Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 202319
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
320 PM PST Mon Nov 20 2017

...UPDATED AVIATION DISCUSSION...

.SHORT TERM...Tonight through Wednesday Night...A moist southwest
flow aloft will persist through this period. Snow levels will
increase above 9000 feet tomorrow and remain that high through the
rest of the short term period so the precipitation will be mainly
rain Tuesday through Wednesday night. A warm occluded front is
moving into the Blue Mountains and dissipating this afternoon. This
front will keep some rain along the NE OR mountains into the
evening. There are clearing skies behind the front. Winds aloft will
mix to the surface creating windy conditions across the Lower
Columbia Basin and ridgetops in the rest of the CWA this evening.
Another warm frontal system is located over southern OR this
afternoon. This system will occlude tonight as it moves NE across
OR. It will spread another round of rain across eastern OR
tonight...then spread more rain into eastern OR and WA Tuesday. By
Tuesday afternoon a slight break in precipitation will begin in
Central OR then spread north Tuesday evening. Another wave will
develop along the frontal band Wednesday with more rain. Confidence
is high in the overall pattern but there probably will be some
changes in timing that may affect the forecast. Higher winds aloft
may mix to the surface at times in eastern OR and along the WA
Cascades Tuesday afternoon through Wednesday. Since eastern WA and
OR remain in the warmer side of the these fronts temperatures will
remain well above normal with highs increasing to the upper 50s in
southeast WA and upper 50s to lower 60s in northeast OR Wednesday.
Coonfield

.LONG TERM...Thursday through Monday...An active weather pattern
will continue through the extended. It begins with a cold frontal
passage late Thursday with snow levels starting around 7000 to 9000
feet and lowering to 4000 to 6000 early Friday morning so only
expecting snow accumulation in the higher mountains. This will be
followed by a warm front Saturday night through Sunday and snow
levels rising back up to 6000 to 8000 feet. This will be followed by
a cold front on Monday and snow levels dropping back down to 4000 to
6000 feet. Overall the major transportation routes through the
forecast area will not see any major winter weather events during
this time.


&&

.AVIATION...00Z TAFS...VFR conditions tonight before a warm front
arrives early Tuesday bringing a return of lower clouds and
precipitation and possible MVFR conditions through the day. West to
southwest winds 10-20 KT diminishing this evening then south 5-15
kts Tuesday.


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  61  42  52  47 /  50  20  80  60
ALW  63  44  54  49 /  70  20  70  70
PSC  59  41  48  45 /  40  20  90  60
YKM  56  37  47  41 /  40  20  80  50
HRI  58  42  51  46 /  40  20  80  50
ELN  49  34  43  39 /  40  20  90  50
RDM  57  42  59  48 /  80  60  50  40
LGD  51  40  52  47 /  80  30  70  70
GCD  52  43  55  47 /  70  30  70  60
DLS  56  42  52  47 /  70  60  80  60

&&

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

$$

76/91/91


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