Area Forecast Discussion
Issued by NWS Spokane, WA

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FXUS66 KOTX 190558
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
1058 PM PDT Wed Oct 18 2017

.SYNOPSIS...

Moderate precipitation will continue to fall tonight into Thursday
as a low pressure system slowly sags through the region. A cold
front will follow on Friday for showers, gusty winds and cooler
temperatures that will last through the weekend and into Monday. A
return to warmer temperatures and drier conditions is expected next
week.


&&

.DISCUSSION...
With a late evening update I increased winds from the northern
Moses Lake Area and up over the Waterville Plateau. There are a
few weather stations reporting winds of 20-30 mph with gusts to 45
mph. These winds are expected to decrease a little bit once the
rain gets going again overnight. I also slowed down the onset of
rain across the southeast portion of the region for tomorrow. The
00Z GFS and NAM model guidance is consistent with less isentropic
ascent over this area with the jet pivoting more meridionally.
This will result in a narrower band of precipitation along the
cold front than previously thought. The southern to central
ID Panhandle will likely pick up the bulk of its precipitation
tomorrow evening. /SVH

&&

.AVIATION...

06Z TAFS: A moist warm front with a modest 50 kt low level jet at
850 mbs will impact the region overnight into Thursday morning.
The low level jet will be focused primarily from around KDLS to
KHRI through the Columbia River Gorge, across the Upper Columbia
Basin and into the Spokane/Coeur d`Alene corridor. Low level wind
shear can be expected through this corridor with around 45 kt
winds possible down to between 1500 and 2000 ft agl at KMWH, KGEG,
KSFF, KCOE and KPUW. The swath of rain has dwindled a bit through
the evening, but this will fill in again by Thursday morning
mainly northwest of a line from KPSC to KSZT. The cold front will
take its time to push across with rain not expected to get into
KPUW and KLWS until late Thursday afternoon/evening. /SVH


&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        48  56  42  53  36  47 /  50 100  90  50  20  80
Coeur d`Alene  46  56  42  52  36  46 /  60  70 100  60  30  70
Pullman        46  60  42  52  37  49 /  10  20 100  50  40  80
Lewiston       48  65  46  59  40  53 /   0  10  90  40  20  80
Colville       46  56  44  55  34  46 /  90 100  90  40  30  80
Sandpoint      45  51  42  51  33  43 /  90 100 100  80  40  70
Kellogg        45  58  41  46  35  44 /  20  30 100  70  70  60
Moses Lake     50  60  43  61  35  51 /  40  80  40  20  10 100
Wenatchee      46  58  41  56  37  47 /  40  50  30  20  10 100
Omak           45  58  41  58  32  47 /  60  70  70  30  10 100

&&

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

&&

$$


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