Severe Thunderstorm Warning 76, NWS Salt Lake City, UT

762 
WWUS55 KSLC 240023
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
623 PM MDT Sun Aug 23 2026

UTC003-240100-
/O.CON.KSLC.SV.W.0076.000000T0000Z-260824T0100Z/
Box Elder UT-
623 PM MDT Sun Aug 23 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM MDT
FOR CENTRAL BOX ELDER COUNTY...

At 623 PM MDT, severe thunderstorms were located along a line
extending from 13 miles southeast of Park Valley to 25 miles
northwest of Utah Test and Training Range North, moving east at 25
mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Great Salt Lake North of the Causeway and Locomotive Springs.

This includes Interstate 84 between mile markers 13 and 19.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4194 11247 4130 11304 4125 11355 4185 11303
TIME...MOT...LOC 0023Z 270DEG 23KT 4166 11319 4135 11346 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JCW

808 
WWUS55 KSLC 240045
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
645 PM MDT Sun Aug 23 2026

UTC003-240100-
/O.CON.KSLC.SV.W.0076.000000T0000Z-260824T0100Z/
Box Elder UT-
645 PM MDT Sun Aug 23 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM MDT
FOR CENTRAL BOX ELDER COUNTY...

At 645 PM MDT, severe thunderstorms were located along a line
extending from 17 miles southeast of Park Valley to 24 miles north of
Utah Test and Training Range North, moving east at 25 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Great Salt Lake North of the Causeway and Locomotive Springs.

This includes Interstate 84 between mile markers 13 and 19.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4194 11247 4136 11299 4142 11340 4185 11303
TIME...MOT...LOC 0045Z 270DEG 23KT 4168 11306 4137 11333 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JCW

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
449 PM MDT Sun Aug 23 2026

UTZ101-232330-
Great Salt Lake Desert and Mountains UT-
449 PM MDT Sun Aug 23 2026

...A strong thunderstorm will impact portions of west central Box
Elder County through 530 PM MDT
...

At 449 PM MDT, Doppler radar was tracking a strong thunderstorm near
Montello, moving northeast at 15 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...
Lucin.

This includes Utah Route 30 between mile markers 1 and 12.

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.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
northern Utah.

&&

LAT...LON 4139 11404 4150 11388 4126 11370 4115 11404
TIME...MOT...LOC 2249Z 239DEG 14KT 4126 11409

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

JCW

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

UTZ101-103-240000-
Eastern Box Elder County UT-Great Salt Lake Desert and Mountains UT-
520 PM MDT Sun Aug 23 2026

...A strong thunderstorm will impact portions of north central Box
Elder County through 600 PM MDT
...

At 520 PM MDT, Doppler radar was tracking a strong thunderstorm 11
miles north of Park Valley, or 23 miles south of Malta, moving east
at 35 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...
Snowville and Curlew Junction.

This includes the following highways...
 Interstate 84 between mile markers 1 and 7.
 Utah Route 30 between mile markers 71 and 90.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
northern Utah.

&&

LAT...LON 4189 11270 4193 11336 4199 11337 4200 11271
TIME...MOT...LOC 2320Z 268DEG 29KT 4198 11326

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

JCW

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

UTZ101-240015-
Great Salt Lake Desert and Mountains UT-
534 PM MDT Sun Aug 23 2026

...Strong thunderstorms will impact portions of northwestern Box
Elder County through 615 PM MDT
...

At 534 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 10 miles southwest of Park Valley to 13 miles
east of Montello. Movement was northeast at 25 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...
Park Valley.

This includes Utah Route 30 between mile markers 15 and 39, and
between mile markers 55 and 69.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
northern Utah.

&&

LAT...LON 4190 11295 4127 11348 4121 11397 4173 11351
      4190 11318
TIME...MOT...LOC 2334Z 234DEG 24KT 4170 11347 4123 11393

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

JCW

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

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

0525 PM     Tstm Wnd Gst     10 W Knolls             40.73N 113.47W
08/23/2026  M66 MPH          Tooele             UT   Mesonet

            Mesonet station DPG17 Interstate 80.

&&

CRK

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

UTZ101-240030-
Great Salt Lake Desert and Mountains UT-
539 PM MDT Sun Aug 23 2026

...Strong thunderstorms will impact portions of central Tooele County
through 630 PM MDT
...

At 539 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles northwest of Clive to 13 miles west of
Dugway Proving Ground Test Range. Movement was east at 35 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...
Delle, Dugway Proving Ground Test Range, Knolls, Clive, Great Salt
Lake South of the Causeway, and Utah Test and Training Range South.

This includes Interstate 80 in Utah between mile markers 39 and 75.

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.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
northern Utah.

&&

LAT...LON 4105 11248 4019 11303 4008 11366 4082 11326
TIME...MOT...LOC 2339Z 249DEG 29KT 4076 11315 4016 11353

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

JCW

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

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

0530 PM     Tstm Wnd Gst     Knolls                  40.73N 113.28W
08/23/2026  M62 MPH          Tooele             UT   Mesonet

            Mesonet station UTKNO I-80 at MP 40 Knolls.

&&

CRK