Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 240445

Area Forecast Discussion
National Weather Service Salt Lake City UT
945 PM MST Fri Feb 23 2018

.SYNOPSIS...An active cold weather pattern will prevail through
at least the middle of next week as a series of weather systems move
through the region. The next storm system will cross the
area Saturday afternoon through Saturday night.


.DISCUSSION...The most recent trough is on its way out of the area
this evening with skies rapidly clearing out except for some lower
clouds near and banked up against the mountains. Brief fog was
reported at a few sites, and would not be surprised if patchy fog
develops again later tonight in normally prone valleys such as the
Cache Valley, Heber Valley, and portions of west-central Utah given
the recent snowfall and clearing skies. However, dewpoint
depressions remain large enough that it is not a major concern.
Temperatures will be colder than it was last night for most areas,
due to both the colder airmass now in place and less cloud cover in

Regarding cloud cover, this should increase tonight, especially
across northern Utah as warm advection starts to strengthen over the
area. Snow may begin to develop near the Idaho border by mid-
morning, then increase during the afternoon hours while spreading
southward as the next trough approaches the area. Still looking at a
fast-moving system that will exit the area by around mid-morning
Sunday, although many areas should only see a few hours of snow.
However, a moist northwest flow and steep lapse rates late tomorrow
night into Sunday morning will favor orographic enhancement for
northwest-facing slopes and adjacent valleys. Because snow densities
will be low, accumulations could end up being significant
particularly in these upslope regions. Winter Weather Advisories
have been hoisted for all mountain zones, the Wasatch Mountain
Valleys, Cache Valley, and valleys along the I-15 corridor except


.AVIATION...The SLC terminal will trend towards clearing out of the
lower clouds through late tonight. That being said, periods of MVFR
conditions will remain possible through 07z. Light southwesterly
winds will become more southeasterly by 09z.


UT...Winter Weather Advisory from 4 PM Saturday to 11 AM MST Sunday
     for UTZ003-004-008>010-517.

     Winter Weather Advisory from 10 AM Saturday to 11 AM MST Sunday
     for UTZ001-002-006-007.

     Winter Weather Advisory from 4 PM Saturday to 6 AM MST Sunday
     for UTZ015-016-518.




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