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Area forecast discussion
National Weather Service Spokane Washington
437 am PDT Thu Aug 22 2019

Synopsis...
shower chances linger over Idaho today, with limited chances
along the Canadian border Friday afternoon. Expect breezy
conditions this weekend, especially Saturday. Temperatures will
be cooler through early next week, with highs in the upper 70s and
80s, before warming later next week. Otherwise the weather looks
mostly dry.




&&

Discussion...
today through Friday night: shower chances shift east today,
with drier weather tonight, before the next limited shower threat
moves across the north Friday. Today the upper trough will
continue to move east. Scattered to numerous showers over the
Idaho Panhandle this turn isolated this afternoon. Other isolated
showers will be possible over the northeast mountains. Limited
instability over the central Panhandle will also lead to a
thunderstorm threat but the risk will only be slight. Expect
partly to mostly cloudy skies this morning, including some
stratus/low clouds over eastern Washington and north ID, before skies
start to clear this afternoon and evening with drier air coming in
with shortwave ridging. Winds will remain locally breezy outside
of the sheltered Northeast Mountain valleys. Expect northerly
winds down the Okanogan Valley and west to southwest winds across
Columbia Basin into the Palouse/Spokane area. Speeds of 5-10 mph
with gusts to 15 mph will be possible here. Overall nothing too
significant, but noticeable. Temperatures will be slightly below
normal today with cooler air on the backside of the upper trough.

Going into Friday the area will be in a zonal (westerly flow)
with the next shortwave system moving in on 110kt+ jet stream. The
core of the lift remains north of the border. Yet still some
crosses the northern mountains to interact with some deeper
moisture near the Canadian border to bring shower chances to these
areas in the afternoon. Elsewhere look for some middle to high
clouds but otherwise dry weather. The precipitation threat and
clouds decrease Friday night. Winds will become breezy as the day
progresses into evening, especially over through the Cascades into
the western Columbia Basin late on the backside of the trough.
/Cote'

Saturday through thursday: nearly zonal flow aloft will continue
over the Pacific northwest through the weekend. At this stage, dry
weather is expected across the region as weather systems remain
north of the Canadian border. These systems are likely to tighten
the pressure gradient however. Breezy west to southwest winds are
possible across the east slopes of the Cascades, Waterville
Plateau, the Palouse, and the Spokane area. Both Saturday and
Sunday could be breezy days. Temperatures through Sunday will be
within a few degrees of normal for this time of year.

Monday through thursday: high pressure will begin to amplify over
the eastern Pacific early next week, with northwesterly flow over
the inland northwest. Shortwave energy may clip far northern Idaho
during this time, and bring a slight chance of showers. High
pressure will then likely build inland toward the middle of next
week, bringing a warmer than normal temperatures across the
forecast area. /Dang



&&

Aviation...
12z tafs: MVFR ceilings over geg-sff-Coe this morning will be the
biggest concern for our taf sites these next 24 hours. Currently,
tafs indicate VFR conditions for all locations by 16-17z, but am
not extremely confident on this timing. MVFR ceilings could very
well stick around for an additional hour or two. Took prevailing
MVFR ceilings out of puw this morning but if westerly winds pick
up they could see low ceilings through mid-morning. By this
afternoon, high confidence VFR conditions will prevail for all
locations with light winds. /Wilson





&&

Preliminary point temps/pops...
Spokane 79 54 82 55 82 52 / 10 0 10 0 0 0
Coeur D'Alene 77 53 81 55 80 51 / 20 0 10 0 0 0
Pullman 76 48 81 52 80 48 / 10 0 10 0 0 0
Lewiston 82 58 88 62 88 58 / 10 0 0 0 0 0
Colville 86 46 86 45 87 43 / 20 0 10 0 0 0
Sandpoint 76 51 79 51 79 48 / 50 0 10 10 0 0
Kellogg 73 55 79 57 77 54 / 40 10 10 0 0 0
Moses Lake 84 53 86 55 86 53 / 0 0 0 0 0 0
Wenatchee 83 60 85 61 83 59 / 0 0 0 0 0 0
Omak 85 57 84 56 85 54 / 0 0 10 0 0 0

&&

Otx watches/warnings/advisories...
Idaho...none.

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