Lingering monsoon moisture fueled a few thunderstorms in Mohave County. One storm produced flash flooding.
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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 VEF wrote it up.
Lingering monsoon moisture fueled a few thunderstorms in Mohave County. One storm produced 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 Las Vegas, NV wrote its last area forecast discussion before the first event at Sep 2, 1:35 AM MST, 10 hours 45 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 135 AM PDT Thu Sep 2 2021 .SYNOPSIS...A few showers or thunderstorms may linger over eastern Mohave County today and Friday. Otherwise, expect dry and warmer weather. Even hotter temperatures are expected next week under a strong ridge of high pressure. A low-grade push of moisture could bring isolated thunderstorms to the higher terrain Monday through the middle of next week. && .SHORT TERM...through Friday night. Clear skies shown by early morning satellite, although surface dewpoints remain in the mid 50's to lower 60's across southern Nevada, lower Colorado River Valley and northwest Arizona. Can't make it out on satellite but dense smoke from the Caldor fire lies across Mineral County with a visibility of 5 miles at Hawthorne. HRRR Smoke suggests that denser smoke will spread into western Esmeralda County and briefly the northern Owens Valley later this morning. Weak trough that moved through the area the past two day is accelerating east into the central High Plains tonight while trough over the Pac NW is progged to skirt across northern Nevada/Utah today and Friday. This will place the region under a drier southwest flow. However, with low level moisture slow to diminish in northwest Arizona and MUCAPE values 500-1000 J/Kg today look for isolated showers and thunderstorms to develop from the Hualapai Mountains northeast toward the Mount Trumbull area. Temperatures will stay comfortable today and Friday before returning to above normal over the holiday weekend. .LONG TERM...Saturday through Wednesday. Building heat will be the main concern through the weekend and early next week as high pressure reorganizes over the Colorado River Valley. As the high strengthens into early next week, high temperatures will climb several degrees above normal and pockets of moderate to high heat risk begin to increase across the lower desert elevations. Will need to monitor the trends for possible heat headlines, mainly in the Colorado River Valley and adjacent lower desert locations. By Tuesday and Wednesday, the high pressure ridge amplifies and shifts more into Utah and the Four Corners region, which will introduce a more easterly or southeasterly flow pattern into the region, potentially opening the door for additional monsoonal moisture intrusions. However, ensemble members are split on advancing deeper moisture into the region versus maintaining drier conditions and a more dominant ridge overhead. NBM pop trends have backed off a bit on their previous outlooks, now limiting mentionable storm chances to Northwest Arizona and the highest terrain of southern NV and Southeast California by mid-week. && .AVIATION...For McCarran...Light winds will first become southeasterly through the early-morning hours, but will shift from the southwest by late-morning. Gusts will build in around 18Z, with speeds 20-25 kts and directional variability between 180 and 230. Gusts will fall off at sunset, light and variable winds overnight. No operationally significant cloud cover through the TAF period. For the rest of southern Nevada, northwest Arizona and southeast California...Light and variable winds will become southerly through the morning, with gusts 20-25 kts picking up across the southern Great Basin. Gusts will increase across the Las Vegas Valley TAF sites, gusting from the south-southwest through the afternoon. Southerly winds will reach the KIFP and KEED, but gusts will be isolated in nature. KDAG will gust around 20 kts from the west. Wind speeds will drastically diminish after sunset. No operationally significant cloud cover through the TAF period. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && SHORT TERM...Pierce LONG TERM...Outler AVIATION...Varian 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), 115 km away, was scanning. The volume nearest the first event began at 19:20 UTC.
1 flash flood. Local standard time, as filed.
Blake Ranch Road was flooded with six inches of flowing water in four places.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2021Every state in 2021This day in weather historyWarnings in Arizona, September 2021
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: 984936.