A weak area of low pressure passing through the Mojave Desert plus lingering moisture triggered a small area of thunderstorms. A few storms produced flash flooding over Mohave County.
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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.
A weak area of low pressure passing through the Mojave Desert plus lingering moisture triggered a small area of thunderstorms. A few storms produced flash flooding over Mohave County.
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 24, 5:42 AM MST, 2 hours 3 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 542 AM PDT Thu Aug 24 2017 .SYNOPSIS...Thunderstorm chances will linger over parts of the area today then end from west to east heading into Friday. High pressure regains control over the weekend, with dry and hot weather expected. && .UPDATE...Ongoing thunderstorm activity this morning prompted an update to the forecast grids. Scattered showers and thunderstorms are expected across the northern half of Clark County extending eastward into the north/northcentral portions of Mohave County through 8 am before dissipating and then develop again this afternoon...primarily over Mohave County. -Salmen .PREVIOUS DISCUSSION...229 AM PDT... .SHORT TERM...through Saturday night. Nocturnal convection dynamically driven by a wave of energy moving across the southern CWA continues early this morning across portions of Clark, Mohave and Lincoln counties. Storms thus far have avoided moving directly over rain gauges so it is hard to judge how much has fallen exactly however, they are moving at a good clip and likely only producing brief heavy rain with little impact other than nuisance flooding of low lying areas. The operational HRRR suggests storms this afternoon will fire again over Clark, Lincoln and Mohave counties. Possibly, a stray shower or storm could develop in eastern Nye County as well. Dry conditions will then follow for Friday and Saturday as high pressure gains control. Temperatures will begin to approach record levels with Saturday's highs expected to be 5-10 degrees above normal. .LONG TERM...Sunday through Thursday. Broad, strong ridge of high pressure expected across the western states next week. The Euro is slightly stronger than the GFS, therefore its MOS Guidance is running several degrees warmer especially compared to GFS output Tuesday-Thursday. High temperatures will be nearing records which suggests we will need to consider an Excessive Heat Watch for some areas based off the HeatRisk output. What could complicate temperatures is that both the GFS/Euro indicate there will be some mid-level moisture circulating underneath the strong anticyclone. Sunday looks dry, but can not rule out at least a slight chance of afternoon/evening thunderstorms in Mohave County and for at least the higher terrain of southern Nevada and Inyo County Monday-Thursday. && .AVIATION...For McCarran...Light southwest winds will persist through the remainde of the night becoming light and variable around daybreak. Thunderstorms will be possible over the mountains of southern Nevada, but coverage is expected to be less than yesterday and confidence is low that the terminal will be impacted by a storm. For the rest of southern Nevada, northwest Arizona and southeast California...Isolated to scattered thunderstorms will develop over southern Nevada and northwest Arizona this afternoon, but coverage is expected to be less than yesterday and primarily over northwest Arizona. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && Short Term...Aviation...Salmen Long Term...Pierce For more forecast information...see us on our webpage: http://weather.gov/lasvegas or follow us on Facebook and Twitter
The Las Vegas radar (KESX), 65 km away, was scanning. The volume nearest the first event began at 14:43 UTC.
3 flash flood. Local standard time, as filed.
Pierce Ferry Road was closed due to flooding at Archibald Wash.
Stockton Hill Road was closed from mile marker 28 to 38 due to flooding.
Temple Bar Road was closed due to water and debris.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2017Every state in 2017This day in weather historyWarnings in Arizona, August 2017
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: 715676, 715680, 715681.