A weak upper-level disturbance combined with monsoon moisture to produce thunderstorms over southern Nevada. Storms in Las Vegas caused minor damage.
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The episode as NWS VEF wrote it up.
A weak upper-level disturbance combined with monsoon moisture to produce thunderstorms over southern Nevada. Storms in Las Vegas caused minor damage.
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 28, 12:34 AM PST, 4 hours 26 minutes earlier.
Area Forecast Discussion National Weather Service Las Vegas NV 134 AM PDT Wed Sep 28 2022 .SYNOPSIS...Scattered showers and thunderstorms will be possible across northwest Arizona, southern Nevada, and southeastern California today, with heavy rain, flash flooding, and gusty winds possible with any storms this afternoon. Precipitation chances decrease through the rest week as drier air moves into the region. Temperatures will slowly moderate closer to normal by this weekend. && .SHORT TERM...Today through Thursday. Today should be the most impactful weather day of the week as scattered thunderstorms are expected at times. Through the early morning, a few isolated showers and storms may develop after 12Z in northern Mohave County into Clark and southern Lincoln counties as a weak piece of energy shifts east. Hi-res models have different variations of how precipitation will develop, but none of the models have widespread or impactful precipitation through the morning. By this afternoon, more widespread precipitation compared to this morning is expected across southern Nevada and western Arizona as the wave slowly shifts east and interacts with increasing moisture. PWATs will be around 1.00 inch through Clark, Lincoln, San Bernardino, and Mohave counties so some storms may produce heavy rain, and with slow moving thunderstorms this could result in flash flooding. The highest risk for flash flooding will over the northern half of Mohave County into eastern Lincoln County as well as in the Spring and Sheep Range as this is where models show the most convection this afternoon. Gusty winds will also be possible with any storms today as sounding show dry low levels and invert-V sounding, however ensembles do not suggest widespread strong winds and the best downdraft CAPE will be displaced from where storms are expected to develop today. Thunderstorms will diminish overnight. On Thursday, an incoming upper level trough will be moving through the Pacific northwest into the Rockies which will shove monsoonal moisture east. PWATs will decrease through the day as the system passes to our north. Thunderstorm activity should be limited Mohave County where moisture may hang on long enough to allow for a few afternoon thunderstorms in the terrain. Impacts will be limited as well as moisture and instability will be lower than today. .LONG TERM...Friday through Tuesday The passage of a trough to our north and high pressure reestablishing itself over the eastern Pacific will cut off the moisture source from the south and bring drier air back into the region by heading into the weekend. There will still be a chance of afternoon thunderstorms on Friday, but mainly isolated and limited to northern Mohave County. Over the weekend into early next week, we can expect to see dry air across the entire region with temperatures remaining above normal. && .AVIATION...For Harry Reid...Light winds will continue through mid-afternoon with SCT-BKN clouds between 10-15kft AGL. A stray weak shower or two is possible by sunrise but confidence is low enough to preclude from the TAF for now. Shower and storm activity will increase after 21z and may push into the Valley by the late afternoon with brief light rain and gusty winds possible. Conditions will improve after dark with showers diminishing and skies gradually clearing. For the rest of southern Nevada, southeastern California, and northwestern Arizona...Light winds this morning will give way to southerly breezes of 10-15 knots through the afternoon and evening for most of the regional TAF sites. SCT-BKN cloud cover and isolated showers are possible as well across southern Nevada and Northwest Arizona, with lower probabilities across the western Mojave Desert near KDAG. Any shower activity will tend to diminish after dark. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && SHORT TERM...Nickerson LONG TERM...Salmen AVIATION...Outler For more forecast information...see us on our webpage: https://weather.gov/lasvegas or follow us on Facebook and Twitter
The Las Vegas radar (KESX), 51 km away, was scanning. The volume nearest the first event began at 13:01 UTC.
1 lightning, 1 flash flood. Local standard time, as filed.
Lightning set fire to eight palm trees around Las Vegas.
Three drivers were rescued after their cars stalled in water, and Nellis Blvd was closed due to the flooding.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nevada in 2022Every state in 2022This day in weather historyWarnings in Nevada, September 2022
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: 1058574, 1058578.