Showers and thunderstorms brought flash flooding to portions of southern Utah.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS SLC wrote it up.
Showers and thunderstorms brought flash flooding to portions of southern Utah.
The local office's own words before the first event, 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 the first event at Aug 25, 2:19 PM MST, 3 hours 11 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 319 PM MDT Mon Aug 25 2025 .SYNOPSIS...An ongoing monsoon surge will bring a heightened threat of heavy rain with any thunderstorms across the region through Tuesday. By Wednesday, drier air will begin to shift northward into southern Utah, reaching the remainder of the state by Thursday. Drier conditions are expected to continue Friday into the weekend. && .SHORT TERM (Through 12Z Wednesday)...Widespread convection continues to develop in association with an ongoing monsoon surge impacting much of the region. A weak remnant MCV is transitioning through northern Utah, supporting relatively strong convection near the Utah/Idaho border. Another, strong MCV shifting across southern Nevada is providing enhanced lift to portions of southwestern Utah. With PWATs at or above 1 inch and relatively slow storm motions, expect any thunderstorms to be capable of heavy rainfall, with rainfall rates in excess of 0.50 to 1.00" per hour. The strongest storms and/or those that train over the same areas may exceed 1.50" per hour. Another strong MCV will shift across southern Utah Tuesday morning. Timing on this MCV varies across the guidance, but the bulk of the CAMS support an enhanced threat of flash flooding across portions of southern Utah in association with this MCV after 09Z through about 18Z. As this disturbance moves northward, subsidence may suppress convection across southern Utah, particularly southwestern Utah during the afternoon. All in all, expect another busy day, starting earlier than normal, for the CWA. .LONG TERM (After 12Z Wednesday), Issued 351 AM MDT... A general southwesterly flow aloft atop low level westerly flow will result in a drying trend across the forecast area during the middle to latter portion of the week. How quickly the airmass dries is where the greatest uncertainty lies in the long term forecast, with some guidance quickly mixing this moisture out, particularly across southern Utah by Wednesday, while other guidance maintains dew points in the upper 40s and 50s statewide through Wednesday before gradually drying from south to north Thursday into Friday. In the absence of an exchange of airmasses such as with a strong cold front, more often than not moisture tends to linger longer, particularly with a moisture-rich airmass such as the one which will be in place at the beginning of the long term period. As such the idea of keeping PoPs elevated Wednesday afternoon across most of the forecast area, followed by a gradual downward trend Thursday through Friday seems reasonable. In fact, Wednesday could end up being an active flash flood day assuming low level moisture does in fact remain, as storm motions would tend to move convection into prone drainages including Capitol Reef, the San Rafael Swell, as well as the Grand Staircase and Glen Canyon Rec areas. The airmass will remain relatively cool through the duration of the week despite the decrease in cloud cover. Max temps will run 5-8 degrees below climo through Friday before gradually warming heading into the upcoming holiday weekend. && .AVIATION...KSLC...Predominant VFR conditions can be expected at the terminal through the TAF period, with northwest winds switching to diurnal southeast around 03z. Brief vicinity showers may spur erratic winds through early evening, with 40% chance of a thunderstorm spreading off the Oquirrhs and impacting the terminal during the 22-02Z timeframe, with another potential round after midnight. These storms would be accompanied by gusty outflow winds in excess of 25 kts and lightning. .REST OF UTAH AND SOUTHWEST WYOMING...Afternoon and evening showers and thunderstorms will continue across much of the region today, which may impact area terminals with gusty outflow winds, lightning, and potentially MVFR to brief IFR visibility within heavier rainfall. Southern terminals may see continued convective activity well into late evening. Away from these storms, VFR conditions with terrain driven winds can be expected. && .FIRE WEATHER...An ongoing monsoon surge will continue to bring periods of thunderstorms with a high potential for wetting rains through Tuesday. By Wednesday, drier air will begin to work into southern Utah, reaching through the remainder of the state by Thursday. This will bring a decrease in humidities, though with mainly terrain driven winds, critical fire weather conditions are not expected. Expect drier conditions over the weekend, with terrain driven winds as high pressure builds into the region. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && Kruse/Seaman/Verzella For more information from NOAA's National Weather Service visit... http://weather.gov/saltlakecity
Special Weather Statement
National Weather Service Salt Lake City UT
250 PM MDT Mon Aug 25 2025
UTZ122-252130-
Southwest Utah UT-
250 PM MDT Mon Aug 25 2025
...A strong thunderstorm will impact portions of northwestern Iron
County through 330 PM MDT
...
At 249 PM MDT, Doppler radar was tracking a strong thunderstorm 25
miles northeast of Beaver Dam, 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.
This storm will remain over mainly rural areas of northwestern Iron
County.
This includes Utah Route 56 between mile markers 16 and 21.
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 3771 11378 3786 11389 3807 11356 3783 11339
TIME...MOT...LOC 2049Z 240DEG 13KT 3779 11374
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
HMSpecial Weather Statement
National Weather Service Salt Lake City UT
316 PM MDT Mon Aug 25 2025
UTZ101-103-252145-
Eastern Box Elder County UT-Great Salt Lake Desert and Mountains UT-
316 PM MDT Mon Aug 25 2025
...A strong thunderstorm will impact portions of northeastern Box
Elder County through 345 PM MDT
...
At 315 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Snowville, moving northeast at 10 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...
Snowville.
This includes the following highways...
Interstate 84 between mile markers 0 and 5.
Utah Route 30 between mile markers 82 and 90.
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 4198 11271 4189 11292 4195 11297 4200 11287
4200 11273
TIME...MOT...LOC 2115Z 243DEG 7KT 4195 11287
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
JWThe Cedar City radar (KICX), 41 km away, was scanning. The volume nearest the first event began at 00:31 UTC.
9 flash flood. Local standard time, as filed.
Flash flooding was reported in Zion Canyon with muddy debris across the road. The East Fork of the Virgin River rose approximately 1.5 feet.
Zion National Park reported flash flooding in the main canyon, including Clear Creek.
Gauge data from Lees Ferry in Arizona suggests a flash flood on the Paria River. Time is estimated based on radar and gauge data.
Flash flooding was reported along a wash near US-89 milepost 9.
Buckhorn Draw Road was washed out, with a car on road washed a quarter mile down the road. Four people were rescued due to flash flooding.
Flash flooding was reported along Wahweap Creek near Big Water.
A gauge on the San Rafael River recorded a flood wave around 700 cfs.
The East Fork of the Virgin River recorded a flood wave of 510 cfs. A flash flood of 1290 cfs was recorded on the North Fork of the Virgin River gauge.
A debris flow out of the Buckley Draw burn scar brought flash flooding to several homes, a church, and closed down portions of Nevada Avenue and Slate Canyon Drive.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2025Every state in 2025This day in weather historyWarnings in Utah, August 2025
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1280923, 1288904, 1288906, 1288908, 1288910, 1288912, 1288913, 1288922, 1288933.