St. George, Utah 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

006
FXUS65 KSLC 142216
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
316 PM MST Wed Jan 14 2026

.KEY MESSAGES...

- Inversions will remain in place for prone Utah valleys through
  at least Friday. The stagnant air will lead to decreasing air
  quality and visibility, particularly along the Wasatch Front.

&&

.DISCUSSION...Strong high pressure remains centered over the Great
Basin this afternoon, resulting in a dry northerly flow aloft over
Utah and southwest Wyoming. The airmass over the area remains
quite mild, with 700mb temperatures in the +2C to +6C range.
However, persistent inversions over the prone valleys of northern
Utah are keeping temperatures much cooler, with highs near
seasonal normals. Particulates are also accumulating in the
valleys due to the inversions, resulting in a steady decline in
air quality and visibility.

On Friday, the ridge is expected to recenter itself along the
Pacific Northwest coast as a trough dives into the central United
States. This system will be too far east for significant impacts
over Utah and southwest Wyoming, but will cool the airmass aloft
somewhat. There is a low (30 percent or so) chance that the
airmass will cool sufficiently to mix out valley inversions, but
it is far more likely that this will act to weaken the inversions
some but not fully mix them out. This will also bring
temperatures outside of inversions back closer to normal for this
time of year.

There is high confidence that the Great Basin ridge will rebuild
over the weekend into early next week resulting in dry conditions,
light winds, and inversions continuing/re-strengthening. Ensemble
guidance continues to indicating a storm system impacting the area
late next Thursday into Friday with sufficient cold air to mix out
inversions, but the members are trending to solutions that would
bring less in the way of winds in precipitation. Confidence in any
particular solution remains low this far out, however.

&&

.AVIATION...KSLC...Haze is expected to persist at the terminal
through the TAF period resulting in continual MVFR vsbys. Vsbys will
drop tomorrow morning due to mist developing to around 3-4SM,
improving somewhat by the afternoon. There is a chance for fog
development late this evening into tomorrow morning which may bring
borderline IFR vsbys, though high uncertainty exists regarding this
solution.

.REST OF UTAH AND SOUTHWEST WYOMING...MVFR vsbys will continue along
the Wasatch Front as haze persists. Additionally, there exists some
potential for fog development at KLGU from 09-13Z, perhaps lingering
somewhat if it becomes more widespread. Vsbys improve somewhat to
6SM at KLGU in the late morning, though haze will persist. For all
other sites, VFR conditions will persist through the period.

&&

&&

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

$$

PUBLIC...Traphagan
AVIATION...Worster

For more information from NOAA`s National Weather Service visit...
http://weather.gov/saltlakecity