Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 121835

Area Forecast Discussion
National Weather Service Salt Lake City UT
1135 AM MST Thu Jan 12 2017

.SYNOPSIS...A low pressure system moving south along the west
coast will bring one final round of precipitation to much of Utah
today and tomorrow. High pressure aloft will then settle over the
region for latter half of the weekend. The next stormy period
looks to be towards the middle of next week.


.DISCUSSION...Warm advection/isentropic ascent downstream from an
upper low situated along the California coast continues to fuel
snow across much of northern and central Utah this morning, while
further south where the airmass is a bit more mild and unstable
rain is the predominant precipitation type below roughly 6000
feet. Although snow is generally accumulating on grassy and
elevated surfaces as well as side streets across the Salt Lake
Valley, main thoroughfares remain largely wet, and given fairly
minimal impact do not plan to expand going Winter Weather Advisory
beyond areas already covered. Did update to increase POPs across
northern Utah from I-80 southward into the categorical range.

As the upstream low drifts southward today through tonight, large
scale forcing will weaken across northern Utah and become focused
on the south. As such anticipate snowfall to diminish during the
late afternoon/early evening hours as precipitation becomes
focused further south overnight, then winding down across the
south Friday morning.


.AVIATION...IFR conditions are expected to remain in place at
the KSLC terminal through 21-23z today due to light snow. Conditions
are expected to improve to VFR conditions for the remainder of the
TAF period thereafter. Light west to northwest winds are expected to
persist through 03/04z before returning to a light southeast for the
overnight hours.


UT...Winter Storm Warning until 11 PM MST this evening for UTZ006>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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