Excessive heat conditions helped maintain thunderstorms which rolled in from the east late in the evening, bringing damaging winds and isolated 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.
Excessive heat conditions helped maintain thunderstorms which rolled in from the east late in the evening, bringing damaging winds and isolated 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 Sep 1, 1:40 PM PST, 8 hours earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 240 PM PDT Sun Sep 1 2019 .SYNOPSIS...Thunderstorm chances will increase this week as monsoonal moisture makes a return to the southern Great Basin and Mojave Desert. Thunderstorm chances will mainly impact areas south of I-40 this evening, but will gradually push north through the remainder of the week. Gusty winds and flash flooding will be the primary threats from these storms. Given increased clouds and shower activity, temperatures will cool to near normal values for early September. && .DISCUSSION...through Sunday. Once again, hot temperatures are impacting the region this afternoon with readings running several degrees above normal. Today will be the last day of excessive temperatures as the strong high pressure that has been sitting over the area shifts east and we also get an increase in monsoonal moisture. Mid level clouds have generally been increasing through the afternoon as the moisture starts making its push northward. Thunderstorms have increased in coverage this afternoon across central and southern Arizona and have developed just east of Mohave County. Local hires models have been rather consistent today in developing a thunderstorm complex that will track west across southern Mohave County and impact the Colorado River Valley this evening, likely between 8pm and midnight. Not only will there be potential of brief heavy rain, but strong gusty winds will be possible. Some of the models are showing outflow winds between 40+ mph affecting southern areas of Mohave County through the Colorado River Valley including Lake Havasu, so boaters should especially be cautious this evening and prepare for the potential for strong winds. This complex may continue into southern Nevada, but indications are that it will weaken significantly, but a few sprinkles will be possible overnight. Monsoon moisture will continue to push north over the next few days resulting in isolated to scattered showers and thunderstorms each afternoon through the end of the week, especially in the favored higher terrain. Gusty winds and the potential for flash flooding will be the biggest concerns as the upper steering flow remains fairly light through Wednesday. Beyond Wednesday, the models differ on how quick the moisture gets pushed out of the area. It's possible that we could see at least a chance of afternoon thunderstorms each day into next weekend as the trough off the west coast may not move in as quick. Temperatures will remain near to slightly above normal through the week. && .AVIATION...For McCarran...Winds will gradually shift to the south southeast by mid afternoon with gusts of 15-20 knots possible. Early this evening gusts will taper off as winds shift to the southwest at around 10 knots or less through early tomorrow morning. There continues to be a low-end chance of some brief, gusty outflow winds moving through the valley out of the southeast between 06z-09z associated with storms over northwest Arizona. If this scenario does occur, speeds do not look to to be very impactful leaving the wind shift as the main concern. Light, easterly winds are expected Monday morning which will then favor the southerly direction during the afternoon. However, this could change quickly as scattered showers and storms develop around Clark County between 20z-05z. For the rest of southern Nevada, northwest Arizona and southeast California...Outside of shower and storm development, winds will remain south to southwesterly today and tomorrow with gusts up to around 20 knots possible both afternoons. Hi-res models continue to indicated an area of showers and storms moving into Mohave County later this evening into tonight; pushing towards the Colorado River Valley terminals. Estimated wind shifts and VCSH have been included at these locations but confidence is low in these outflow winds making it all the way up into the Las Vegas Valley. A few showers could linger into Monday morning with afternoon showers and storms initiating between 19z-21z. Locally heavy rain, lightning, and gusty winds will be possible with storm activity Monday afternoon and evening. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && DISCUSSION...Gorelow AVIATION...Guillet For more forecast information...see us on our webpage: http://weather.gov/lasvegas or follow us on Facebook and Twitter
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
1012 PM PDT SUN SEP 1 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1005 PM DUST STORM 1 WSW LAKE HAVASU CITY 34.48N 114.35W
09/01/2019 MOHAVE AZ TRAINED SPOTTER
SPOTTER REPORTS A DUST STORM IN LAKE HAVASU
CITY ALONG WILLOW AVENUE NEAR AZ 95 WITH
VISIBILITY TO NEAR ZERO.
&&
VARIANThe Las Vegas radar (KESX), 127 km away, was scanning. The volume nearest the first event began at 05:40 UTC.
2 thunderstorm wind, 1 flash flood, 1 dust storm. Local standard time, as filed.
The peak gust occurred at 2230 PST.
Power poles were blown down across Amboy Road.
Highway 62 was flooded and closed.
Dust storm conditions reduced visibility below 1/4 mile in the Barstow area.
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, September 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: 857271, 857272, 857273, 857274.