Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 141610
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
1010 AM MDT Wed Apr 14 2021

.SYNOPSIS...A low pressure system will bring cool and unsettled
conditions through the remainder of the week. Drier and warmer
conditions are anticipated over the weekend into early next week.

&&

.DISCUSSION...A broad upper low remains centered over Nevada this
morning, with the front edge of the system nosing into northern
Utah. The position of this system is continuing to result in an
easterly pressure gradient across northern Utah with respectable
cold advection. Downslope winds continue in prone northern Utah
locations, strongest near Weber Canyon but with several locations
still seeing gusts in excess of 40 mph. Have extended the High
Wind Warning for the northern Wasatch Front until noon with these
trends but have allowed the Wind Advisory for the Salt Lake Valley
to expire. Conditions will continue to become less favorable for
downslope winds late this morning as the trough continues east,
and anticipate allowing remaining headlines to expire on time at
noon.

With the trough tracking into the area, precipitation continues to
fill in over northern Utah and as downslope winds decrease,
precipitation is increasing for those valley locations. The
combination of lingering winds and increasing snow is resulting in
some travel difficulties for some northern Utah canyons including
Parley`s, Weber, and the Cottonwoods, but conditions should
improve as the winds decrease. Rain and snow, however, will
continue throughout the day and into Thursday as the trough slowly
moves across the area. As the mechanism for precipitation
increasingly transitions to cold pool instability should see the
focus move to the higher terrain.

The track of the trough will keep it away from southern Utah,
resulting in continued dry conditions in this part of the forecast
area. Flow aloft will also be enhanced over that area, resulting
in areas of critical fire weather conditions where fuels are dry.
Winds will be especially strong over south central and
southeastern Utah where a Wind Advisory will be in effect this
afternoon and this evening.

Temperatures will remain on the cool side today and tomorrow due
to the influence of the trough, with maxes as much as 10F below
seasonal normals anticipated. The main system is expected to exit
by Friday, but an additional wave on the back edge of the system
will bring some additional instability for Friday. Warmer and
drier conditions are then expected for the upcoming weekend.

No additional updates expected to the forecast this morning.

&&

.AVIATION...At the SLC terminal...occasionally gusty easterly
winds are expected to transition to prevailing northwesterly by
18Z. VFR conditions are expected to prevail with cigs staying at
or below 6000 feet AGL due to the presence of showers. However,
periods of MVFR conditions are likely in heavier showers through
the early afternoon.

&&

.FIRE WEATHER...A large and slow moving trough will make its way
across northern Utah through Thursday. Ahead of the system, winds
will be enhanced over southern Utah and will combine with the
continued dry conditions to produce critical fire weather
conditions. Fire danger is expected to decrease some tomorrow as
winds decrease and relative humidities increase under the
influence of the storm system. Drier conditions are then
anticipated for the weekend with winds remaining generally light.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Red Flag Warning until 9 PM MDT this evening for UTZ489-494.

     High Wind Warning until noon MDT today for UTZ103-104-107.

     Red Flag Warning until 9 PM MDT this evening for UTZ495-497-498.

     Wind Advisory until 9 PM MDT this evening for UTZ128-130-131.

     Winter Weather Advisory until midnight MDT tonight for UTZ111-
     112.

WY...Winter Weather Advisory until midnight MDT tonight for WYZ021.

&&

$$

Traphagan

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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