Tropical Storm Rachel Remnants Shatter Daily Rainfall Record in Las Vegas, Dumping 1.08 Inches and Tying 79-Year All-Time Mark

LAS VEGAS, NV — Official meteorological tabulations confirmed that the tropical weather system that drenched the Mojave Desert established a historic benchmark, with the National Weather Service (NWS) verifying that the remnants of Tropical Storm Rachel dropped 1.08 inches of rain at Harry Reid International Airport.

The official measurement shattered the previous single-day rainfall record for October 11 of 0.78 inches set in 2012, while simultaneously tying the all-time daily rainfall record for the entire month of October, which has stood since October 1947.

The uncharacteristic autumn deluge generated more rainfall in a matter of hours than the Las Vegas Valley received across the entire 2026 summer monsoon season (0.50 inches), delivering roughly a quarter of the metropolitan area’s 4.18-inch annual precipitation average in a single storm cycle.

+--------------------------------------------------------+
|       NWS LAS VEGAS OCTOBER PRECIPITATION DOSSIER      |
+--------------------------------------------------------+
|  - Issuing Agency: National Weather Service (NWS)      |
|    Las Vegas Weather Forecast Office                   |
|  - Official Observation Site: Harry Reid International  |
|    Airport (LAS / Official Climatological Station)     |
|  - Event Rainfall Total: 1.08 Inches Recorded          |
|  - Daily Record Shattered: Breaks Old Oct. 11 Record   |
|    of 0.78 Inches (Previously Set in 2012)             |
|  - Monthly Record Tied: Matches All-Time 24-Hour       |
|    Record for the Entire Month of October (1947)       |
|  - Annual Context:                                     |
|      • Exceeds Entire 2026 Summer Monsoon (0.50")      |
|      • Represents ~26% of Normal Annual Total (4.18")  |
|      • Prior 2026 Year-to-Date Baseline: ~1.10 Inches  |
|  - Regional Flood Infrastructure:                      |
|      • Clark County Regional Flood Control District    |
|        (RFCD) Channels Peak Flow: Flamingo Wash,       |
|        Tropicana Wash & Las Vegas Wash                 |
|  - Strip Disruptions: Flooding at LINQ Promenade &     |
|    Parking Garage; Road Closures on East Flamingo Rd   |
|  - Event Cancellations: Age of Chivalry Festival &     |
|    Strip Susan G. Komen Breast Cancer Walk             |
+--------------------------------------------------------+

A Subtropical Tap into the Mojave Desert

The record-setting deluge occurred when the decaying circulation of Tropical Storm Rachel was drawn northeastward from the Baja California peninsula by an unseasonably deep upper-level low-pressure system moving inland over the western United States.

Atmospheric moisture levels surged, lifting precipitable water values above 1.5 inches across Southern Nevada.

Radar cores registered sustained reflectivity levels reaching 48 dBZ over the resort corridor and western valley basins, producing torrential downpours that overwhelmed street gutters and urban drainage basins.

The Clark County Regional Flood Control District (RFCD) monitored peak surges across concrete-lined channels throughout Sunday.

Along the Strip, water funneled through the lower level of the LINQ parking facility—specifically engineered to function as a bypass spillway—before draining toward the Las Vegas Wash.

The severe conditions forced organizers to cancel the final day of the Age of Chivalry Renaissance Festival at Sunset Park and a scheduled Susan G. Komen breast cancer awareness walk on the Strip.

“To put this event into historical perspective, October in Las Vegas typically yields an average of roughly 0.32 inches of rain for the entire month,” NWS meteorologists noted. “Recording 1.08 inches in one day not only shatters our daily calendar record, but it ties the wettest October day our weather station has ever observed in nearly eight decades of modern recordkeeping”.

Replenishing Washes and Ushering in Autumn Air

Prior to Sunday’s storm, Las Vegas had endured an exceptionally parched year, logging only about 1.10 inches of rain over the preceding nine months.

The tropical system effectively doubled the valley’s year-to-date precipitation total in less than 24 hours.

+--------------------------------------------------------+
|             POST-STORM METEOROLOGICAL PATTERN          |
+--------------------------------------------------------+
|  • Basin Recovery: Flood control basins safely drained |
|    tens of millions of gallons toward Lake Mead        |
|  • Clearing Skies: Tropical moisture plume exited into |
|    Utah and northern Arizona                           |
|  • Seasonal Drop: Afternoon high temperatures holding  |
|    in the mid-70s with morning lows in the mid-50s     |
+--------------------------------------------------------+

With the tropical system shifting eastward, the National Weather Service allowed all lingering Flood Watches and Wind Advisories to expire.

The departing disturbance has pulled down a crisp, stable continental air mass, locking in pleasant autumn temperatures with afternoon highs in the mid-70s and overnight lows dropping into the 50s across Southern Nevada.

Source: National Weather Service (NWS) Las Vegas Official Climate Reports, Clark County Regional Flood Control District Operations, Las Vegas Review-Journal Weather Desk.