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Area Forecast Discussion (AFD)

Issued by Pendleton, OR (PDT)

FXUS66 KPDT 191717 AAA

Area Forecast Discussion
National Weather Service Pendleton OR
1020 AM PDT Mon Aug 19 2019

Updated Aviation Discussion 

.SHORT TERM...Today and tonight...No meaningful change expected to 
occur over the next 24 hours. A dry westerly flow will slowly turn 
southwesterly in advance of an approaching trough but with no 
moisture expected in this flow until Wednesday. Temperatures will 
continue to be seasonal and winds light through tonight. 


.PREV DISCUSSION... /issued 147 AM PDT Mon Aug 19 2019/ 

SHORT TERM...Today through Wednesday night...A westerly flow early 
this morning will become southwest by this afternoon and then will 
persist through Wednesday. An upper trough embedded in the flow will 
move across the region and forecast area late Wednesday and 
Wednesday night. This will bring limited moisture to the CWA on 
Wednesday and Wednesday night. The moisture will be limited, but 
there should be enough for some showers over mainly the Cascade east 
slopes Wednesday afternoon and night. Precipitation amounts should 
be very light due to the limited moisture. The upper trough axis 
with this system will cross the central CWA Wednesday night and then 
will move out during the beginning of the extended period. Models 
are in good agreement through most of the short term. Temperatures 
will increase with a warming trend through Tuesday, with maximum 
readings in the lower to mid 90s in the lower elevations and then 
cooling to the upper 80s to lower 90s on Wednesday as the upper 
trough approaches the forecast area. It will become breezy to windy 
over much of the forecast area with this system, especially 
Wednesday evening. Winds should stay below advisory criteria. 88

LONG TERM...Thursday through Monday...A fairly deep upper level 
trough will be exiting the region to the east Thursday morning 
followed by dry northwest flow aloft through the weekend into early 
next week. There will be little if any chance for showers under this 
flow pattern with just a few clouds from time to time mainly north. 
it will be cool Thursday behind a surface cold front with below 
normal Temperatures. the rest of the period the temperatures will be 
within a few degrees of normal for this time of year. There will be 
occasional breezy periods in the afternoon and evening especially in 
the cascade gaps with the strongest winds expected on Saturday. 78

AVIATION...18Z TAFS...VFR conditions with mostly clear skies today 
and some increase in high level cirrus late tonight. Winds mostly 12 
kt or less today but around 15 kt with gusts to 20-25 kt at KDLS. 
Winds becoming mostly light and terrain driven tonight. 93


PDT  89  60  93  60 /   0   0   0   0 
ALW  89  63  93  64 /   0   0   0   0 
PSC  92  64  94  66 /   0   0   0   0 
YKM  88  55  92  60 /   0   0   0   0 
HRI  91  63  94  62 /   0   0   0   0 
ELN  88  58  92  60 /   0   0   0   0 
RDM  91  51  93  54 /   0   0   0   0 
LGD  90  53  93  59 /   0   0   0   0 
GCD  91  57  94  57 /   0   0   0   0 
DLS  86  62  89  65 /   0   0   0   0