Area forecast discussion 
National Weather Service Pendleton or 
444 am PDT Sat Oct 22 2016 

Short through Monday night...a shortwave is moving 
across eastern Washington/or early this morning...with radar/obs showing 
scattered to numerous showers mainly from the Blue Mountains 
eastward. Activity further west continues to diminish as shortwave 
ridging begins to enter the region. Some patchy light fog is 
beginning to develop across the Washington Columbia Basin...and with 
conditions continuing to stabilize...think fog may thicken a bit 
and expand in coverage to portions of the or Columbia Basin by 
sunrise...but do not expect dense fog. Residual showers across 
the eastern mountains will end by sunrise/shortly thereafter 
as the shortwave ridge moves overhead...with partly cloudy skies 
generally prevailing today. With less cloud cover...expect 
temperatures to be warmer than yesterday...with highs this 
afternoon in the upper 50s/lower 60s for the lower elevations 
with mainly 50s for the mountains. 

For tonight into Monday...the region will be in between amplifying 
ridging to the east...and the next system approaching from the 
west. With the ridge progged to move very slowly east...this will 
result in the trough to the west remaining offshore. Initial 
shortwave energy will try to push onshore by Sunday 
think the east slopes of the Cascades will see some precip Sunday 
afternoon through Monday...but there will not be a significant 
push to the will leave most areas from a Yakima Valley 
to central Oregon line eastward dry. Surface pressure gradients 
will tighten as the low approaches...with breezy/windy conditions 
developing mainly across central Oregon. Expect temperatures 
slightly above seasonal norms. 

Monday night...models in general agreement pushing the trough 
onshore...with a more significant shortwave and deeper moisture 
in southerly flow. Will increase pops to high end chance/likely 
as the shortwave crosses the area. Seasonably mild temperatures 
will continue with significant cloud cover and south flow. 

Long term...Tuesday through Friday. Upper low remains centered 
offshore next week with several short waves moving through it. These 
short waves will spin up surface lows which will also remain off the 
coast. The flow aloft will be southwesterly and will maintain mild 
temperatures with fairly high snow levels at 6-8k feet. Skies will 
be mostly cloudy through the extended time frame with periods of 
rain. GFS and Euro have some significant differences on timing and 
placement of rainfall so have used a blend for now. Temperatures 
will continue to be above normal with highs in the 50s to mid 60s. 
Lows in the upper 30s and 40s. Could have some breezy to windy 
conditions Tue night into Wed as models all showing a fairly deep 
surface low off the Oregon coast with stronger winds aloft. 
Otherwise no significant winds expected through the period. 94 

Aviation...12z tafs. Patchy fog in the Columbia Basin will impact 
psc ykm this morning. Otherwise sct 050-080 with increasing cirrus 
later this morning and afternoon becoming bkn200. Patchy fog is 
possible again tonight after 08z in the Columbia Basin. Winds 


Preliminary point temps/pops... 
PDT 60 41 60 44 / 0 0 0 10 
alw 62 47 63 50 / 0 0 0 10 
psc 61 45 60 46 / 0 0 0 10 
ykm 62 41 61 41 / 0 0 10 20 
hri 62 42 61 45 / 0 0 0 10 
eln 58 40 58 41 / 10 10 20 20 
rdm 62 34 63 38 / 0 0 10 10 
lgd 59 40 66 43 / 0 0 0 10 
gcd 59 42 64 45 / 0 0 0 10 
dls 64 45 63 46 / 10 10 20 20 


PDT watches/warnings/advisories... 



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