Area Forecast Discussion
Issued by NWS Pendleton, OR

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019
FXUS66 KPDT 230538
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
1037 PM PDT Fri Sep 22 2017

UPDATED AVIATION DISCUSSION

.SHORT TERM...Tonight and Saturday...The upper level trough is
centered from western Montana to northern Nevada. This is placing
the forecast area on the backside of the trough under a cool
northerly flow. There continue to be a few showers over the eastern
portion of the forecast area this evening but expect them to
dissipate by midnight leaving partly to mostly cloudy skies over the
forecast area and another chilly night. Saturday the upper level
trough ever so slowly will continue moving east as an upper level
ridge builds into the Pacific Northwest from the west. This will
keep the cool northerly flow in place with just a slight warming of
temperatures and most of the showers east of the forecast area.

.AVIATION...06Z TAFs...An upper trough over the eastern portion of
the region will keep partly to mostly cloudy skies at 5k-12k feet
AGL over the area through morning then begin clearing. Winds will be
less than 10 kts.

&&

.PREV DISCUSSION... /issued 400 PM PDT Fri Sep 22 2017/

SHORT TERM...Tonight through Monday. Upper low remains centered
over Idaho with northerly flow across the forecast area. Satellite
shows a fair amount of clouds. Weak instability combined with
upslope flow will keep skies mostly cloudy over central and
northeast Oregon through the evening with isolated showers. The
remainder of the forecast area will be partly to mostly cloudy
with mid level clouds rotating around the upper low. Gradual
clearing is expected overnight. With a cold airmass remaining over
the area low temperatures will be in the 30s to lower 40s. An
upper level ridge centered offshore will build into the Pacific
northwest this weekend. This will bring a warming trend for the
daytime temperatures with highs in the 60s to mid 70s. Overnight
lows will still be cool with 30s and 40s. Skies will be partly
cloudy. A weak system will move through the ridge Sunday night
into Monday with increased cloud cover. Mostly mid and high level
clouds. 94

LONG TERM...Monday Night through Friday...An upper level trough
will be over the Pacific Northwest through the long term period.
Initially the ridge will be centered offshore and this will allow a
weak disturbance to ride over the ridge Monday night. There will be
a slight chance of showers in the Washington Cascades Monday night
while the rest of the area will be dry with partly to mostly cloudy
skies. After that, the ridge will strengthen and move overhead by
Thursday morning with dry conditions, light winds and mostly clear
skies expected Tuesday through Friday. With the strengthening ridge
over the area, there will be a warming trend through the long term
period. Temperatures on Tuesday will be in the lower to mid 70s with
60s in the mountains. Temperatures will increase a degree or two
each day ending up in the upper 70s and lower 80s with mainly 70s in
the mountains on Friday. Nighttime temperatures will remain cool
with lows in the upper 40s to lower 50s in the lower elevations and
in the mid 30s to mid 40s in the mountains. Perry



&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  42  66  41  69 /  20   0   0   0
ALW  45  67  44  71 /  20   0   0   0
PSC  46  71  41  74 /  10   0   0   0
YKM  45  70  42  73 /  10   0   0   0
HRI  43  69  42  73 /  10   0   0   0
ELN  46  68  41  72 /  10   0   0   0
RDM  35  64  33  68 /  10   0   0   0
LGD  37  61  35  65 /  20  10  10   0
GCD  37  62  35  66 /  20  10  10   0
DLS  47  71  46  75 /  10   0   0   0

&&

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

$$

91/91/91



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