The ongoing active pattern lessened somewhat, but enough moisture and support remained to trigger isolated to scattered showers and thunderstorms which resulted in a few instances of strong wind gusts and flash flooding.
Every event with a place to put it. Tap one for its entry below.
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.
The ongoing active pattern lessened somewhat, but enough moisture and support remained to trigger isolated to scattered showers and thunderstorms which resulted in a few instances of strong wind gusts and flash flooding.
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 Jul 28, 3:23 PM MST, 4 hours 52 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 423 PM MDT Fri Jul 28 2023 .SYNOPSIS...High pressure will result in continued hot temperatures through the weekend. Precipitation chances increase across southern Utah this weekend, thanks to a monsoonal moisture surge. This moisture is forecast to overspread all of Utah and southwest Wyoming from the early to middle portion of next week, with widespread showers and thunderstorms expected. && .SHORT TERM (THROUGH 12Z SUNDAY)...High pressure is currently centered over west-central New Mexico while an easterly wave/inverted trough is tracking across northern Mexico. This feature has brought moisture to western Arizona, which is now starting to get pulled into Utah under a southwest flow aloft. Latest PWAT analysis shows a gradient over southwest Utah with peak values of 0.8 inches near the St. George area, while the rest of Utah has generally 0.5-0.6 inches of PWAT. A few showers are already noted along the Utah/Arizona border, most weakening as they move into Utah. Expect showers to increase in coverage a bit across southern Utah into the evening hours, but most will remain high- based and produce little rainfall while gusty microburst winds will be a greater possibility. SREF ensemble maxes show pockets of wind gusts exceeding 40 mph this evening. The moisture will continue spreading farther north into Utah tomorrow. High-based isolated to scattered showers and thunderstorms producing gusty microburst winds are expected to develop across central Utah tomorrow afternoon. Meanwhile, southern Utah will continue to progressively moisten, with the potential for measurable rain increasing. Temperatures will remain hot into the weekend, with afternoon maxes near to above 100F in many valley areas. .LONG TERM (After 12Z/6AM Sunday)...HIGHLIGHTS: Hot temperatures will remain through the beginning of next week with a monsoonal moisture push and slight temperature decrease beginning Monday through the remainder of the week. A ridge currently setup over AZ and NM will amplify in the coming days and shift east over northern TX by early next week. A subtropical easterly wave is also currently oriented along the Gulf Coast of Mexico and southern TX, forecast to move west into the Gulf of California where it will be in an ideal location to kick off the first substantial monsoon moisture surge of the season. Ensemble means show PWAT amounts 150-200% above normal for this time of year across UT on Tuesday and Wednesday as the subtropical wave ejects northward through the Great Basin. Moisture and forcing associated with this wave will increase shower and thunderstorm activity across southern UT as early as Sunday/Monday, and then becoming more widespread across UT Tuesday and Wednesday. Typically on the leading edge of these moisture surges gusty outflow winds from thunderstorms are common as low-level moisture is slow to increase compared to the mid and upper levels, creating inverted-v profiles primed for microbursts. As the moisture becomes more abundant for this time of year, combined with the synoptic organization of the ejecting wave there will be an increased threat for heavy rainfall and flash flooding, particularly in vulnerable slot canyons and dry washes. While overall confidence in this pattern is high, cluster analysis shows subtle differences in the magnitude and exact location of the ridge axis will ultimately determine the location and timing of the heaviest precipitation. By Thursday and Friday, drier air will begin working into southwestern Utah decreasing shower and thunderstorm changes from southwest to northeast through the end of the week. With this moisture influx comes a short reprieve from triple-digits! We will see a slight cooldown with highs in the 80s and 90s for most valley locations all next week, and St. George falling below 100F on Tuesday and Wednesday. && .AVIATION...KSLC...VFR conditions expected. Light northwest winds expected to switch to southeast drainage winds between 03Z and 05Z. Northwest winds will come back between 19Z and 21Z. There is a small chance (10%) that precipitation could occur. .REST OF UTAH AND SOUTHWEST WYOMING...Isolated showers and thunderstorms possible for central and southern Utah through the evening (03Z). The better chance at seeing storms will be Saturday between 18Z and 03Z for much of central and southern Utah. Predominant west to southwest flow expected through the evening before switching to diurnal winds for the overnight period. South to southwest flow will return tomorrow morning and last through the day. The showers and thunderstorms could produce gusty and erratic outflow winds. VFR conditions expected across the area. && .FIRE WEATHER...High pressure near the Four Corners area will slowly shift east into early next week. As it does so, moisture from Arizona will gradually increase northward into Utah. Generally dry, high-based showers and thunderstorms across far southern Utah this evening will work their way farther north this weekend, while progressively becoming more wet. Some of the initial rounds of showers and thunderstorms will be capable of producing strong, gusty microburst winds, then scattered to numerous mostly wet storms are forecast for much of the area by midweek. Otherwise, temperatures will remain hot through the weekend due to the strong high pressure, but should cool for the next week in conjunction with the arrival of deeper moisture. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...None. WY...None. && Cheng/Bonner/Church/Cecava For more information from NOAA's National Weather Service visit... http://weather.gov/saltlakecity
The Salt Lake City radar (KMTX), 156 km away, was scanning. The volume nearest the first event began at 03:13 UTC.
1 thunderstorm wind, 1 flash flood. Local standard time, as filed.
The CAUSEWAY mesonet station recorded a wind gust of 65 mph as a result of outflow winds associated with a nearby cluster of convective showers moving through the area.
Capitol Reef National Park reported flash flooding associated with thunderstorms in the area, which necessitated the closure of several roads in the park, including portions of the Scenic Drive, The Capitol Gorge Road, and Pleasant Creek.
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, July 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: 1122131, 1122168.