High pressure building in from the east pushed temperatures to dangerous levels.
Every event with a place to put it; 5 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
High pressure building in from the east pushed temperatures to dangerous levels.
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 20, 3:48 AM PST, 3 hours 12 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Las Vegas NV 448 AM PDT Wed Aug 20 2025 .KEY MESSAGES... * Extreme Heat Warnings and Heat Advisories will go into effect this morning, continuing through Saturday as hotter than normal temperatures stick around through the end of the week. * Monsoonal moisture will return to the Southwestern US, bringing increased chances for afternoon showers and thunderstorms as we head into the weekend. Lightning, strong outflow winds, and heavy rain capable of resulting flash flooding will be potential hazards with these storms. && .DISCUSSION...through next Wednesday. Temperatures will continue to heat up through the end of the work week as we find ourselves under a ridge of high pressure centered over the Four Corners region. As we continue to heat up, we will see high temperatures top out around 4 to 8 degrees above normal by the end of the week. In addition to afternoon temperatures being hotter than normal, there will be little relief in the form of overnight low temperatures as those will be around 5 to 12 degrees above normal later this week. These warmer than normal overnight temperatures combined with hotter than normal afternoon high temperatures will quickly drive HeatRisk up across southern Nevada, northwestern Arizona, and southeastern California. Furthermore, with the ridge centered over the Four Corners, we will see monsoonal moisture increase across the region. This will make things feel muggier than normal, especially given how dry this summer has been. Speaking of the return of monsoonal moisture, we will begin to see chances for showers and thunderstorms creep into the eastern portions of our forecast area on Thursday afternoon. Chances for afternoon convection will become more widespread on Friday and Saturday with precipitation chances hanging around into next week. Strong outflow winds, localized heavy rain capable of resulting in flash flooding, and lightning will be threats with any storms that develop during the second half of the week. The monsoonal moisture will stick around into next week, recirculating beneath the ridge. Despite the presence of anomalous moisture, confidence in anything beyond shallow terrain based convection is low due to the subsidence beneath the ridge. However, mesoscale phenomena such as an MCV or sufficiently strong outflow winds could help with additional convective development. && .AVIATION...For Harry Reid...For the 12Z Forecast Package...Winds will generally follow diurnal patterns, similar to previous days. Variable winds this morning will veer and settle out of the east and southeast this afternoon, before shifting to the southwest this evening. Sustained speeds are expected to remain 10KT or less, with minimal chances for higher gusts. VFR conditions prevail through the forecast period, with increasing mid-level and high clouds, especially this evening onward. Temperatures today will exceed 100F between 18Z-05Z, with a high of 108F around 00Z. For the rest of southern Nevada, northwest Arizona and southeast California...For the 12Z Forecast Package...Winds across the region will generally follow diurnal patterns, with speeds remaining around 10KT or less through the forecast period. Exceptions are across the Owens Valley, where gusty up-valley winds to 20-25KT are expected to develop this afternoon, and across the western Mojave, where a period of elevated and intermittently gusty westerly winds is expected this evening into tonight. Otherwise, VFR conditions prevail with increasing mid and high clouds through tonight. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && DISCUSSION...Stessman AVIATION...Phillipson For more forecast information...see us on our webpage: https://weather.gov/lasvegas or follow us on Facebook and Twitter
The national radar mosaic for the moment the first event began.
6 excessive heat. Local standard time, as filed.
Extreme Heat Warning criteria were reached on four straight days.
Extreme Heat Warning criteria were reached on four straight days.
Extreme Heat Warning criteria were reached on four straight days.
Extreme Heat Warning criteria were reached on four straight days.
Extreme Heat Warning criteria were reached on four straight days.
Extreme Heat Warning criteria were reached on four straight days.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2025Every state in 2025This day in weather historyWarnings in Nevada, August 2025
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: 1293199, 1293200, 1293201, 1293202, 1293204, 1293205.