Excessive Heat conditions briefly returned to the Colorado River Valley and Las Vegas Valley before finally ending for the season.
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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 briefly returned to the Colorado River Valley and Las Vegas Valley before finally ending for the season.
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 3, 8:23 AM PST, 3 hours 37 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 923 AM PDT Tue Sep 3 2019 .SYNOPSIS...Increasing thunderstorm activity is expected this week as monsoonal moisture overspreads the region. Daily thunderstorm chances will be greatest over the higher terrain, but isolated storms may drift into the valleys at times. Temperatures will be at or above normal for early September. A pattern change will bring breezy conditions and cooler temperatures over the weekend and early next week. && .UPDATE...Morning analysis shows weak shortwave across northern Nevada with mid-level anticyclone centered over southwest Colorado. Aside from the weak shortwave, nothing of note in the models that will help organize storms today. HRRR and other convective allowing models staying consistent advertising convection developing over the higher terrain shortly after noon and weakening as it moves into the valleys. Latest HRRR shows the potential of a few storms impacting the south and west Las Vegas Valley this afternoon. Convection slated to dissipate early evening across the Mojave Desert while persisting longer in Inyo and Esmeralda Counties. Inherited forecast looks in good shape so no update this morning. && .SHORT TERM...Today through Thursday Night... As of 2 AM, a few light showers have persisted into the early morning but are expected to dissipate before dawn. There should be a slight uptick in convective coverage over the Mojave Desert and southern Great Basin terrain this afternoon amid low-grade moisture and marginal instability. With a clear start to the day, destabilization over the higher terrain is expected around noon with a isolated to scattered showers/tstorms possible through the afternoon and early evening. Light steering flow and weak instability will limit storm chances for the adjacent valleys. Convective activity will peak this afternoon before winding down this evening with the loss of daytime heating. That said, primary concerns today will be isolated flash flooding in the terrain and strong outflow winds. Similar convective trends are expected Wednesday. By Thursday, a shortwave trough is progged to scoot across NorCal. As it does, increased southerly flow will draw medium-grade monsoon moisture across the region. Increased moisture along with added forcing for ascent should lead to higher storm chances and wider coverage across the region. In addition to afternoon thunderstorms, temperatures will trend upward over the next couple of days as the ridge strengthens and wobbles westward. Afternoon highs will top out 4-9 degrees above normal, with the warmest temps (outside of Death Valley) expected within the Colorado River Valley. An Excessive Heat Warning has been hoisted along the Colorado River valley to highlight dangerous temperatures over the next couple of days. Temperatures will begin a downward trend Thursday as the aforementioned shortwave trough edges into the Pacific Northwest. .LONG TERM...Friday through next Tuesday... There is good agreement on a shift to a more progressive pattern this weekend. A fall-like shortwave trough is progged to track across the Great Basin. Under this pattern breezy gradient winds are expected to develop across the region along with a drastic cool down, which may drop temperatures below normal early next week. && .FIRE WEATHER...Isolated to scattered showers and thunderstorms will favor the higher terrain across the southern Great Basin and Mojave Desert this afternoon. Mature storms may produce sudden, gusty winds along with heavy downpours. Outside of thunderstorm influence, winds will be light and follow diurnal patterns. Temperatures will trend up through Wednesday before gradually decreasing through Saturday. Lowest humidities should stay in the 15-20% range through the week before a drying trend through the weekend. && .AVIATION...For McCarran...In general, wind speeds should be light through the TAF period and favor typical diurnal trends. Fly in the ointment will be potential for thunderstorm development south and west of the airfield, which would send gusty outflow winds to the terminal after 21z. Low confidence in this occuring, but it is a possibility. Should it materialize, a few gusts exceeding 20 knots will be possible, likely from the south or southwest. Shower activity will ease after dark with light southerly drainage winds returning. For the rest of southern Nevada, northwest Arizona and southeast California...Generally light winds favoring diurnal patterns will be common across the region today, with scattered clouds developing during the afternoon. A few showers and thunderstorms may develop , especially along and north of a KDAG-KSGU line, and could produce gusty surface outflow winds with gusts exceeding 25 knots. Any shower activity will quickly cease after dark. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && UPDATE...Pierce DISCUSSION/FIRE WEATHER...Boothe AVIATION..................Outler 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
835 AM PDT TUE SEP 3 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1225 AM FLASH FLOOD 2 WSW EARP 34.16N 114.33W
09/02/2019 SAN BERNARDINO CA DEPT OF HIGHWAYS
CALIFORNIA DOT REPORTED FLOODING ON HIGHWAY
62 ABOUT 3 MILES WEST OF THE ARIZONA STATE
LINE. THE ROAD WAS CLOSED AT 0030 AND
REOPENED AT 0434.
&&
ASGThe national radar mosaic for the moment the first event began.
2 excessive heat. Local standard time, as filed.
Excessive Heat Warning criteria were reached in the Lake Mead National Recreation Area.
Excessive Heat Warning criteria were reached in the Las Vegas Valley.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2019Every state in 2019This day in weather historyWarnings in Nevada, 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: 857282, 857283.