Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 150301

Area Forecast Discussion
National Weather Service Salt Lake City UT
901 PM MDT Wed Mar 14 2018

.SYNOPSIS...A broad Pacific storm system will move across the
western United States in pieces through the upcoming weekend,
resulting in cool and continued unsettled conditions.


.DISCUSSION...The first piece of a broad Pacific storm system is
making its way across the forecast area this evening. Cold front
is currently near a KELY-KEVW line as it tracks eastward.
Precipitation has filled in nicely along and behind this boundary
across northern Utah and southwest Wyoming, and in higher rates
snow levels have fallen as low as the Cache Valley. The boundary
will continue to the east tonight as it weakens, so coverage of
precip should decrease significantly overnight. Winds were gusty
at times ahead of the boundary but have diminished on schedule
this evening, so going wind headlines are being allowed to expire.

Behind the initial wave, Utah and southwest Wyoming will see a
relative lull in precip into tomorrow morning before the arrival
of the second piece of the system tomorrow afternoon. The second
piece will bring a reinforcing shot of colder air and allow
precip to become more widespread once again, with perhaps a
greater extent into southern Utah. Models indicate another
relative lull behind this piece for Thursday evening through much
of Friday before the main trough tracks across the area Saturday
into Sunday, bringing another period of widespread precip with
snow possible down to most valley floors.

Updated the forecast earlier to remove headlines, lower snow
levels for parts of northern Utah and to tweak POPs slightly. No
additional updates planned.


.AVIATION...At the SLC terminal...prevailing MVFR conditions in
rain are expected to become prevailing VFR between 04Z and 06Z as
the precipitation decreases in coverage. There is a 20 percent
chance prevailing MVFR conditions will linger longer than
anticipated. Northwest winds are expected to shift to the
southeast between 07Z and 09Z, but there is a 30 percent chance of
winds remaining northwesterly throughout the night.






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