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Area Forecast Discussion (AFD)

Issued by Pendleton, OR (PDT)

FXUS66 KPDT 220510 AAA

Area Forecast Discussion...Updated Aviation
National Weather Service Pendleton OR
1010 PM PDT Wed Aug 21 2019

.UPDATE...A band of showers associated with a frontal boundary
is weakening as it crosses eastern OR/WA. Residual precip
across the Columbia Basin and Blue mountain foothills will end
in the next couple of hours, with the band weakening further as
it crosses the eastern mountains late this evening into the
overnight. With little/no instability, will remove isolated
thunderstorms from the forecast. Wind gusts in excess of 40
mph earlier are subsiding and will continue to diminish late
this evening. 

.AVIATION...06Z TAFs...VFR conditions will prevail for the next 24 
hours. Residual clouds in the wake of a decaying frontal boundary 
will diminish overnight, with SKC for all sites by 12-15Z. Winds
will generally remain under 12 KT, except for DLS where winds will
increase Thursday afternoon to 12-15 KT with gusts to 25 KT.


.PREV DISCUSSION... /issued 350 PM PDT Wed Aug 21 2019/ 

SHORT TERM...Tonight through Saturday night...a cold front is 
currently passing over the Cascades and will progress eastward 
through the forecast area this evening and exit late tonight. There 
will be a band of precipitation associated with the frontal passage 
along with a brief period of windy conditions. Any convective threat 
will be limited to near the Idaho border through this evening. 
Cooler air will filter in behind the front overnight and Thursday as 
the trough axis passes and exits. Following the trough passage the 
region will be under a dry westerly flow heading into the weekend. 
Temperatures will slowly warm Friday and Saturday to be near normal. 
There will be some locally breezy conditions along the east slopes 
of the Cascades each afternoon and evening under the westerly flow 

LONG TERM...Sunday through Wednesday...Quiet weather is expected 
as the long term period will feature a ridge centered offshore. The 
ridge will gradually strengthen and no precipitation is expected or 
even much in the way of clouds. Models hint at some moisture trying 
to get pulled into the area from the south on Wednesday but it 
appears it would just amount to some cloudiness in central Oregon in 
the afternoon. Winds will be generally light though the Columbia 
Gorge and Kittitas valley will see 15-20 mph winds on Sunday 
afternoon. Temperatures will be mainly in the mid 70s to mid 80s 
Sunday then warm to the upper 70s and 80s Monday and Tuesday. 
Wednesday will be in 80s and lower 90s. Perry

AVIATION...00Z TAFs...A band of precipitation is crossing Central
OR, bringing MVFR conditions to BDN/RDM through 01-02Z. The band 
will cross eastern OR/WA this evening, with low end VFR in showers 
for PSC/PDT/ALW from 01-04Z. Will use VCSH for DLS/YKM til 03Z as 
most of the activity will be to the south and east. After 04-06Z, 
clouds will scatter out for all ports, with SKC by 12Z. Wind gusts 
to 25 KT can be expected along the band this evening, subsiding by 
the overnight. 


PDT  55  80  51  85 /  80   0   0   0 
ALW  59  81  57  85 /  80   0   0   0 
PSC  59  85  56  88 /  70   0   0   0 
YKM  51  82  53  86 /  30   0   0   0 
HRI  56  83  52  88 /  80   0   0   0 
ELN  53  79  53  84 /  20   0   0   0 
RDM  44  81  43  88 /  50   0   0   0 
LGD  52  78  47  85 /  80   0   0   0 
GCD  52  78  49  86 /  60   0   0   0 
DLS  56  79  56  86 /  20   0   0   0