A brief influx of monsoon moisture brought thunderstorms to the southern Mojave Desert. Some of the storms produced 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.
A brief influx of monsoon moisture brought thunderstorms to the southern Mojave Desert. Some of the storms produced 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 Jul 22, 2:04 PM PST, 3 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 304 PM PDT Mon Jul 22 2019 .SYNOPSIS...Monsoon moisture will continue to spread into the region through Thursday which will result in a marked increase in clouds and humidity but also increased afternoon and evening thunderstorm activity. Less shower and thunderstorm coverage is expected over the weekend along with above normal temperatures. && .DISCUSSION...through next Monday. Transition into our seasonal monsoon pattern underway today as low/mid levels of the atmosphere continue to moisten from Las Vegas south. As of 2 pm, some stations within the Las Vegas valley have seen their surface dewpoints rise into the lower 50s. An area with dewpoints in the 60s still encompasses the lower Colorado River Valley. So far, instability has been lacking across Mohave and Clark Counties with light rain or virga occurring. As isolated thunderstorm has developed between Joshua Tree and 29 Palms. Gusty winds and lightning primary concerns with todays activity. Tonight: HRRR and other near term guidance suggests thunderstorm complexes that merge over central Arizona will eject an outflow boundary westward that will move into southeast Mohave County around midnight. The added lift from the boundary may be enough to tap into elevated instability. So, increased POPs between the 06z and 12z forecast hours tonight. Tuesday-Thursday: No much change to the forecast these days. Moisture will continue to stream northward into central Nevada Tuesday and linger through Thursday. Even as the lower levels moisten, inverted-V forecast soundings for Tuesday; slightly less indication for Wednesday support idea of gusty winds primary threat. Although, can rule out possibility of isolated heavy rain and flooding on Wednesday and Thursday. The higher humidity and cloud cover will lead to cooler highs and warmer overnight lows. Friday-Monday: Ensembles continue to support the idea of gradual decrease in convection coverage during the period. As the Four Corner high shifts back westward temperatures will rise back above normal. && .AVIATION...For McCarran...For this afternoon and evening, looking less likely for thunderstorms in the higher terrain to the west, so not anticipating gusty west winds at this time this evening. Expect winds to slowly turn southeast, with gusts to around 15kts possible. Tonight will start with typical southwest wind patterns and increasing mid to high level clouds. By early Tuesday morning, still watching the potential for a switch to the southeast around 12Z from a possible outflow out of Arizona. Did include the switch to the southeast in the TAF, however low confidence in wind speeds. If southeast winds do not make it to LAS, winds will remain southwest and then should become light and variable after 14Z. Low confidence in Tuesday forecast. Showers and thunderstorms should develop over southern NV, however location and timing is uncertain. Wind forecast Tuesday afternoon current reflects typical wind patterns, however this may change based on outflow winds from area thunderstorms. Slight chance thunderstorms move into the valley, mainly after 21Z. For the rest of southern Nevada, northwest Arizona and southeast California...Showers and thunderstorms will continue near DAG through the evening before dissipating this evening. Winds may become gusty and erratic base don how strong thunderstorms become and if outflows move through. Moderate confidence in the overnight forecast across the region. Showers and isolated thunderstorms may develop late this evening and overnight in Western AZ, which would rotate through IFP/EED around midnight if they develop. Did not include precip in the TAFs at this time due to low confidence. This area of showers and thunderstorms may rotate northward and effect southern NV as well by Tuesday morning. The other unknown overnight is whether or not an outflow pushed north and west out of Arizona. Best chance for gusty erratic winds would be in IFP/EED, where gusty southeast winds are possible. Outside of convection, expect typical wind patterns with i increasing mid to high level clouds. More thunderstorms are possible Tuesday afternoon, with low confidence in current TAF forecast. && .SPOTTER INFORMATION STATEMENT...As moisture continues to increase into the region. Spotters are encouraged to report any significant winds, hail and rainfall that produce impacts according to standard operating procedures. && DISCUSSION...Pierce AVIATION...Wolf For more forecast information...see us on our webpage: http://weather.gov/lasvegas or follow us on Facebook and Twitter
The Santa Ana Mts radar (KSOX), 130 km away, was scanning. The volume nearest the first event began at 22:06 UTC.
5 flash flood. Local standard time, as filed.
Highway 62 was flooded in several places, and Que Pas Lane was also covered with rocks and debris.
Very high, fast-flowing water in the Fortynine Palms Wash flooded Highway 62 in at least two places and closed at least seven secondary roads in the Twentynine Palms area.
Highway 95 was flooded with water and debris at mile marker 70.
Highway 62 was flooded at mile marker 93.
Barbara Lane was flooded near Garden Road, and Amboy Road was flooded near Thompson Road. One car was stuck in the wash.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 2019Every state in 2019This day in weather historyWarnings in California, July 2019
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: 837653, 837656, 837657, 837659, 837661.