Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 171158
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
458 AM PDT Thu Aug 17 2017

.SYNOPSIS...
Our warm and dry weather pattern is expected to persist through at
least the early part of next week. Breezy and dry winds on Friday
will raise concerns for wildfires. Our weather on Monday should be
favorable for good views of the eclipse with mainly clear skies.

&&

.DISCUSSION...
Today through Friday night...A dry westerly flow will persist
resulting in mostly clear skies and near normal temperatures. Main
issues continue to be smoke/fire weather related. An active brush
fire...Monument Hill...northeast of Quincy will produce areas of
smoke this morning across the Columbia Basin with possibly some
smoke reaching the Spokane/Coeur d`Alene area. Smoke from BC fires
as well as Diamond Creek may also be drawn south into the
northern valleys this morning. Then this afternoon a weak short
wave ridge moves overhead with winds shifting to the southwest at
5-10 mph over most of the area. On Friday an upper trough swings
into British Columbia sending a dry cold front through the area in
the evening. This will lead to breezy pre-frontal southwest winds
over much of the area Friday afternoon...with locally windy
conditions near the Cascades developing by early Friday evening
with the front passage. This combined with low relative humidity
for the Wenatchee area has prompted a fire weather watch. The
western Columbia Basin (Waterville Plateau, Ephrata areas) and
Kittitas Valley (Ellensburg) may also come close but for now will
limit watch to the Wenatchee area where confidence is highest of
critical wind/rh thresholds being met. JW

Saturday and Sunday: The weather for the weekend will feature near
average temperatures, relatively light winds, and mostly clear
skies. A broad 500mb trough over western Canada will establish a
dry westerly flow over the Pacific Northwest Saturday and Sunday. A
push of north or northwest winds on Saturday will have the
potential to produce smoky skies for our counties along the
Canadian border. British Columbia continues to be a large source
of wildfire smoke, and 10 to 15 mph winds down the Okanogan Valley
on Saturday morning have the potential to bring smoke down from
B.C. As north winds lessen Saturday afternoon into Sunday, sources
of smoke closer to home will become our sources for smoke. Fires
like Diamond Peak (north of Twisp), Bridge Creek (north of
Keller), North Fork Hughes (near Priest Lake), and Norse Peak
(west of Yakima). For these fires, warm and dry winds Friday will
have the potential to increase fire activity which may contribute
to issues with smoke over the weekend into Monday.

Monday (Eclipse Day): An upper level high pressure ridge will
amplify over the Pacific Northwest on Monday. With the exception
of a few high cirrus clouds, views of the eclipse should be
unobstructed for residents of Oregon, north Idaho, and eastern
Washington. Surface pressure gradients will weaken under our
strengthening ridge. Smoke dispersion Monday may become an issue
depending on local fire activity.

Tuesday and Wednesday: At this time, it looks like Tue and Wed
will be the warmest days of next week. Widespread 90s will likely
return to the Inland Northwest. We will be closely monitoring the
potential influx of monsoonal moisture from the south which could
mean the chance for showers and thunderstorms by mid to late week.
/GKoch

&&

.AVIATION...
12Z TAFS: Mostly clear skies and terrain driven winds generally
less than 10 mph are expected at the TAF sites through 12z Friday.
Patchy wildfire smoke will continue across the region but VFR
conditions are expected for all TAF sites.  JW

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        84  59  86  58  82  58 /   0   0   0   0   0   0
Coeur d`Alene  84  54  86  54  81  54 /   0   0   0   0   0   0
Pullman        82  53  85  55  81  54 /   0   0   0   0   0   0
Lewiston       90  61  93  62  89  62 /   0   0   0   0   0   0
Colville       87  52  88  52  85  51 /   0   0   0   0   0   0
Sandpoint      83  48  84  49  82  48 /   0   0   0   0   0   0
Kellogg        80  52  83  52  80  52 /   0   0   0   0   0   0
Moses Lake     89  55  93  58  87  55 /   0   0   0   0   0   0
Wenatchee      89  63  91  63  86  62 /   0   0   0   0   0   0
Omak           92  59  92  59  87  58 /   0   0   0   0   0   0

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...None.
WA...Fire Weather Watch from Friday afternoon through Friday evening
     for East Washington Central Cascade Valleys (Zone 677).

&&

$$


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