Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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249
FXUS65 KSLC 230514
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
1014 PM MST Wed Feb 22 2017

.SYNOPSIS...A cold front over Utah will exit the area tonight.
Behind it, a cold, moist and unstable northwest flow will settle in
through Friday.

&&

.DISCUSSION...A cold front currently extends from east-central
through south-central Utah this evening and will continue to shift
east out of the forecast area overnight as a trough crosses the
eastern Great Basin. A band of precipitation continues along this
boundary, producing snow down to at least 4000ft. Greatest impacts
from snow through late tonight will occur along the spine of Utah,
the I-15 corridor, and southwest Wyoming.

A closed low embedded within the trough is currently centered near
the northwest corner of Utah. A dry slot is rotating around the
circulation center into northwest Utah currently. As the closed low
slowly shifts east overnight, this dry slot is expected to shift
over the Wasatch Front which should bring a corresponding downward
trend in precipitation overnight.

Precipitation should pretty much wind down across the south by
morning as the cold front exits the area. However, the opposite will
be true for northern Utah, as moisture wrapping around the low will
cause snow to increase again tomorrow morning. A cold and moist
northwesterly flow aloft will then keep unsettled weather in place
through Friday.

&&

.AVIATION...Periods of MVFR to high-end IFR conditions in snow
showers remain possible through 07z, then just a 20 percent chance
of occurrence for the remainder of the night. Starting between 13
and 15Z, IFR conditions in snow will become more likely again and
will continue until about 18Z. Winds are expected to remain out of
the north/northwest much of the night, but there is a 30 percent
chance they could turn more westerly or even southwesterly after 09-
10z.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Winter Weather Advisory until 4 AM MST Friday for UTZ007>010-
517.

     Winter Weather Advisory until noon MST Thursday for UTZ001>004-
     006.

     Winter Weather Advisory until 4 AM MST Thursday for UTZ014>016-
     518.

WY...Winter Weather Advisory until noon MST Thursday for WYZ021.

&&

$$

Cheng

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For frequently asked questions about the Area Forecast Discussion
visit...
http://weather.gov/saltlakecity/general/afd_faqs.php



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