Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 250318

Area Forecast Discussion
National Weather Service Salt Lake City UT
918 PM MDT Sat Sep 24 2016

.SYNOPSIS...Building high pressure will bring dry conditions with
a warming trend through the first part of the week. A storm
system moving up from the south is expected to bring moisture
back to the area by midweek.


.DISCUSSION...A cool northerly flow is over the area between the
departing cold upper low and strong ridging building just off the
west coast. The airmass is drying out and the shallow cumulus
clouds that were prevalent over the nern CWA are rapidly clearing.

The cool airmass and clearing skies will bring patchy frost to the
normally colder valleys of nrn and central UT tonight into Sunday
morning. There is also a possibility of shallow ground fog in the
Cache and Wasatch mtn valleys with all the recent rain.

The northeasterly flow over the area tonight will result in some
gap winds in the prone areas of Washington county, but these
should remain below advisory criteria.

The ridge nudges slowly ewd thru Mon bringing a dry, stable and
warmer airmass. Mixing will be good enough however that valleys
should still respond to the warming.

The exiting upper low is splitting with the srn portion forecast
to close off by Sun morning over nrn Mexico. This closed low
meanders slowly wwd thru Mon drawing in tropical moisture from ern
Mexico and TX. The low then starts to lift n Tue with some of
this moisture spreading into srn UT then the low accelerates nwd
Wed spreading the moisture across the CWA.

Updated forecasts earlier to add mention of local frost to the
Cache, Wasatch Mtn and Sanpete/Sevier valleys for tonight. Also
raised sky cover a bit for this eve. No additional updates


.AVIATION...Skies have cleared at the SLC terminal and will
remain clear overnight. Light southeasterly winds will prevail
into Sunday morning.





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