Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 150346

Area Forecast Discussion
National Weather Service Salt Lake City UT
946 PM MDT Thu Sep 14 2017

.SYNOPSIS...A cold front will bring cooler and wetter conditions
to Utah and southwest Wyoming through Friday. A milder
southwesterly flow will return for the weekend. Another
unseasonably cold storm system will impact the forecast area early
next week.


.DISCUSSION...A deep cold trof continues to dig into the PacNW
and nrn Rockies this eve as the remains of the CA closed low eject
out of the CWA. Flash flood producing heavy rains occurred across
portions of srn UT today as the low crossed the CWA and an
organized line of storms generated strong winds over sern UT in
the afternoon including Lake Powell where several houseboats were

Deformation between the ejecting low and the upstream trof
continues to generate lift across nrn and wrn UT this eve and
showers have been filling in across these areas. Expect this to
persist overnight. A cold front associated with the upstream trof
is still forecast to cross the nrn CWA tomorrow morning accompanied
by a broad swath of precip. However the satellite presentation of
the digging low seems to imply less organization with the front
and the precip could end up in loose clusters of showers.

Either way, colder air will work into the CWA by afternoon with
lowering snow levels. Showers may become less numerous over the
north by then and the threat of high elevation snowfall looks

Any lingering precip in the evening should end by midnight with a
drier and warmer day expected for Sat.

Updated earlier to lower pops across the south and the Wasatch
Front for the evening. Will update again to raise pops over the
southwest overnight.


.AVIATION...Winds at the SLC terminal are expected to remain out
of the south through about 05z. A band of showers will bring a
shift to northwest between about 05-06z and possible cigs around
7000 ft. Winds could return to light southerly after about 07-09z
then switch to northwest again with a cold front around 14-16z
with cigs falling below 6000 ft in rain. MVFR vis/cigs are
possible after 16z.





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