Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 201615
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
1015 AM MDT Thu Apr 20 2017

.SYNOPSIS...A cold front will cross the region today with a cold
northwest flow continuing into Friday. An upper level ridge will
build into the region this weekend, bringing a warming trend to
entire state.

&&

.DISCUSSION...Negative-tilt upper trough entering the western
Great Basin this morning will continue east into and then across
Utah later this afternoon/this evening. The associated surface
cold front currently to the west of the urban corridor has
generated weak convective showers in advance of the front, with a
solid line of showers along the frontal boundary. The strongest
convection exist across far northern Utah where the low-level cold
advection continues to strengthen. No thunderstorm activity is
noted yet, but if it does develop late this morning/early this
afternoon it will likely be along the northern portion of the
cold front.

Anticipating an increase in intensity and areal coverage of precip
this afternoon/evening as the trough advances east into and across
the forecast area. Deepening cold advection, increasing
dynamically generated lift and strong upper divergence will create
a broad area of synoptic-scale lift across the northern half of
the forecast area.

Colder low-level air behind the surface front will filter into
southern Utah later today. Not looking for anything more than
isolated convection along the frontal boundary as the best mid and
upper level support for lift remain to the north of the area.

High pressure aloft building in behind the exiting negative-tilt
upper trough will bring a significantly drier, warmer and more
stable air mass to the state for late Friday through the upcoming
weekend.

&&

.AVIATION...West winds will continue at the SLC terminal ahead of
the main front. This front will arrive between 17-18Z and reinforce
the winds. A period of moderate rain is expected tonight through
about 03Z bringing the threat of MVFR or even high end IFR
conditions.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Wind Advisory from 9 PM this evening to 11 AM MDT Friday for
     UTZ012-013.

WY...None.
&&

$$

PUBLIC...CONGER
AVIATION...KRUSE

For more information from NOAA`s National Weather Service visit...
http://weather.gov/saltlakecity

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



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