It’s not ‘traditional’ wildfire season – so why have the California fires spread so quickly?
A real-life drama is unfolding just outside Hollywood. Ferocious wildfires have ballooned at an “alarming speed”, in just a matter of hours. Why?
What caused the California wildfires?
There are currently three wildfires torching southern California. The causes of all three are still being investigated.
The majority (85%) of all forest fires across the United States are started by humans, either deliberately or accidentally, according to the US Forest Service.
But there is a difference between what ignites a wildfire and what allows it to spread.
However these fires were sparked, other factors have fuelled them, making them spread quickly and leaving people less time to prepare or flee.
The main culprit so far is the Santa Ana winds.
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LA residents face ‘long and scary night ahead’
What are Santa Ana winds?
So-called Santa Ana winds are extreme, dry winds that are common in LA in colder winter months.
The California Department of Forestry and Fire Protection warned strong Santa Ana winds and low humidity are whipping up “extreme wildfire risks”.
Winds have already topped 60mph and could reach 100mph in mountains and foothills – including in areas that have barely had any rain for months.
It has been too windy to launch firefighting aircraft, further hampering efforts to tackle the blazes.
These north-easterly winds blow from the interior of Southern California towards the coast, picking up speed as they squeeze through mountain ranges that border the urban area around the coast.
They blow in the opposite direction to the normal onshore flow that carries moist air from the Pacific Ocean into the area.
The lack of humidity in the air parches vegetation, making it more flammable once a fire is started.
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Wildfires spread as state of emergency declared
The ‘atmospheric blow-dryer’ effect
The winds create an “atmospheric blow-dryer” effect that will “dry things out even further”, said Daniel Swain, a climate scientist at University of California, Los Angeles (UCLA).
The longer the extreme wind persists, the drier the vegetation will become, he said.
“So some of the strongest winds will be at the beginning of the event, but some of the driest vegetation will actually come at the end, and so the reality is that there’s going to be a very long period of high fire risk.”
What role has climate change played?
California governor Gavin Newsom said fire season has become “year-round in the state of California” despite the state not “traditionally” seeing fires at this time of year – apparently alluding to the impact of climate change.
Scientists will need time to assess the role of climate change in these fires, which could range from drying out the land to actually decreasing wind speeds.
But broadly we know that climate change is increasing the hot, dry weather in the US that parches vegetation, thereby creating the fuel for wildfires – that’s according to scientists at World Weather Attribution.
But human activities, such as forest management and ignition sources, are also important factors that dictate how a fire spreads, WWA said.
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Pic: Reuters
Southern California has experienced a particularly hot summer, followed by almost no rain during what should be the wet season, said Professor Alex Hall, also from UCLA.
“And all of this comes on the heels of two very rainy years, which means there is plenty of fuel for potential wildfires.
“These intense winds have the potential to turn a small spark into a conflagration that eats up thousands of acres with alarming speed – a dynamic that is only intensifying with the warmer temperatures of a changing climate.”
The flames from a fire that broke out yesterday evening near a nature reserve in the inland foothills northeast of LA spread so quickly that staff at a care home had to push residents in wheelchairs and hospital beds down the street to a car park.
Former US president Joe Biden has prostate cancer, his office has said.
The statement said Mr Biden, who left the White House in January, is reviewing options for treatment with his physicians.
It read: “Last week, President Joe Biden was seen for a new finding of a prostate nodule after experiencing increasing urinary symptoms.
“On Friday, he was diagnosed with prostate cancer, characterised by a Gleason score of 9 (Grade Group 5) with metastasis to the bone.
“While this represents a more aggressive form of the disease, the cancer appears to be hormone-sensitive which allows for effective management.
“The President and his family are reviewing treatment options with his physicians.”
File pic: Reuters
According to Cancer Research UK, a Gleason score of 9 means the cancerous cells “look very abnormal” and the disease is “likely to grow quickly”.
A source familiar with Mr Biden and his family’s thinking has told Sky’s US partner network, NBC News, that the former president is considering “multiple treatment options” – including hormone treatment for the cancer.
They added he is at his home in Wilmington, Delaware, and that as of now, it is unclear where the former president will be treated.
Mr Biden, 82, was the oldest person to ever serve as president, with concerns about his health raised regularly during his campaign for re-election last year.
After a poor debate against Donald Trump in June, he withdrew from the 2024 election and endorsed his vice president Kamala Harris.
In February 2023, he had a skin lesion removed from his chest that was a basal cell carcinoma, a common form of skin cancer.
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A Mexican navy ship has hit the Brooklyn Bridge during a promotional tour in New York City.
The New York Fire Department said authorities were responding to injuries but had no details about how many people might have been hurt or whether they were on the vessel or on the bridge.
Sky’s US partner network NBC News reports that at least three people were seriously injured in the incident.
The Mexican navy said in a post on X that the Cuauhtemoc, an academy training vessel, was damaged in the accident, which has prevented it from continuing its voyage.
Eyewitness video of the collision posted online showed the mast of the ship, which was flying a large Mexican flag, scraping the underneath of the bridge.
Pic: AP
The vessel then drifted toward the edge of the river as onlookers scrambled away from shore.
The Mexican navy said the status of personnel and material was under review by naval and local authorities, which were providing assistance.
The Cuauhtemoc is about 297ft long and 40ft wide, according to the Mexican navy. It sailed for the first time in 1982.
Pic: AP
Each year, it sets out at the end of classes at the naval military school to finish cadets’ training.
It left the Mexican port of Acapulco, on the Pacific coast, on 6 April with 277 people onboard, the navy said at the time.
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One person has died in a bomb explosion near a reproductive health clinic in California, authorities have said.
The incident took place in Palm Springs, a city two hours east of Los Angeles, and is being investigated as a possible car explosion.
The city’s mayor Ron DeHarte said one person died in the blast, adding that the bomb was “either in or near” a vehicle. The deceased’s identity is not known, Palm Springs police said.
Dr Maher Abdallah, who runs the American Reproductive Centers clinic, told the Associated Press his facility was damaged but all staff were safe and accounted for.
The explosion damaged the office space where the practice conducts patient consultations, but the IVF lab and stored embryos were unharmed, he added.
“I really have no clue what happened,” he said. “Thank God today happened to be a day that we have no patients.”
Debris covers the ground after the explosion. Pic: ABC7 Los Angeles/AP
In a statement posted on Facebook the clinic said it was “heartbroken” to learn someone died in the explosion and added: “Our deepest condolences go out to the individuals and families affected.”
It continued: “Our mission has always been to help build families, and in times like these, we are reminded of just how fragile and precious life is.
“In the face of this tragedy, we remain committed to creating hope – because we believe that healing begins with community, compassion, and care.
The clinic will be fully operational on Monday, it added.
“This moment has shaken us – but it has not stopped us. We will continue to serve with strength, love, and the hope that brings new life into the world,” the statement concluded.
Pic: ABC7 Los Angeles/AP
The Palm Springs city government said in a post on Facebook that the explosion happened on North Indian Canyon Drive, near East Tachevah Drive, before 11am local time (6pm GMT).
A burned-out car can be seen in a parking lot behind the building in aerial footage.
The blast caved in the clinic’s roof and blew debris across four lanes of the road.
Another person said he was inside a cannabis dispensary nearby when he felt a massive explosion.
Nima Tabrizi said: “The building just shook, and we go outside and there’s massive cloud smoke.”
Investigators from the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives are travelling to the scene to help assess what happened.
California governor Gavin Newsom has been briefed on the explosion, his press office said.
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