Moisture from the remnants of Pacific Tropical Storm Mario fueled isolated thunderstorms, one of which caused damage.
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The episode as NWS VEF wrote it up.
Moisture from the remnants of Pacific Tropical Storm Mario fueled isolated thunderstorms, one of which caused 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 18, 10:53 AM PST, 37 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Las Vegas NV 1153 AM PDT Thu Sep 18 2025 .KEY MESSAGES... * Increasing tropical moisture will move into the region today and Friday, bringing chances for showers and thunderstorms. Locally heavy rain and high rainfall rates will lead to an increased risk of flash flooding, especially over San Bernardino County today. * Slight chances for showers and thunderstorms will linger through the weekend, with more uncertainty next week as additional tropical moisture tries to get pulled northward. && .DISCUSSION...through Wednesday. A broad area of showers and thunderstorms continues across southern Inyo, eastern/central San Bernardino, and southern Mohave counties. This activity will push northward throughout the afternoon, likely fizzling out this evening as it reaches our southern Great Basin zones. Behind it, more robust thunderstorm development is anticipated the clear slot punches in. Some of this development is already being seen across far southern San Bernardino County. It is this activity that is the main flash flooding and severe wind concern. The extent and longevity of the secondary convection is a bit uncertain, but it is possible that this activity lasts well into the evening, bringing a flash flood and severe threat to southeast Inyo, southern Nye, Clark, and Mohave counties. Convection should begin to wane late tonight as it drifts northward. Tomorrow, showers and storms will be less widespread than today, and largely focused in southern Nevada and northwestern Arizona. Storms will continue to pose an localized flash flood and gusty wind threat. As moisture and upper-level support decrease over the weekend, convection is forecast to become even more isolated and diurnally- driven. The reduction in moisture/clouds will allow temperatures to warm near seasonable values. These conditions persist through the middle of next week as we wait to see how the next tropical remnants interact with mid-latitude flow. Currently, the most likely scenario appears to be drier and warmer conditions, but some guidance does bring the moisture into our area, resulting in another round of showers and storms around mid-week. && .AVIATION...For Harry Reid...For the 18Z Forecast Package...The expectation for today is an initial round of showers with a few rumbles of thunder possible between 19z and 01z. As this activity moves in, anticipating a push of breezy south-southwest winds followed by a return to light winds once showers/storms get established in the vicinity. During the evening hours, uncertainty grows as periods of vicinity storms are possible through 07z-09z. These storms have the potential to move into the valley and produce gusty, erratic winds, but forecast confidence is low. Light winds persist through the night, returning to a more typical pattern tomorrow morning. Another round of vicinity convection is expected Friday afternoon. CIGs largely remain at or above 10kft, but may dip down to ~8kft during any precipitation. For the rest of southern Nevada, northwestern Arizona and southeastern California...For the 18Z Forecast Package...Fairly widespread convection continues across eastern/central San Bernardino County and southern Mohave County this morning. This activity will push northward into Inyo, southern Nye, Clark, and central Mohave counties later today, with more robust convection redeveloping across San Bernardino County. Winds will likely be a bit erratic and gusty at times near any precipitation, particularly the stronger storms expected this afternoon and evening. The widespread moisture and precipitation will bring CIGs down to 8- 10kft in most of the aforementioned areas, and possibly as low as 4kft in parts of the Owens Valley. Sky conditions are expected to improve tonight across the Mojave Desert. && .SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && DISCUSSION/AVIATION...Woods 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), 70 km away, was scanning. The volume nearest the first event began at 19:29 UTC.
1 thunderstorm wind. Local standard time, as filed.
A tree was blown down, killing a miniature horse.
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, September 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: 1295923.