Tropical Storm Rachel: Heavy Rain and Flooding Threat Across the Southwest

Tropical Storm Rachel: Heavy Rain and Flooding Threat Across the Southwest

The remnants of Tropical Storm Rachel are expected to move through the Southwest from Saturday into Sunday, bringing widespread rain and the potential for localized flash flooding across portions of Southern California, Nevada, Utah, Arizona, and New Mexico. The system is forecast to track northeastward from the eastern Pacific into the Southwest, spreading tropical moisture well inland and producing periods of heavy rainfall.

Although Rachel is weakening as it moves inland, the remaining moisture associated with the system could still generate significant rainfall. The primary concern will be the potential for intense downpours, rapid runoff, and flooding in areas that are particularly vulnerable to heavy rain.

Nevada and Utah: Heavy Rain Near the Storm Track

The storm's projected path takes it through the region near Las Vegas and St. George before continuing northward toward Utah. These areas will need to be monitored closely for periods of heavy rain, especially where thunderstorms develop or rainfall persists over the same locations.

Las Vegas and surrounding communities could experience water collecting on roadways, flooding in normally dry washes, and rapid runoff from nearby terrain. Farther north into Utah, heavy rain could affect communities along the storm's projected path, with localized flooding possible in valleys, canyons, and other low-lying areas.

Arizona: Flash Flooding Concerns

Arizona will be one of the primary areas of concern as tropical moisture spreads across the state. Phoenix, Prescott, Flagstaff, and surrounding areas could experience periods of rain, with locally heavier amounts possible where thunderstorms develop.

The combination of tropical moisture and desert terrain can create dangerous flooding conditions. Dry washes can fill rapidly, while runoff from higher elevations can move into valleys and urban areas with little warning. Even locations that do not receive the heaviest rainfall directly could experience flooding downstream.

Travelers should be particularly cautious around low-water crossings, mountain roads, and normally dry drainage channels.

Southern California and New Mexico

Parts of Southern California could also experience rainfall as moisture associated with Rachel moves inland. Localized downpours may create slick roadways and flooding in poor-drainage areas, especially near terrain where runoff can collect quickly.

Across New Mexico, including portions of the Albuquerque and Santa Fe regions, periods of rain are possible as the system's moisture spreads eastward. The greatest impacts will depend on how far the heaviest precipitation extends into the state, but localized flooding cannot be ruled out.

Why Flooding Is the Main Concern

Tropical systems can transport substantial moisture far inland, even after their organized circulation begins to weaken. When that moisture interacts with the elevated terrain of the Southwest, rainfall can produce rapid runoff and dangerous flash flooding.

The greatest concerns include:

• Desert washes and dry riverbeds: Water levels can rise quickly, creating life-threatening conditions.

• Urban flooding: Heavy downpours can overwhelm drainage systems and cover roads with water.

• Mountain runoff: Steep terrain can channel water rapidly into valleys and nearby communities.

• Travel disruptions: Flooded roadways, debris, and reduced visibility could make driving hazardous.

Rainfall totals will vary considerably across the region, and the heaviest amounts will depend on the storm's exact track and where persistent bands of rain develop.

The Bottom Line

The remnants of Tropical Storm Rachel will bring a significant moisture surge into the Southwest from Saturday into Sunday. Nevada, Utah, Arizona, and portions of Southern California and New Mexico should prepare for periods of heavy rain and localized flooding.

The storm does not need to remain a fully organized tropical system to cause problems. Its remaining moisture could produce dangerous runoff, particularly across desert washes, mountain canyons, and urban areas.

Turn around, don't drown. Never drive through flooded roadways or attempt to cross a swollen wash. Water can rise quickly, and conditions may become dangerous even when rainfall is occurring some distance away.

Forecast period: 5 a.m. EDT Saturday, October 10, through 5 a.m. EDT Monday, October 12, 2026.