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Area Forecast Discussion (AFD)

Issued by Pendleton, OR (PDT)

FXUS66 KPDT 241637

Area Forecast Discussion
National Weather Service Pendleton OR
940 AM PDT Wed Apr 24 2019

.SHORT TERM...Today and tonight...A flat ridge of high pressure over 
the region will will build into a low amplitude ridge of high 
pressure. This will provide clear skies and warm temperatures today 
with fairly light winds. Clear skies will allow for some radiational 
cooling overnight so the eastern mountains, which were warm 
overnight due to cloud cover, will be a little cooler tonight. Only 
some minor changes made to the morning forecast update. 

AVIATION...18Z TAFs...VFR conditions expected through the period. 
Decreasing low/mid clouds over the eastern mountains this morning 
behind a departing short wave. Will see an increase of cirrus 
overnight into tomorrow. Winds this morning of 10-15kts at DLS, YKM 
and PDT, otherwise, expect winds less than 10kts through the period.


.PREV DISCUSSION... /issued 431 AM PDT Wed Apr 24 2019/ 

SHORT TERM...Today through Friday. A disturbance should remain to
our east and dry conditions will prevail over the region today. A
weak ridge of high pressure will continue to influence the areas 
weather into Friday. A disturbance will approach wa/or with 
increasing clouds along with a few showers on Friday afternoon 
over the eastern forecast area. Otherwise afternoon temps will 
remain above normal today and Thursday with slightly cooler temps 
expected Friday with the incoming weather system. 

LONG TERM...Friday Night through Wednesday..Friday night and 
Saturday the Pacific Northwest will be under a northwest flow aloft 
and with little in the way of disturbances, the area will be dry 
aside from a few upslope showers along the Washington Cascade crest. 
Saturday night (ECMWF) or Sunday (GFS), a stronger low will move 
across southern British Columbia/northern Washington and deepen the 
trough before exiting rapidly to the east. Most of the energy from 
the low will remain to the north of us. The main impact will be 
breezy winds Sunday afternoon and evening in the Columbia Basin and 
adjacent valleys though there will continue to be a slight chance of 
light showers along the Washington Cascade crest and eastern Oregon 
mountains. Models diverge at this point but in general keep some 
form of trough over the area with a northerly flow through 
Wednesday. This will keep the lower elevations dry and there will be 
a slight chance of rain and snow showers over the mountains with 
snow levels fluctuating between 3000 and 4500 feet. Precipitation 
amounts will be light, so the mountains should just see a dusting of 
snow at times. Temperatures will be in the lower to mid 60s in the 
lower elevations and in then upper 40s and 50s in the mountains. 


PDT  68  43  71  48 /   0   0   0   0 
ALW  70  44  73  51 /   0   0   0   0 
PSC  73  45  75  51 /   0   0   0   0 
YKM  70  44  71  49 /   0   0   0   0 
HRI  72  44  74  50 /   0   0   0   0 
ELN  65  39  68  46 /   0   0   0  10 
RDM  71  40  74  41 /   0   0   0   0 
LGD  65  38  72  45 /   0   0   0  10 
GCD  68  41  75  45 /   0   0   0   0 
DLS  72  45  75  49 /   0   0   0   0