Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 080332

Area Forecast Discussion
National Weather Service Salt Lake City UT
832 PM MST Thu Dec 7 2017

.SYNOPSIS...Strong high pressure will remain in place through at
least the middle of next week.


.DISCUSSION...A high amplitude mid level ridge resides along the
Pacific Coast this evening, inducing a northerly flow downstream
across the forecast area. As this ridge has expanded eastward a
bit over the last 24 hours, mid level temperatures have warmed a
few degrees which is gradually working to strengthen valley
inversions across most of northern and central Utah. More
sheltered locations such as the Cache Valley and Uinta Basin
struggled to warm today, while many locations along the Wasatch
Front into central Utah warmed a couple of degrees over
Wednesday`s max temps. Anticipate patchy fog and/or low stratus to
once again develop in the Cache and other sheltered valley
locations again tonight, as well as perhaps near Utah Lake.

The upstream mid level ridge is forecast to expand eastward
through the weekend, which should act to further strengthen
inversions across northern and central Utah through early next
week. Beyond that, the EC, GEM and GEFS Ensemble mean all suggest
the mean ridge position retrogrades late in the week, and
although confidence is low this far out, could open the door to
waves digging south which could help scour out some valley
locations by next weekend. That said, in the interim increasing
haze and decreasing air quality with areas of fog/stratus will be
the norm through at least the middle of next week.


.AVIATION...Light southerly winds and VFR conditions are expected
to prevail at KSLC through the overnight hours, although winds
will likely become light and variable at times.





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