Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 220418

Area Forecast Discussion
National Weather Service Salt Lake City UT
918 PM MST Sat Jan 21 2017

.SYNOPSIS...The active weather pattern will continue across the
region, with a series of weather systems crossing the area through
the first half of next week.


.DISCUSSION...A shortwave ridge will continue to build into Utah
this evening. Precipitation has largely tapered off except some
isolated snow showers near the Cache Valley/Bear Lake area where the
500mb cold pool is still overhead but in the process of exiting the
area. Skies have trended clearer across some of the central and
southern Utah valleys but upstream high/mid clouds will increase
later tonight ahead of the next storm system.

This next storm, currently riding a strong jet towards the West
Coast, will begin to impact the area tomorrow morning as copious
moisture penetrates into southwest Utah and 700mb warm advection
strengthens under an increasing southwesterly flow aloft.
Precipitation will spread across all southwest-facing slopes and
upstream valleys during the day tomorrow. Snow levels will rise
given the warmer airmass and good mixing, and may at times be closer
to 5000-5500ft late tomorrow afternoon through tomorrow night. As a
result, some valleys may see brief periods of rain or rain/snow mix.
Ridgelines and western valleys will likely see breezy to windy
conditions as the pressure gradient tightens through tomorrow night.

Cold frontal passage on Monday will shift focus more to northwest-
facing slopes and upstream valleys, including the I-15 corridor.
Overall, fairly long-duration system and moist airmass will yield
relatively significant QPF. Snow amounts will be a bit limited by
the mild airmass preceding the cold front, but still likely to see
accumulations areawide except Dixie and Lake Powell during the
Sunday through Monday timeframe. Winter Storm Watches remain in

Will update the forecast mainly to decrease PoP/Sky for the rest of
the night.


.AVIATION...Ceilings at the SLC terminal are expected to remain
at or above 7kft through the night, with a 20 percent chance of
dipping below that level. Otherwise, southeast winds will likely
remain in place through tonight and tomorrow, strengthening and
becoming gusty in the afternoon.


UT...Winter Storm Watch from Sunday morning through late Monday night
     for UTZ007>010-517.

     Winter Storm Watch from Sunday morning through Monday afternoon
     for UTZ001-002-006.

     Winter Storm Watch from 5 AM MST Sunday through late Monday
     night for UTZ518.

     Winter Storm Watch from Sunday morning through Monday morning
     for UTZ012.

WY...Winter Storm Watch from Sunday morning through Monday afternoon
     for WYZ021.




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