Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 191012
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
211 AM PST Sun Nov 19 2017

.SHORT TERM...Today through Tuesday...The weather in the short term
will be fairly active with a couple of warm fronts moving up across
the forecast area over the top of a flat upper ridge. At first snow
levels will be low enough for some accumulating snow in the Cascades
and the higher peaks of the Blue Mountains. But then snow levels
will be rising to above pass levels by Tuesday. Before then there
may be some substantial snowfall...but not enough for any advisories
at this time. Snow levels will be around 4000-5000 feet MSL today...
gradually rising to between 8000-9000 feet MSL by Tuesday. Today
will begin dry and then rain and mountain snow will move in from the
northwest and continue through tonight into Monday...and pretty much
through the rest of the short term forecast period. There will be a
temporary lessening of the precipitation late Monday...but it will
still remain unsettled on Monday as the next warm front approaches
the region. Tuesday looks to be wet and warmer as the next warm
front moves over the top of the flat upper ridge...which will almost
be a zonal flow. Will need to monitor the amount of rainfall...
especially in the Cascades where there are a number of forest fire
burn scars from this past summer. The Cascades can expect up to from
a half inch to an inch of rain during the short term period with
locally heavier amounts. It will be locally breezy beginning late
this morning...with windy conditions in the lower Grande Ronde
Valley and through Ladd and Pyles canyons. 88

.LONG TERM...Tuesday night through Sunday...A moist southwesterly
flow will persist across the region through the period on the back
side of an upper level ridge centered over nwrn Mexico. Although
there will be no major storm systems...a series of weak impulses
embedded in the flow will provide periods of rain each day. Snow
levels will be quite high especially mid week when they will be as
high as 10000 feet MSL. Snow does not look to be an issue right
through next weekend with snow levels remaining mostly above 6000
feet MSL. High temperatures on Wednesday and Thursday will be close
to 20 degrees above normal...with readings in the 60s lower
elevations and 50s mountains...before slightly cooler air filters
into the region late in the week. However even after this occurs
temperatures will remain above normal for this time of year. It will
be breezy to locally windy along the ridge tops with gusty south
winds Wednesday into Thursday. 78

&&

.AVIATION...12Z TAFS...VFR Conditions will prevail through the
forecast period. Extensive high clouds today will lower to mid
clouds by this evening. After 06Z Monday areas of rain will develop
with cigs around 5000 feet AGL. Winds will be mostly southerly at 10
kt or less today but pick up this evening at 10-20 kt except closer
to 15-25 kt at KRDM, KBDN, and KALW. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  51  42  54  47 /   0  70  60  40
ALW  54  46  56  49 /   0  80  70  50
PSC  52  42  56  44 /   0  60  30  40
YKM  47  35  53  40 /  10  50  30  30
HRI  51  42  55  45 /   0  60  40  40
ELN  44  34  49  38 /  10  60  30  40
RDM  52  38  55  45 /   0  50  70  40
LGD  48  39  50  44 /   0  80  80  40
GCD  50  40  50  42 /   0  50  60  40
DLS  50  42  53  45 /  10  80  70  50

&&

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

&&

$$

88/78/78



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