Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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851
FXUS65 KSLC 180450
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
950 PM MST Fri Nov 17 2017

.SYNOPSIS...A cold upper level trough will move out of Utah
tonight. High pressure aloft will spread across the region this
weekend. A weak weather disturbance will graze northern Utah
Monday night, followed by strong high pressure aloft returning
midweek.

&&

.DISCUSSION...The axis of the cold upper trof is over ern UT
this evening with a cold northwest flow over the rest of the area.
The front has moved out of the CWA and the last bands of synoptic
post frontal precip across the central and srn mtns have ended.
Stratus is still banking up against the mtns and there is
apparently enough low level instability remaining to set off some
orographic snow showers over the mtns downwind from the Great Salt
Lake.

Increasing stability as the upstream ridge moves into the CWA
should bring an end to any snow showers after midnight and the
stratus should gradually dissipate as well.

Breezy northerly winds have persisted across much of the CWA thru
the evening but are now starting to drop off over the west and
have diminished enough over the south and east to allow the
advisory to expire. However, expect local gusty winds to persist
across the south and east thru the night. Winds have actually
increased somewhat thru the gaps in far swrn UT in the last couple
of hours as the post frontal surface gradient tightened up and
these will remain locally strong into early Sat.

Low levels have dried considerably across the north thru the aftn
and eve and with winds still blowing in places, do not see much
of a fog threat tonight, even once the winds drop off.

Still expect a cold night in most locations where skies have
cleared and where winds drop off.

Heights rise over the next 24 hours and the airmass strongly
warms as the upstream ridge advances into the Great Basin and
low level winds become light. The valleys will struggle to warm
under the very stable conditions and even the higher elevations
may not respond all that well due to the fresh snow cover.

Updated earlier to adjust pops, winds and sky cover somewhat for
the night, and to remove mention of fog for tonight and Sat
morning. No additional updates planned.

&&

.AVIATION...VFR conditions are expected at the SLC terminal
through the evening, with occasional cigs near 5000 ft until about
06z. Northerly winds are expected to shift to the southeast
between 06Z and 08Z with a chance that they do not shift until 10z
or so.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Wind Advisory until 9 PM MST this evening for UTZ013-020-021.

WY...None.
&&

$$

Wilensky/Struthwolf

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