Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 150435

Area Forecast Discussion
National Weather Service Salt Lake City UT
935 PM MST Thu Dec 14 2017

.SYNOPSIS...High pressure will build into the area through Friday.
A Pacific system will cross the area Saturday. High pressure will
build into the area once again Sunday into Tuesday with another
storm expected Wednesday.


.DISCUSSION...Current large-scale pattern depicts a ridge building
back into the western CONUS this evening while thin high clouds
start to spread into northern Utah. With 700mb temperatures
continuing to gradually warm, inversions will strengthen for
tomorrow. For the rest of the night, though, expect some reductions
in visibility due to lingering haze. The 00z SLC sounding does show
that the lower levels have dried even more from 24 hours ago.
Although the threat of fog will still exist across portions of
northern Utah tonight, the potential is not particularly great, so
any fog that does manage to develop will be patchy and will develop
late in the night or early tomorrow morning.

The next storm system is still on track to cross the area on
Saturday. This storm is expected to bring 700mb temperatures down to
-12C across northern Utah, which should be sufficient to turn the
airmass over. Otherwise, some generally light snow is also expected
to accompany this storm across northern and portions of central

Updated the forecast earlier this evening to reduce sky cover for
the rest of the night. No additional updates expected.


.AVIATION...Southeasterly drainage winds are expected to prevail at
the SLC terminal through the night. There is a 60 percent chance
that visibilities will drop to MVFR levels overnight but only a 10
percent chance that visibilities or ceilings drop to IFR levels or
below through Friday morning.





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