Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 221530

Area Forecast Discussion
National Weather Service Salt Lake City UT
930 AM MDT Thu Mar 22 2018

.SYNOPSIS...An increasingly moist southwest flow aloft will spread
northeast across much of Utah through tonight. A weak disturbance
embedded in this moist southwest flow will cross Utah tonight
through early Friday. A second cold upper level trough off the
Pacific Northwest coast will move east and impact mainly northern
and western Utah and southwest Wyoming this weekend.


.DISCUSSION...Southwesterly flow prevails across the Interior
West this morning. The remnants of an embedded Atmospheric River
(AR) within this flow continue to slowly spread eastward across
the Great Basin, with associated moisture advection coupled with
orographic forcing allowing for periods of rain and high
elevation snow (above 9500 feet) across both northern and
southwest Utah. As large scale ascent increases this afternoon
through this evening in response to an approaching shortwave
trough, should see precipitation expand in coverage and intensity
across much of the forecast area.

Strengthening flow aloft coupled with a tightening pressure
gradient today should also allow winds across western Utah as
well as the higher terrain to increase. Gusts into the 40 mph
range have already been observed across the Dugway Mesonet and
will likely continue to increase into the afternoon hours. Going
High Wind Warning for the western valleys still looks on track.

The cold front associated with the approaching shortwave is
forecast to push into northern Utah after midnight serving as a
focus for heavy precipitation, and lowering the snow levels below
7000 feet. This front will quickly sweep out of the area Friday
morning allowing for a quick drying trend by afternoon. May need
to consider Winter Weather Headlines for the northern mountains
for tonight given heavy snow potential.


.AVIATION...Gusty winds will continue to increase at the SLC
terminal through the morning. By afternoon, wind gusts in excess
of 40kts are possible. Ceilings are expected to fall to near 7000
feet after 17-18Z.


UT...High Wind Warning until 9 PM MDT this evening for UTZ003-005-015-




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