Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 160413

Area Forecast Discussion
National Weather Service Salt Lake City UT
1013 PM MDT Fri Sep 15 2017

.SYNOPSIS...A cool upper trough will linger over the area tonight
then shift east on Saturday. A milder southwesterly flow will
return for Sunday and Monday. Another unseasonably cold storm
system will impact the region beginning Tuesday of next week.


.DISCUSSION...The axis of the cold upper trof remains just to
our west this evening and weak lift ahead of it has generated a
few showers over the northern CWA. Additional light showers have
also persisted into the evening over central and srn UT along and
north of the old cold front as it moves out of the state.

Expect the showers to linger across these portions of the CWA
thru the early morning hours then end as the trof axis shifts

The northerly surface gradient tightens across southern UT
overnight in the wake of the front and local gusty downslope winds
could develop thru the gaps in swrn UT. These are not expected to
get too strong and should end after noon tomorrow.

Short wave ridging should keep the CWA dry on Sat with warming
temps. A weak trof crosses the CWA on Sun and could set off a
little convection over the north. Temps will continue to warm on

A deeper colder trof moves into the PacNW and nrn Rockies on Mon
and the flow over the CWA backs to swly and increases. This will
bring breezy south winds to the valleys and the warming trend will

Models are now in pretty good agreement on pushing a cold front
into nrn UT Tue morning with colder air spreading in behind it
along with a chance of precip. The south stays warm, dry and
windy on Tue.

Updated earlier to adjust pops based on current trends. No
additional updates planned.


.AVIATION...Southeasterly winds at the KSLC terminal will shift
back to northwest between about 0430z and 05z. The winds should
switch back to light southeast between 0900-1100 UTC. However, there
is a 30 percent chance that the winds will stay out of the northwest
through the night. Passing showers and possible t-storms (15%
chance) could produce brief erratic gusts until about 11z.






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