Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 050539
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
1039 PM PDT TUE AUG 4 2015

.SYNOPSIS....
Cooler temperatures, continued breezy conditions, along with a
chance of showers and a few thunderstorms over the northern
mountains are expected through Thursday in the wake of a cold
front. Another threat of showers and thunderstorms arrives this
weekend, as yet another low pressure is expected to move into the
region.

&&

.DISCUSSION...
Update: A dry slot coming around a large closed low over Central
British Columbia will swing across Central and Eastern Washington
and the North Idaho Panhandle tonight. Meanwhile a short wave
trough over northern California will track northeast with a band
of elevated moisture/instability tracking across NE Oregon into
Central Idaho. Models indicate a swath of elevated instability
with NAM showing most unstable CAPE values of 100-200 J/KG from
Lewiston to Lookout Pass overnight. Infrared satellite as of 9 pm
was showing an area of increasing mid level cumulus in this area.
While an isolated thunderstorm is possible, only minimal CAPE
values should result in most areas seeing sprinkles or a brief
light shower. The forecast has been updated to expand the chance
of sprinkles from the Blue Mountains into the Central Panhandle
Mountains. If any lightning does occur, it most likely would be
dry due to fast storm motions and a dry low level air mass.

Elsewhere the dry slot coming around the BC low will result in
mostly clear to partly cloudy skies tonight with decreasing winds.
JW


&&

.AVIATION...
06Z TAFS: For tonight a few sprinkles or light showers are
possible near KLWS with the best chance of thunderstorms over the
Clearwaters southeast of KLWS as a weather disturbance tracks into
Central Idaho. Then an upper level low will skirt the Canadian
border on Wednesday with a chance of showers and isolated
thunderstorms over the northern mountains. An associated cold
front will result in breezy conditions after 18z Wed across the
region with windy conditions through the Cascade gaps and western
Columbia Basin (KEAT, KMWH TAF sites) with gusts up to 30-35 kts.
The strongest gusts are expected between 21z Wed- 03z Thu. VFR
conditions should continue at all TAF sites through 06Z Thursday.
JW


&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        61  80  57  77  56  86 /   0  10  10  10   0   0
Coeur d`Alene  59  80  55  77  53  86 /  10  10  10  10   0   0
Pullman        55  78  52  76  49  85 /  10  10   0  10   0   0
Lewiston       65  87  61  85  59  92 /  10  10   0  10   0   0
Colville       56  83  56  80  53  88 /  10  20  30  10   0  10
Sandpoint      54  80  52  75  46  83 /  10  10  20  20  10  10
Kellogg        59  78  53  75  51  85 /  10  10  10  10   0  10
Moses Lake     61  85  57  83  55  89 /   0   0  10   0   0   0
Wenatchee      66  83  63  84  63  89 /   0  10  10   0   0   0
Omak           60  84  55  84  55  89 /   0  20  20  10  10   0

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...None.
WA...Red Flag Warning until 9 PM PDT Wednesday for East Washington
     Central Cascade Valleys (Zone 677)-East Washington Northern
     Columbia Basin (Zone 673)-East Washington Palouse and
     Spokane Area (Zone 674).

&&

$$



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