Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 150432

Area Forecast Discussion
National Weather Service Salt Lake City UT
932 PM MST Sat Jan 14 2017

.SYNOPSIS...An upper level low pressure system passing to the
south this weekend will continue to spread moisture northward
into southern Utah. High pressure aloft will settle over the Great
Basin for the first half of the week, followed by a return to an
active weather pattern late in the week.


.DISCUSSION...A closed low continues to spin near central Baja
this evening with moisture streaming north into sern UT along with
a little light precip. A light flow regime covers most of the CWA
and stratus remains extensive across the valleys from Cedar City
north to SLC and across the Uinta Basin. Fog covered portions of
the Sanpete valley and was reported to be dense in the Bear River
valley near Randolph and east across much of Uinta Co WY.

The closed low moves slowly east, south of the border and into
west Texas by late Sun continuing to spread moisture north into
sern UT thru that time. Areas of light precip will continue but
any snow accumulation should stay minor and mostly above 7000 ft.
The stratus is also expected to persist thru Sun but an increasing
northerly flow aloft could disrupt it Sun night into Mon as the
upstream ridge builds in from the west. Expect the fog across the
north to remain in place into Sun morning then at least partially
burn off. Local fog is also possible in the Cache and Heber
valleys tonight into Sun morning.

Valley inversions will tighten somewhat heading into mid week as
the upstream ridge moves inland and the airmass aloft warms.
Expect increasing urban haze and and increasing threat of fog
across more nrn valley locations.

The next trof for Thu is looking less robust for the eastern
Great Basin as it will be rapidly weakening as its being overtaken
by a stronger upstream system. This next wave looks to keep the
weather across the CWA unsettled thru the weekend.

Updated earlier to add mention of fog to the areas where it had
developed and adjusted sky cover downward a bit across the nwrn
CWA. No additional updates planned.


.AVIATION...MVFR CIGS are expected to prevail at the SLC terminal
through the night and into the midday hours Sunday. VSBYs will
occasionally dip into the MVFR range after about 05-06z and there
is a 20 percent chance of periodic IFR VSBYS between 08-18Z.
Winds will be light northerly through the period.






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