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Area Forecast Discussion (AFD)

Issued by Pendleton, OR (PDT)

FXUS66 KPDT 230842

Area Forecast Discussion
National Weather Service Pendleton OR
142 AM PDT Fri Aug 23 2019

.SHORT TERM...Today through Sunday night...A dry and stable 
northwest flow will persist over the forecast area through the short 
term period. This will be the result of a broad upper trough over 
the northern plains and a broad upper ridge over the north central 
Pacific. Weather conditions through today and tonight will be calm 
with mostly light winds and mostly clear to partly cloudy skies. 
Clouds will be mainly just mid and high clouds. Then by Saturday 
afternoon an upper jet stream wind maximum will sag southward over 
the forecast area and cause winds at all levels to increase. It will 
become breezy to windy over most of the forecast area at the 
surface...especially over the open terrain of the Lower Columbia 
Basin and adjacent valleys. At this time wind speeds are not 
expected to reach advisory criteria, but they will need to be 
monitored in case forecast winds trend upward in speed...especially 
in the eastern Columbia River Gorge and north central Oregon. The 
upper jet will then lift to the north and northeast Saturday night 
and Sunday which will allow winds to diminish and become light again 
by Sunday, through there may still be locally breezy conditions 
Sunday afternoon and evening. Precipitation is not expected through 
the period. Temperatures will be around normal today and Saturday 
with readings in the mid to upper 80s lower elevations and mainly 
70s mountains. Then they will cool off on Sunday to below normal 
with readings in the lower to mid 80s lower elevations, and upper 
60s to mid 70s mountains. 88

.LONG TERM...Monday through Friday...Long term period begins with 
strong ridging off the West Coast and troughing over the eastern 2/3 
of the US with the PacNW in between under a dry northwesterly 
pattern aloft. Ridging will slowly build east over the region next 
week and will bring very warm temps running 5-10+ degrees above 
normal. Expect afternoon highs in the 80s to mid 90s and nighttime 
lows in the upper 40s to low 60s. By late week a weak wave trying to 
undercut the ridge overhead, along with possible remnants of 
Tropical Storm Ivo, could bring a slight chance of showers and 
storms Thursday/Friday, mainly over the mountains in Oregon. 
Northerly winds 5-15 mph through the period with thermal low 
building south of the CWA.


.AVIATION...12Z TAFs...VFR conditions through the period with 
passing cirrus. Wind 5-10kts, slightly stronger at DLS with gusts up 
to around 20kts possible Friday afternoon/evening.


PDT  84  57  83  51 /   0   0   0   0 
ALW  88  62  87  56 /   0   0   0   0 
PSC  87  63  87  57 /   0   0   0   0 
YKM  87  57  85  53 /   0   0   0   0 
HRI  88  60  87  54 /   0   0   0   0 
ELN  84  57  79  54 /   0   0   0   0 
RDM  86  50  85  47 /   0   0   0   0 
LGD  84  56  83  50 /   0   0   0   0 
GCD  89  55  89  50 /   0   0   0   0 
DLS  89  61  83  58 /   0   0   0   0