Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 171716

Area Forecast Discussion
National Weather Service Salt Lake City UT
1016 AM MST Tue Jan 17 2017

.SYNOPSIS...High pressure aloft will settle over the Great Basin
for the first half of the week. A series of weakening weather
disturbances will cross the region beginning late in the week.


.DISCUSSION...The axis of the upper ridge extending from the
eastern Pacific through the northern Rockies will roll over into
Utah for Tonight/Wednesday.

Stable conditions due to strong valley inversions will continue
into Wednesday, and possibly into Thursday morning. Areas already
experiencing valley fog/stratus and urban haze will likely see
little improvement, and could even see a modest expansion tonight
through Wednesday morning.

The upper ridge over the region will eventually yield to a series
of splitting eastern Pacific upper troughs beginning late in the
week. Thermal advection and dynamic support for lift look to be
weak due to the split, though with sufficient moisture would
expect would expect widespread but generally light precip on
Thursday through early Friday. The trailing second disturbance
looks to focus much of the energy over southern Utah as the upper
jet takes aim on southern Arizona for the first half of the weekend.

Will issue an update to adjust cloud cover. Remainder of the short
term forecast looks to be in good shape.


.AVIATION...VFR conditions will prevail at the SLC terminal
through about 04-05z. There is a 40 percent chance that the visby
will remain 6SM or fall into high end MVFR through 04Z. Light and
variable winds are expected to become light northwest after 18Z and
then switch back to southeast after 04-05Z tonight.





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