343
FXUS65 KSLC 012043
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
243 PM MDT Mon Sep 1 2025

.SYNOPSIS...Warm and dry conditions will remain in place across
Utah and southwest Wyoming through at least Tuesday. Moisture
gradually increases from midweek forward, bringing increasing
chances for showers and thunderstorms, especially by the weekend.

&&

.SHORT TERM (Through 12Z/6AM Wednesday)...Mid level ridging
centered across the Intermountain Region will maintain a dry and
warm airmass across the forecast area through the short term
period. Daytime temperatures will continue to run roughly 5F above
climo, reaching the low 90s along the Wasatch Front and just above
the century mark near St George and Zion Canyon. With this ridge
in place winds across the forecast are will remain light and
terrain driven. Daytime heating has allowed high based cumulus to
develop across the terrain, and this will be the case again
Tuesday. An isolated shower or thunderstorm can`t be ruled out
late this afternoon and again Tuesday afternoon.


.LONG TERM (After 12Z/6AM Wednesday), Issued 412 AM Monday...A
shift in the pattern begins on Wednesday as the stout ridge
overhead begins to break down in response to a deepening longwave
trough over the Upper Midwest. Increased southerly flow under this
pattern will transport tropical moisture into eastern Nevada and
far southwest Utah on Wednesday, resulting in increased chances
for afternoon thunderstorms across these areas. Given drier lower
levels still in place, dry microbursts will be the main threat for
any storms that develop.

Moisture will continue to be drawn up into the Great Basin on
Thursday, with PWAT anomalies increasing to around 150-200% above
normal across Nevada and southwest Utah. A closed low off the coast
of northern California is expected to swing eastward on Friday,
shunting this anomalous moisture eastward, allowing it to overspread
the entirety of Utah and southwest Wyoming through the weekend. As
such, afternoon showers and thunderstorms will be a daily feature
through the end of the week, with the main weather concern of dry
microbursts gradually transitioning to a flash flood threat as early
as Friday. Anyone with outdoor plans during the latter half of the
week should stay tuned to the forecast as details come into focus.

&&

.AVIATION...KSLC...The SLC terminal will see VFR conditions
through the evening with some scattered clouds. Northwest winds
are expected to shift to the southeast between 03Z and 05Z.

.REST OF UTAH AND SOUTHWEST WYOMING...The airspace will see VFR
conditions through the evening with some scattered cumulus over
the higher terrain into the early evening. Winds will be generally
light and diurnally driven.

&&

.FIRE WEATHER...High pressure centered across the Intermountain
Region will maintain a warm and dry airmass through the first
half of the week. Daytime temperatures will continue to run around
5 degrees above normal, with low daytime RH and marginal
overnight recovery. With this high in place, winds will remain
largely terrain driven through Wednesday.

Moisture will begin to work its way back into the region as early
as late Tuesday afternoon across southwest Utah, then gradually
increase and spread northward through the latter half of the week.
This will initially bring a chance for high based showers and dry
thunderstorms late Tuesday into Wednesday across southern Utah.
By Thursday this moisture will spread across the remainder of the
area, with storms transitioning from dry to wet Thursday into
Friday. This chance for showers and thunderstorms will continue
into the upcoming weekend. With the increase in moisture,
temperatures will trend cooler while RH trends higher for the
latter portion of the week.

&&

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

$$

SHORT TERM...Seaman
LONG TERM...Whitlam
AVIATION...Traphagan
FIRE WEATHER...Seaman

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