Excessive heat again helped fuel thunderstorms with isolated high winds.
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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 again helped fuel thunderstorms with isolated high winds.
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 4, 2:26 PM MST, 6 hours 4 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 226 PM PDT Wed Sep 4 2019 .SYNOPSIS...Daily thunderstorm chances will be greatest over the higher terrain, but isolated storms may drift into the valleys at times through Thursday. Temperatures will be at or above normal for early September into Saturday. A pattern change will bring breezy conditions and cooler temperatures over the weekend into early next week. && .SHORT TERM...through Friday Night... Deeper convection ongoing over the higher terrain of central and northern Mohave county, as well as northern Inyo county. Stronger cores will be capable of gusty winds and heavy rain. Elsewhere, development is more stunted under mostly sunny skies and well above normal temperatures. This looks to be the last day of excessive heat so will allow the product to run through it expiration. Models continue to indicate a weak wave drifting east across southern Arizona and into the Mojave Desert overnight. There is a bit of spread between the near-term convective allowing models with just how much nocturnal shower/thunderstorm activity overnight. Southern Mohave county may see most of the action as outflow boundaries from central Arizona propagate westward. Anticipate outflow winds to be 40 mph or less. On Thursday, weak wave will continue to lift north across the area in association with stronger trough approaching the northern California coast. More organized convection will occur in northern Inyo and Esmeralda counties where models forecast upwards of 30 kts bulk shear. Shear not as good elsewhere but heavy rain and gusty winds again possible with stronger cores. Storm motion will inhibit flash flood potential. Decreasing shower and thunderstorm coverage expected to commence on Friday as moisture starts to decrease from west to east. Temperatures through the end of the week will remain above normal but not be as warm as those so far this month. && .LONG TERM...Saturday through next Wednesday. There has been little change among ensemble and deterministic runs on an anticipated pattern change this weekend. A deep, fall-like trough is progged to track across California and Nevada this weekend. As it does, attendant dry southwest flow will scour any remaining moisture and result in mostly clear skies, breezy to gusty winds, and dry conditions through early next week. This system will likely drop temperatures below normal by Sunday. There is some agreement that troughing will continue through at least the middle of next week. && .FIRE WEATHER...Isolated to scattered showers and thunderstorms will favor the higher terrain across the southern Great Basin and Mojave Desert through Thursday. Mature storms may produce sudden, gusty winds along with heavy downpours. Outside of thunderstorm influence, winds will be light through the morning then increase to 8-12 mph from the south this afternoon. Today will be the hottest day, with temps trending down through the rest of the week. Lowest humidities should stay in the 15-20% range through the week before a drying trend through the weekend. && .AVIATION...For McCarran...Easterly winds will give way over the next few hours as a push of southerly winds move into the Las Vegas Valley between 22-23Z. Slight chance the winds could temporarily shift to the southeast if thunderstorm outflow winds make it to the valley later this afternoon and early evening. Confidence is low on this occurring, but if it does, gusts to 20-25 mph will be possible. Shower activity is expected to be limited in the valley, but cannot be ruled out entirely. Besides possible outflow winds, winds are expected to follow south-southwesterly diurnal trends through much of tomorrow morning. The better development will be in approach corridors east of Lake Mead and to the southwest near Primm/Jean. Scattered clouds are likely to continue, becoming broken in the evening with isolated high based showers possible during the overnight hours. More widespread thunderstorm activity will be possible Thursday. For the rest of southern Nevada, northwest Arizona and southeast California...Typical summertime afternoon winds are expected across most TAF sites this afternoon with winds mainly remaining below 10- 12 knots. Some isolated showers and storms may be in the vicinity of a few airports this afternoon, which could send outflow winds, but confidence is low on these impacting most TAF sites with slightly better chances of impacting KBIH. Besides possible outflow winds, winds are expected to follow typical diurnal trends overnight. Scattered clouds are likely to continue, becoming broken in the evening with isolated high based showers possible during the overnight hours. More widespread thunderstorm activity will be possible Thursday. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && SHORT TERM/FIRE WEATHER...Pierce LONG TERM...Boothe AVIATION...Kryston 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), 135 km away, was scanning. The volume nearest the first event began at 03:30 UTC.
1 thunderstorm wind, 1 dust storm. Local standard time, as filed.
This gust was measured at the Lake Havasu City Airport (KHII).
Dust storm conditions reduced visibility to near zero in Mohave Valley.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2019Every state in 2019This day in weather historyWarnings in Arizona, 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: 857285, 857286.