Rain from Tropical Storm Hilary lashes California and Mexico, swamping roads and trapping cars

Tropical Storm Hilary inundated streets across Mexico’s arid Baja California Peninsula with deadly floodwaters Sunday before moving over Southern California, where it swamped roads and downed trees, as concerns mounted that flash floods could strike in places as far north as Idaho.

Forecasters said Hilary was the first tropical storm to hit Southern California in 84 years, bringing floods, mudslides, high winds, power outages and the potential for isolated tornadoes. The storm already dumped more than 6 inches (15.24 centimeters) of rain in some mountain communities and threatened more than an average year’s worth of rain in inland desert areas.

Hilary made landfall along the Mexican coast in a sparsely populated area about 150 miles (250 kilometers) south of Ensenada Sunday, then moved through mudslide-prone Tijuana, threatening the improvised homes that cling to hillsides just south of the U.S. border. By Sunday evening, the storm had moved over San Diego and was headed north into inland desert areas.

As evening fell in California, the National Weather Service in Los Angeles warned of significant flooding risk throughout populous mountain areas along the coast northeast of Los Angeles.

“PLEASE … STAY OFF THE ROADS,” the agency posted on X, formerly known as Twitter.

Mud and boulders spilled onto highways, water gushed onto roadways and tree branches fell in neighborhoods from San Diego to Los Angeles. Dozens of cars were trapped in floodwaters in typically hot and dry Palm Desert and surrounding communities across the the Coachella Valley. Crews pumped floodwaters out of the emergency room at Eisenhower Medical Center in Rancho Mirage.