Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 210439

Area Forecast Discussion
National Weather Service Salt Lake City UT
939 PM MST Mon Feb 20 2017

.SYNOPSIS...A weak weather system will brush northern Utah
tonight, otherwise a mild and strong southwest flow will prevail
through Tuesday. A cold front Tuesday night will usher in a period
of cold unsettled weather through the end of the week.


.DISCUSSION...A mild and moist southwest flow remains in place over
the forecast area this evening ahead of a trough over the West
Coast. The pressure gradient continues to tighten across Utah while
700mb winds of 45-55kt are forecast overnight. Gusty south winds
have already been realized across the western valleys of Utah and
expect these to continue and even strengthen in some areas tonight
into tomorrow.

Warm advection occurring at 700mb is helping to keep some
precipitation in place across northern Utah, which is being enhanced
by weak ripples making their way through southeast Idaho.
Precipitation is expected to decrease somewhat as the pattern
amplifies, taking these waves farther north. With the airmass
warming, snow levels will mostly remain above 7500ft. Otherwise,
cloud cover across northern Utah along with some low stratus across
southern Utah will combine with the winds and mild airmass to keep
overnight mins on the warm side tonight.

A shift to a much cooler pattern will begin tomorrow night as the
trough over the West Coast pushes a cold front into northern Utah.
This cold front will slowly cross Utah through Wednesday night with
a potential for snow to the valley floors through Thursday.

No updates this evening.


.AVIATION...Gusty south winds will continue at the SLC terminal
through the overnight hours and into Tuesday. Any precipitation
will likely hold off until Tuesday evening.


UT...Wind Advisory until 9 PM MST Tuesday for UTZ003-005-015-016.

     Winter Weather Advisory from 2 PM Tuesday to 11 AM MST Wednesday
     for UTZ007>009.




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