Area Forecast Discussion
Issued by NWS Salt Lake City, UT
FXUS65 KSLC 220512
Area Forecast Discussion
National Weather Service Salt Lake City UT
1011 PM MST Tue Feb 21 2017
.SYNOPSIS...Colder and unsettled weather will continue into Friday.
.DISCUSSION...An upper trough rippling through eastern Idaho towards
the northern Rockies this evening has pushed a cold front into Utah.
The boundary currently extends from Juab county through Rock
Springs, WY. Precipitation developed along this boundary, and a
tightly packed 700mb baroclinic zone allowed for a band of moderate
precipitation and quickly lowering snow levels. Snow has been
reported to the valley floors along the Wasatch Front from Salt Lake
The frontal boundary is still expected to stall over central Utah
overnight as the next trough deepens over the West Coast. The
heaviest precipitation will continue to focus along this boundary
tonight, but periods of precipitation will continue across northern
Utah with the upper jet lingering across the area.
Winds have decreased quite a bit behind the cold front. Breezy
southwest winds will continue to exist ahead of the cold front, but
these winds have also weakened from what was reported this
afternoon. As a result, have allowed wind highlights to expire.
The upstream trough will continue to strengthen and cross the area
tomorrow afternoon through Thursday, shoving the stalled cold front
through the remainder of Utah. Precipitation will increase in
coverage again, but focusing more on the mountains and upstream
valleys as orographics play a role under a cold and moist
northwesterly flow. Snow levels should fall to most valley floors,
although accumulations in most valleys are expected to be minor. The
northern and central mountains will see significant accumulations
with snow continuing for the next 48 hours. Decreasing snow
densities due to the colder airmass will also help with
accumulations. A Winter Weather Advisory remains in effect for the
northern and central mountains.
.AVIATION...Periods of rain and snow will continue at the SLC
terminal through the night, with showers becoming weaker and more
intermittent after 07-08z. MVFR conditions will be possible with
heavier precipitation with a 20 percent chance of IFR in snow. Winds
have become variable due to the precipitation and may continue to be
variable through at least 08z, but are expected to be more southerly
than northerly overnight.
UT...Winter Weather Advisory until 4 AM MST Friday for UTZ007>010-
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