A push of monsoon moisture fueled thunderstorm development over the Mojave Desert. Isolated severe weather and flash flooding occurred.
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 VEF wrote it up.
A push of monsoon moisture fueled thunderstorm development over the Mojave Desert. Isolated severe weather and flash flooding occurred.
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 Las Vegas, NV wrote its last area forecast discussion before the first event at Aug 23, 12:25 PM PST, 1 hour 15 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 125 PM PDT Sun Aug 23 2020 .SYNOPSIS...Most thunderstorms will dissipate around sunset this evening. Drier air will push in from the southwest late Monday into Tuesday, with thunderstorm chances diminishing. Sunny and hot weather can be expected for most of the region through the upcoming week. && .DISCUSSION...As forecast by previous shift, thunderstorms have fired off earlier today, so will have to be brief here. Northeast half or so of our CWA will be favored for storm development the rest of the afternoon. Drier and more stable air starts to move in tomorrow, resulting in fewer storms. A sizable majority of the region will see dry, sunny, and hot weather for much of the upcoming week. Excessive Heat Warning looks good and will let it ride. Don't want to get hopes up too high, but there are some hints that the heat wave may break in about seven days. Not expecting fall like temperatures, but highs around 100 with low dewpoints would bring some degree of relief from the recent conditions. && .AVIATION...For McCarran...Another round of storms this afternoon could bring TSRA impacts to the airfield. A tempo group was added to the 18z TAF based on multiple model sources showing strong winds moving across the airfield from various directions through 01z. There remains some potential for gusty southeast winds after 01z before becoming light and variable by midnight. Lower storm chances on Monday with a slight chance of t-storms primarily tied to the mountains. For the rest of southern Nevada, northwest Arizona and southeast California...Isolated to scattered TSRA across the region this afternoon with possible outflow wind impacts at KVGT/KHND/KBIH. Elsewhere at KDAG/KIGM/KEED, no impacts are forecast for today but can't completely rule out outflow eventually making it to these sites later today. Less storm coverage on Monday but there remains some potential for gusty outflow winds. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && Discussion...Morgan Aviation...Salmen For more forecast information...see us on our webpage: https://weather.gov/lasvegas or follow us on Facebook and Twitter
The Las Vegas radar (KESX), 92 km away, was scanning. The volume nearest the first event began at 21:37 UTC.
1 flash flood, 1 thunderstorm wind. Local standard time, as filed.
Deer Creek Road was closed in both directions due to flooding and a rock slide.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2020Every state in 2020This day in weather historyWarnings in Nevada, August 2020
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: 911562, 911563.