Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 100247
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
747 PM MST Sat Dec 9 2017

.SYNOPSIS...Strong high pressure aloft will remain the dominant
weather feature across the western states through at least the
middle of next week.

&&

.DISCUSSION...The strong mid level high remains centered over the
western Great Basin this evening with a dry and mild light
northerly flow aloft. Valley inversions also remain well
established across the north with the coldest air trapped in the
Cache and Bear Lake valleys and out near Wendover. Fog never
dissipated from the Cache Valley today and urban haze continued to
increase along the Wasatch Front. Southern valleys and higher
elevations warmed up today with Bryce Canyon airport reporting a
high of 55.

Little change in this pattern is expected thru at least the first
half of next week with fog and stratus likely now persisting thru
the day in the Cache and Bear Lake valleys. The fog and stratus
could start to form near the Great Salt Lake over the next couple
of days and could start to expend across the Salt Flats and into
the Wasatch Front.

Latest GFS still was indicating a slight cooling aloft and a
little increase in the northerly flow on Wed night into Thu but
this is not expected to have much impact on the inversions. In
addition, the system for next weekend was looking weaker and more
split in this same run, but confidence in the guidance that far
out remains very low.

Updated earlier to reduce sky cover west of the Great Salt Lake
for the rest of tonight as do not expect any fog and stratus to
develop there tonight. No additional updates planned.

&&

.AVIATION...The SLC terminal will see clear skies through the
night. Urban haze will continue, and visibilities will
occasionally drop into MVFR through the evening until the
southeast winds develop. Light and variable winds are expected to
become southeasterly between 03Z and 05Z.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...None.
WY...None.
&&

$$

Wilensky

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