Area Forecast Discussion
Issued by NWS Spokane, WA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS66 KOTX 210421
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
821 PM PST Fri Jan 20 2017

.SYNOPSIS...
Periods of light snow are expected today and into the weekend for
the East Slopes of the Cascades. For the remainder of the Inland
Northwest the best opportunity of accumulating snow will be on
Sunday. A drier and cooler weather pattern is expected next week
with the possibility of deteriorating air quality as the week
wears on.


&&

.DISCUSSION...
Evening update: A warm occluded boundary is limping northward
into the region with light to very light precipitation falling
across Central WA and into SE WA. The main threat for very light
snow accumulations will remain in Central WA with light
accumulations mainly tied to elevations of 2000 feet and higher.
This will lower some as the night progresses but at this
time...most valleys along Hwy 97 into the Columbia Basin are
running in the mid 30s. We have observed a wintry mix at times at
the Wenatchee AP and expect this is the case for other locations
as well so added sleet to snow/rain.

00z NAM and 12z EC suggest no measurable pcpn for Ern WA and N ID
but 00z GFS is still holding on to a potential for 0.01-0.02"
Precip type will be challenging if this comes to fruition with
evening balloon data showing temps above freezing 2600 ft AGL.
If we see any precip, it will be very light neglecting wetbulb
cooling and could fall as a light wintry mix briefly but general
confidence is lower tonight with thicker cloud deck in place and
less chance for temperatures to cool below freezing. Overall, this
will be a very light pcpn event region-wide with minimal impacts.
/sb


&&

.AVIATION...
00Z TAFS: An upper level trough off the Pacific coast will send a
shearing deformation moisture band through the region from
southwest to northeast tonight and Saturday morning bringing a 4
to 6 hour period of light snow to most TAF sites. Ceilings and Vis
during this weak storm system will be generally MVFR over the
eastern TAF sites late tonight and early Saturday and and low
MVFR or IFR over the KMWH and KEAT TAF sites mainly tonight. In
the wake of this system IFR conditions under low stratus may
persist at KEAT and KMWH through much of Saturday. /MJF



&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        31  34  26  34  24  32 /  20  50  20  70  90  20
Coeur d`Alene  30  35  25  34  24  34 /  10  50  20  60  90  20
Pullman        32  35  28  35  25  31 /  20  40  20  70  60  20
Lewiston       34  38  30  38  28  35 /  10  40  20  60  30  20
Colville       29  33  28  34  25  32 /  10  60  50  40  90  20
Sandpoint      31  33  27  34  27  33 /  10  60  40  40  90  20
Kellogg        28  33  25  33  25  31 /  10  50  30  50  90  20
Moses Lake     30  34  25  34  22  32 /  40  30  20  90  20  10
Wenatchee      31  33  26  32  25  29 /  80  40  50  90  20  10
Omak           33  34  26  33  25  31 /  60  70  70  90  80  20

&&

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

$$



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.