Flash Flood Warning 37, NWS Salt Lake City, UT

225 
WGUS75 KSLC 212357
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
557 PM MDT Tue Jul 21 2026

UTC041-220007-
/O.EXP.KSLC.FF.W.0037.000000T0000Z-260722T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sevier UT-
557 PM MDT Tue Jul 21 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING FOR 
CENTRAL SEVIER COUNTY...SPECIFICALLY FOR LOWER SIGURD CANYON...

Flood waters have receded. Light to at times moderate rain remains 
over the area, but the heavy rain has ended. Flooding is no longer 
expected to pose a threat. Please continue to heed remaining road 
closures.

A Flood Watch remains in effect until 300 AM MDT Wednesday for 
portions of central, southern, and southwest Utah.

&&

LAT...LON 3873 11187 3876 11194 3881 11196 3885 11199
      3887 11196 3879 11180

$$

GM

Area Forecast Discussion
National Weather Service Salt Lake City UT
116 PM MDT Tue Jul 21 2026

.KEY MESSAGES...

- Scattered showers and thunderstorms are expected to develop across
portions of central, southern, northeast UT, and southwest WY each
afternoon within this forecast as monsoonal moisture continues
making its way north.

- The risk for flash flooding increases statewide today and
tomorrow, with both days featuring much of UT outlined within a
slight risk (2/4) of exceeding flash flood guidance.

- The potential for severe weather across UT this afternoon appears
to be increasing. Severe wind gusts (>58mph) appears to be the main
threat, particularly across southeast UT later this evening.

&&

.DISCUSSION... A stronger monsoonal push is forecast to occur across
much of UT today as robust mid-level moisture returns to the region.
Currently, subsidence has built in across much of southern and
central UT following this mornings thunderstorms. This will serve to
offset convective initiation until around 1400-1500, enabling the
environment to destabilize further with CAPE general ranging from
1000-1500J/kg statewide, though CAPE ~2000J/kg appears possible
closer to southwest UT. With PWATs generally 1.2" or greater in
place across much of UT (0.8-1.0" PWAT anomalies for this time of
year), thunderstorms today are forecast to be efficient and heavy
rainmakers.

Of note, mid-level southwesterly flow will see an increase to around
20-30kts with multiple embedded shortwave perturbations providing
enough forcing for ascent. This will support multiple rounds of
storms this afternoon and through the evening hours as well as
storms propagating off terrain, which will be the opposite of what
we have been seeing through much of this recent monsoonal pattern
with storms remaining anchored to terrain. Typically, enhanced flow
would limit the flash flooding threat areawide as storms would not
remain over problematic basins and burn scars long enough to produce
flooding. However, given the efficient rainmaking status of these
storms with multiple rounds expected, the flash flooding threat
continues to exist, particularly if redevelopment occurs across a
single area in a short period of time. Additionally, the presence of
bulk shear to around 35kts supports organized storms sustaining
themselves for longer. Additionally, shear on this magnitude is
supportive of a supercell or two, particularly across southeast UT
where shear is greatest, which would increase the threat of flash
flooding further.

Regarding severe weather this afternoon and evening, the Storm
Prediction Center has placed much of UT within a Marginal Risk (1/5)
for severe weather with an emphasis on severe wind gusts in excess
of 58mph. Across most of UT, primarily western and northern, DCAPE
potentially in excess of 1500J/kg will exist this afternoon as
storms begin to develop ahead of the initial shortwave. This will
yield a scattered threat for strong to severe gusts through much of
the afternoon today as the enhanced flow aloft finds a better medium
amidst the higher DCAPE to mix down to the surface with.

Later this evening across southeast UT where forecast confidence in
wind shear to around 35kts is greatest, a westward propagating MCS
is forecast to move into the area from southwestern CO. Some mid-
level flow enhancement is possible around the time of initiation (to
around 30-40kts) with 1600-1800J/kg of DCAPE in place. This supports
an organized severe wind threat with a few severe gusts potentially
reaching as high as 70mph this evening across areas such as Glen
Canyon/Lake Powell and adjacent areas within eastern Wayne,
Garfield, and Kane counties.

A similar setup for flash flooding exists on Wednesday, though storm
motions are forecast to be somewhat slower as mid-level flow sees a
slight decrease. Fortunately, this will reduce wind shear somewhat
as well potentially reducing the longevity of storms. However, with
deep moisture remaining in place and weaker flow aloft, efficient
rainmaking thunderstorms remain expected with a slightly higher
chance of storms remaining anchored to terrain tomorrow.

From Thursday on, mid-level moisture will see a slight decrease
areawide. However, with ridging remaining overhead, daily chances
for thunderstorms will continue across much of the state and favor
terrain as steering flow aloft gradually weakens. The forecast
becomes somewhat muddied as we enter the weekend with global suites
continuing to disagree on moisture scouring, though the broader
pattern in place continues to support at least some continuation of
the monsoonal pattern into at least Saturday.

&&

.AVIATION...

KSLC...Mostly VFR conditions will persist for the KSLC terminal
through the period. Winds this morning will be light southerly
transitioning to light northerly this afternoon. Convection develops
this afternoon across northern Utah with ~30% chance of convection
moving over the terminal. Convection could switch us to predominate
southerly quite a bit earlier than usual. Lightning, gusty and
erratic winds, and brief heavy rain will be the primary concern with
this convection. This convection will remain on and off through the
evening and potentially overnight, albeit weaker overnight.

REST OF UTAH AND SOUTHWEST WYOMING...Mostly VFR conditions will
persist through the period for the area. Monsoon moisture remains in
place with a lull in activity through ~2pm before convection begins
to develop areawide. Storms will primarily produce lightning, gusty
and erratic winds, and brief heavy rain. This activity will continue
through the evening with storms weakening, but persisting to some
capacity, through the overnight.

&&

.FIRE WEATHER...Monsoonal moisture remains in place throughout UT
increasing humidities and chances for showers / thunderstorms across
the state, helping moderating fire weather conditions statewide.
Chances for showers and thunderstorms see a notable uptick across
the entirety of the state today as a stronger monsoonal push arrives
this afternoon. Expect showers and thunderstorms to develop along
higher terrain parallel to I-15 each afternoon over the next several
days around 1200-1400 with gusty outflow winds, heavy rainfall, and
lightning. Some storms this afternoon, particularly across northwest
UT and southeast UT may feature severe wind gusts in excess of
58mph. Winds will generally remain light terrain driven
/ diurnal over the next several days other than thunderstorm
influenced winds and gusts.
&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...Flood Watch through late tonight for UTZ113-115>131.

WY...None.
&&

PUBLIC...Worster
AVIATION...Mahan
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
315 PM MDT Tue Jul 21 2026

UTZ116>119-212200-
Sanpete Valley UT-Sevier Valley UT-Central Mountains UT-
Eastern Juab/Millard Counties UT-
315 PM MDT Tue Jul 21 2026

...Strong thunderstorms will impact portions of southwestern Sanpete,
east central Millard and north central Sevier Counties through 400 PM
MDT
...

At 315 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Salina to near Annabella. Movement was
northwest at 15 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...
Richfield, Salina, Annabella, Centerfield, Aurora, Redmond, Glenwood,
Sigurd, and Axtell.

This includes the following highways...
 Interstate 70 between mile markers 34 and 67.
 US Route 50 between mile markers 141 and 158.
 US Route 89 between mile markers 226 and 238.
 Utah Route 24 between mile markers 16 and 19.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3922 11189 3886 11240 3864 11202 3890 11166
TIME...MOT...LOC 2115Z 138DEG 13KT 3890 11180 3873 11203

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

JCW

Special Weather Statement
National Weather Service Salt Lake City UT
350 PM MDT Tue Jul 21 2026

UTZ115-117-212215-
Western Millard and Juab Counties UT-Central Mountains UT-
350 PM MDT Tue Jul 21 2026

...A strong thunderstorm will impact portions of south central
Millard County through 415 PM MDT
...

At 350 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Cove Fort, or 22 miles northeast of Milford, moving
northwest at 10 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.

This storm will remain over mainly rural areas of south central
Millard 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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

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 3866 11302 3886 11279 3877 11270 3875 11271
      3874 11267 3863 11261 3857 11269 3857 11280
TIME...MOT...LOC 2150Z 131DEG 8KT 3862 11272

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

JCW

Special Weather Statement
National Weather Service Salt Lake City UT
400 PM MDT Tue Jul 21 2026

UTZ113-120-212230-
Wasatch Plateau/Book Cliffs UT-Castle Country UT-
400 PM MDT Tue Jul 21 2026

...A strong thunderstorm will impact portions of northeastern Carbon
and southern Duchesne Counties through 430 PM MDT
...

At 400 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles northeast of Sunnyside, or 28 miles east of Price. This storm
was nearly stationary.

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

SOURCE...Radar indicated.

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

This storm will remain over mainly rural areas of northeastern Carbon
and southern Duchesne Counties.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3972 11019 3958 11024 3959 11052 3985 11040
TIME...MOT...LOC 2200Z 110DEG 3KT 3965 11027

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

JCW

Preliminary Local Storm Report
National Weather Service Salt Lake City UT
418 PM MDT Tue Jul 21 2026

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

0341 PM     Flash Flood      2 SE Sigurd             38.83N 111.94W
07/21/2026                   Sevier             UT   Dept of Highways

            UDOT reports debris on SR-24 near MP12 due
            to flash flooding, resulting in a road
            closure.

&&

Special Weather Statement
National Weather Service Salt Lake City UT
422 PM MDT Tue Jul 21 2026

UTZ108-110-112-212300-
Wasatch Back UT-Western Uinta Mountains UT-Wasatch Mountains I-
80 North UT-
422 PM MDT Tue Jul 21 2026

...A strong thunderstorm will impact portions of east central Morgan
and northwestern Summit Counties through 500 PM MDT
...

At 422 PM MDT, Doppler radar was tracking a strong thunderstorm over
Coalville, moving north at 10 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...
Coalville, Henefer, Emory, Croydon, Echo, and Echo Reservoir.

This includes the following highways...
 Interstate 84 between mile markers 111 and 119.
 Interstate 80 in Utah between mile markers 164 and 177.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

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 4092 11132 4092 11150 4118 11160 4119 11125
TIME...MOT...LOC 2222Z 176DEG 11KT 4096 11141

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

JCW

Special Weather Statement
National Weather Service Salt Lake City UT
426 PM MDT Tue Jul 21 2026

UTZ115-212315-
Western Millard and Juab Counties UT-
426 PM MDT Tue Jul 21 2026

...Strong thunderstorms will impact portions of central Millard
County through 515 PM MDT
...

At 426 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 19 miles southwest of Delta to 33 miles north
of Milford. Movement was northwest at 15 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.

These storms will remain over mainly rural areas of central Millard
County.

This includes US Route 6 between mile markers 35 and 77.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

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 3944 11281 3900 11352 3880 11312 3908 11268
TIME...MOT...LOC 2226Z 145DEG 14KT 3909 11273 3887 11311

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

JCW