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Area Forecast Discussion (AFD)

Issued by Pendleton, OR (PDT)

                            
000
FXUS66 KPDT 210446 CCA
AFDPDT

Area Forecast Discussion...Corrected
National Weather Service Pendleton OR
842 PM PDT Tue Aug 20 2019

.UPDATE...
Not much to speak of tonight, except increasing high clouds in
advance of an approaching cold front. Made adjustments to cloud
cover and changed winds tonight and early Wednesday based on the 
latest guidance, also some minor adjustments to temps.


&&

.AVIATION...
06Z TAFS....VFR conditions through the TAF period. Quiet tonight.
Winds should slowly decrease overnight but remain quite gusty at 
DLS.  Wind will increase again on Wednesday with gusts 15 to 30 kts 
possible in the afternoon and evening as a cold front crosses the 
area from west to east. The best chance of any showers would be at 
DLS, RDM and BDN but not heavy enough to reduce CIGS or VSBYS. 
However, by afternoon at DLS RDM, BDN, YKM and evening elsewhere a 
midlevel CIG is anticipated.  Some lower CIGS are psbl, but 
confidence is not high enough to forecast at this time.

&&

.PREV DISCUSSION... /issued 421 PM PDT Tue Aug 20 2019/ 

AVIATION...
00Z TAFS...VFR conditions to continue through tonight and into
Wednesday. Mainly high clouds tonight and early Wednesday will
thicken and lower, especially for DLS, RDM and BDN with a midlevel
CIG by afternoon. Otherwise, gusty winds will continue through the
evening before decreasing to mainly 10 kts or less. Gusts will
return on Wednesday mainly 15 t0 20 kts at PDT, BDN and RDM and up
to 25 kts at DLS.

PREV DISCUSSION... /issued 133 PM PDT Tue Aug 20 2019/ 

SHORT TERM...Tonight through Friday night...An upper level ridge of 
high pressure will be over the region tonight with some high clouds 
passing through the area. The ridge will move off to the east on 
Wednesday as an upper level trough moves inland and pushes a cold 
front through the forecast area in the afternoon and evening. Main 
impact of the front will be some increasing westerly winds behind 
the front. There will also be some rain showers ahead of the front 
and a slight chance of thunderstorms over eastern Grant and Wallowa 
counties through the evening. Cooler air will filter into the region 
Wednesday night and Thursday as the upper level trough passes over 
the region. There will be some lingering locally breezy conditions 
Thursday along the east slope of the Cascades. Temperatures will 
begin to rebound Friday as a dry flat westerly flow returns.   

LONG TERM...Saturday through Tuesday...A quiet,dry pattern sets up 
for the weekend and early next week. Dominant flow across the region 
will be zonal/northwesterly through at least next Tuesday. This will 
keep temperatures near normal with afternoon highs in the mid to 
upper 80s for the lower elevations and 70s expected for the 
mountains. Locally breezy winds sustained between 10-20 mph with 
gusts ~30 mph are expected for Saturday and Sunday afternoon through 
the Columbia River Gorge, Columbia Basin, and Kittitas Valley and 
will diminish heading into early next week. Richards

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  62  88  56  80 /   0   0  30   0 
ALW  63  90  60  82 /   0   0  30  10 
PSC  62  90  61  84 /   0  10  30   0 
YKM  58  83  54  82 /   0  40  20   0 
HRI  63  90  57  83 /   0  10  30   0 
ELN  57  81  56  79 /   0  40  20   0 
RDM  52  87  46  81 /   0  20  30   0 
LGD  55  90  52  77 /   0   0  30  10 
GCD  58  92  54  80 /   0   0  30   0 
DLS  61  79  59  81 /   0  40  20   0 

&&

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

$$

77/75/77