Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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937
FXUS65 KSLC 180419
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
919 PM MST Tue Jan 17 2017

.SYNOPSIS...High pressure aloft will remain over the Great Basin
through Wednesday. This high pressure will give way to a series
of weather disturbances beginning Thursday lasting into next week.

&&

.DISCUSSION...A sharp ne-sw ridge axis is centered over nrn UT
this eve with clear skies over the CWA. Stratus across the nw
deserts is expanding south and east again this eve while the pool
in the wrn Uinta basin remains in place. A patch of stratus is
also noted over Bear Lake.

The airmass aloft has warmed with H7 temps now 0c over SLC in the
00z RAOB. This is generating a strong inversion and expect the
west desert stratus to continue to expand under this inversion
overnight with local fog developing in the colder nrn and central
valleys.

The ridge persists into Wed aftn then breaks down as the first of
a series of moist Pac trofs moves into the wrn states. Precip with
this first wave looks to hold off until Thu and the airmass aloft
cools just enough for precip to likely fall as snow in any
valleys with cold air trapped. The freezing rain threat appears
small. This system could bring advisory amounts of snow to the
mtns and potentially to the cold air trapped valleys due to
impact.

The next wave for late Fri into midday Sat looks a little colder
but snow amounts look a little less.

Will update to lower overnight min temps in a few spots where the
temp has already fallen below the forecast, and make so sky cover
tweaks.

&&

.AVIATION...With inversion conditions in place, expect
visibilities to fluctuate between 5-6 miles through the
overnight hours. Conditions are favorable for the development of
stratus between 10-18Z, with ceilings near 2000-2500 feet AGL. If
the stratus does not develop, there is a 20 percent chance dense
fog will develop during the same time period under clear skies.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...None.
WY...None.
&&

$$

Wilensky/Kruse

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For frequently asked questions about the Area Forecast Discussion
visit...
http://weather.gov/saltlakecity/general/afd_faqs.php



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