Scientific Forecaster Discussion
fxus65 kslc 111532
Area forecast discussion
National Weather Service Salt Lake City Utah
832 am MST Mon Dec 11 2017
Synopsis...strong and persistent high pressure aloft will remain
the dominant weather feature across the western states through at
least the middle of this week.
Discussion...strong ridging remains the dominant weather feature
over the forecast area this morning. This is resulting in dry and
mild weather for most locations but is also strengthening valley
inversions over northern and central Utah. Fog and stratus
continue to impact the Cache Valley and Bear Lake areas as they
have for the past few days, and areas of dense fog have also
developed across portions of the Wasatch front, primarily in Salt
Lake and Davis counties. Expecting some improvement in
visibilities by late morning, but some areas like Logan will
remain in fog throughout the day. This will continue to result in
some travel difficulties.
High pressure is expected to persist through the work week,
resulting in continued inversions and associated cold temperatures
and fog/haze. The ridge will shift west some by midweek, and weak
storm systems moving over the top of it will enhance the mid and
upper level flow over Utah and southwest Wyoming somewhat, but
this should have limited impact at best on the inversions. There
will be some cooling from the very mild temperatures outside the
No updates expected to the forecast this morning.
Aviation...at the slc terminal, dense fog is expected to persist
through at least 16-17z, before likely improving to visibilities 1
mile or above around 17-19z. Exact timing is low confidence, but in
general MVFR visibilities are expected after 19z, with IFR
conditions or below likely returning after 02z.
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