Weather Service Report


761 
FXUS66 KOTX 230436
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
936 PM PDT Wed Sep 22 2021

.SYNOPSIS...
Warm and dry fall weather will return on Thursday and is expected
to last through Sunday. Afternoon temperatures in the 70s will be
common through the weekend. Chances for precipitation will
increase early next week with the most significant rain likely
occurring over the mountainous terrain.

&&

.DISCUSSION...

Tonight: Several hours of gusty west winds are expected this
evening in the lee of the Cascades as a weak frontal system 
crosses eastern Washington and north Idaho. The most notable wind 
gusts will occur in central Washington in spots prone to gap winds
east of the Cascades. Places like Wenatchee, Ellensburg, Vantage,
Entiat, and Waterville can expect gusts of 25 to 30 mph out of 
the west. Further east, evening winds do not look particularly 
impressive as the front shears apart. Without much cold advection 
or momentum aloft places like Pullman, Lewiston, and Spokane may 
not get many gusts over 15 to 20 mph this evening. Overnight lows
aren't expected to be particularly cool with most locations 
dipping into the 40s. Yeah, this front isn't impressive.

Thursday and Friday: Dry, seasonably warm, and mainly clear 
weather will return for Thursday and Friday. An upper level high
pressure ridge over the eastern Pacific will migrate inland
Thursday and remain our predominant weather feature through the
weekend. Afternoon temperatures on Thursday will climb into the
low to mid 70s. Friday should be about 5 degrees warmer with mid
to upper 70s common and a few spots like Lewiston, Omak,
Wenatchee, and Grand Coulee flirting with 80. /GKoch

Saturday through Wednesday: The high pressure that has been over the 
region is expected to breakdown as a Low pressure system in the Gulf 
of Alaska begins to press into the region. Saturday is expected to
be seasonably dry, warm day. The model agreement is good for the 
position and timing of the Low. It is poor on the impacts. The GFS
is keeping it to a mainly West side precip event with some spill 
over the Cascades. The ECMWF is spreading the precip into the 
Idaho Panhandle. The difference keeps confidence in amounts low. 

The region can expect to be on a cooling trend with the system. 
Depending on timing of precip, the Northern Cascades could receive a 
decent dusting of snow around Tuesday morning. The rest of the 
region can expect periods of rain Sunday through Wednesday. 
Afternoons are expected to have winds increase across the Basin with 
gusts into the low 20s MPH. Highs will be start in the 70s and 80s 
on Saturday and drop into the 60s by Monday. Lows will start in the 
40s and 50s and drop into the 30s and 40s. /JDC

&&

.AVIATION...
06Z TAFS: Thin cirrus will stream over the ridge building into the
region. VFR conditions expected. Winds will be light except for
KEAT where gap winds will continue for the next few hours. 

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        45  72  46  77  50  79 /   0   0   0   0   0   0 
Coeur d'Alene  46  70  45  76  50  78 /   0   0   0   0   0   0 
Pullman        42  69  42  76  48  78 /   0   0   0   0   0   0 
Lewiston       53  76  51  82  55  85 /   0   0   0   0   0   0 
Colville       38  74  38  77  43  80 /   0   0   0   0   0   0 
Sandpoint      41  67  41  71  45  76 /   0   0   0   0   0   0 
Kellogg        47  68  48  75  54  78 /  10   0   0   0   0   0 
Moses Lake     43  74  46  78  49  82 /   0   0   0   0   0   0 
Wenatchee      51  76  55  78  57  81 /   0   0   0   0   0   0 
Omak           46  77  49  80  52  82 /   0   0   0   0   0   0 

&&

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

&&

$$

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Western Regional Climate Center, wrcc@dri.edu