Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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FXUS65 KSLC 170337

Area Forecast Discussion
National Weather Service Salt Lake City UT
837 PM MST Thu Feb 16 2017

.SYNOPSIS...A weak system will cross Utah tonight. A large slow
moving Pacific low will begin to spread moisture into Utah on
Friday then will slowly cross the Great Basin over the weekend.


.DISCUSSION...A dissipating upper trof is crossing UT this eve
with a band of clouds and what appears to be mostly virga. Cannot
rule out a few light showers especially over the mtns during the
night but the chance of measurable precip is very small.

A deepening low in the ern Pac will begin to spread moisture into
swrn UT late tonight as it nears the coast and this moisture will
increase thru the day Fri.

The low moves ashore Fri night and elongates swd as it does, it
then forms a closed low over nrn Baja by late Sat. This feature
ejects newd thru AZ and sern UT on Sun. A moist but mild southerly
flow will persist over our CWA thru Sat night with showers most
numerous across southerly flow upslope areas. a more organized
band of precip will precede the ejecting low Sat night into Sun
as the weak associated cold front crosses the CWA.

Snow levels will stay fairly high thru Sat then lower somewhat Sat
night into Sun but should still stay above most valley floors. Any
travel impact would be limited to the higher elevations above all
major transportation routes thru late Sat. There is a potential
for some winter weather impact over the major passes Sat night
into Sun with the cold front but any Winter Weather highlights
that may be needed can wait for another day or so.

Precip looks to end Sun night as short wave ridging moves in. The
next Pac trof could begin to spread precip back into the north as
early as midday Mon.

Updated forecasts earlier to initially lower pops after midnight
then again to lower them most areas for the rest of this eve. No
additional updates planned.


.AVIATION...Winds at the SLC terminal will prevail out of the
south overnight through Friday morning. However, there is a 30
percent chance winds will become light and variable or even switch
to light northerly at times between about 06z-11z. Any CIGS will
remain well abv 7000 ft.





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