Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 240532
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
1032 PM PDT Sun Apr 23 2017

.SYNOPSIS...
Expect cool, breezy, and showery weather this week. The most
widespread precipitation will likely occur Tuesday night into
Wednesday with the potential for a half inch or more of rain over
portions of the Idaho Panhandle and southeast Washington. A ridge
of high pressure next weekend has the potential to bring the
region a day or two of drier weather.

&&

.DISCUSSION...
Evening update: The forecast has been updated for the rest of this
evening based on radar trends. Satellite shows the region under a
broad upper trough with the jet axis south of the region in
northern California placing Washington and north Idaho on the cool
and unstable side of the jet. As of 620 pm radar indicated a few
thunderstorms approaching Walla Walla and some lightning is
possible in the Blue Mountains and thus forecast was updated for
this. Also increased POP`s for the Lewiston and Pullman areas this
evening with HRRR holding together these showers as they come off
the Blue Mountains with a passing weak wave providing added lift.
Elsewhere showers are more isolated in nature with a somewhat dry
boundary layer with dew points in the lower to mid 30s and
temperatures mainly in the 50s. Latest HRRR shows showers a bit
more isolated or widely scattered this evening over most of
Central and NE Washington into the Idaho Panhandle with only weak
incoming forcing and instability. Thus some lowering of evening
POP`s were made. Increasing POP`s around midnight still on track
however for NE WA/N idaho as the weak wave tracks across the area.
JW

&&

.AVIATION...
06Z TAFS: A bands of showers passing south of KGEG earlier this
evening and has moistened the boundary layer. By Monday morning
as low level upslope flow occurs for the eastern TAF sites
(KGEG/KSFF/KCOE/KPUW) and the boundary layer continues to moisten
with light showers...MVFR conditions may develop. Meanwhile a
closed low off the Washington coast this evening drops into north
central Oregon by Monday evening. This will result in the brunt of
the showers on Monday south of the area...but all TAF sites will
be subject to an occasional shower with CIGS by afternoon mostly
VFR except KPUW where low level upslope flow in combination with
-SHRA may keep CIGS down at MVFR. JW

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        39  53  38  56  42  53 /  30  70  30  30  50  60
Coeur d`Alene  39  52  38  54  39  52 /  60  80  30  50  60  80
Pullman        40  52  38  55  42  53 /  60  70  50  30  60  80
Lewiston       43  57  42  60  46  58 /  60  50  50  30  70  60
Colville       38  55  36  57  41  54 /  40  40  20  50  60  80
Sandpoint      39  51  36  52  37  50 /  90  40  20  60  70  80
Kellogg        38  49  35  50  37  48 /  70  90  60  60  60  90
Moses Lake     43  59  39  62  45  61 /  20  20  20  10  40  20
Wenatchee      42  57  41  60  43  58 /  30  30  20  10  20  20
Omak           38  58  37  63  43  60 /  30  20  10  10  20  20

&&

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

$$


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