Area Forecast Discussion
Issued by NWS Spokane, WA

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097
FXUS66 KOTX 222208
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
308 PM PDT Fri Sep 22 2017

.SYNOPSIS...
A drying and warming trend is expected for the Inland Northwest
through next week. High temperatures through the weekend will
still be below normal with highs mainly in the 60s with the
warmest spots near 70. By the end of next week, look for
temperatures to surge well into the 70s.

&&

.DISCUSSION...
Tonight through Sunday night...An upper level trough located just
south and east of the area today across central and southern Idaho
into western Montana will slowly pull east through the weekend and
be replaced by a flat ridge of high pressure. This will lead to a
gradual warming trend into the weekend with a few lingering
mountain showers into Saturday. Sunday afternoon and evening a
weak wave tracks through the area bringing a band of mid and high
level clouds with a slight chance of showers over the North
Cascades. The lower level air mass over NE Washington and N Idaho
has dried out this afternoon with dew points falling into the
30s. This should limit fog potential tonight with much less
coverage compared to what was observed this morning.  JW

Monday through Friday...
By Monday afternoon, the deep trof will have moved off to our
east along the front range to the four corner region. An equally
high amplitude ridge wil be centered over the western US coast
with a weak disturbance rotating around it`s northern periphery.
This weak wave will likely bring some increased cloud coverage and
a few light showers to the mountains Monday afternoon/evening.
After that wave departs, the ridge shifts towards the coast and
eventually inland by midweek bringing back temperatures at or
above normal along with clear skies. The ridge looks to hold
strong through the end of the workweek. There are some indications
that it may last through the weekend but models diverge greatly
on the next trof skirting the region.

Adjustments to the forecast included nudging temperatures up a
few degrees under clear skies. Fire activity could increase given
the warm and dry days although night time RH recovery will be
excellent. Since high pressure will be dominating, local valleys
near active fires will likely experience reduced air quality by
the end of the week. /AB

&&

.AVIATION...
18Z TAFS: Morning has fog has burned off for the valleys of NE
Washington, N Idaho, and the palouse. The air mass will gradually
dry this afternoon and should result in much less fog development
tonight with VFR conditions favored for all TAF sites through 18z
Saturday. JW

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        44  62  42  64  46  66 /  10  10  10   0  10  10
Coeur d`Alene  40  60  38  64  42  66 /  10  10  10  10  10  10
Pullman        40  59  39  63  42  66 /   0  10  10   0   0  10
Lewiston       45  66  44  68  48  71 /  10  10   0   0   0  10
Colville       41  65  38  68  43  70 /  10  10  10  10  10  10
Sandpoint      40  59  35  63  41  65 /  10  10  10  10  10  10
Kellogg        37  55  35  61  41  63 /  10  10  10  10  10  10
Moses Lake     45  69  43  70  46  73 /   0   0   0   0   0  10
Wenatchee      49  70  48  71  50  73 /   0   0   0  10  10  10
Omak           44  69  42  71  44  73 /   0   0   0  10  10  10

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...None.
WA...None.

&&

$$



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