Alert archive / Utah / Flash Flood Warnings in 2026

Flash Flood Warning 108, NWS Salt Lake City, UT

August 31, 2026Garfield County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 31, 2026, 12:20 PM MDT for Garfield County, Utah. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 31, 2026, 12:20 PM MDT (18:20 UTC)
Expired: Aug 31, 2026, 3:15 PM MDT
In force: 3 hr
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Garfield County, UT

The radar

The Cedar City radar (KICX), 128 km from the middle of the area, began a volume at 18:22 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 6.3 hours before the alert went out and 328 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 39 J/kg
Mixed-layer CIN: -292 J/kg
Mixed-layer LCL: 1883 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Salt Lake City, UT wrote its last area forecast discussion before this flash flood warning went out at Aug 31, 12:12 PM MDT, 8 minutes earlier.

Area forecast discussion, Aug 31, 12:12 PM MDT, 8 minutes before

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In the hours before

Local storm report, Aug 31, 11:09 AM MDT, 1 hour 11 minutes before

Preliminary Local Storm Report
National Weather Service Salt Lake City UT
1109 AM MDT Mon Aug 31 2026

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

1025 AM     Flash Flood      2 NE Escalante          37.78N 111.57W
08/31/2026                   Garfield           UT   Official NWS Obs

            River Gauge on the Escalante at Escalante
            indicates a 433 cfs flood wave hit the gauge
            at 1025. The flow was still increasing.

&&

CRK

Special weather statement, Aug 31, 11:21 AM MDT, 59 minutes before

Special Weather Statement
National Weather Service Salt Lake City UT
1121 AM MDT Mon Aug 31 2026

UTZ124-125-311800-
Southern Mountains UT-Zion National Park UT-
1121 AM MDT Mon Aug 31 2026

...A strong thunderstorm will impact portions of east central
Washington, northwestern Kane and south central Iron Counties through
NOON MDT
...

At 1121 AM MDT, Doppler radar was tracking a strong thunderstorm near
Zion National Park, moving northeast at 15 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...
Zion National Park and Cedar Breaks National Monument.

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 3731 11299 3738 11312 3767 11289 3750 11263
TIME...MOT...LOC 1721Z 219DEG 13KT 3739 11298

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

CRK

Special weather statement, Aug 31, 11:27 AM MDT, 53 minutes before

Special Weather Statement
National Weather Service Salt Lake City UT
1127 AM MDT Mon Aug 31 2026

UTZ123-125-128-311815-
South Central Utah UT-Southern Mountains UT-
Lower Washington County UT-
1127 AM MDT Mon Aug 31 2026

...A strong thunderstorm will impact portions of south central
Washington County through 1215 PM MDT
...

At 1127 AM MDT, Doppler radar was tracking a strong thunderstorm near
St George, or 16 miles east of Virgin River Gorge, moving northeast
at 15 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...
St George, Washington, Hurricane, Sand Hollow State Park, Quail Creek
State Park, and Bloomington.

This includes the following highways...
 Interstate 15 between mile markers 1 and 20.
 Utah Route 18 between mile markers 0 and 2.

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 3727 11354 3715 11323 3700 11336 3700 11363
TIME...MOT...LOC 1727Z 205DEG 11KT 3700 11352

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

CRK

Special weather statement, Aug 31, 12:06 PM MDT, 14 minutes before

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Special weather statement, Aug 31, 12:07 PM MDT, 13 minutes before

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Special weather statement, Aug 31, 12:16 PM MDT, 4 minutes before

Special Weather Statement
National Weather Service Salt Lake City UT
1216 PM MDT Mon Aug 31 2026

UTZ125-126-311900-
Upper Sevier River Valleys UT-Southern Mountains UT-
1216 PM MDT Mon Aug 31 2026

...A strong thunderstorm will impact portions of southwestern
Garfield, northwestern Kane and southeastern Iron Counties through
100 PM MDT
...

At 1216 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles southeast of Cedar Breaks National Monument, or 20 miles
northeast of Zion National Park, moving northeast at 15 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...
Hatch, Cedar Breaks National Monument, Panguitch Lake, and Long
Valley Junction.

This includes US Route 89 between mile markers 104 and 116.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3740 11276 3760 11292 3786 11259 3755 11234
TIME...MOT...LOC 1816Z 239DEG 15KT 3752 11276

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

CRK

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 30, 6:23 PM MDT	Special Weather Statement	SLC	Duchesne	52 min
Aug 30, 7:07 PM MDT	Special Weather Statement	SLC	Duchesne	38 min
Aug 31, 6:37 AM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane	4 hr
Aug 31, 9:50 AM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield	3 hr
Aug 31, 10:19 AM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Wayne	3 hr
Aug 31, 10:46 AM MDT	Flash Flood Warning Considerable damage threat	SLC	Emery, Wayne	4 hr
Aug 31, 10:59 AM MDT	Special Weather Statement	SLC	Iron	46 min
Aug 31, 11:04 AM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield, Kane	14 hr
Aug 31, 11:16 AM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane, Washington	5 hr
Aug 31, 11:21 AM MDT	Special Weather Statement	SLC		39 min
Aug 31, 11:27 AM MDT	Special Weather Statement	SLC	Washington	48 min
Aug 31, 11:47 AM MDT	Areal Flood Advisory	SLC	Washington	3 hr
Aug 31, 11:51 AM MDT	Severe Thunderstorm Warning	SLC	Garfield, Iron, Kane	24 min
Aug 31, 12:04 PM MDT	Severe Thunderstorm Warning	SLC	Washington	41 min
Aug 31, 12:06 PM MDT	Special Weather Statement	SLC	Washington	39 min
Aug 31, 12:07 PM MDT	Special Weather Statement	SLC	Millard	38 min
Aug 31, 12:16 PM MDT	Special Weather Statement	SLC		44 min
Aug 31, 1:00 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane, Washington	3 hr
Aug 31, 1:05 PM MDT	Special Weather Statement	SLC	Kane	40 min
Aug 31, 1:10 PM MDT	Special Weather Statement	SLC		50 min
Aug 31, 1:16 PM MDT	Special Weather Statement	SLC	Kane	44 min
Aug 31, 1:43 PM MDT	Special Weather Statement	SLC	Beaver	47 min
Aug 31, 1:45 PM MDT	Severe Thunderstorm Warning	SLC	Juab, Millard	45 min
Aug 31, 1:48 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Garfield	10 hr
Aug 31, 1:52 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Piute	3 hr
Aug 31, 2:04 PM MDT	Special Weather Statement	SLC		41 min
Aug 31, 2:22 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Washington	3 hr
Aug 31, 2:30 PM MDT	Special Weather Statement	SLC	Iron	45 min
Aug 31, 2:30 PM MDT	Severe Thunderstorm Warning	SLC	Juab, Millard	45 min
Aug 31, 2:40 PM MDT	Special Weather Statement	SLC	Salt Lake	35 min
Aug 31, 3:11 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Piute	3 hr
Aug 31, 3:13 PM MDT	Special Weather Statement	SLC	Juab	32 min
Aug 31, 3:39 PM MDT	Areal Flood Advisory	SLC	Garfield	3 hr
Aug 31, 3:41 PM MDT	River Flood Advisory	SLC	Washington	8 hr
Aug 31, 3:58 PM MDT	Flash Flood Warning Considerable damage threat	SLC	Kane, Washington	9 hr
Aug 31, 4:39 PM MDT	Special Weather Statement	SLC	Salt Lake	51 min
Aug 31, 4:57 PM MDT	Special Weather Statement	SLC	Wayne	33 min
Aug 31, 5:36 PM MDT	Special Weather Statement	SLC	Davis, Weber	24 min
Aug 31, 5:41 PM MDT	Special Weather Statement	SLC	Tooele	34 min
Aug 31, 5:53 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Tooele	37 min

Nearby

Flash Flood Warnings in Utah, 2026 Every flash flood warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.