Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 211729

Area Forecast Discussion
National Weather Service Salt Lake City UT
1029 AM MST Sun Jan 21 2018

.SYNOPSIS...A Pacific storm system will exit east into Colorado
today. High pressure will briefly return on tonight, followed by a
weak storm grazing northern Utah on Monday. A stronger storm is
expected during the latter part of the week.


.DISCUSSION...Morning water vapor imagery and objective analysis
show an upper low rotating into the high plains region while
shortwave ridging builds across the Great Basin. A subtle
vorticity maxima along the back side of the departing low is noted
crossing northern Utah, and along with orographic forcing is
helping to maintain pockets of light snow across the higher
terrain. Satellite imagery also depicts an expansive layer of
stratus across much of western Utah, which is beginning to erode
along the northern edge over the past hour or so. Updated earlier
to increase cloud cover through the morning, and may need to
increase afternoon cloud cover as well.

Meanwhile gusty downslope winds continue across Castle Country
where a Wind Advisory remains in effect until noon. Winds have
been gradually diminishing over the past couple of hours, and
anticipate this advisory will be allowed to expire as scheduled.

The upstream shortwave ridge axis is forecast to translate east
across the area tonight, as a shortwave trough makes landfall and
moves inland across the Pacific Northwest. This feature will pass
north of the forecast area Monday, however a trailing region of
warm advection coupled with a plume of moisture will bring a
chance of light snow to areas north of I-80 during the day.


.AVIATION...The SLC terminal will see VFR conditions throughout
the day. Cigs around 7000 feet are expected to scatter out between
19Z and 21Z but there is a 20 percent chance they will stick
around longer than expected. Northwest winds will continue during
the daytime hours.


UT...Wind Advisory until noon MST today for UTZ012.




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