Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 081646 AAA

Area Forecast Discussion...UPDATED
National Weather Service Salt Lake City UT
946 AM MST Thu Dec 8 2016

.SYNOPSIS...A persistent and quite moist westerly flow aloft will
generate significant precipitation for northern Utah and southwest
Wyoming through the upcoming weekend.


.DISCUSSION...Have made some minor updates to the forecast for
this morning and this afternoon. The 700mb warm advection is
moving in across northwest Utah this morning with snow already
at Wendover. Radar showing these weak echoes moving rapidly
eastward to the west side of the Great Salt Lake. Have added PoPs
to the northern mountains this morning as the higher peaks of
central Wasatch already disappearing in light snow. Models appear
somewhat slow in this warm advection pattern in developing snow so
may have to make another update to increase PoPs for this
afternoon. The speed convergence of the upstream 700 mb winds into
the best 700 mb baroclinic zone is quite impressive with 40 kts
over northeast Nevada and only 15-20 kts over Utah. This may be
the key in pushing the onset of precip earlier and more widespread
for this afternoon from I-80 northward.

The cloud shield has spread rapidly eastward across the CWA this
morning with most reporting stations indicating a mid cloud deck.
Have boosted sky cover over eastern and southern portions of Utah
and across southwest Wyoming to mostly cloudy for the entire day.


.AVIATION...The SLC terminal will see VFR conditions through the
morning with increasing clouds. Cigs are expected to drop to or
below 6000 feet AGL by 18z-19z, with a 30% chance of MVFR
conditions developing by 20-21Z in snow. Snow accumulation of 1
inch possible on untreated surfaces between 00z and 12z Friday
with a 40 percent chance of some snow accumulation prior to 00Z.


UT...Winter Weather Advisory from 3 PM this afternoon to noon MST
     Friday for UTZ003-004-010.

     Winter Storm Warning from noon today to 4 PM MST Saturday for

     Winter Storm Warning from 3 PM this afternoon to 3 PM MST Friday
     for UTZ001-002-005-006.

WY...Winter Weather Advisory from 3 PM this afternoon to 3 PM MST
     Friday for WYZ021.




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