Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 101654

Area Forecast Discussion
National Weather Service Salt Lake City UT
954 AM MST Sun Dec 10 2017

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


.DISCUSSION...Little change expected with the pattern across the
western states through midweek as the strong and persistent upper
ridge remains locked in over the region. Anticipating some
retrogression of the mean ridge position during the latter half of
the week. A series of shortwaves moving out of the central/eastern
Pacific will crest this retreating ridge and then phase with the
deep/cold eastern CONUS upper trough as they races through the
northern Rockies.

As the ridge works back into the eastern Pacific, the mid-level
flow will increase from the north beginning late Wednesday. The
first shortwave embedded in this flow will graze northern/eastern
Utah Wednesday night. This feature will not offer up precip for
Utah, and probably have minimal impact on the haze/fog as very
little surface-700mb reflection is seen with this feature.

The chances of turning over the valley inversions will increase
with the next shortwave scheduled to cross the northern Rockies
and northern Great Basin Friday night/early Saturday. This second
features does not look to be a big precip producer, but it will
bring a definable surface front through the state along with
substantially colder air in and around 700mb to help break up the
valley inversions.

In the short term, valley fog/low clouds will remain in the Cache
valley and in and around Bear Lake the next couple of days. Saw
low clouds also develop over the GSL and drift off to the
southwest late last night/early this morning. Suspect that these
low clouds will gradually expand in areal coverage out into
central Tooele county and the Salt Flats the next couple of days.

No updates planned for the previous forecast at this time.


.AVIATION...The SLC terminal will see VFR conditions and clear skies
throughout the day. Urban haze will continue, but visibilities
should remain at or above 6SM through the daytime hours. Light
southeast winds are expected to shift to the northwest by 18Z.





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