Area Forecast Discussion
Issued by NWS Spokane, WA

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000
FXUS66 KOTX 270430
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
930 PM PDT Mon Oct 26 2020

.SYNOPSIS...
Temperatures will begin to moderate this week with near average
readings by the end of the week. Significant precipitation is not
expected this week. An incoming system increases chances for
light rain and mountain snow for the end of the week.

&&

.DISCUSSION...
The airmass is definitely modifying and changing just looking at
the temperatures. The 00z KOTX sounding had an 8C warming trend
over the last 24 hours. The nose of warmer air is quite evident
from 850mb to about 450mb. As the ridge of high pressure continues
to push in from the west this week, we can expect warmer air aloft
to slide over the cooler surface air at the ground where the
snowcover will continue to insulate the cooler air near the
surface. Overnight inversions will develop and trap low level
moisture resulting in low stratus or fog in lower valley areas.
Very light winds and mixing will not help to erode much of this
stagnant airmass through Thursday. As such, an air stagnation
advisory is in effect for portions of eastern Washington and
northern Idaho through later this week.

Better mixing will come with a frontal passage Friday. This front
however does not look overly cold and the available
moisture should remain confined to the Cascades and mountain areas
in far northern Washington. No updates to the forecast this
evening. /Dewey

&&

.AVIATION...
06Z TAFs: Thin high clouds will be present across northeastern
WA, northern ID and across the Cascades through Tue. Lower valley
stratus is expected to develop overnight under inversion
conditions and clear by mid morning with CIGs around 3-4k ft AGL
mainly for COE and locations north. Light diurnal winds will
continue through the TAF period under VFR conditions. /Dewey

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        18  41  21  46  25  48 /   0   0   0   0   0   0
Coeur d`Alene  20  42  24  47  29  49 /   0   0   0   0   0   0
Pullman        21  43  23  50  28  55 /   0   0   0   0   0   0
Lewiston       26  49  31  57  36  60 /   0   0   0   0   0   0
Colville       15  43  19  47  24  47 /   0   0   0   0   0   0
Sandpoint      22  41  25  46  29  45 /   0   0   0   0   0   0
Kellogg        22  44  29  51  35  50 /   0   0   0   0   0   0
Moses Lake     21  47  23  52  26  52 /   0   0   0   0   0   0
Wenatchee      29  50  34  55  36  52 /   0   0   0   0   0   0
Omak           24  45  30  49  33  50 /   0   0   0   0   0   0

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...Air Stagnation Advisory until 11 AM PDT Thursday for Central
     Panhandle Mountains-Lewis and Southern Nez Perce Counties-
     Lewiston Area-Northern Panhandle.

WA...Air Stagnation Advisory until 11 AM PDT Friday for East Slopes
     Northern Cascades-Northeast Mountains-Okanogan Highlands-
     Okanogan Valley-Waterville Plateau-Wenatchee Area.


&&

$$


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