Hilary drenched deserts and flooded roadways in California. Now it’s threatening Oregon and Idaho

PALM DESERT, Calif. — Hilary, the first tropical storm to hit Southern California in 84 years, swept people into swollen rivers, toppled trees onto homes and flooded roadways as the massive system marched northward Monday, prompting flood watches and warnings in more than a half dozen states.

The National Hurricane Center in Miami said Hilary had lost much of its steam and only vestiges of the storm were heading over the Rocky Mountains, but warned that “continued life-threatening and locally catastrophic flooding” was expected over portions of the southwestern U.S., following record-breaking rainfall.

Hilary first slammed into Mexico’s arid Baja California Peninsula as a hurricane, causing one death and widespread flooding before becoming a tropical storm, one of several potentially catastrophic natural events affecting California on Sunday. Besides the tropical storm, which produced tornado warnings, there were wildfires and a moderate earthquake north of Los Angeles. So far, no deaths, serious injuries or extreme damages have been reported in the state, though officials warned that risks remain, especially in the mountainous regions where the wet hillsides could unleash mudslides.

Winding roads in the San Bernardino Mountains east of Los Angeles were blocked by mud and debris flows. A stretch of the I-10 freeway near Palm Springs was also shut to traffic Sunday due to pooling water, but reopened Monday.

In Palm Desert, Terry Flanigan called 911 when she heard a huge crash and got a text from a neighbor that a Eucalyptus tree, more than 100 feet (30 meters) tall, fell onto a condo across the street. She later learned it landed on the bed of her neighbor’s 11-year-old son, who luckily was in another room.

“It was very unnerving,” Flanigan said, adding that the family had gone to stay with relatives while removal crews came Monday morning to remove the branches. “Oh my gosh, what could have happened.”