This is a continuation of the July 17-21 Thunderstorms episode, which lasted ten days total.
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.
This is a continuation of the July 17-21 Thunderstorms episode, which lasted ten days total.
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 Jul 24, 10:40 AM MST, 2 hours 50 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 1040 AM PDT Sat Jul 24 2021 .SYNOPSIS...Moist and unstable air will remain in place through the weekend, providing fuel for thunderstorms. A large circulation moving in from Arizona will likely bring additional moisture and more extensive thunderstorm development across the entire region especially late Sunday into Monday. After this disturbance passes by, lower thunderstorm chances are expected Tuesday through Thursday. && .UPDATE...Satellite loops clearly show the influence of the large inverted trough moving across Arizona from New Mexico as clouds move from northeast to southwest. The 500mb high center was will be circulating between Tonopah and Reno today which will result in a persistent northeast steering flow across southern Nevada and nearby areas of Mohave and San Bernardino counties. The latest HRRR and other HREF members indicate thunderstorms will develop over southern Lincoln County and southwest Utah this afternoon then propagate toward the southwest late this afternoon and evening. Mohave county and the area from Lake Mead to Lake Havasu will be under the greatest threat for thunderstorms to move through, but the Las Vegas Valley will likely see gusty northeast winds and a 20-30 percent chance for thunderstorms. All gridded forecast elements were updated with the latest NBM data along with CAM PoPs and high res wind models to reflect the latest trends. && .PREV DISCUSSION...144 AM PDT .SHORT TERM...through tonight. Satellite and area radars showed a weakening thunderstorm complex pushing south through southern Mohave county at 1 AM. These storms had dumped heavy rain on and around the Flag Fire scar, and had also pushed an outflow boundary northwestward into Boulder City. These storms are continuing to weaken, although perhaps not as quickly as high resolution models might suggest. The rest of our area was under partly to mostly cloudy skies, with warm and humid conditions and light winds. Another round of thunderstorms this afternoon and evening is the main concern again. A consensus of high res models, which has been performing well the past few days, shows Mohave county lighting up this afternoon. Greater forecast coverage of storms today versus yesterday plus deep moisture in place justifies keeping the Flash Flood Watch. Elsewhere, isolated to scattered storms can be expected from the Sierra crest across the southern Great Basin, over the Clark county mountains, and possibly as far south as the Mojave National Preserve. Mohave county will be the most likely area for storms to persist all night, although there isn't much model consensus on this. .LONG TERM...Sunday through Friday. Main concern continues to be the potential for thunderstorms with flash flooding Sunday into Monday. Overall, not much change in the expectation with this Sunday into Monday forecast. Some of the models do show the easterly wave moving in faster than previous model runs, which could change the timeframe of the best and most widespread precipitation. It could also influence Monday afternoon precipitation chances as a few models show the wave already through Mohave County and southern Nevada by 18Z monday, and therefore the higher chances Monday afternoon would actually be shifted more northwest than previous forecasts. Also a bit concerned that if the wave is too fast and push into Mohave and southern Nevada Sunday night, we will not see as much thunderstorm activity as previously was expecting. Will need to continue to watch model trends and hopefully the timing of everything will shake out in the next 12 to 24 hours. Either way, no matter when the easterly trough moves through, decent vorticity associated with the inverted trough will be enough scattered to widespread precipitation. A second push of moisture is expected Saturday night into Sunday morning, so there will be a very moist airmass in place for when thunderstorms develop. Ensembles are showing increasing probabilities for PWATs of 2inch or more in the southern Colorado River Valley and eastern San Bernarino County Sunday night into Monday, with over an inch likely across the entire region. The system is expected to slowly exit Tuesday. Some lingering PoPs each afternoon, especially in the Southern Great Basin area, however the there will be less of a flash flood threat after Monday as PWATs start to drop off behind the trough. Temperatures will climb a bit compared to what we have been experiencing the past week as drier air (compared to the monsoonal airmass) moves into the region. Some long range models and ensemble solutions do show the main area of high pressure settling back in to a more favorable position for monsoonal flow by the end of the week or over next weekend, however confidence is low and models do not agree on the exact set up for next weekend. && .AVIATION...For McCarran...No additional thunderstorm activity or outflow winds are expected in the valley through the morning hours. Another round of storms is possible this afternoon and evening with gusty outflow winds the primary concern although brief heavy rain is also possible. Storm activity drops off overnight tonight and ramps back up on Sunday with chances continuing Sunday night and Monday. For the rest of southern Nevada, northwest Arizona and southeast California...More storms are forecast this afternoon and evening, primarily affecting the Las Vegas Valley and Colorado River Valley air terminals with gusty outflow winds. There is a better chance of storms impacting all terminals Sunday and Monday as a weather system moves in from the east. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && UPDATE...Adair SHORT TERM...Morgan LONG TERM...Nickerson AVIATION...Salmen 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), 68 km away, was scanning. The volume nearest the first event began at 20:32 UTC.
10 flash flood, 3 thunderstorm wind, 1 dust storm. Local standard time, as filed.
Thunderstorm winds snapped about 20 power poles along Oak Street and Mohave Avenue.
Short Creek flooded and closed several bridges and low water crossings in Colorado City. One vehicle was rescued.
A pickup truck tried to cross a flooded intersection on Queens Bay Road and got swept downstream.
Hackberry Road was closed from Highway 93 to East Austin Peak Road, and Knight Creek Road was closed from Hackberry Road to milepost 4.6 due to flooding.
Spotters and public reported dust storm conditions affecting Kingman, Chloride, and Dolan Springs.
Antares Road was closed from Highway 66 to Pierce Ferry Road due to flooding.
Strong winds on Lake Mohave caused numerous boaters to be rescued from their boats (which were left behind).
There were at least four swift water rescues, and numerous roads were closed.
Waist deep water flowed over the intersection of Bank Street and Calle Castano.
Hackberry Road was closed from Main Street to Route 66 due to flooding.
Oatman Highway was closed due to flooding.
The intersection of Oatman Highway and Route 66 was flooded.
Signal Road was closed from Highway 93 to Alamo Road due to flooding.
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, July 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: 975440, 975441, 976147, 976148, 976156, 976158, 976160, 976175, 976162, 976168, 976178, 976187, 976189, 976190.