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Aerial images show rivers of mud in Palm Springs resort town following Tropical Storm Hilary

Torrential mudflows caused by Tropical Storm Hilary have wreaked havoc across southern California, including in the resort town of Cathedral City where the scale of devastation was captured by aerial footage.

Hilary was the first tropical storm to hit California in almost a century and deluged cities including Los Angeles and San Diego before moving north into Nevada.

Officials in Palm Springs, California, announced that the city had been completely cut off by flooding on Monday. Meanwhile in Los Angeles, power outages led to a major hospital being evacuated in the Boyle Heights neighbourhood.

The clean-up was beginning on Tuesday after rivers of mud and torrential downpours swamped communities including a number of resort towns in the Coachella Valley.

Hilary first slammed into Mexico’s arid Baja California Peninsula as a hurricane, causing one death and widespread flooding before becoming a tropical storm as it moved into California.

So far no deaths, serious injuries or extreme damages have been reported in California, though officials warned that risks remain, especially in the mountainous regions where wet hillsides could unleash mudslides.

Flooding watches and warnings were issued for around half a dozen states further north on Tuesday even as Hilary’s power began to dissipate.

The slog of a clean-up began on Tuesday as crews began to dig out roads from mud and landslides, and residents waited for water to subside in homes and businesses.

An aerial view of a maintenance vehicle clearing mud near stranded vehicles along a flooded street after Tropical Storm Hilary floodwaters inundated the area on August 21, 2023 in Cathedral City, California. (Getty Images)
An aerial view of a maintenance vehicle clearing mud near stranded vehicles along a flooded street after Tropical Storm Hilary floodwaters inundated the area on August 21, 2023 in Cathedral City, California. (Getty Images)

In one dramatic scene, rescue officials in the desert community of Cathedral City, near Palm Springs, drove a bulldozer through the mud to a swamped care home and rescued 14 residents by scooping them up and carrying them to safety, Fire Chief Michael Contreras said.

“We were able to put the patients into the scoop. It’s not something that I’ve ever done in my 34 years as a firefighter, but disasters like this really cause us to have to look at those means of rescue that aren’t in the book and that we don’t do every day,” he said at a news conference.

It was one of 46 rescues the city performed between late Sunday night and the next afternoon from mud and water standing up to 5 feet (1.5 metres).

A combination satellite image shows the Cathedral City area before and after flooding caused by Tropical Storm Hilary, in Cathedral City, California, U.S., April 15, 2023 (top) and August 21, 2023 (bottom) (Maxar Technologies/Handout via REUTERS)
A combination satellite image shows the Cathedral City area before and after flooding caused by Tropical Storm Hilary, in Cathedral City, California, U.S., April 15, 2023 (top) and August 21, 2023 (bottom) (Maxar Technologies/Handout via REUTERS)

A new tropical storm made landfall in southern Texas on Tuesday facing flash flooding, strong winds and possible tornadoes from Harold which is set to make landfall around noon local time on Tuesday.

The tropical storms are the latest climate-linked disasters to impact the US this summer after devastating wildfires on the Hawaiian island of Maui and relentless, dangerous heat in many regions.

Tropical storms and hurricanes are being “supercharged” by the human-caused climate crisis, according to non-profit Climate Signals, and this year are receiving an extra boost of heat from El Nino, a recurring weather pattern in the Pacific.

Climate scientists have discovered that extra heat in the atmosphere is causing cyclones to pop up in unexpected locations, more rapidly intensify and produce more rain - leading to a greater toll on people, property and infrastructure.

AP contributed to this report.