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Area Forecast Discussion (AFD)

Issued by Pendleton, OR (PDT)

                            
000
FXUS66 KPDT 212054
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
155 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 
pattern. 

.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...Previous discussion...18Z TAFs...A system moving across 
the area today and this evening will bring increasing clouds to the 
area this afternoon and evening along with a few hours of rain 
showers possible. A few thunderstorms will be possible in far 
northeastern Oregon but will not affect any TAF sites. Ceilings will 
be broken to overcast above 5K feet AGL and will clear rapidly 
behind the system from 00Z-06Z. This system will be accompanied by 
increasing westerly winds today reaching 10-20 kts with gusts to 25-
30 kts after 20Z. Winds will drop below 12 kts at all TAF sites 02Z-
06Z. Perry


&&

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

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
&&

$$

91/83/83