A low pressure system of tropical origin moved northward into the area and combined with deep moisture to produce an afternoon of thunderstorms. These storms produced accumulating hail and heavy rainfall.
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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 REV wrote it up.
A low pressure system of tropical origin moved northward into the area and combined with deep moisture to produce an afternoon of thunderstorms. These storms produced accumulating hail and heavy rainfall.
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 Reno, NV wrote its last area forecast discussion before the first event at Sep 25, 12:29 PM PST, 3 hours 1 minute earlier. Its key messages:
Area Forecast Discussion National Weather Service Reno NV 129 PM PDT Thu Sep 25 2025 .KEY MESSAGES... * Shower and thunderstorm chances continue this afternoon, mainly south of I-80, along with a risk for heavy rain that could lead to flash flooding in Mono, Mineral and southern Lyon counties. * Another low pressure system early next week brings potential for cooler temperatures, increased precipitation chances, and gusty winds. && .DISCUSSION... Periods of showers and isolated thunderstorms are occurring across western NV, the Sierra and NE California early this afternoon as seen on radar. This showery activity is expected to continue through the afternoon and end around sunset. More thunderstorms are expected this afternoon, especially in areas south of US-50. The main hazard with any storm south of US-50 will be periods of heavy rain that could lead to flash flooding and/or mudslides near steep-terrain in Mono, Mineral and southern Lyon county. As we move into the afternoon hours the southerly flow slows down as the upper low moves south resulting in slower moving storms that could anchor themselves near mountains. Furthermore, we have plenty of moisture with PWs between 0.6-0.8 inches and instability reaching 500-700 J/kg of MUCAPE. All those environmental conditions should support the development of storms this afternoon from the Eastern Sierra towards southern Lyon and Mineral as seen in the latest HREF run. Activity appears to end mostly after sunset as the low continues its southward path. This will lead to a break in precipitation from this system starting this evening through Saturday morning for Mono/Mineral, and through Saturday evening for the rest of the region. Don't be surprised if there are a few stray showers down in southern Mono tomorrow. Otherwise, the rest of the area will be dry. Anyway, there is a 10-20% chance isolated showers and storms affecting the Mono/Mineral area on Saturday afternoon. Active weather continues on Sunday as a broad upper level trough descends from the Gulf of Alaska. This system will pull back the low that is affecting us today resulting in low chances of precipitation, 10-25% for areas north of US-50, and 25-50% for areas south of US-50. The extra moisture leads to more clouds which leads to slightly cooler temps on Sunday too. This broad upper level trough will affect us through the first half of the week bringing cooler temperatures, gusty winds, and more chances for showers and thunderstorms. Its associated cold front should pass through the region on Monday night or Tuesday morning. Thus the coolest day of the next week will be Tuesday with afternoon highs possibly in the low 60s to low 70s western NV and NE CA, and 50s to low 60s for Sierra communities. Winds increase early next week with a 30-60% chance of observing gusts exceeding 35 mph. Plus we are looking at more widespread shower activity areawide. There is still some model disagreement, and the aforementioned details could change but the trend is looking at cooler, wetter and windier conditions than this week. -HC && .AVIATION... Showers and isolated thunderstorms continue this afternoon over Sierra terminals mainly south of Lake Tahoe. KMMH may see MVFR conditions due to a 60-80% chance of storms through 03Z. Chances for showers will be around 10-30% for KRNO/KTVL/KCXP/KMEV this afternoon. Main hazards will be heavy rain, small hail, occasional lightning, and terrain obscuration. The heavy rain hazard is more likely for areas south of US-50, not so much for areas to the north. Chances will taper as the sun sets this evening, with drier conditions tomorrow. -HRICH/HC && .REV Watches/Warnings/Advisories... NV...Flood Watch until 8 PM PDT this evening NVZ001. CA...Flood Watch until 8 PM PDT this evening CAZ073. &&
Preliminary Local Storm Report
National Weather Service Reno NV
202 PM PDT Thu Sep 25 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0201 PM Hail 1 SW Toms Place 37.55N 118.71W
09/25/2025 M0.25 Inch Mono CA Trained Spotter
Also received about 0.26 inches of rain with
the storm.
&&
HCPreliminary Local Storm Report
National Weather Service Reno NV
352 PM PDT Thu Sep 25 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0200 PM Hail 1 NW Toms Place 37.57N 118.70W
09/25/2025 M0.25 Inch Mono CA Law Enforcement
CHP officer reported accumulating pea size
hail with photos. There was a rollover
accident as a result of the hail at this
location.
&&
JCThe Reno radar (KRGX), 97 km away, was scanning. The volume nearest the first event began at 23:30 UTC.
2 flash flood. Local standard time, as filed.
Video and pictures from a fire department employee and public show Buckskin Ct road flooding along with multiple houses and stables in the vicinity.
Nevada DOT reported minor debris and flooding on both directions of US-395 with both lanes blocked.
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: 1289236, 1289237.