Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 180357

Area Forecast Discussion
National Weather Service Salt Lake City UT
957 PM MDT Sat Mar 17 2018

.SYNOPSIS...A slow-moving storm system will bring cool and
unsettled weather for remainder of the weekend. High pressure
aloft will return for the first half of next week and bring a
warming trend to the region, before another storm system
approaches for the latter half of the week.


.DISCUSSION...An upstream trough continues to make its way across
the southwestern CONUS this evening. Meanwhile, an existing surface
cold front and 700mb baroclinic zone remains draped across southwest
through northeast Utah. With the approach of the aforementioned
trough, the baroclinic zone is expected to strengthen through the
night, causing precipitation to increase along it. Already seeing
cooling cloud tops and increasing precipitation across southwest
Utah as the right entrance region of the upper jet and vorticity
advection coincides with the baroclinic zone.

Precipitation will diminish across northwest Utah overnight, and
showers developing near the Wasatch Front may be the last gasp for
the valleys from SLC northward. However, areas from the Uinta
Mountains and Uinta Basin through southern Utah County, the central
and southern mountains and adjacent I-15 corridor should see the
greatest precipitation amounts overnight. The east-central and
southeastern valleys will see precipitation increase late tonight,
continuing through tomorrow morning as the boundary gradually
crosses the area. Snow levels will fall to near 4000 feet across the
southwestern valleys by late tonight, and across the southeastern
valleys tomorrow morning.

Updated the forecast earlier this evening to remove thunder and to
tweak PoPs. No further updates expected at this time, but will
likely allow the advisory for UTZ008 to expire as scheduled.


.AVIATION...Light southeast winds at the SLC terminal will
likely persist through the night, and may become light and variable
at times or briefly northwest through 07z with nearby precipitation.
A 30 percent chance of brief IFR or MVFR conditions in snow is
expected, mostly before 07z. Any snow will likely produce less than
a half inch of accumulation through the night.


UT...Winter Weather Advisory until noon MDT Sunday for UTZ009>011-
517-     518.

     Winter Weather Advisory until midnight MDT tonight for UTZ008.

     Winter Weather Advisory from 3 AM to noon MDT Sunday for UTZ013.

     Winter Weather Advisory until 10 AM MDT Sunday for UTZ016.

WY...Winter Weather Advisory until noon MDT Sunday for WYZ021.




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