /  10  10   0  20 
LGD  61  91  62  93 /  10  20  20  20 
GCD  59  97  59  97 /  20  20  20  20 
DLS  65  93  65  90 /   0  10  10  20