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Area Forecast Discussion (AFD)

Issued by Pendleton, OR (PDT)

FXUS66 KPDT 170858

Area Forecast Discussion
National Weather Service Pendleton OR
158 AM PDT Wed Apr 17 2019

Today through Friday night...A weak short wave was moving across 
the area early this morning. There were a few light returns on 
radar an the latest high resolution guidance indicates these could
linger for the next few hours before dissipating by sunrise. 
After that, the upper ridge over the pacific nortwest is expected 
to become further entrenched and strengthen so a warming trend is 
expected through Thursday with little in the way of 
precipitation. On Thursday, high temperatures will be well into 
the 70s in the valleys.

By Friday, the ridge will break down and a cold front will
approach from the west, reaching central and eastern Oregon by
afternoon and evening, bringing the next chance of rain. At this
point, this looks to be a fairly quick moving feature, so rainfall
amounts do not look to be very high. There will also be some pick
up in the wind with the approach and passage of the front.
Precipitation should be coming to an end Friday night.  

The lack of rainfall over the next few days will be helpful to the
rivers, however snowmelt from warning daytime highs and any
rainfall received on Friday will cause additional rises, so we
will continue to monitor the hydrological situation.

Saturday through Wednesday...Saturday and Sunday will be cooler and 
mostly dry outside of some lingering scattered showers over the 
Blues associated with departing cold front early Saturday.

Will see a return to mountain showers Monday/Tuesday with moistening 
westerly flow, but think the lower elevations will remain largely 
rain shadowed. A more substantial system looks to arrive Wednesday 
afternoon with at least a slight chance of some lower elevation rain 
for much of the area with better chances limited to the Cascades and 
Blues. Mid-level lapse rates increase ahead of the front which may 
support some isolated thunder over the eastern mountains, but will 
leave out for now given rather substantial run to run/inter-model 
timing differences. Gradients along and behind the front should 
support at least breezy if not windy conditions with FROPA Wednesday 
afternoon/evening. Peck


12Z TAFs...050-100 ceilings will continue to spill over the ridge 
off the PacNW coast through the afternoon. Skies clear overnight 
with the ridge amplifying over the region and shutting off the 
moisture. Winds 10-15KTs at DLS/PDT/PSC, less than 10KTs at 
remaining terminals becoming light overnight. Peck


PDT  65  47  75  52 /  20  10  10  20 
ALW  66  48  75  56 /  20  10  10  20 
PSC  71  49  79  57 /  10  10  10  10 
YKM  68  47  77  52 /  10  10  10  20 
HRI  69  50  78  55 /  10   0  10  10 
ELN  61  44  71  49 /  10  10  20  30 
RDM  65  44  76  48 /  10   0  10  10 
LGD  58  41  71  48 /  20  10  10  10 
GCD  60  39  72  46 /  20  10  10  10 
DLS  66  47  76  54 /  20  10  10  20