Alert archive / Utah / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 13, NWS Grand Junction, CO

August 26, 2025San Juan County, Utah

NWS Grand Junction, CO issued this severe thunderstorm warning at Aug 26, 2025, 3:07 PM MDT for San Juan County, Utah. It was in force for 23 min. 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 26, 2025, 3:07 PM MDT (21:07 UTC)
Expired: Aug 26, 2025, 3:30 PM MDT
In force: 23 min
Issued by: NWS Grand Junction, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County San Juan County, UT

The radar

The Grand Junction radar (KGJX), 212 km from the middle of the area, began a volume at 21:07 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 9.1 hours before the alert went out and 321 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: 2 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1305 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Grand Junction, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 26, 2:53 PM MDT, 14 minutes earlier.

Area forecast discussion, Aug 26, 2:53 PM MDT, 14 minutes before

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Hazardous weather outlook, Aug 26, 4:05 AM MDT, 11 hours 2 minutes before

Hazardous Weather Outlook
National Weather Service Grand Junction CO
405 AM MDT Tue Aug 26 2025

COZ001>014-017>023-UTZ022>025-027>029-271015-
Lower Yampa River Basin-Central Yampa River Basin-
Roan and Tavaputs Plateaus-Elkhead and Park Mountains-
Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor-
Central Colorado River Basin-Grand and Battlement Mesas-
Gore and Elk Mountains/Central Mountain Valleys-
Central Gunnison and Uncompahgre River Basin-
West Elk and Sawatch Mountains-Flat Tops-Upper Gunnison River Valley-
Uncompahgre Plateau and Dallas Divide-Northwest San Juan Mountains-
Southwest San Juan Mountains-Paradox Valley/Lower Dolores River-
Four Corners/Upper Dolores River-Animas River Basin-
San Juan River Basin-Southeast Utah-Eastern Uinta Mountains-
Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat-
La Sal and Abajo Mountains-Canyonlands/Natural Bridges-
405 AM MDT Tue Aug 26 2025

This Hazardous Weather Outlook is for northwest Colorado, southwest
Colorado, west central Colorado, east central Utah, northeast Utah
and southeast Utah.

.DAY ONE...Today and tonight.

Widespread convection is expected this afternoon. Storms will be
capable of producing moderate to heavy rainfall, small hail, gusty
winds, and frequent lightning. Flash flooding and debris flows are
possible in sensitive areas, such as slot canyons and recent burn
scars. A Flash Flood Watch remains in effect for western Colorado and
southeast Utah.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

Chances of widespread heavy rain, along with potential flash
flooding or debris flows, continue through the week. Temperatures
will run below normal.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected today or tonight, however
spotters are encouraged to relay rainfall amounts or any observed
flooding to the National Weather Service in Grand Junction.

In the hours before

Local storm report, Aug 26, 9:07 AM MDT, 6 hours before

Preliminary Local Storm Report
National Weather Service Grand Junction CO
907 AM MDT Tue Aug 26 2025

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

0850 AM     Rain             2 N Bondad              37.11N 107.88W
08/26/2025  M0.65 Inch       La Plata           CO   Mesonet

            Mesonet station DRG01 Durango.

0848 AM     Rain             41 NNE Elgin            39.55N 109.91W
08/26/2025  M0.68 Inch       Uintah             UT   Mesonet

            Mesonet station WHBU1 Wildhorse.

0848 AM     Rain             4 S Sawpit              37.93N 108.01W
08/26/2025  M0.56 Inch       San Miguel         CO   Mesonet

            Mesonet station GW1216 Sawpit.

0845 AM     Rain             Dolores                 37.47N 108.50W
08/26/2025  M0.59 Inch       Montezuma          CO   Mesonet

            Mesonet station DOLC2 Dolores.

&&

Local storm report, Aug 26, 1:22 PM MDT, 1 hour 45 minutes before

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Special weather statement, Aug 26, 1:43 PM MDT, 1 hour 24 minutes before

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Special weather statement, Aug 26, 2:40 PM MDT, 27 minutes before

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Special weather statement, Aug 26, 2:45 PM MDT, 22 minutes before

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The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 25, 7:22 PM MDT	Flash Flood Warning Considerable damage threat	GJT	Mesa	68 min
Aug 25, 8:01 PM MDT	Special Weather Statement	GJT	Mesa	29 min
Aug 26, 4:59 AM MDT	Flash Flood Warning Considerable damage threat	GJT	Rio Blanco	66 min
Aug 26, 1:04 PM MDT	Flash Flood Warning Considerable damage threat	GJT	Rio Blanco	3 hr
Aug 26, 1:43 PM MDT	Special Weather Statement	GJT		32 min
Aug 26, 1:51 PM MDT	Flash Flood Warning Considerable damage threat	GJT	Rio Blanco	3 hr
Aug 26, 2:40 PM MDT	Special Weather Statement	GJT		35 min
Aug 26, 3:09 PM MDT	Special Weather Statement	GJT		36 min
Aug 26, 3:42 PM MDT	Special Weather Statement	GJT		33 min
Aug 26, 4:13 PM MDT	Special Weather Statement	GJT		32 min
Aug 26, 4:44 PM MDT	Special Weather Statement	GJT		31 min
Aug 26, 4:58 PM MDT	Special Weather Statement	GJT		32 min
Aug 26, 5:03 PM MDT	Flash Flood Warning Considerable damage threat	GJT	Montrose	3 hr
Aug 26, 5:13 PM MDT	Special Weather Statement	GJT	La Plata	32 min
Aug 26, 5:32 PM MDT	Special Weather Statement	GJT	Montrose	28 min
Aug 26, 5:44 PM MDT	Special Weather Statement	GJT	La Plata	31 min
Aug 26, 5:54 PM MDT	Severe Thunderstorm Warning	GJT	Mesa, Montrose	36 min
Aug 26, 2:05 PM MDT	Flash Flood Warning	GJT	San Juan	3 hr
Aug 26, 2:45 PM MDT	Special Weather Statement	GJT	San Juan	30 min
Aug 26, 3:17 PM MDT	Severe Thunderstorm Warning	GJT	Grand, San Juan	28 min
Aug 26, 3:23 PM MDT	Severe Thunderstorm Warning	GJT	San Juan	11 min
Aug 26, 3:42 PM MDT	Areal Flood Advisory	GJT	San Juan	2 hr
Aug 26, 3:53 PM MDT	Special Weather Statement	GJT	San Juan	37 min
Aug 26, 4:27 PM MDT	Special Weather Statement	GJT	San Juan	33 min
Aug 26, 5:04 PM MDT	Special Weather Statement	GJT	San Juan	26 min
Aug 26, 5:39 PM MDT	Areal Flood Warning	GJT	San Juan	3 hr
Aug 26, 5:52 PM MDT	Special Weather Statement	GJT	San Juan	23 min

Nearby

Severe Thunderstorm Warnings in Utah, 2025 Every severe thunderstorm warning in 2025

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.