Flooding in southern Utah caused a portion of US-89 to be closed.
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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.
Flooding in southern Utah caused a portion of US-89 to be closed.
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 Apr 30, 2:44 PM MST, 7 hours 31 minutes earlier.
Area Forecast Discussion National Weather Service Salt Lake City UT 344 PM MDT Sun Apr 30 2023 .SYNOPSIS...High pressure will bring warming temperatures more reminiscent of early summer through early in the week. A cooler, unsettled pattern is expected to develop Thursday and continue into next weekend. && .SHORT TERM (Through 12Z Tuesday)...An amplified mid level ridge extends across the Intermountain region this afternoon, maintaining a very warm air mass across the forecast area. Temperatures this afternoon have reached the low to mid 80s along much of the Wasatch Front, and near 90 around the St George area. This ridge will shift east tonight as an upper trough located just off shore encroaches on the Pacific Coast. As this transition begins this evening, pressure falls across NV will induce an easterly gradient across northern UT, and will allow for locally gusty winds along the Wasatch Front. Speeds will remain below advisory thresholds, but could see some locally breezy to windy conditions near the canyons along the Wasatch Front this evening, before the gradient relaxes overnight. As the upper trough impinges on the Pacific Coast Monday, southerly flow will strengthen across the eastern Great Basin, resulting in breezy to windy conditions along/west of I-15. Currently not anticipating winds to reach advisory criteria (70% confidence), and thus have held off on any headlines. The air mass remains quite warm with 700mb temps forecast around 10C Monday afternoon, and thus will see another day of near record temps across northern Utah where max temps will run 15-20F above climo. Slightly cooler air aloft will begin to work its way into southern Utah, however max temps here will still run 10F for so above climo. A slight influx of mid level moisture ahead of the upstream trough along with an increase in synoptic scale lift later in the day will yield a window for high based convection late afternoon/evening. This will be most likely across the northeastern CWA (north of I-80 and east of I-15), but can't be ruled out across northwest UT, and perhaps spreading into central UT as well. Strong microburst winds would be possible with any high based convection which develops. .LONG TERM (After 12Z/6AM Tuesday)...An area of low pressure will continue to churn off the west coast with very little movement forecast through Wednesday. The timing of when this low will push onshore California has not changed much though perhaps a little later than the last model runs. What this'll all mean for Utah is a windy, but dry Tuesday and Wednesday followed by rain with snow above 8,000 feet Thursday. Modest amounts of instability could allow for thunderstorm development Thursday afternoon and evening as well. Winds are expected to be strongest in far southwest Utah Wednesday with a low level jet of 40 knots across Nevada and through northern Arizona. An 80+% likelihood for 35 knot gusts or stronger are forecast from Cedar City to Leeds as a result. Fairly widespread precipitation is forecast to begin Thursday afternoon across Utah and southwest Wyoming. Chances for showers will be fairly short- lived across southern Utah, ending by Friday morning, with continued chanced for precipitation through Friday in northern Utah. By the weekend, the general consensus is that the low begins to track to the north and potentially retrograde northwest of Utah while losing strength. This transition occurs as yet a deeper low develops off the west coast. By Monday, Utah's forecast does look to be influenced by this next incoming but this in-between period is where the forecast is less certain especially in northern Utah. At the moment, northern Utah has a 30 to 60 percent chance for rain showers Saturday and Sunday while southern Utah is dry. && .AVIATION...KSLC...The SLC terminal will see VFR conditions through the evening with mostly clear skies. Northwest winds will prevail through the remainder of the afternoon, with some light and variable or southeasterly winds for parts of the terminal through about 22Z or 23Z with the lake breeze front overhead. There is a 30 percent chance that the lake breeze front will not fully cross the terminal. Prevailing southeasterly winds are expected to return between 01Z and 03Z. .REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions will continue across Utah and southwest Wyoming through the overnight hours with some scattered clouds. Winds will be generally light and terrain driven, though some periodic southerly wind gusts up to 30 mph will impact portions of southwest Utah through the early evening. && .SLC WATCHES/WARNINGS/ADVISORIES... UT...Flood Watch through Friday morning for UTZ107. WY...None. && Seaman/NDesmet For more information from NOAA's National Weather Service visit... http://weather.gov/saltlakecity
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Law enforcement reported water up to two feet deep on US-89. One car was stuck and flooded. UDOT closed the road from Thistle Junction to Fairview due to dangerous conditions.
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, April 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: 1194996.