Moist southeast flow fueled thunderstorms over northwest Arizona. Several storms 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.
Moist southeast flow fueled thunderstorms over northwest Arizona. Several storms 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 Aug 7, 1:33 PM MST, 4 hours 57 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 133 PM PDT Sun Aug 7 2022 .SYNOPSIS...After a couple of quiet days, monsoonal moisture is expected to return in full force this week providing the fuel for daily scattered thunderstorms. The flash flooding threat is expected to increase once again as these storms will be capable of producing very heavy rain. With the additional moisture and cloud cover, temperatures will lower to around normal through the week. && .SHORT TERM...Through Tuesday. Quiet day across the region today with some leftover dust remaining over portions of the lower Colorado River Valley. Visibilities are still showing around 8-10 miles, but those are expected to improve through the afternoon. We are starting to see a few storms develop east of Mohave County, which is where the best instability is located. Additional isolated storms are forecast to build over portions of southern Mohave County and possibly as far west as the Colorado River Valley, but instability is weaker and any storms that do develop are not expected to last long, however, they could still produce brief heavy rain and gusty winds. Overnight and early Monday, the overall flow will become more southeast allowing for ample moisture to start advecting into the region. Precipitable water values are expected to increase from 0.5- 1 inch today to around 1-1.5 inches Monday. This moisture combined with better instability will lead to more coverage of thunderstorms, especially over the Spring Mountains and the mountains of eastern San Bernardino County and central/southern Mohave County. Another area to watch for thunderstorm development will be across the eastern Sierra and White Mountains as added dynamics associated with a deep low off the coast and pw's approaching 1 inch could lead to some heavier rain, especially along the Sierra Crest north of Independence. High temps will trend downward a few degrees with increasing moisture. .LONG TERM...Tuesday through Sunday. Moisture will continue to increase through Tuesday in the convergent broad southeast to southerly flow over our forecast area. In addition, there will likely be some weak vorticity advection as the easterly wave over northwest Mexico is entrained into the flow. The NBM continues to indicate Tuesday will be quite active across our entire forecast area with PoP values of 30-40 percent over the valleys and deserts and 60-70 percent in Mohave County and the southern Nevada mountains. A moist southerly flow persists Wednesday through Sunday over most of southern Nevada/northwest Arizona and eastern San Bernardino County and 20-40 percent chances of thunderstorms will be in place the rest of the week. However, a drier southwest flow is indicated after Wednesday over western San Bernardino and Inyo counties as the West Coast Low moves inland over the Pacific Northwest. This will lead to reduced chances for thunderstorms for these areas the latter half of the week. This weather pattern will also hold temperatures down a little below normal for most sites. && .AVIATION...For Harry Reid...Light winds gradually turning from the northeast to southeast to southwest can be expected into this evening. Speeds should remain primarily below 10 kts through the entire TAF period. There is a non-zero chance of a thunderstorm developing over the higher terrain south and west of the terminal this afternoon, but none of this activity is expected to move into the valley. Any cloud cover will be FEW-SCT AOA 10kft into Monday. Thunderstorm chances will increase some tomorrow, but not enough to include them in the TAF package at this time. For the rest of southern Nevada, northwest Arizona and southeast California...Typical diurnal wind patterns will continue at area TAF sites into tomorrow. Speeds will generally remain 10kts or less, although a few gusts to 20kts will be possible later this afternoon and early evening at KBIH. A few isolated thunderstorms are possible over southeastern portions of the region this afternoon and evening. Any of these will be capable of producing gusty outflows that could cause briefly higher winds, mainly at the Colorado River sites, into this evening. Otherwise, skies should be FEW-SCT AOA 10kft through the period. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && SHORT TERM...Gorelow LONG TERM...Adair AVIATION...Planz 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), 94 km away, was scanning. The volume nearest the first event began at 01:27 UTC.
11 flash flood, 1 dust storm, 1 thunderstorm wind. Local standard time, as filed.
Walnut Creek Road was flooded.
Hackberry Road was closed from Highway 66 to Interstate 40 due to flooding.
Oatman Highway was closed from mile marker 40 to Silver Creek Road.
Dust storm conditions 15 miles NNE of Dolan Springs reduced visibility to 1/4 mile.
Pierce Ferry Road was closed due to flooding.
White Hills Road was closed due to flooding.
The Vock Wash flooded Stockton Hill Road.
Six inches of water with lots of rocks and debris flowed over Pierce Ferry Road.
Multiple roads were closed due to flooding.
The Archibald Wash flooded Pierce Ferry Road and Stockton Hill Road.
Multiple roads were closed due to flooding.
A swift water rescue was performed near mile post 40 on Alamo Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2022Every state in 2022This day in weather historyWarnings 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: 1054303, 1054306, 1054308, 1054311, 1054312, 1054313, 1054315, 1054320, 1054325, 1054327, 1054329, 1054332, 1054336.