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 260557
AFDOTX

Area Forecast Discussion
National Weather Service Spokane WA
957 PM PST Sat Feb 25 2017

.SYNOPSIS...
Snow will return to the Inland Northwest tonight, Sunday, and
Monday. A prolonged period of snow showers will have the potential
to produce significant accumulations for the Idaho Panhandle and
portions of southeast and east central Washington. Chilly
temperatures will linger through Tuesday. A windy and milder weather
pattern will be possible Wednesday through Saturday.


&&

.DISCUSSION...
Evening update: Radar is filling in across the region with light
snow already showing up on cams in the northern mountains and
north Idaho Panhandle. Evening guidance did not deviate far from
earlier runs...with the main changes being a few hundreths drier
in the north for tonight. Still some uncertainty exactly where the
boundary sets up Sunday afternoon with the NAM/previous EC still a
bit further north than the GFS yet all guidance generally agrees
that the rising terrain of the Palouse into the Central Panhandle
Mtns will receive the best potential for moderate snow amounts
through Sunday afternoon. This is based on persistent
upslope/isentropic ascent. Further north into NE WA and N ID...the
atmosphere will be destabilizing as 500mb temps cool and 850-700mb
remain status quo. This could lead to convective banding and
potential for moderate to heavy snow accumulations over very short
distances and is tough to identify where this will setup until
they form. Otherwise, no significant changes to the inherited
forecast. /sb

&&

.AVIATION...
06Z TAFs: Snow is filling in across the region and will impact all
terminals through the taf period. Periods of moderate snow will be
possible at Spokane, Coeur D Alene, and Pullman which could
deliver visibilities near 1/2sm at times. 1 to 3 inches will be
possible at these terminals. For KEAT/KMWH up to an inch is
expected through 18z Sunday...while at KLWS marginal temperatures
for accumulating snow may result in only a dusting. Impacts at the
terminals may be low late morning through afternoon given the late
Feb sun angle and potential for effective melting on blacktop but
refreezing is expected once again after dark with snow continuing
at the eastern terminals and winding down in the lee of the
Cascades. /sb

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        28  33  24  33  20  33 /  90 100  60  60  30  10
Coeur d`Alene  28  33  23  34  17  34 / 100 100  70  70  30  20
Pullman        28  34  24  35  23  35 /  80 100  60  70  80  60
Lewiston       29  37  27  40  28  41 /  30  90  60  60  70  60
Colville       28  34  18  34  18  35 /  50  80  60  30  10  10
Sandpoint      28  32  23  33  18  33 /  90  90  70  60  40  20
Kellogg        25  31  25  32  21  33 / 100 100  80  80  80  60
Moses Lake     30  38  23  38  21  40 /  50  90  60  20  20  10
Wenatchee      27  37  24  36  22  38 /  30  80  40  20  20  10
Omak           27  35  20  35  19  35 /  50  70  30  20  10  10

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...Winter Weather Advisory until 3 PM PST Monday for Northern
     Panhandle.

     Winter Weather Advisory until 10 AM PST Tuesday for Central
     Panhandle Mountains-Idaho Palouse.

     Winter Weather Advisory from 4 AM Sunday to 10 AM PST Tuesday
     for Lewis and Southern Nez Perce Counties.

     Winter Weather Advisory from 4 AM to 3 PM PST Sunday for
     Lewiston Area.

     Winter Weather Advisory until 3 PM PST Monday for Coeur d`Alene
     Area.

WA...Winter Weather Advisory until 3 PM PST Monday for Northeast
     Mountains.

     Winter Weather Advisory until 10 AM PST Tuesday for Washington
     Palouse.

     Winter Weather Advisory from 4 AM Sunday to 10 AM PST Tuesday
     for Northeast Blue Mountains.

     Winter Weather Advisory from 4 AM to 3 PM PST Sunday for Lower
     Garfield and Asotin Counties.

     Winter Weather Advisory until 3 PM PST Monday for Spokane Area.

     Winter Weather Advisory until 3 PM PST Sunday for Okanogan
     Highlands.

     Winter Weather Advisory until 3 PM PST Sunday for Upper Columbia
     Basin.

&&

$$


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