Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 230348
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
848 PM MST Wed Nov 22 2017

.SYNOPSIS...High pressure will flatten Thursday through Friday as
a weak system passes to our north, then rebounds over the weekend.
A colder storm system is possible for Monday and Tuesday.

&&

.DISCUSSION...The axis of the large mid level high sits over wrn
UT this evening with variable amounts of high clouds streaming
thru the ridge across northern UT. Highs today responded well to
the warming aloft with a number of records set including the 68 at
SLC.

The high is forecast to flatten and shift east over the next 24hrs
as a short wave trof off the PacNW shears east into the nrn
Rockies. This pushes a shallow mostly dry cold front into nrn UT
that ends up crossing pretty much the entire CWA by late Fri.
Moisture does increase across the north late Thu night into Fri in
the cooler airmass behind the front with a few light showers
possible across the nrn mtns and along the ID border, mainly Fri
morning.

Temps tomorrow should be very mild again ahead of this front and
may end up even a bit warmer than today due to somewhat improved
mixing. The high clouds are forecast to increase thru tomorrow but
they should be thin enough at times to allow in a fair amount of
sun.

Altho the 700mb temps cool from +6C at 00z Fri to -2C at 00z Sat,
highs Fri should still be well above normal and in the 60s once
again due to better mixing.

Ridge conditions return Sat with the airmass aloft warming back
up. Sunday looks windy and mild ahead of a somewhat more amplified
and colder Pacific trof. Latest med range guidance remains at odds
on cold front timing and trof evolution starting Mon with EC much
slower and deeper.

For now no updates planned.

&&

.AVIATION...Light and variable winds at the SLC terminal are
expected to become southeasterly around 03-04Z.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...None.
WY...None.
&&

$$

Wilensky

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For frequently asked questions about the Area Forecast Discussion
visit...
http://weather.gov/saltlakecity/general/afd_faqs.php



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