Area Forecast Discussion
Issued by NWS Salt Lake City, UT

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000
FXUS65 KSLC 062252
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
352 PM MST Wed Dec 6 2017

.SYNOPSIS...Strong high pressure centered to the west of Utah
will maintain a stable northerly flow across the Great Basin
through the end of the week.

&&

.SHORT TERM (Through 12z Saturday)...Most of the valley stratus
and fog from northern Utah valleys has finally mixed out this
afternoon, and temperatures have warmed in the Cache Valley but
still remain below freezing. Cold air aloft continues to poor in
from the north under northerly flow with the ridge building to the
west.

A fairly broad area of tight surface pressure gradient exists
across far southwest Utah, which led to strengthening winds this
afternoon. A high wind advisory was issued for strong canyon winds
expected to persist through the overnight hours before diminishing
Thursday morning as the gradient relaxes.

With the ridge building to the west and persisting through the
remainder of the week, winds are forecast to become weaker
Thursday onward. Temperatures aloft will remain on the cool side,
with little day to day change. As inversion conditions continue to
develop, air quality will deteriorate through the week.
Surface temperatures day to day will see little change, and
valleys may remain cooler than outlying higher elevation areas
including benches. Have included fog in the forecast for valleys
that are especially prone to patchy fog like the Cache Valley for
the next several mornings, seeing how the previous couple of days
have played out. It`s possible other valleys may see reduced
visibility and low stratus develop as well.

.LONG TERM (After 12Z Saturday)...Persistence is the best bet through
the long term. Just going with the idea that at some point we could
see stratus or fog in some mountain valleys, Wasatch Front and west
desert, but if and when that day comes is not apparent at this time.
Definitely a stagnant weather pattern that looks to persist for many
days. Ugh. Warming temps in the mountains but basically straight
lining in the northern and central valleys in the extended.

&&

.AVIATION...Light northerly winds at the KSLC terminal are
expected to become southeast after about 08Z but there is a 40%
chance that winds will remain light northerly through the night.
VFR conditions are expected to prevail through the TAF period.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...High Wind Warning until 9 AM MST Thursday for UTZ019.

WY...None.
&&

$$

SHORT TERM...Dewey
LONG TERM/AVIATION...Struthwolf

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http://weather.gov/saltlakecity

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



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