Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 240517
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
1017 PM PDT Sat Sep 23 2017

updated aviation discussion

.SHORT TERM...A cool northerly flow continues as the upper level
trough moves off to the east and a ridge of high pressure builds in
from the west. There is some mid and high level clouds coming over
the top of the ridge which will impact mainly the northern part of
the forecast area overnight and Sunday. Otherwise mostly sunny skies
and light winds. Temperatures will be cold again overnight and then
2 to 5 degrees warmer on Sunday.

.AVIATION...06Z TAFs...VFR conditions will prevail for the next
24 hours. There will be some varying mid/high clouds. Winds will be
less than 10 kts.

&&

.PREV DISCUSSION... /issued 217 PM PDT Sat Sep 23 2017/

SHORT TERM...Tonight through Tuesday. Northerly flow continues
over the area today. Weak instability resulting in some cumulus
development over the mountains. This will diminish after sunset.
Otherwise expect partly cloudy skies this evening and overnight.
Temperatures will be cool with lows in the 30s to mid 40s. Upper
level ridge builds into the region Sunday with mostly sunny skies
and warmer temps. A weakening system will be moving through the
ridge Sunday night into Monday with increased mid and high level
clouds. The ridge strengthens again on Tuesday. Overall looks to a
period of fair weather with temperatures just a few degrees below
normal. Winds remain light. 94

LONG TERM......Tuesday Night through Saturday...An upper level
ridge will build off the Pacific Northwest coast Tuesday night. The
ridge will shift slowly east Wednesday and Thursday. Subsidence
from the ridge will produce warm days...clearing skies and light
winds. Strong radiational cooling will occur at night...especially
in mountain valleys including Seneca Meacham and Ukiah. As the
ridge axis moves east of the CWA Friday southwest flow aloft will
bring increasing moisture to eastern WA and OR. A weak front will
move through Canada Friday night. Since the dynamic lift will
remain in Canada the main effects will be a reversal of the
warming trend as upper level flow behind the front becomes more
zonal. Coonfield



&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  41  70  43  68 /   0   0   0  10
ALW  46  72  46  69 /   0   0   0  10
PSC  43  75  46  72 /   0   0   0  10
YKM  44  74  46  71 /   0   0   0  10
HRI  43  73  45  72 /   0   0   0  10
ELN  42  74  44  69 /   0   0   0  10
RDM  33  67  37  69 /   0   0   0   0
LGD  38  63  36  65 /  10   0   0  10
GCD  34  65  36  66 /  10   0   0  10
DLS  48  77  50  71 /   0   0   0  10

&&

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

$$

91/91/91



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