789
FXUS65 KSLC 110439
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
1039 PM MDT Wed Jun 10 2026

.KEY MESSAGES, Issued 1033 AM MDT Wed Jun 10 2026...


- Strong winds will accompany a dry cold front as it progresses
  southward through southern Utah during the overnight hours,
  especially through Black Ridge Canyon between Cedar City and St.
  George.

- Temperatures will steadily warm Friday and Saturday, reaching
  around 5-10F above seasonal normals, increasing again from
  Monday forward and reaching 10-15 degrees above normal by
  Wednesday.

- Increasing moisture over southern Utah will bring a few
  afternoon showers and thunderstorms over the higher terrain with
  the potential for isolated dry lightning Saturday and Sunday.
  Increasing winds Sunday into Monday will also increase the fire
  danger over southern Utah.

&&

.DISCUSSION...A dry cold front will continue its progression
through Utah during the overnight hours, bringing a period of
stronger northerly winds as it progresses southward. Already, wind
gusts of up to 35-40 mph have been observed across northern Utah
as the boundary moved overhead. Similar wind gusts can be expected
across central and southern Utah, especially along and west of the
I-15 corridor, through the overnight hours. Channeling of winds
through terrain constrictions between Cedar City and St. George
are likely to cause winds to increase significantly, with peak
gusts expected between 50 to 55 mph along the I-15 corridor from
Kanarraville to Toquerville (and farther south into Hurricane). As
of the latest suite of hi-res model guidance, there is around a
10% chance of winds exceeding 60 mph. Given the high probability
of wind gusts in excess of 45 mph through this area (90% chance),
a Wind Advisory for lower Washington County will go into effect
from 3AM through 9AM. After 9AM, these strong gap winds will
decrease as the effects of thermal mixing allow for less
constriction of winds.

With a cooler air mass in place across the region, temperatures
across much of the forecast area will top out around 5-7 degrees
below climatological average. The exception to this will be lower
Washington County, where high temperatures will see very little
change and top out in the low 100s. Thursday will also feature a
nice relief from strong winds across Utah and southwest Wyoming as
overhead winds weaken and conditions stabilize.

A warm southerly to westerly return flow is expected to spread
over the area on Friday, allowing for a significant jump in
temperatures (particularly for northern Utah). High temperatures
will return to above normal levels on Friday, with slight
moderation by Sunday, and another warming trend being introduced
from Monday forward as high pressure strengthens over the Great
Basin region. As high temperatures reach upwards of 10 degrees
above normal (pushing 93-95 degrees on the Wasatch Front and 105
in St. George by Tuesday/ Wednesday), risk of heat related illness
will greatly increase. In fact, there is upwards of a 90% chance
of HeatRisk reaching the "moderate" category (greatly affecting
those sensitive to heat and those without access to adequate
cooling/ hydration) and around a 15-20% chance of reaching the
"Major" category (affecting a majority of the population). Will
continue to monitor this potential as we head through the week.

Lastly, this evening`s model guidance has shown a notable
increase in potential for increased moisture content to push into
southern Utah over the upcoming weekend. While it`s not quite what
we`d describe as "monsoonal moisture", precipitable water
(measure of total atmospheric water content) values (per ensemble
output) will be pushing upwards of 200-215 percent of normal. With
this increase in moisture over southern Utah, anticipate
increased chances for afternoon shower and thunderstorm develop,
especially over significant terrain features and adjacent valley
areas. Given the low moisture content in the sub-cloud environment,
a widespread threat of flash flooding is not expected. However,
at least an isolated threat of flash flooding should be
anticipated with the thunderstorm potential over slot canyons, dry
washes, and recent burn scars.


&&

.AVIATION, Issued 933 PM MDT Wed Jun 10 2026...
KSLC, Issued 933 PM MDT Wed Jun 10 2026...
VFR conditions prevail at the terminal through
the TAF period under clear skies. Gusty northwesterly post-frontal
winds taper off between 04-05z, becoming lighter overnight. There is
potential for winds to become more variable between ~13-16z this
morning as a drainage winds compete with prevailing northwest flow,
but otherwise generally light northwest winds continue.

.REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions prevail for all
regional terminals under clear skies across the airspace. A dry cold
front will continue to move south across the airspace through early
Thursday morning. Gusty north to northwesterly flow will accompany
the frontal passage, with gusts 20-30 kts expected for most regional
terminals across central and southern Utah. Otherwise, lighter winds
prevail through the remainder of Thursday except KSGU, where canyon
gap winds may keep gusts elevated into the late morning.

&&

.FIRE WEATHER...Very dry conditions continue over the state of
Utah today. West to southwest winds will remain elevated ahead of
an approaching front that will move through the area late this
afternoon into the evening. Thus, the Red Flag Warning continues
for southeastern Utah due to the combination of gusty winds and
low relative humidity values. Have added northwest Utah to the Red
Flag Warning for today as winds become quite gusty during the late
afternoon and early evening with the passage of the front. Though
relative humidities will be rising, it looks like they will still
be low enough to produce areas of critical fire weather
conditions. Winds will relax Thursday into Saturday under the
influence of a Pacific ridge, though relative humidities will
remain rather low with poor overnight recoveries. There is a high
chance of moisture increasing over southern Utah Saturday with
lower levels remaining dry. Thus, there is the potential for
afternoon storms over the higher terrain that will produce little
in the way of rainfall, bringing the potential for dry lightning,
and this could continue for Sunday afternoon. Winds are expected
to increase Sunday into Monday ahead of another cold front, and
this may be another factor that increases fire danger over
southern Utah.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Red Flag Warning until 10 PM MDT this evening for UTZ478-484-489-
     493-494-496-498.

WY...None.
&&

$$

PUBLIC...Webber
AVIATION...Whitlam
FIRE WEATHER...Traphagan

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