Special Weather Statement, NWS Salt Lake City, UT

Area Forecast Discussion
National Weather Service Salt Lake City UT
1226 PM MDT Sat Aug 29 2026

.KEY MESSAGES, Issued 1151 AM MDT Sat Aug 29 2026...

- Multiple rounds of scattered showers and thunderstorms are
  expected to occur this afternoon across UT, primarily northern
  and central UT where strong to severe storms are expected.

- Flash flooding concerns exist across UT today through at least
  Monday. Of the days within this stretch, Monday looks to be the
  most concerning.

- Weather areawide may calm down somewhat by midweek, though some
  uncertainties remain regarding this solution.

&&

.DISCUSSION, Issued 1151 AM MDT Sat Aug 29 2026...
Currently, a deepening upper trough is pushing
inland with its axis centered over WA/OR with a shortwave to its
southeast progressing NE through the Great Basin. Ample mid-level
mass response has developed an enhanced belt of southwesterlies
atop strong mid-level frontogenesis, serving as a focal point for
thunderstorm development across northern UT this morning. A few
severe wind gusts have been observed primarily across the Great
Salt Lake Desert with sub-severe hail closer to the Wasatch Front,
though northeasterly winds and surface temperatures in the 60s
have largely limited the severe threat keeping storms elevated
instead of surface based due to a stable boundary layer. A few
stronger gusts can't be ruled out with this complex as it moves
further east into the Uinta basin where surface temperatures have
continually warmed this morning in the absence of cloud cover,
though gusts are not expected to be widespread.

Through the remainder of the afternoon, multiple shortwave
perturbations embedded within the flow will traverse northwest UT
serving as a focal point for thunderstorm development. Continual
moistening of the boundary layer with daytime heating increasing
with the erosion of a persistent cloud deck should result in
increasing instability generally south of a line extending from
Wendover to Salt Lake City yielding MLCAPE values from
1000-1500J/kg, perhaps higher if cloud cover clears faster.
Additionally, enhanced southwest flow aloft will result in Eff.
Shear values exceeding 40kts across a large portion of northern UT
to central UT, supporting the development of supercells capable of
wind gusts potentially in excess of 70mph and hail to around 1".

Flooding remains a concern today as well, particularly if more
supercellular convection develops given the moist environment
characterized by PWATs from 1-1.3" of water. However, this threat
may be limited by fast ENE storm motions today, though would still
pose a problem if storms are to track over problematic terrain and
burn scars.

Tomorrow, the upper trough progresses through ID serving as a
focal point for widespread thunderstorm development tomorrow
afternoon across UT. Moisture, instability, and shear leave much
to be desired, though portions of southern UT may see some flash
flood threat develop with slower moving storms associated with a
trailing wave. Come Monday, the threat for flash flooding across
southern UT increases substantially as a stronger moisture surge
races north. High PWATs, potentially as high as 1.3-1.5" of water
are expected to advect north amidst an environment favorable for
slow moving (and potentially backbuilding) storms. Some
uncertainties exist regarding this, though Monday is shaping up to
be quite wet across southern UT in particular.

&&

.AVIATION, Issued 1216 PM MDT Sat Aug 29 2026...

KSLC...Southerly winds will vie with northerlies with passing
showers and thunderstorms this afternoon into early evening.
Widespread storms are expected to redevelop across northern Utah
after 22z and are expected to impact the terminal at times through
the remainder of the evening. Storms this afternoon will be capable
of producing gusty and erratic outflow winds in excess of 50 kts,
hail, and heavy rainfall that may result in periods of MVFR to IFR
conditions.

REST OF UTAH AND SOUTHWEST WYOMING...Widespread showers and
thunderstorms have redeveloped across much of the airspace and are
expected to persist through this evening. Storms this afternoon
will be capable of producing gusty and erratic outflow winds in
excess of 50 kts, hail, and heavy rainfall that may result in
periods of MVFR to IFR conditions, mainly across northern Utah.

&&

.FIRE WEATHER...Active weather continues today with strong to severe
thunderstorms developing this afternoon across northern and
central Utah with a flash flooding threat also developing this
afternoon across central and southern Utah. Regarding the severe
threat further north, wind gusts in excess of 58-70mph and hail to
around 1" are expected this afternoon with any of the stronger
storms that form. Across southern Utah, monsoonal moisture
continues to surge north bringing an attendant flash flooding
threat to the area through at least Monday. While storm
development across southern Utah may be somewhat muted Sunday
afternoon, Monday appears somewhat concerning regarding rainfall
high rainfall rates and amounts. Regardless, a wetting rain is
expected across the entirety of Utah through early next week.

Following this active patter, a drying and cooling trend will take
place as most showers and thunderstorms appear to remain confined
to the higher terrain at this time. Temperatures will run roughly
5F below seasonal normals with RH approaching normals around mid-
week.

&&

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

PUBLIC...Worster
AVIATION...Verzella
FIRE WEATHER...Worster

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

Preliminary Local Storm Report
National Weather Service Salt Lake City UT
105 PM MDT Sat Aug 29 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1250 PM     Tstm Wnd Gst     1 N Summit              37.84N 112.97W
08/29/2026  M60 MPH          Iron               UT   Mesonet

            Mesonet station PC471 Black Rock.

&&

CRK

Special Weather Statement
National Weather Service Salt Lake City UT
108 PM MDT Sat Aug 29 2026

UTZ115>117-292000-
Western Millard and Juab Counties UT-Central Mountains UT-
Eastern Juab/Millard Counties UT-
108 PM MDT Sat Aug 29 2026

...A strong thunderstorm will impact portions of northeastern Millard
and southeastern Juab Counties through 200 PM MDT
...

At 108 PM MDT, Doppler radar was tracking a strong thunderstorm near
Delta, moving northeast at 40 mph.

HAZARD...Wind gusts of 50 to 55 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Delta, Levan, Oak City, Leamington, Lynndyl, Sutherland, Mills, and
Yuba Lake State Park.

This includes the following highways...
 Interstate 15 between mile markers 196 and 218.
 US Route 6 between mile markers 86 and 109.
 US Route 50 between mile markers 90 and 101.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3978 11203 3978 11201 3946 11175 3921 11253
      3937 11265
TIME...MOT...LOC 1908Z 238DEG 37KT 3933 11246

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH

JCW

Special Weather Statement
National Weather Service Salt Lake City UT
130 PM MDT Sat Aug 29 2026

UTZ113-120-121-292015-
San Rafael Swell UT-Wasatch Plateau/Book Cliffs UT-Castle Country UT-
130 PM MDT Sat Aug 29 2026

...A strong thunderstorm will impact portions of northeastern Emery
and southeastern Carbon Counties through 215 PM MDT
...

At 130 PM MDT, Doppler radar was tracking a strong thunderstorm near
Sunnyside, or 21 miles southeast of Price, moving northeast at 30
mph.

HAZARD...Wind gusts of 50 to 55 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Sunnyside and East Carbon.

This includes US Route 6 between mile markers 258 and 271.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3972 10998 3971 10997 3969 11000 3967 10998
      3961 11003 3954 11003 3953 11005 3950 11002
      3937 11002 3936 11048 3957 11058 3974 10996
TIME...MOT...LOC 1930Z 246DEG 25KT 3948 11044

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH

JCW

Special Weather Statement
National Weather Service Salt Lake City UT
142 PM MDT Sat Aug 29 2026

UTZ115>119-292030-
Sanpete Valley UT-Western Millard and Juab Counties UT-
Sevier Valley UT-Central Mountains UT-
Eastern Juab/Millard Counties UT-
142 PM MDT Sat Aug 29 2026

...Strong thunderstorms will impact portions of southwestern Sanpete,
southeastern Millard, southeastern Juab and north central Sevier
Counties through 230 PM MDT
...

At 142 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 12 miles northwest of Fillmore to 7 miles west
of Kanosh. Movement was northeast at 35 mph.

HAZARD...Wind gusts of 50 to 55 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Fillmore, Scipio, Kanosh, Meadow, Holden, Hatton, Flowell, Greenwood,
Mc Cornick, and Yuba Lake State Park.

This includes the following highways...
 Interstate 15 between mile markers 145 and 201.
 US Route 50 between mile markers 102 and 153.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3954 11179 3888 11197 3874 11261 3920 11253
TIME...MOT...LOC 1942Z 233DEG 32KT 3913 11246 3883 11257

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...55 MPH

JCW

Special Weather Statement
National Weather Service Salt Lake City UT
205 PM MDT Sat Aug 29 2026

UTZ101-102-105-292030-
Salt Lake Valley UT-Tooele and Rush Valleys UT-
Great Salt Lake Desert and Mountains UT-
205 PM MDT Sat Aug 29 2026

...Strong thunderstorms will impact portions of southwestern Salt
Lake, northwestern Utah and east central Tooele Counties through 230
PM MDT
...

At 204 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Skull Valley to 12 miles southwest of
Tooele Army Depot. Movement was northeast at 40 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Tooele, Grantsville, West Jordan, South Jordan, Riverton, Herriman,
Stansbury Park, Tooele Army Depot, Skull Valley, Bingham Canyon Mine,
Stockton, Rush Valley, Erda, Copperton, and Lake Point.

This includes Interstate 80 in Utah between mile markers 84 and 101.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4082 11236 4052 11193 4033 11259 4052 11283
TIME...MOT...LOC 2004Z 241DEG 36KT 4050 11272 4040 11258

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

JCW

Special Weather Statement
National Weather Service Salt Lake City UT
213 PM MDT Sat Aug 29 2026

UTZ101-115-292100-
Western Millard and Juab Counties UT-
Great Salt Lake Desert and Mountains UT-
213 PM MDT Sat Aug 29 2026

...A strong thunderstorm will impact portions of northwestern Juab
and south central Tooele Counties through 300 PM MDT
...

At 212 PM MDT, Doppler radar was tracking a strong thunderstorm near
Partoun, or 44 miles east of Schellbourne, moving northeast at 40
mph.

HAZARD...Wind gusts of 50 to 55 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Partoun, Fish Springs Wildlife Refuge, Dugway Proving Ground Test
Range, Callao, and Trout Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3961 11388 3978 11399 4015 11341 3980 11316
TIME...MOT...LOC 2012Z 241DEG 36KT 3974 11384

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH

JCW