Persistent moist monsoonal flow fueled thunderstorms over northwest Arizona. Several storms produced flash flooding and severe weather.
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.
Persistent moist monsoonal flow fueled thunderstorms over northwest Arizona. Several storms produced flash flooding and severe weather.
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 21, 1:45 PM MST, 2 hours 53 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 145 PM PDT Sun Aug 21 2022 .SYNOPSIS...Isolated showers and thunderstorms will be possible in the eastern portions of the forecast area this afternoon and evening. High pressure will move into and over the region, ushering in warmer temperatures along with a brief reprieve from storms as they become isolated in nature. This brief reprieve is expected to last through Tuesday. Moisture and convective activity will return in the middle of the week. && .SHORT TERM...through Tuesday. Another round of isolated showers and thunderstorms will be possible again this afternoon and evening. The areas most likely to see these storms are Mohave, Clark, and Lincoln Counties. The latest 850 mb analysis shows a sharp dewpoint gradient extending from the western portions of Clark and Lincoln Counties down across the Mojave Preserve in San Bernardino County. This gradient is expected to slowly shift to the east over the course of the afternoon and evening. The dry air aloft behind this gradient will have the potential to limit convective activity over the western portions of Clark and Lincoln Counties this afternoon and evening. For the storms that do end up developing, the primary hazards will be heavy rain, frequent lightning, and strong gusty winds. Persistent northwesterly flow aloft will continue to push moisture eastward on Monday and Tuesday as an upper-level ridge moves over the area. With the eastward displacement of the deepest moisture to our east, we see PoPs decrease through early next week. While PoPs will decrease, 1" precipitable water values will linger in the southern portions of the forecast area, resulting in chances for isolated afternoon showers and thunderstorms in Mohave County and the higher terrain of Clark and eastern San Bernardino Counties. While the moisture decreases, we will see temperatures gradually increase to near seasonal values by Tuesday. .LONG TERM...Wednesday through Sunday. By Wednesday the ridge will have moved over the Four-Corners Region, resulting more southerly flow aloft. This will allow for deep moisture to return to the region. Long-range models show 1.25"-1.75" PWats moving up the Colorado River Valley into Mohave County, southeastern Clark County and eastern San Bernardino County. The current forecast reflects this increase in moisture with slightly cooler temperatures and more widespread PoPs on Wednesday and Thursday. Forecast uncertainty increases beyond Thursday as we prepare to head into the weekend. Long term guidance shows a potential trough moving through along the US-Canadian border resulting in the flattening and westward displacement of the Four-Corner's ridge. Should this happen it could potentially result in another brief lull in convective activity as the deepest moisture is pushed out of the area. However, since this occurs at the end of the forecast period and there are discrepancies between ensemble members, confidence in the exact details is low. && .AVIATION...For Harry Reid...East-southeast winds 5-8KTS will persist through the afternoon. Isolated thunderstorms developing over the mountains to the north of Las Vegas will likely move across Lake Mead early this evening. Outflow will likely reach the terminal and result in northeast or east winds temporarily gusting to at least to 20KTS 01Z-04Z. Isolated storms in the Mormon Mesa and Peach Springs corridors should dissipate by 06Z. Winds are expected to become light S-SW after 05Z and continue overnight and become light and variable early Monday morning under a mostly clear sky. Isolated storms will still possible over the mountains Monday afternoon, but will not likely create impacts in the terminal area. For the rest of southern Nevada, northwest Arizona and southeast California...Isolated thunderstorms will move toward the southeast over parts of southern Nevada and northwest Arizona this afternoon and evening with the potential for strong outflow winds which may impact IFP and EED in the Colorado River Valley 03Z-06Z this evening. Storms should dissipate after 06Z. Most of southeast California will be free of storms with winds generally less than 12KTS. Winds will be fairly light under mostly clear skies late tonight through Monday morning. Thunderstorms will be more isolated Monday afternoon over southern Nevada and northwest Arizona. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && DISCUSSION...Stessman AVIATION...Adair For more forecast information...see us on our webpage: https://weather.gov/lasvegas or follow us on Facebook and Twitter
The Cedar City radar (KICX), 123 km away, was scanning. The volume nearest the first event began at 23:39 UTC.
6 thunderstorm wind, 6 flash flood, 1 tornado, 1 dust storm, 1 hail. Local standard time, as filed.
Several photos from different angles showed a tornado over the open desert. The location is estimated.
Thunderstorm winds blew over a big rig on Highway 93 near mile marker 14.
Water, mud, and rocks covered Temple Bar Road 8 miles west of Temple Bar.
The Archibald Wash flooded Pierce Ferry Road.
Dust storm conditions reduced visibility to 1/4 mile in Valle Vista.
Thunderstorm winds damaged a horse shelter.
Thunderstorm winds damaged a tree and an antenna and blew a shed through a fence.
The Archibald Wash flooded Pierce Ferry Road.
Several roads in Golden Valley were closed.
A tree was blown over.
Hualapai Mountain Road was closed from mile marker 4.5 to the ranger station.
A mobile home roof and siding were damaged.
Trees were damaged.
Legend Ranch Road was closed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2022Every state in 2022This day in weather historyThe tornado archive for Arizona, 2022Warnings in Arizona, August 2022
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: 1055157, 1055165, 1055173, 1055177, 1055179, 1055187, 1055190, 1055193, 1055195, 1055199, 1055214, 1055215, 1055216, 1055223, 1055225.