Flash Flood Warning 88, NWS Salt Lake City, UT

290 
WGUS75 KSLC 292120
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
320 PM MDT Sat Aug 29 2026

UTC015-055-292230-
/O.CON.KSLC.FF.W.0088.000000T0000Z-260829T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emery UT-Wayne UT-
320 PM MDT Sat Aug 29 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM MDT THIS
AFTERNOON FOR SOUTHERN EMERY AND NORTH CENTRAL WAYNE COUNTIES...

At 320 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain across portions of the San Rafael Swell including Goblin Valley,
Little Wildhorse, Crack, Chute, Ding, Dang, Muddy Creek and all slot
canyons and dry washes in and near southern Emery and north central
Wayne County. Between 0.25 and 0.75 inches of rain have fallen. Flash
flooding is ongoing or expected to begin shortly.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Radar indicated.

IMPACT...Life threatening flash flooding of slot canyons, normally
         dry washes, streams, creeks and rivers.

Some locations that will experience flash flooding include...
  Goblin Valley, Little Wildhorse, Crack, Chute, Ding, Dang, Muddy
  Creek and all slot canyons and dry washes in and near southern
  Emery and north central Wayne County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Move to higher ground now. Act quickly to protect your life.

&&

LAT...LON 3850 11112 3864 11120 3891 11056 3881 11027
      3853 11069 3843 11108

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

JAC

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

Special Weather Statement
National Weather Service Salt Lake City UT
1216 PM MDT Sat Aug 29 2026

UTZ117-120-291900-
Castle Country UT-Central Mountains UT-
1216 PM MDT Sat Aug 29 2026

...A strong thunderstorm will impact portions of east central Sanpete
and west central Emery Counties through 100 PM MDT
...

At 1216 PM MDT, Doppler radar was tracking a strong thunderstorm 10
miles northwest of Clawson, or 21 miles east of Manti, moving
northeast at 10 mph.

HAZARD...Wind gusts of 50 to 55 mph and nickel 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...
Castle Dale and Orangeville.

This includes Utah Route 10 between mile markers 36 and 45.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3914 11131 3929 11140 3947 11113 3946 11108
      3921 11090
TIME...MOT...LOC 1816Z 240DEG 10KT 3923 11124

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...55 MPH

CRK

Special Weather Statement
National Weather Service Salt Lake City UT
1256 PM MDT Sat Aug 29 2026

UTZ115-116-291945-
Western Millard and Juab Counties UT-
Eastern Juab/Millard Counties UT-
1256 PM MDT Sat Aug 29 2026

...A strong thunderstorm will impact portions of east central Millard
County through 145 PM MDT
...

At 1255 PM MDT, Doppler radar was tracking a strong thunderstorm 24
miles west of Kanosh, or 28 miles west of Fillmore, 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...
Fillmore and Flowell.

This includes the following highways...
 Interstate 15 between mile markers 166 and 169.
 US Route 50 between mile markers 107 and 108.

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 3881 11295 3895 11307 3934 11253 3899 11228
TIME...MOT...LOC 1855Z 245DEG 35KT 3892 11287

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

JCW

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

UTZ117-125-126-129-291945-
Capitol Reef National Park and Vicinity UT-
Upper Sevier River Valleys UT-Southern Mountains UT-
Central Mountains UT-
103 PM MDT Sat Aug 29 2026

...A strong thunderstorm will impact portions of southeastern Piute,
northwestern Wayne and southern Sevier Counties through 145 PM MDT
...

At 103 PM MDT, Doppler radar was tracking a strong thunderstorm 10
miles north of Antimony, or 15 miles east of Junction, moving
northeast at 30 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Loa, Bicknell, Torrey, Teasdale, Lyman, Angle, and Fremont.

This includes Utah Route 24 between mile markers 44 and 69.

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 3815 11199 3832 11208 3855 11152 3830 11139
TIME...MOT...LOC 1903Z 247DEG 26KT 3826 11194

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

JCW

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