Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 040942
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
242 AM PDT Sat Apr 4 2020

.SYNOPSIS...
Unsettled and cool weather will persist into early next week.
Expect hit or miss showers over the Inland Northwest, except for
Saturday which looks dry. Occasional light accumulations of snow
will occur during late night and early morning hours. Drier
conditions develop Tuesday onward, with some milder temperatures.



&&

.DISCUSSION...
Today: The region will be in a dry slow between the shortwave
trough for yesterday and the Low currently positioned off the
coast of Oregon. A zonal flow will push upper level moisture into
the region but is only expected to produce some mid to upper level
clouds throughout the day. Models are keeping the region precip
free and slightly warmer than the yesterday. Winds will be fairly
calm through the morning but increase into the low teens as the
day progresses. Highs are expected in the 40s to low 50s.

Tonight and Sunday: The low as shifted to the Border of California
and Oregon and will push a warm, saturated shortwave into the
region during this period. Models are in fairly good agreement on
the timing but differ on the moisture associated with the wave.
Determining the precip type is tricky as the 850mb temps start a
few degrees above 0C but then dip overnight to a couple degrees
below 0C. Snow levels will vary with around 3000ft to 4500ft South
of I-90 and around 1800f to lower for North of I-90. The Southern
portions of Washington and the Lower Idaho Panhandle could start
to see some light rain showers starting during the early evening
hours. For areas North of I-90, the slower the moisture moves
into the area the better chance for snow. The Leeside of the
Cascades will be mostly spared of the precip except for some
slight chance of isolated showers. As for snow amounts for Eastern
Washington and Idaho Panhandle, most low lying areas could see a
dusting to up an inch by Sunday morning. Higher terrains could get
one to four inches. The GFS and NAM are hinting at a decent band
possible for the Spokane to Lookout Pass. Confidence is low on
this formation but areas could see localized higher amounts near
two inches. The moisture is expected to continue to move through
the Idaho Panhandle through Sunday and keep rain showers for the
valleys and snow for the mountains before drying out overnight.
Highs will be in 50s to low 60s. Lows expected in the 30s. /JDC


Monday and Tuesday: Monday wraps up the endless unsettled weather as
an upper trough moves east and sets up a broad ridge over the
Northwest. As the upper low breaks off early Monday, the remaining
trough will bring a chance for precipitation through the afternoon.
This precipitation will be in the form of rain/snow in valley
locations and light snow in the mountains of far eastern Washington
and ID Panhandle. Little to no accumulation expected. By late
Monday, the dry and mild pattern begins as the ridge builds over the
region. The eastern Cascades, Blues, and Palouse may have a breezy
Monday and Tuesday, but nothing looks of concern.

Wednesday through Saturday: Dry and mostly clear conditions continue
through most of the week. As a low moves into Canada, models are
hinting at this precipitation dropping into parts of the Inland
Northwest late Friday - Sunday. With little agreement between
models, low confidence in the chance and amount of precipitation as
the week wraps up. If the temperatures continue to remain mild,
which they should, most precipitation will be in the form of rain
other than at the mountain crests. Temperatures will be back near or
slightly above normal. Varying models show quite a range in how warm
we will get, but there is agreement that we will have a warming
trend back into near normal temperatures. JS

&&

.AVIATION...
06Z TAFS: Snow showers over the Idaho Panhandle will continue to
diminish as the trough shifts further East. A cool, dry airmass is
moving into the region. Boundary layer moisture expected to
product mid level stratus but TAF sites are expected to be VFR
for the next 24 hours. /JDC


&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        47  32  51  33  54  34 /   0  50  30  10  10   0
Coeur d`Alene  48  32  51  34  52  34 /   0  50  30  10  30   0
Pullman        49  34  53  36  52  35 /   0  60  40  20  30   0
Lewiston       56  40  60  41  57  40 /   0  50  20  20  30   0
Colville       50  30  53  32  57  32 /   0  20  20  10  10   0
Sandpoint      46  32  48  34  49  34 /   0  30  50  20  30   0
Kellogg        45  32  48  35  48  34 /  10  60  60  30  40  10
Moses Lake     52  35  59  34  62  35 /   0  30  10  10  10   0
Wenatchee      49  36  57  36  59  37 /   0  20  10  10  10   0
Omak           50  33  55  34  57  35 /   0  10  10  10  10   0

&&

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

&&

$$


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