Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 130345

Area Forecast Discussion
National Weather Service Salt Lake City UT
845 PM MST Thu Jan 12 2017

.SYNOPSIS...A low pressure system moving south along the
California coast will continue to spread moisture into the region
through Friday night. A drying trend will follow for early next
week before an active pattern redevelops by the middle of the week.


.DISCUSSION...The upper low currently positioned along the central
California coast will continue south along the coast through late
Friday night. This low will finally turn east into northern Baja
early Saturday, then track east across northern Mexico during the

A broad area of precip exist ahead of the upper low extending from
central/southern California northwest into the southwest portion
of Utah. This precip in Utah is largely driven by the combination
of warm advection and dynamic lift, terrain upglide and upper
divergence in the east and northeast flank of the upper low. Areas
of central and northeast Utah have seen a general decrease in
precip this evening. These area should ramp up again later tonight
as dynamic/thermally-driven lift increases a bit and upper
divergence strengthens across central through east-central Utah.

Up north a weakening low-level convergence zone did generate a
loosely organized band of light snow north of the SLC area this
evening. The remnant of this convergence zone will slip just north
of the border later tonight, leaving a few lingering showers for
the balance of the overnight hours.

Will likely extend the winter storm warning for the Wasatch
Plateau/Book Cliffs into Friday morning to match the surrounding
valley zones. The remaining mountain zones will see additional
snow, though additional accumulations are expected to be of the
light side.

Precip will linger across the far south along the far northern
flank of the upper low over northwest Mexico Saturday. The
remainder of the area will begin a drying trend as strengthening
high pressure aloft over the eastern Pacific rolls over into the
west coast states and brings a stable northerly flow to the Great


.AVIATION...The stratus deck positioned over the terminal area will
hover between 1000 and 1500 feet through around 06Z-07Z.
Visibilities could also drop into the 3-5 mile range in fog and
light snow through 07Z. Ceilings/vsbys will gradually climb back
into the VFR range after 07Z, with ceiling still running between 5
and 7 kft into early Friday morning.


UT...Winter Storm Warning until 11 PM MST this evening for UTZ007>010.

     Winter Weather Advisory until 11 PM MST this evening for UTZ004.

     Winter Weather Advisory until 11 AM MST Friday for UTZ011-012-




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