Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 050508

Area Forecast Discussion
National Weather Service Salt Lake City UT
1008 PM MST Sun Dec 4 2016

.SYNOPSIS...A cold front will enter northern Utah late tonight,
then sweep south into central Utah early Monday. The much
colder temperatures behind the front will turn even colder as a
second storm system will bring snow and the coldest temperatures of
the season to most of Utah and southwest wyoming for midweek.


.DISCUSSION...A shortwave trough is sagging into Oregon and southern
Idaho this evening while Utah remains under a mild west-northwest
flow aloft. Weak showers/virga have filled in over northern Utah per
KMTX, although little precipitation appears to have made it to the
ground thus far in the valleys where dew point depressions are still
relatively large.

The cold front is expected to reach far northern Utah over the next
couple of hours and continue to sag across northern Utah overnight,
reaching central Utah by sunrise. Precipitation is expected to
increase over the northern Utah mountains ahead of the front, then
fill in more over the valleys along the surface front and 700mb
baroclinic zone. However, because the cold air aloft and 500mb
energy will remain just north of Utah, the support for precipitation
should wane as the front heads into central Utah. As a result, expect
a generally brief period of valley snow near the cold front for
northern Utah with very minor accumulations. Mountains will see a
longer duration of snow, but even so, snow should start tapering off
over the northern Wasatch by midmorning and over the central/southern
Wasatch by midday tomorrow. Otherwise, a moderate to strong 700-500mb
flow should lead to gusty winds along ridgetops and in southwest
Wyoming, with blowing and drifting of snow.

Made minor updates to PoP/Sky/MinT for the rest of the night into
early tomorrow morning.


.AVIATION...VFR conditions and southerly winds will prevail at the
KSLC terminal through late tonight before winds turn northwest
behind a cold front which is expected to arrive within in the 09-11z
timeframe. CIGS are expected to 6kft or lower after 06-07z...then
MVFR to IFR conditions in snow will develop behind the cold front.
Snow is expected to be brief and mostly taper off by mid-morning
Monday with conditions improving to VFR.





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