Heavy rain resulted in a debris flow in northeast 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.
Heavy rain resulted in a debris flow in northeast 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 26, 1:18 AM MST, 11 hours 42 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 218 AM MDT Sat Aug 26 2023 .SYNOPSIS...A warming and drying trend is expected Saturday into early next week, with the potential for another monsoon surge later in the week. && .SHORT TERM (Through 12Z Monday)...Another quiet overnight period, after a day with several flash flood warnings. Early morning upper air and satellite analysis indicates gradually rising heights as high pressure builds into the area. Mesoanalysis indicates precipitable water values have fallen to 0.80-1.00" across the state. These values are closer to the 90th percentile or lower, rather than the near climatological maxes several days ago. HREF ensemble mean SBCAPE values are expected to range from around 250 to perhaps 750 J/kg across eastern and southern Utah this afternoon. Deep layer shear in this area is around 5-10 kts, with storm motions favoring an east to northeast trajectory. While not the most conducive parameters for long-lived convection, expect another day of a conditional threat of flash flooding. Given the storm motion is more east to northeast today as the upper level ridge shifts eastward, the main threat of flash flooding is expected across Capitol Reef National Park and the San Rafael Swell. Typically, storms moving in this direction aren't as high a threat of flooding for the Grand Staircase, however, given light flow, it is possible cold pools may push storms down drainage in the Staircase. Across far northwestern and western Utah, a slightly different regime is in place. Expect SBCAPE values to average around 500 J/kg, but deep layer shear is a bit higher in this area, on the order of 20-25kts. With a relatively well mixed, deep subcloud environment in place, expect any thunderstorms may bring the threat of strong and gusty microburst winds in this area. Sunday looks quite a bit quieter, with convection restricted to near the Utah/Idaho/Wyoming border area and perhaps associated with higher terrain. With a drier airmass in place, the flash flood threat will be considerably lower than the last few days for most locations, with a possible rating in the flash flood potential product for Capitol Reef and the Swell. .LONG TERM (After 12Z Monday)...The beginning of the week will see dry conditions with warming temperatures as a ridge sits over the CWA and west to northwest flow will be situated aloft. Temperatures for Monday and Tuesday will run 5F to 10F above normal. This means most valley locations will see highs in the mid to upper 90s and areas near lower Washington County and Zion NP will see highs in the low 100s. During this time, a low pressure system will be stalled off the PacNW coast. This will move inland starting on Tuesday. As this low moves inland, Wednesday becomes a transition day as this low moves by to the north and moves the ridge. This low will bring cooler temperatures with it as temperatures will go back to near normal for the middle of the week. By Thursday, there is good agreement amongst ensemble members that after the low moves by, a trough develops off the California coast and the ridge sets up to the east. The CWA will then see enhanced southwesterly flow through the end of the week. This flow direction will bring back monsoonal moisture as PWAT values increase to be between 0.7" and 1.0" across the CWA. With this moisture and increased southwesterly flow, afternoon showers and thunderstorms will be possible through the latter part of the extended period. Temperatures towards end of the week could be as low as 5F to 7F below normal. && .AVIATION...KSLC...Southeast winds expected through the overnight period. Northwest wind shift is expected between 18Z and 20Z. There is a low chance (15%) that showers or thunderstorms could impact the area during the afternoon. With these storms, winds could become gusty and erratic and there could be brief reductions in visibility. VFR conditions expected to prevail. .REST OF UTAH AND SOUTHWEST WYOMING...Isolated showers and thunderstorms are possible for much of Utah and southwest Wyoming, with the greatest chance being in eastern Utah. With these storms winds could become gusty and erratic and there could be brief reductions in visibility. VFR conditions and predominantly diurnal winds expected for the TAF period. && .FIRE WEATHER...While deep moisture continues to decrease across the region, sufficient moisture remains in place for another round of slow moving thunderstorms across mainly portions of eastern and southern Utah. A few thunderstorms with strong gusty winds are possible near the Utah/Idaho/Nevada borders in northwestern Utah. High pressure will build into the area through the weekend and remain in place through early to mid-week next week. This will bring increasingly dry conditions, with valley minimum humidities falling to near 15-25% by Sunday, gradually lowering to 10-15% by Tuesday. As a result of this dry airmass, overnight recoveries will worsen through at least midweek. Guidance continues to indicate the next monsoon surge will begin Thursday, with overnight humidities increasing as early as Wednesday night. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && Kruse/Cecava For more information from NOAA's National Weather Service visit... http://weather.gov/saltlakecity
Preliminary Local Storm Report
National Weather Service Salt Lake City UT
155 PM MDT Sat Aug 26 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0141 PM Flash Flood 7 WNW Huntington 39.38N 111.08W
08/26/2023 Emery UT Utility Company
Report of debris with mud in Huntington
Creek resulting from flow from the Trail
Mountain Burn Scar.
&&
NDThe national radar mosaic for the moment the first event began.
2 debris flow. Local standard time, as filed.
Heavy rain caused a debris flow on Cougar Run Road from the Pole Creek/Bald Mountain Burn Scar.
Debris from the East Fork Burn Scar crossed Rock Creek Road below Upper Stillwater Reservoir.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2023Every state in 2023This day in weather historyWarnings in Utah, August 2023
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: 1189261, 1189249.