775
FXUS66 KOTX 180453
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
953 PM PDT Tue Sep 17 2024

.SYNOPSIS...

Some light rain will persist at times over north Idaho and the
eastern third of Washington through early Wednesday. Conditions
will trend drier toward the end of the work week, then
precipitation chances return for the weekend.

&&

.DISCUSSION...
Evening update: Made some updates based on radar trends for a few
lingering bands of light showers associated with mid level
instability on the back side of a departing low pressure system.
These isolated showers were occurring from near Priest Lake south
through Liberty Lake and the WA Palouse. Steady stratiform rain
has brought heavier rain amounts south of Lookout Pass with one
station in SE Shoshone County picking up 1.28" of rain since 2 PM
this afternoon. Rain in this area will be decreasing overnight as
the low continues to pull away from the region. JW

&&

.AVIATION...
06Z TAFS: Light showers will continue through 07-09z from near
KSFF/KCOE south to near KPUW. Not much impact from these for the
TAF sites, although will be monitoring the potential for IFR
stratus Wednesday morning due to a moist boundary layer and
upslope boundary layer winds into KGEG/KSFF/KCOE. Current
probabilities are under 50% at these TAF sites so prevailing
conditions were kept VFR. Any stratus that develops will lift and
erode by 17-18z, with flat stratocumulus in the afternoon.

FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: HREF model shows a
60-70% chance of IFR stratus between 12-16z south of Spokane
(Cheney, Spangle areas), decreasing to a 40% chance over GEG, with
a 20% chance at KSFF/KCOE. With favorable low level winds and some
light showers further moistening the boundary layer these
probabilities seem reasonable. JW

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        49  75  49  76  46  72 /  10   0   0   0   0   0
Coeur d`Alene  48  71  48  74  46  70 /  10  10   0   0   0   0
Pullman        45  69  44  73  44  65 /  10  10   0   0   0   0
Lewiston       54  78  53  80  53  75 /  10  10   0   0   0   0
Colville       38  77  39  76  37  71 /   0   0   0   0   0   0
Sandpoint      46  69  44  72  44  68 /  10  10   0   0  10  10
Kellogg        49  67  50  72  48  65 /  20  10   0   0   0  10
Moses Lake     48  79  46  78  46  73 /   0   0   0   0   0   0
Wenatchee      55  79  53  78  54  72 /   0   0   0   0   0   0
Omak           51  82  51  81  47  75 /  10   0   0   0   0   0

&&

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

$$