Flash Flood Warning 84, NWS Salt Lake City, UT

208 
WGUS75 KSLC 232355
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
555 PM MDT Sun Aug 23 2026

UTC017-055-240215-
/O.CON.KSLC.FF.W.0084.000000T0000Z-260824T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Wayne UT-
555 PM MDT Sun Aug 23 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM MDT THIS
EVENING FOR NORTHEASTERN GARFIELD AND SOUTHEASTERN WAYNE COUNTIES...

At 555 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain across the Robbers Roost area near the Dirty Devil River,
including Angel, Larry, Alcatraz, and Bull Pasture Canyons down to
Two Step Canyon and Bushwack Boogie Canyon near Lake Powell. Up to
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 creeks, streams, slot
         canyons, and normally dry washes.

Some locations that will experience flash flooding include...
  slot canyons in the Robbers Roost area near the Dirty Devil River,
  including Angel, Larry, Alcatraz, and Bull Pasture Canyons down to
  Two Step Canyon and Bushwack Boogie Canyon.

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.

Remain alert for flooding even in locations not receiving rain. Dry
washes, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.

&&

LAT...LON 3823 11067 3833 11055 3833 11045 3830 11026
      3822 11024 3809 11037 3789 11036 3789 11038
      3788 11040 3788 11042 3812 11042 3820 11050
      3820 11061

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

$$

JAC

119 
WGUS75 KSLC 240212
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
812 PM MDT Sun Aug 23 2026

UTC017-055-240222-
/O.EXP.KSLC.FF.W.0084.000000T0000Z-260824T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Garfield UT-Wayne UT-
812 PM MDT Sun Aug 23 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 815 PM MDT THIS EVENING FOR
NORTHEASTERN GARFIELD AND SOUTHEASTERN WAYNE COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a
threat.

&&

LAT...LON 3823 11067 3833 11055 3833 11045 3830 11026
      3822 11024 3809 11037 3789 11036 3789 11038
      3788 11040 3788 11042 3812 11042 3820 11050
      3820 11061

$$

MPS

Area Forecast Discussion
National Weather Service Salt Lake City UT
1225 PM MDT Sun Aug 23 2026

.KEY MESSAGES, Issued 1151 AM MDT Sun Aug 23 2026...

- A Slight Risk (level 2/5) for severe thunderstorms is outlooked
  this afternoon and evening across much of northern Utah. There
  is a 10% chance of wind gusts in excess of 70 mph with these
  thunderstorms.

- There is a Marginal Risk (level 1/4) for excessive rainfall
  across most of the region through early next week.

- Thunderstorms will continue to impact the higher terrain and
  adjacent valleys through Wednesday. Another round of more
  widespread thunderstorms is increasing in likelihood for Friday
  into early next weekend.

&&

.DISCUSSION, Issued 1151 AM MDT Sun Aug 23 2026...
Strong to severe convection will develop this
afternoon and evening, with the highest probability of significant
impacts (10% chance of wind gusts in excess of 70 mph) across
northern Utah. A Slight Risk (level 2/5) for severe thunderstorms
has been issued for this area by the Storm Prediction Center.
Looking at the set-up, this morning's 12Z sounding at KSLC already
showed almost 1000 J/kg MUCAPE but with a fairly stout amount of
convective inhibition. Latest guidance suggests this effective cap
will erode by 20-21Z, allowing for robust convective development
across northern Utah. Mean HREF SBCAPE indicates a broad area of
values near to above around 1000-1500 J/kg across northern Utah
coincident with deep layer shear around 25-30 kts.

Weak surface convergence associated with a shortwave trough
passing to the north may help to organize convection into a
quasi-linear feature, though per typical in terrain, this is
difficult to discern in model fields. The latest few HRRR runs do
show a signature of an organized line of very strong outflow
shifting across the west desert and into the Wasatch Front
between 21Z and 01Z and then continuing to be quite strong into
the Uinta County, WY area by 02-03Z. Peak wind gusts in these runs
have increased to 55kts, but given the very steep lapse rates,
relatively high instability for the Great Basin, modest deep layer
shear and low LCLs, expect storms to be able to attain cold
pool/shear balance. Saturday's convective outflow peak was 80 mph
near Grassey on I-80...cant rule out a repeat somewhere along this
area of outflow winds this afternoon and evening.

For areas south of I-70, the heavy rain threat continues. While
HREF peak 1 hour rates have decreased over Saturday's values, net
available moisture has only decreased subtly. Expect any stronger
thunderstorms, especially those tied to terrain features and/or
training, to be capable of rainfall rates in excess of 0.50 inches
per hour. Will need to monitor for flash flood threat across much
of this area...especially for slot canyons, normally dry washes
and recent burn scars.

With the previously mentioned upper level trough passing to the
east Monday, the best chance for strong outflow winds will shift
to mainly the Utah/Idaho border region. Convection will become
increasingly tied to the higher terrain and adjacent valleys
through Wednesday...with only isolated convection expected
Thursday as high pressure brings a drying trend to most
locations.

However...with the tropical eastern Pacific remaining quite
active, at least a portion of ensemble members indicate the next
trough approaching the Pacific Northwest will assist in shifting
remnant tropical moisture into the Great Basin by Friday. This is
something to watch moving forward.

&&

.AVIATION, Issued 1151 AM MDT Sun Aug 23 2026...
KSLC, Issued 1151 AM MDT Sun Aug 23 2026...
A few thunderstorms will begin to develop over
the Salt Lake Valley after 20z or so, resulting in low confidence
in wind direction with any outflow winds. After 00z, a more
organized cluster of thunderstorms is looking more likely to
impact the terminal, bringing a chance for lightning, MVFR VIS due
to moderate- heavy rain, and gusty outflow winds. Winds could
even exceed 50kts out of the west (or become variable) as this
line moves through. There is still some uncertainty with the
timing of this cluster. Weaker showers will linger in the area
until 07z or so, with breezy easterly winds slowly becoming
lighter out of the southeast.

REST OF UTAH AND SOUTHWEST WYOMING...Scattered showers and
thunderstorms will continue to develop this afternoon across UT
and southwest WY, with lower chances at KCDC and KSGU. Any showers
will be capable of producing strong and erratic outflow winds,
with the strongest winds across northern UT/southwest WY. Here,
winds are more likely to briefly exceed 50kts or even 65kts near
the strongest storms. A more organized cluster of thunderstorms
will sweep through KTVY-KSLC-KOGD-KEVW between roughly 00-05z,
which may produce very strong winds, MVFR VIS due to moderate-
heavy rain, and lightning. There is still uncertainty with exact
timing of this cluster.

&&

.FIRE WEATHER...High pressure will remain across the Four-Corners
region through the next week. As an upper level low crosses
southern Canada into the northern Intermountain Region through
Monday, sufficient forcing for thunderstorms will continue. As a
result, strong to severe thunderstorms will impact much of
northern Utah this afternoon and evening. The most significant
threat will be strong outflow winds in excess of 60 mph, mainly
north of I-70. For locations south of I-70, strong outflow winds
up to 50 mph and very heavy rain will be the primary impacts from
thunderstorms.

Additional strong thunderstorms will develop Monday afternoon and
evening, but the threat of outflows in excess of 50 mph will
remain closer to the Utah/Idaho border. As high pressure builds
north and east in the wake of the upper level low Tuesday,
thunderstorms will become more confined to the higher terrain and
adjacent valleys through Thursday. A net drying trend will
continue, with most valleys see humidities fall to critical levels
by midweek. Another round of thunderstorms may impact more of the
state as early as Friday as another low pressure area impacts the
Pacific Northwest and pulls moisture from the tropical Pacific
northeastward into the Great Basin.

&&

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

PUBLIC...
AVIATION...
FIRE WEATHER...Kruse

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

Special Weather Statement
National Weather Service Salt Lake City UT
153 PM MDT Sun Aug 23 2026

UTZ113-114-232045-
Western Uinta Basin UT-Wasatch Plateau/Book Cliffs UT-
153 PM MDT Sun Aug 23 2026

...A strong thunderstorm will impact portions of southeastern
Duchesne County through 245 PM MDT
...

At 152 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles south of Duchesne, moving northeast at 5 mph.

HAZARD...Wind gusts up to 50 mph and pea 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...
Bridgeland and Arcadia.

This includes US Route 40 between mile markers 88 and 101.

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 3994 11039 4010 11049 4028 11019 4001 11003
TIME...MOT...LOC 1952Z 244DEG 6KT 4005 11037

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

JCW

Special Weather Statement
National Weather Service Salt Lake City UT
215 PM MDT Sun Aug 23 2026

UTZ130-232100-
Western Canyonlands UT-
215 PM MDT Sun Aug 23 2026

...A strong thunderstorm will impact portions of northern Garfield
and south central Wayne Counties through 300 PM MDT
...

At 215 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles south of Hanksville, moving east at 15 mph.

HAZARD...Wind gusts up to 50 mph and pea 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.

This storm will remain over mainly rural areas of northern Garfield
and south central Wayne Counties.

This includes Utah Route 95 between mile markers 4 and 16.

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 3818 11084 3831 11083 3836 11040 3811 11040
TIME...MOT...LOC 2015Z 271DEG 14KT 3826 11074

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

JCW

Special Weather Statement
National Weather Service Salt Lake City UT
231 PM MDT Sun Aug 23 2026

UTZ101-232115-
Great Salt Lake Desert and Mountains UT-
231 PM MDT Sun Aug 23 2026

...A strong thunderstorm will impact portions of northwestern Box
Elder County through 315 PM MDT
...

At 230 PM MDT, Doppler radar was tracking a strong thunderstorm 24
miles north of Montello, moving east at 25 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...
Grouse Creek and Etna.

This includes Utah Route 30 between mile markers 32 and 36.

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.

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 4188 11365 4160 11352 4155 11404 4179 11404
TIME...MOT...LOC 2030Z 251DEG 20KT 4160 11403

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

JCW

Preliminary Local Storm Report
National Weather Service Salt Lake City UT
246 PM MDT Sun Aug 23 2026

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

0235 PM     Flash Flood      2 SW Capitol Reef Np    38.26N 111.22W
08/23/2026                   Wayne              UT   Park/Forest Srvc

            Grand Wash is flashing. Time estimated.

&&

CRK

Special Weather Statement
National Weather Service Salt Lake City UT
307 PM MDT Sun Aug 23 2026

UTZ101-232145-
Great Salt Lake Desert and Mountains UT-
307 PM MDT Sun Aug 23 2026

...A strong thunderstorm will impact portions of northwestern Box
Elder County through 345 PM MDT
...

At 307 PM MDT, Doppler radar was tracking a strong thunderstorm 16
miles south of Oakley Reservoir, moving northeast at 20 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.

This storm will remain over mainly rural areas of northwestern Box
Elder County.

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.

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 4199 11356 4182 11401 4187 11405 4199 11404
TIME...MOT...LOC 2107Z 239DEG 17KT 4193 11398

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

JCW

Special Weather Statement
National Weather Service Salt Lake City UT
319 PM MDT Sun Aug 23 2026

UTZ101-105-106-111-232200-
Salt Lake Valley UT-Utah Valley UT-
Great Salt Lake Desert and Mountains UT-Wasatch Mountains South of I-
80 UT-
319 PM MDT Sun Aug 23 2026

...A strong thunderstorm will impact portions of southwestern Salt
Lake and northwestern Utah Counties through 400 PM MDT
...

At 319 PM MDT, Doppler radar was tracking a strong thunderstorm over
Herriman, or 13 miles southwest of Sandy, moving northeast at 15 mph.

HAZARD...Wind gusts up to 50 mph and pea 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...
Sandy, Murray, West Jordan, South Jordan, Lehi, Draper, Riverton,
Midvale, Herriman, Bluffdale, Camp Williams, and Bingham Canyon Mine.

This includes Interstate 15 between mile markers 286 and 298.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4041 11212 4049 11218 4064 11191 4046 11180
TIME...MOT...LOC 2119Z 245DEG 11KT 4048 11207

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

JCW