Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 240258

Area Forecast Discussion
National Weather Service Salt Lake City UT
858 PM MDT Fri Sep 23 2016

.SYNOPSIS...A cold and moist storm system will impact Utah and
southwest Wyoming through tonight. High pressure will bring a
drier and more stable airmass for the weekend through the first
part of next week. A storm system is expected to bring moisture
back to the forecast area by midweek.


.DISCUSSION...The cold upper low is centered over swrn WY this
evening with wrap around moisture covering all but the far srn
and sern CWA. Cloud cover is extensive but precip is mostly
confined to the nrn and central mts and the nwrn valleys. Some
light precip could be falling south to around Beaver along the
I-15 corridor in low level orographic upslope. Snow is falling
down to around 7000 ft in the nrn mtns and the existing advisory
will remain in effect.

The precip will persist thru most of the night in these areas then
start to taper off towards sunrise. It should be over with by noon
in most areas with a few lingering mtn showers over the Uintas as
the low moves into the plains states.

Clearing skies Sat night will bring areas of frost to the
normally colder northern and central UT valleys.

Models over the last several runs have been consistently showing
a srn portion of the low breaking away Sat night and forming a
new closed low over nrn Mexico Sun morning while high pressure
builds into the Great Basin. This low then migrates slowly wwd
and taps into tropical moisture drawing it north into AZ on Mon
and into far srn UT on Tue.

Models have been struggling with the evolution of this low after
Tue but it does appear that the associated moisture will spread
nwd into the CWA midweek.

For now, no updates planned.


.AVIATION...Rain will continue at the SLC terminal through most of
the night. MVFR CIGS look to prevail with occasional MVFR VISBYs.
The rain should gradually become lighter after about 08z with
conditions occasionally improving to VFR then prevailing VFR after
about 11z. Light and variable winds will become prevailing light
southeasterly after about 04-05z.


UT...Winter Weather Advisory until 10 AM MDT Saturday for UTZ007>009.




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