Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 121602

Area Forecast Discussion
National Weather Service Salt Lake City UT
1002 AM MDT Thu Apr 12 2018

.SYNOPSIS...A cold Pacific storm system will advance east across
the Great Basin today through Friday. High pressure will return
for the weekend. Another cold storm is expected to impact the
region early next week.


.DISCUSSION...Bad news for those who are ready for warm weather
and summer-like conditions this morning as a cold late season
winter storm bears down on the area. Much of the Wasatch Front has
changed over to snow as strong cold air advection rapidly dropped
temperatures. Accumulations have been minimal if at all so far
given the very warm surface temperatures from the series of 70
degree days this week.

A trough crossing the western United States is responsible for
the major shift in the weather. An ejecting trough will bring a
front through much of the state this morning. The main trough will
cross the area later this afternoon, reinforcing the earlier cold
front. Between these two pieces of the storm, there may be a
period where precipitation decreases in intensity, but this should
pick up again this afternoon.

Two main impacts for the day: snow and wind. Starting with wind,
going headlines are on track. Sensors in Lehi have shown wind
gusts as strong as 64 mph this morning. Upgraded Utah County`s
going wind advisory to a high wind warning for the remainder of
the day. Will likely allow high wind warnings for southwestern and
west central Utah to expire at noon and continue the remainder of

A winter storm warning continues for the Wasatch Mountains south
of I-80, with winter weather advisories continuing for the
remainder of the Utah mountains. These headlines are on track and
no adjustments are needed at this time.

Updated the forecast to change precipitation to snow faster across
the Wasatch Front, lower temperatures quicker and adjust other
portions of the forecast closer to current trends. Additional
updates are likely in a storm of this nature.

Will continue to monitor the potential for a lake effect snow band
or lake enhanced snow showers tonight into Friday morning. The
main impact would be for Salt Lake County and the Tooele Valley,
though wind speeds seem to be averaging higher than normal for a
decent lake effect event.


.AVIATION...IFR conditions in snow will continue at the SLC terminal
through at least 20Z, with LIFR conditions under the heavier bands.
After 20Z, snow may become more showery/intermittent, but periods of
IFR conditions will continue to be possible through at least 06Z.
Trace to half an inch of snow accumulation is possible on untreated
runway surfaces through 23Z today. Lighter winds as of 16Z will
likely increase again around 18-21Z, with a 50 percent chance of
gusts greater than 30 mph.


UT...Wind Advisory until 9 PM MDT this evening for UTZ019>021.

     Winter Weather Advisory until noon MDT Friday for UTZ007-009-010.

     Winter Storm Warning until noon MDT Friday for UTZ008.

     High Wind Warning until 6 AM MDT Friday for UTZ005.

     High Wind Warning until midnight MDT tonight for UTZ004.

     Winter Weather Advisory until noon MDT Friday for UTZ517-518.

     High Wind Warning until noon MDT today for UTZ015-016.

     High Wind Warning until 6 AM MDT Friday for UTZ011-012.




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