Area Forecast Discussion
Issued by NWS Salt Lake City, UT
FXUS65 KSLC 271730
Area Forecast Discussion
National Weather Service Salt Lake City UT
1030 AM MST Sun Nov 27 2016
.SYNOPSIS...A series of increasingly cold Pacific storm systems
will continue to cross the area through Tuesday morning.
.DISCUSSION...A longwave trough encompasses the western US this
morning, with a series of shortwave features rotating through the
mean flow. The next wave to impact the forecast area is currently
digging through the southern Great Basin, and is forecast to
continue on a southeastward trajectory through the Desert
Southwest through tonight. Although the best forcing associated
with this wave will pass south of the forecast area, the
associated mid level trough will cross northern Utah this
afternoon and evening bringing an increase in showers, as well as
orographically enhanced snowfall within a moist and modestly
unstable WNW flow. Cold advection should lower snow levels to the
valley floors along the Wasatch Front and I-15 corridor by late
afternoon, however any valley accumulation is expected to remain
minor. This wave is forecast to move east of the area by late
evening bringing a temporary break in precipitation.
The next upstream wave, currently located along the British
Columbia coastline, is forecast to quickly dig southeast through
the Great Basin during the day Monday. Warm advection ahead of
this wave should result in snow developing across areas north of
I-80 during the pre-dawn hours, with snow quickly filling in
across northern Utah, and southward along the I-15 corridor,
around sunrise as the surface cold front pushes across the area.
Strong forcing associated with the passing wave coupled with moist
and increasingly unstable northwest flow all point to significant
snow accumulations along the terrain adjacent to the I-15
corridor, as well as along the Wasatch Front. Snow totals will
likely be enhanced downwind of the Great Salt Lake as the
environment looks favorable for lake effect snowfall Monday night
into Tuesday morning. Further south, snow is expected along the
I-15 corridor of central and southwest Utah Monday afternoon,
however a shorter duration of snowfall will limit amounts in these
areas. Additionally, winds will be gusty and potentially strong in
the wake of the cold front across northwest Utah during the day.
Going forecast for today looks in good shape, and will update to
remove morning wording later on.
.AVIATION...Southerly winds at the SLC terminal are expected to
shift to the northwest between 19-21Z. Expect ceilings to remain
near 5000-6000 feet throughout the day with occasional reductions to
MVFR this afternoon in rain/snow showers.
UT...Winter Storm Warning until 5 AM MST Tuesday for UTZ007>010-517-
Winter Storm Watch from late tonight through Monday evening for
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