Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 300527
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
1027 PM PDT FRI AUG 29 2014

.SYNOPSIS...
The Labor Day weekend will be cooler than normal with locally
breezy conditions over portions of central and eastern
Washington. With the exception of some isolated mountain showers,
the majority of the Inland Northwest will remain dry through the
weekend. A continuation of the cool weather pattern is expected
through next week. The best chance for showers and thunderstorms
will probably occur in the Wednesday or Thursday time frame.

&&

.DISCUSSION...
Update: Satellite shows an upper level trough descending into the
Inland Northwest with a mid level front over southeast Washington
extending northeast through Spokane and the Idaho Panhandle. The
lower levels are dry and most of the returns on radar with the
front have been virga with rain evaporating before reaching the
ground. The area that is most likely to see spotty light showers
is from the Blue Mountains extending northeast through Lewiston,
Camas Prairie, and Central Panhandle Mountains. The NAM shows a
narrow ribbon of elevated instability with 700-500mb theta-e lapse
rates near -1 C/KM in these areas. Radar trends have been trending
towards more convective high based cells in this area with even a
few lightning strikes noted on radar south of Pendleton. The best
instability should remain south and east of the Camas Prairie per
GFS and NAM solutions so for now will not put any nocturnal
thunder in the forecast.

Some minor updates to sky cover and low temperatures have also
been made.  Cloud cover tonight is expected to be most extensive
along and south of Interstate 90 as a secondary wave now moving
into SW Washington and NW Oregon tracks east of the Cascades. Also
while pressure gradients will ease overnight with decreasing
winds...winds in the Upper Columbia Basin, Spokane area, and
Palouse should stay slightly elevated in the 5-10 mph range. Thus
have raised low temps slightly for most areas.  JW

&&

.AVIATION...
06z TAFS: VFR conditions are expected to continue through 06z
Sunday. A weak cold front will continue to pull away from the area
tonight with winds decreasing winds. Behind the front an increase
in low level moisture Saturday morning and upslope flow into the
high terrain in southeast Washington will result in an area of
stratocumulus but CIGS at PUW should remain VFR. A few showers are
possible tonight around KLWS but most of these should evaporate
before reaching the ground. On Saturday afternoon as the
atmospheric begins to destabilize especially near the Canadian
border more showers are expected to develop over the mountains.
Winds will become gusty again Saturday afternoon. JW

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        54  73  50  70  52  73 /   0   0  10  10  10  10
Coeur d`Alene  52  72  47  69  48  72 /   0   0  10  10  10  10
Pullman        53  72  45  71  46  73 /  10  10  10  10  10  10
Lewiston       61  78  54  77  56  80 /  20  10  10  10  10   0
Colville       46  76  44  73  44  77 /  10  10  10  10  10  10
Sandpoint      51  70  42  68  44  69 /  10  10  20  10  20  10
Kellogg        52  68  47  66  49  70 /  10  10  20  20  20  10
Moses Lake     52  79  50  77  50  80 /   0   0   0   0   0   0
Wenatchee      58  77  57  76  57  79 /   0   0  10   0   0   0
Omak           52  79  51  75  51  79 /  10  10  10  10  10   0

&&

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

$$




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