Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 210449
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
949 PM MST Sat Jan 20 2018

.SYNOPSIS...A Pacific storm system will exit east into western
Colorado late tonight. High pressure will briefly return on Sunday
night, followed by a weak storm grazing northern Utah on Monday.
A stronger storm is expected during the latter part of next week.

&&

.DISCUSSION...The slow-moving north-to-south upper trough moving
east across Utah should exit the forecast area by late tonight.
Near and ahead of the trough axis sufficient lift and instability
exists for light to locally moderate snow, especially over the
higher terrain and along the I-15/I-70 corridors in central Utah.
Most of this activity will winds down overnight, though lingering
snow showers along the southern I-15 corridor could still
generate minimal accumulations into early Sunday morning.

A transient upper ridge will move east across the Great Basin
Sunday night through early Monday morning. Trailing this feature a
shortwave will race east across the northern Rockies/northern
Great Basin Monday. Low-level warm advection ahead of this feature
could generate some light precip across the far north early
Monday. This precip should expand in areal coverage later in the
day as the mid-level shortwave grazes far northern Utah/southwest
Wyoming. Not anticipating any significant precip with the feature,
though a few inches of new snow are possible for the far northern
mountains and the valleys near the Idaho border.

A somewhat stronger upper ridge will settle across the region
midweek ahead of the next cold trough schedule to arrive over the
Great Basin for late Thursday/Friday. This next system should
generate another round of fairly widespread precip, especially
across the mountains and western/northern valleys of the forecast
area.

For tonight will leave the remaining winter weather highlights in
place, with their expirations planned as currently scheduled.

&&

.AVIATION...The upper level trough passing through northern Utah
will be east of the area after 08z. Linger light snow showers are
possible, with brief periods of MVFR conditions in these showers
through around 07z. A drier northerly flow aloft will maintain
north winds at the terminal and VFR conditions Sunday.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Winter Storm Warning until 5 AM MST Sunday for UTZ008>010-517-
     518.

     Winter Storm Warning until 11 PM MST this evening for UTZ006.

     Winter Weather Advisory until 11 PM MST this evening for UTZ011-
     012.

WY...Winter Storm Warning until 5 AM MST Sunday for WYZ021.

&&

$$

CONGER

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visit...
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