Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 201825

Area Forecast Discussion
National Weather Service Salt Lake City UT
1125 AM MST Sat Jan 20 2018

.SYNOPSIS...A cold and moist storm system will slowly cross Utah
today. High pressure will build briefly 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...A southwest-northeast oriented low level baroclinic
zone remains draped across the forecast area this morning, and
continues to serve as a focus for snowfall across the forecast
area. A wave riding along this boundary is helping to enhance
snowfall across southern Utah, and this feature will continue to
lift northeast into central and eventually northern Utah as the
day progresses, which will likely keep periods of snow going
through the afternoon and into the evening hours.

The parent mid level trough currently moving inland across
southern California is forecast to translate eastward and
eventually form a closed circulation as it crosses the Four
Corners region later tonight. As such precipitation will likely
become more orographic in nature during the evening and overnight
hours before tapering off Sunday morning.

Will likely be able to drop the going Winter Storm Warning for
the Salt Lake Valley shortly, as well as trim additional headlines
later on this afternoon. Otherwise will update to remove morning
wording from the going forecast as well as make additional tweaks.


.AVIATION...Occasional snow will be possible at the SLC terminal
through 20-21Z. Additional snow may redevelop between 21-02Z
tonight, which may bring IFR conditions and light accumulations on
untreated surfaces. Northwest winds will continue through the day.


UT...Winter Storm Warning until 5 AM MST Sunday for UTZ008>010-

     Winter Storm Warning until 11 PM MST this evening for UTZ003-004-

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

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




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