St. George, Utah 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

670
FXUS65 KSLC 302122
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
322 PM MDT Sun Mar 30 2025

.SYNOPSIS...An active pattern will continue to bring periodic
precipitation and near to below normal temperatures to the Beehive
State for the next seven days. The most significant storm of the
period is expected Monday evening into Tuesday night, with
impactful snow falling across the higher terrain of Utah.

&&

.SHORT TERM (Through 12Z Wednesday)... Active weather is expected to
continue through the short term into the long term portion of this
forecast package. Currently, satellite water vapor imagery indicates
ridging building into the area which will continue through the
afternoon into late tomorrow afternoon. Ridging will slide east
tomorrow afternoon as a longwave upper trough pushes into the
forecast area bringing unsettled weather with it.

On Monday morning, ridging begins to traverse east across the
Rockies as an upper trough moves in from the West. A 700mb
enhancement in flow around 40-50kts appears to move into the area in
the late afternoon Monday atop a well mixed boundary layer across
southern and central Utah. This will result in notably gusty
conditions across the state with the aforementioned regions seeing
gusts up to 55mph at the surface. As such, a wind advisory has been
issued. Blowing dust across the west desert, with an emphasis
regarding areas near the Sevier Lake bed, as conditions have
remained relatively dry across the area. Visibilities could be
reduced to around a mile at times.

Regarding precipitation, PoPs will increase ahead of a cold front as
better moisture and favorable dynamics overspread the forecast area
tomorrow afternoon into the early evening hours as the upper trough
begins to shift west toward the area. All valleys will remain socked
in with rain through the early to mid evening hours as snow levels
generally remain above 6500-7000ft ahead of the cold front. Higher
elevation mountains will see snow begin in the late morning to early
afternoon hours with rates increasing notably as the cold front
approaches. Additionally, there is a noteworthy signal for 1"/hr
rates as the cold front moves through in the late evening hours
across the Wasatch and Manti-Skyline mountains. In fact, there is a
reasonable chance (generally 50%) that areas around Alta could see
2"/hr rates when the cold front pushes through.

Following the cold fronts passage, northwest flow will take hold
once again. Scattered snow showers are expected to continue across
our mountains through early Wednesday morning before a brief respite
ahead of our next system in the long term portion of the forecast.
Following the passage of the cold front, snow levels are forecast to
plummet to around 3000-4000ft, bringing snowfall to the valley
floors across the majority of the state with the exception of lower
Washington County. While accumulations are not expected to be major,
particularly due to the timing and preceding surface temperatures,
some slush could be possible. Snowfall totals across our Utah
mountains generally range from 6-12" with locally higher amounts
across the Manti-Skyline mountains (10-17") and the Wasatch
mountains (up to 2 feet) possible.

.LONG TERM (After 12Z/6AM Wednesday)...Ensemble cluster models
continue to agree on long term persistence of a broad trough over
the four corners region, with minor differences over the position of
the trough axis. Resulting solutions converge on active weather
remaining through the workweek across the region, with below normal
temperatures.The main change from previous runs is a greater focus
of precipitation in the central and southern Utah mountains, with
the WPC/NMB collusion suggesting snow amounts approaching advisory
levels there on Wednesday afternoon. Subsequent systems are expected
to yield well-below advisory amounts across the CWA through the end
of the forecast period.

The start of the long term should bring the biggest impacts, with
the evolution of a closed low promoting southern Utah snow amounts
approaching a half foot in the Tushar Mountains by Wednesday
afternoon. Temperatures will be running about 10 degrees below
normals across the region, thus snow levels should keep any
precipitation in the CWA as snow to valley floors, though valley QPF
looks to remain in the 0.1-0.2 inch range even in the NBM 90th
percentile. Another potential impact of note for Wednesday is the
threat of anomalously low max temps in the area extending from
Castle Country through the San Rafael Swell and to the southern Utah
Mountains. In case you were thinking of wearing shorts to recreate.

Temperatures across the region begin the inexorable climb to
seasonal norms by the weekend. Lingering instability may keep snow
showers going in the northern mountains for Thursday, with weak
waves extending precip chances there through the start of the
weekend. For the southern half of the CWA, a majority of guidance
points to another closed low moving through the southwest on
Thursday, keeping the threat of precip in the central/southern
mountains into early weekend. Should this closed low come to
fruition, there exists a threat of enhanced canyon winds along the
Wasatch Front sometime in the Friday-Saturday timeframe.


&&

.AVIATION...KSLC...Very low chance (~15%) of rain showers through
about 04Z. Main impact of any showers would be erratic winds and
CIGs down to about 4kft. Otherwise, VFR conditions expected. Given
weak westerly pressure gradient in place, wind direction forecast is
low confidence through ~02Z. Until then, guidance is nearly evenly
split on NW winds vs a continuation of S winds. A period of variable
winds is likely as well in this timeframe. After 02Z, much higher
confidence in SSE winds redeveloping. Winds will increase and become
gusty (up into the 20-25kt range) by late morning and continuing
through the afternoon. Expect increasing rain shower chances by late
afternoon.

.REST OF UTAH AND SOUTHWEST WYOMING...Isolated showers near the
Idaho border will diminish as the evening progresses. Widespread
showers will redevelop near the Idaho border and across SW Wyoming
after 20Z Monday ahead of an approaching cold front with associated
diminishing ceilings. These degraded conditions will sink southward
across the remainder of northern and central Utah Monday evening.
Across southern Utah, gusty SW winds of 15-25kts with gusts of 40-
45kts expected to develop Monday afternoon and continue through the
evening. More sheltered valleys like in the SGU vicinity will see a
delayed onset of winds until around 20-22Z. Strongest winds expected
here between 00Z-06Z, with southwest gusts in the 25-35kt range.
Across the southern half of Utah Monday afternoon and evening, minor
reductions in visibility likely due to blowing dust.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Winter Weather Advisory from 6 PM Tuesday to 6 PM MDT Wednesday
     for UTZ108.

     Winter Weather Advisory from 6 PM Monday to 6 PM MDT Wednesday
     for UTZ110>113-117.

     Wind Advisory from noon to 9 PM MDT Monday for UTZ115-116.

     Winter Weather Advisory from 10 PM Monday to 6 AM MDT Tuesday
     for UTZ116.

     Wind Advisory from noon Monday to midnight MDT Monday night for
     UTZ121-122-126>128-130-131.

WY...None.
&&

$$

SHORT TERM... Worster
LONG TERM... Verzella
AVIATION... ADeSmet

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