Tropical Storm Hilary drenched Southern California on Sunday from the coast to the desert resort city of Palm Springs, forcing rescuers to pull several people from swollen rivers, before heading east and flooding a county about 40 miles outside of Las Vegas.

The National Hurricane Center in Miami downgraded Hilary to a post-tropical storm Monday morning, but warned that “continued life-threatening and locally catastrophic flooding” was expected over portions of the southwestern United States, along with “record breaking” rainfall and potential flooding as far north as Oregon and Idaho.

Remnants of the storm that first brought soaking rains to Mexico’s arid Baja California peninsula and the border city of Tijuana were expected to linger at least through Tuesday morning.

A large freeway cuts through the desert landscape. However, parts of this road are completely blocked off by large quantities of water that remain after heavy rains. — An aerial image shows no traffic on Interstate 10 due to flooding and mud crossing the highway following heavy rains from Tropical Storm Hilary, in Rancho Mirage, California, on Aug. 21, 2023. (David Swanson/AFP via Getty Images)

Gov. Gavin Newsom declared a state of emergency on Saturday for much of Southern California, a typically dry area, but where residents on Sunday had to battle flooded roads, mudslides and downed trees. Winding roads in the San Bernardino Mountains east of Los Angeles were blocked by mud and debris flows. A stretch of the Interstate 10 freeway near Palm Springs was also shut to traffic due to pooling water from the storm.

Along the coast, a stretch of the Pacific Coast Highway in surf-friendly Huntington Beach was also flooded.

“Thank God my family is OK,” Maura Taura said after a three-story-tall tree crashed down on her daughter’s two cars but missed the family’s house in the Sun Valley area of Los Angeles.

Several large trees have fallen over in a residential area. One tree has yellow tape that reads "Caution" wrapped around it. — A view of a tree that fell onto a house on Aug. 21, 2023 in Sierra Madre, California. (Justin Sullivan/Getty Images)

Hilary is just the latest major weather or climate disaster to wreak havoc across the U.S., Canada and Mexico. Hawaii’s island of Maui is still reeling from a blaze that killed more than 100 people and ravaged the historic town of Lahaina, making it the deadliest U.S. wildfire in more than a century. Firefighters in Canada are battling that nation’s worst fire season on record.

The first tropical storm to hit Southern California in 84 years, Hilary first made landfall in Baja California on Sunday in a sparsely populated area about 150 miles south of Ensenada. One person drowned. It then moved through mudslide-prone Tijuana, threatening the improvised homes that cling to hillsides just south of the U.S. border.

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Hilary dropped more than half an average year’s worth of rain on some areas, including Palm Springs, which saw more than 3 inches of rain by Sunday evening.

Forecasters warned of dangerous flash floods across Los Angeles and Ventura counties, and fire officials rescued 13 people from knee-deep water in a homeless encampment along the rising San Diego River. Meanwhile, rain and debris washed out some roadways and people left their cars stranded in standing water. Crews pumped floodwaters out of the emergency room at Eisenhower Medical Center in Rancho Mirage.

https://twitter.com/NWSSanDiego/status/1693562308709261731

Sunday was the wettest day on record in San Diego, with 1.82 inches, the NWS said in a post on X, the social media site formerly known as Twitter. The previous record was on Aug. 17, 1977, when 1.8 inches of rain fell in the area following Hurricane Doreen.

“We basically blew all of our previous rainfall records out of the water,” Elizabeth Adams, a National Weather Service meteorologist in San Diego, told The Associated Press. In Palm Springs, the inundation on Sunday — of 3.18 inches — shattered the daily record of 0.21 inches set in 2003.

The center of Hilary passed over downtown Los Angeles at 7 p.m. Sunday, according to the regional weather office, which called it “a day for the ages” in Southern California.[aside label='Stay Prepared With KQED Guides' tag='audience-news']Despite the deluge, Los Angeles Fire Chief Kristin Crowley said no significant injuries or damages were reported.

Los Angeles City Council President Paul Krekorian told a news conference that the city “was tested but we came through it, and we came through it with minimal impacts considering what we endured.”

The Los Angeles Unified School District, the nation’s second largest school system, said all campuses were closed Monday. San Diego schools postponed the first day of classes of the school year from Monday to Tuesday. For LAUSD students, grab-and-go sites were set up to provide meals.

The Palm Springs Police Department said in a statement Sunday that 911 lines were down and that in the event of an emergency, residents should text 911 or reach out to the nearest police or fire station.

A tropical storm last roared into California in September 1939, ripping apart train tracks, tearing houses from their foundations and capsizing many boats. Nearly 100 people were killed on land and at sea.[pullquote align="right" size="medium" citation="LA City Council President Paul Krekorian"]‘Los Angeles was tested but we came through it, and we came through it with minimal impacts considering what we endured.’[/pullquote]As skies were clearing Monday in the state, the National Weather Service warned of flooding underway in the Mount Charleston area of Clark County, Nevada, about 40 miles west of Las Vegas. Forecasters said the threat for flooding in states farther north on Monday was highest across much of southeastern Oregon into the west-central mountains of Idaho.

In the Caribbean, meanwhile, Tropical Storm Franklin churned on Monday near Haiti and the Dominican Republic, where authorities warned residents to prepare for floods and landslides.

Forecasters at the National Hurricane Center are also watching weather developments in the Gulf of Mexico that now has an 80% chance of developing into a tropical disturbance or tropical storm before reaching the western Gulf coastline on Tuesday. Forecasters urged people along the coast in northern Mexico and Texas to monitor the system, adding that tropical storm watches or warnings may be issued later Monday.

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