Yet again, high pressure strengthened over the Desert Southwest, leading to another period of excessive heat.
Every event with a place to put it; 4 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.
Yet again, high pressure strengthened over the Desert Southwest, leading to another period of excessive heat.
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, 1:36 AM PST, 9 hours 24 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 236 AM PDT Mon Aug 24 2020 .SYNOPSIS...Drier conditions begin to progressively set in this week. Thunderstorms activity still expected today in southern Nevada and northwest Arizona. Impacts due to excessive heat will also be a concern for the Colorado River valley && .DISCUSSION... More thunderstorm activity? Tonight's analysis or current trends and review of the computer model data would suggest yes. Despite the convective activity this weekend, there still exists a fair amount of mid-level instability in the form of steep lapse rates. Combined with a similar synoptic scale set up as the last few days it makes sense to expect more activity again today. The Convection Allowing Models (CAMS) are mixed as to the extent and intensity of activity. However, they agree on the general area where formation may occur. Much of Clark and Lincoln Counties, along with Mohave County is where any of these storms would form. Not surprising given where things have been most active the last two days. Expect the storms to fire over the higher terrain in the late afternoon. Flooding and winds are the primary threat. So stronger storms may require warnings. Stay tuned. An excessive heat warning is in effect for today and tomorrow for the Colorado River Valley and southern Mohave County as both daytime and overnight temperatures are quite elevated. Those sensitive to heat should use caution. Beyond Tuesday, it appears to be smooth sailing. Little to no chance for precipitation and temperatures slightly elevated above normal. Next week we may even see a reprieve from the above normal temperatures which would certainly be welcome at this point. && .AVIATION...For McCarran...Light and variable wind through the morning hours. Storm chances today look very similar to the weekend with scattered thunderstorms primarily anchored to the mountains south through north of the valley. Outflow winds from nearby thunderstorms is the primary concern this afternoon for the terminal. Storms south of the valley bear watching as some guidance suggests stronger gusts may move north into the valley. Skies should clear overnight with less storm coverage expected Tuesday. For the rest of southern Nevada, northwest Arizona and southeast California...Isolated to scattered thunderstorm coverage today across the southern Great Basin and Mojave Desert. Stronger storms will be capable of producing gusty outflow winds, heavy rain and hail. Less storm coverage is expected on Tuesday with storms primarily confined to northwest Arizona the rest of the week && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && DISCUSSION...Lericos Aviation...Pierce 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.
5 excessive heat. Local standard time, as filed.
Excessive Heat Warning criteria were reached for four straight days.
Excessive Heat Warning criteria were reached for three straight days.
Excessive Heat Warning criteria were reached for three straight days.
Excessive Heat Warning criteria were reached for three straight days.
Excessive Heat Warning criteria were reached for three straight days.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2020Every state in 2020This day in weather historyWarnings in Nevada, August 2020
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: 911572, 911573, 911574, 911575, 911576.