Science
How Death Valley National Park tries to keep visitors alive amid record heat
As temperatures swelled to 128 degrees, Death Valley National Park rangers got a call that a group of six motorcyclists were in distress. All available medics rushed to the scene, and rangers dispatched the park’s two ambulances.
It was an “all-hands-on-deck call,” said Spencer Solomon, Death Valley National Park’s emergency medical coordinator. The superheated air was too thin for an emergency helicopter to respond, but the team requested mutual aid from nearby fire departments.
They arrived Saturday to find one motorcyclist unresponsive, and medics labored unsuccessfully to resuscitate him. Another rider who had fallen unconscious was loaded into an ambulance, where emergency medical technicians attempted to rapidly cool the victim with ice as they transported him to an intensive care unit in Las Vegas. The four other motorcyclists were treated at the site and released.
With record heat blanketing California and much of the West recently, Death Valley has hit at least 125 degrees every day since the Fourth of July, and that streak isn’t likely to change until the weekend, according to the National Weather Service.
Tourist Dave Hsu, left, feigns a chill as friend Tom Black takes a photograph at the Furnace Creek Visitor Center’s digital thermometer.
Extreme heat is both one of Death Valley’s greatest intrigues and its most serious safety concern. It’s not uncommon for a few people to die in the park from heatstroke in any given summer.
Located 200 feet below sea level and surrounded by steep, towering mountain ranges that trap heat, the valley is consistently among the hottest places on Earth.
In the summer, international travelers often schedule their trips without considering the weather. (All six of the men who fell victim to extreme temperatures near Badwater Basin on Saturday were from Germany.)
But even Southern California residents who are familiar with Death Valley’s hellish reputation will trek to the park just to experience the otherworldly heat.
“In L.A., people said, ‘No, don’t go out there; you’re crazy,’” said Nick Van Schaick, who visited the park early this week. He had spent the night in the nearby town of Beatty, Nev., then drove into the park at the crack of dawn Tuesday. “I don’t know. … There’s something compelling about this landscape.”
Visitors to Death Valley National Park drive in and out of the park on Highway 190 through the Panamint Valley, where temperatures were as high as 125 degrees recently.
Virtually all heat-related deaths are preventable, experts say, but what makes heat so dangerous is that it sneaks up on its victims.
The risk of Death Valley’s heat seems painfully obvious. It’s hard to miss the dozens of “Heat kills” signs throughout the park, and stepping out of a car there for the first time feels like sticking your face in an opened oven. Within seconds, your eyes begin to burn and your lips crack. Your skin feels completely dry — even though you’re sweating profusely, the sweat evaporates almost instantaneously.
But one of the first symptoms people experience as their core temperature begins to rise is confusion, which can inhibit a person’s ability to recognize that something is wrong or understand how to save themselves.
Studies have also shown that although almost everyone understands how to prevent heat illness, too few take action to protect themselves. That’s in part because many think they are uniquely able to handle the heat when in fact they are not. In 2021, a Death Valley visitor died from heat just days after another visitor had died on the same trail.
It’s a one-two punch. Hikers ignore the symptoms of heat exhaustion because they’re excited to hike or have nowhere else to go, said Bill Hanson, an instructor for Wilderness Medical Associates International and a flight paramedic in central Texas who specializes in heat-related emergencies. Then, “when a person reaches a pretty profound state of heat exhaustion — which by itself is not a lethal condition — and they’re still in that environment, the likelihood they’ll make the right decisions and reverse the process … is reduced because they have a reduced ability to make good decisions at all.”
One of the reasons that humans are quickly overcome by extreme heat is that there’s only one route for heat to exit the body. Blood carries heat from our core to our skin, and, when the breeze is too hot to carry heat away from us, the body can release it only through the evaporation of sweat. Any of that sweat that drips to the ground or is wiped off the face is a missed opportunity to cool down.
Visitors walk out onto the salt flats at Badwater Basin, taking advantage of cooler morning temperatures on a day when the mercury would rise as high as 125 degrees in Death Valley National Park.
In Death Valley, the air is so dry that sweat evaporates very easily, unlike in humid climates where the atmosphere contains more moisture. With profuse sweating, however, dehydration comes quickly. The park recommends visitors do their best to replenish lost water and drink at least a gallon a day if they’re spending time doing any physical activity outside.
But sweating and constant hydration will work only to a point.
“A 130-degree environment … there’s going to be a limited shelf life on a human body’s ability to exist in that environment without some technological support,” Hanson said.
Because of this, the park says to never hike after 10 a.m. during periods of extreme heat and recommends never straying more than five minutes away from the nearest air conditioning, whether it be in a car or building.
In the heat, sticking in groups can also save lives. While it might be difficult for a confused heat illness victim to recognize the symptoms or remember how to save themselves, friends can spot problems. In general, if you struggle to do anything that is normally easy for you — physically or mentally — stop to rest and seek cooler conditions immediately.
Muscle cramps are often the first sign the body is struggling to stay cool. They’re probably caused by a toxic concoction of dehydration, muscle fatigue and a lack of electrolytes like sodium, which are essential for chauffeuring water and nutrients throughout the body. Cramps are a sign that the body’s process for dumping heat is under stress.
Death Valley National Park visitor Steffi Meister, from Switzerland, photographs the landscape at Zabriskie Point where temperatures were as high as 125 degrees recently.
As the body struggles, heat exhaustion starts to set in. The brain, heart and other organs become tired from working to maintain the body’s typical temperature of 98 degrees. As the body passes 101 degrees, victims can start experiencing dizziness, confusion and headaches. It’s not uncommon for them to vomit, feel weak or even faint.
As the body passes 104 degrees, the entire central nervous system — responsible for regulating heat in the first place — can no longer handle the stress of the high temperatures. It starts to shut down. The victim might get so confused and disoriented that they no longer make sense. They might not even be able to communicate. They can start to have seizures and fall into a coma.
“To me, as a park medic, if you’re unresponsive, you’re going to the hospital,” Solomon said, “because your brain is essentially cooking.”
At this point, the heat has done irreversible damage that can leave the victim disabled for years to come. If internal temperatures don’t fall quickly, death becomes a very real possibility. Organs can fail within hours, killing the victim, even after their temperature starts to drop.
Heat illness can come on within just minutes or take hours to develop. “There’s kind of a weird phenomenon where there’s two times of day where we’ll get 911 calls for people who have fallen ill” due to heat sickness, Solomon said.
One is in the middle of the afternoon, when the heat is at its worst. The other is near 11 p.m. — visitors will feel OK during the day, but get increasingly dehydrated as they continue to exert themselves. “Then, they check into their hotel room and fall ill,” Solomon said.
In some extreme cases, heatstroke can overwhelm a person so fast that muscle cramps and other symptoms of heat exhaustion don’t have time to show. The Death Valley emergency response team typically gets about two or three heat illness calls per week in the summer, with visitors experiencing symptoms across the spectrum from mild fatigue to loss of consciousness.
Heatstroke experts overwhelmingly agree on the most effective treatment: cooling the patient as fast as possible.
“The key to survival is getting their body temperature under 104 within 30 minutes of the presentation of the condition,” said Douglas Casa, a professor of kinesiology at the University of Connecticut and the chief executive of the Korey Stringer Institute, a leading voice in treating heatstrokes. “It’s 100% survivability if you do that, which is amazing because there’s not too many life-threatening emergencies in the world that have 100% survivability if treated correctly.”
The fastest way to cool a patient is a cool ice bath, experts say. Hanson said his team in Texas will fly an ice bath on a helicopter and cool the victim in the middle of the desert until their temperature stabilizes before the medics even transport them.
However, in Death Valley, getting an ice bath to victims can be nearly impossible. The hot air is so thin that the team can’t fly helicopters. Instead, they bring a body bag and cool the victim inside with ice and cool towels as they’re transported via ambulance.
Although emergencies are regular, the park says they are preventable, and if people follow park guidance, they can experience the heat safely.
“It really is a reason why some people come to visit — because this is one of the few places on Earth where you can feel what that level of heat feels like,” said supervisory park ranger Jennette Jurado. “It’s our job as park rangers to do our very best to make sure people can have these experiences and then go home safely at the end of the day and remember these experiences.”
Visitors take a late-afternoon swim in the pool at Furnace Creek, where temperatures lingered in the 120s inside Death Valley National Park.
For Jurado, a safe visit looks like taking refuge in air conditioning during the hottest parts of the day and experiencing the heat in short five-minute intervals. The vast majority of visitors take this approach. If they hike at all, it’s early in the morning, and the car never leaves their sight. The rest of the day, they spend hanging at the hotel or by the pool — or they leave the park.
Although it might be possible for someone to — wrongly — convince themselves that a 90-degree heat wave in the city won’t affect them personally, it’s much harder to do that in a Death Valley heat wave.
Ironically, this makes Jurado worry more about cooler days in the park, when visitors may not be most on guard. When hikers died within days of each other a few years back, it was an unseasonably cool 105 degrees in the park.
“It’s that level of heat where people are like, ‘Oh, it’s not Death Valley hot, I can hike longer — I can take more risks,’” Jurado said.
Science
Diablo Canyon clears last California permit hurdle to keep running
Central Coast Water authorities approved waste discharge permits for Diablo Canyon nuclear plant Thursday, making it nearly certain it will remain running through 2030, and potentially through 2045.
The Pacific Gas & Electric-owned plant was originally supposed to shut down in 2025, but lawmakers extended that deadline by five years in 2022, fearing power shortages if a plant that provides about 9 percent the state’s electricity were to shut off.
In December, Diablo Canyon received a key permit from the California Coastal Commission through an agreement that involved PG&E giving up about 12,000 acres of nearby land for conservation in exchange for the loss of marine life caused by the plant’s operations.
Today’s 6-0 vote by the Central Coast Regional Water Board approved PG&E’s plans to limit discharges of pollutants into the water and continue to run its “once-through cooling system.” The cooling technology flushes ocean water through the plant to absorb heat and discharges it, killing what the Coastal Commission estimated to be two billion fish each year.
The board also granted the plant a certification under the Clean Water Act, the last state regulatory hurdle the facility needed to clear before the federal Nuclear Regulatory Commission (NRC) is allowed to renew its permit through 2045.
The new regional water board permit made several changes since the last one was issued in 1990. One was a first-time limit on the chemical tributyltin-10, a toxic, internationally-banned compound added to paint to prevent organisms from growing on ship hulls.
Additional changes stemmed from a 2025 Supreme Court ruling that said if pollutant permits like this one impose specific water quality requirements, they must also specify how to meet them.
The plant’s biggest water quality impact is the heated water it discharges into the ocean, and that part of the permit remains unchanged. Radioactive waste from the plant is regulated not by the state but by the NRC.
California state law only allows the plant to remain open to 2030, but some lawmakers and regulators have already expressed interest in another extension given growing electricity demand and the plant’s role in providing carbon-free power to the grid.
Some board members raised concerns about granting a certification that would allow the NRC to reauthorize the plant’s permits through 2045.
“There’s every reason to think the California entities responsible for making the decision about continuing operation, namely the California [Independent System Operator] and the Energy Commission, all of them are sort of leaning toward continuing to operate this facility,” said boardmember Dominic Roques. “I’d like us to be consistent with state law at least, and imply that we are consistent with ending operation at five years.”
Other board members noted that regulators could revisit the permits in five years or sooner if state and federal laws changes, and the board ultimately approved the permit.
Science
Deadly bird flu found in California elephant seals for the first time
The H5N1 bird flu virus that devastated South American elephant seal populations has been confirmed in seals at California’s Año Nuevo State Park, researchers from UC Davis and UC Santa Cruz announced Wednesday.
The virus has ravaged wild, commercial and domestic animals across the globe and was found last week in seven weaned pups. The confirmation came from the U.S. Department of Agriculture’s National Veterinary Services Laboratory in Ames, Iowa.
“This is exceptionally rapid detection of an outbreak in free-ranging marine mammals,” said Professor Christine Johnson, director of the Institute for Pandemic Insights at UC Davis’ Weill School of Veterinary Medicine. “We have most likely identified the very first cases here because of coordinated teams that have been on high alert with active surveillance for this disease for some time.”
Since last week, when researchers began noticing neurological and respoiratory signs of the disease in some animals, 30 seals have died, said Roxanne Beltran, a professor of ecology and evolutionary biology at UC Santa Cruz. Twenty-nine were weaned pups and the other was an adult male. The team has so far confirmed the virus in only seven of the dead pups.
Infected animals often have tremors convulsions, seizures and muscle weakness, Johnson said.
Beltran said teams from UC Santa Cruz, UC Davis and California State Parks monitor the animals 260 days of the year, “including every day from December 15 to March 1” when the animals typically come ashore to breed, give birth and nurse.
The concerning behavior and deaths were first noticed Feb. 19.
“This is one of the most well-studied elephant seal colonies on the planet,” she said. “We know the seals so well that it’s very obvious to us when something is abnormal. And so my team was out that morning and we observed abnormal behaviors in seals and increased mortality that we had not seen the day before in those exact same locations. So we were very confident that we caught the beginning of this outbreak.”
In late 2022, the virus decimated southern elephant seal populations in South America and several sub-Antarctic Islands. At some colonies in Argentina, 97% of pups died, while on South Georgia Island, researchers reported a 47% decline in breeding females between 2022 and 2024. Researchers believe tens of thousands of animals died.
More than 30,000 sea lions in Peru and Chile died between 2022 and 2024. In Argentina, roughly 1,300 sea lions and fur seals perished.
At the time, researchers were not sure why northern Pacific populations were not infected, but suspected previous or milder strains of the virus conferred some immunity.
The virus is better known in the U.S. for sweeping through the nation’s dairy herds, where it infected dozens of dairy workers, millions of cows and thousands of wild, feral and domestic mammals. It’s also been found in wild birds and killed millions of commercial chickens, geese and ducks.
Two Americans have died from the virus since 2024, and 71 have been infected. The vast majority were dairy or commercial poultry workers. One death was that of a Louisiana man who had underlying conditions and was believed to have been exposed via backyard poultry or wild birds.
Scientists at UC Santa Cruz and UC Davis increased their surveillance of the elephant seals in Año Nuevo in recent years. The catastrophic effect of the disease prompted worry that it would spread to California elephant seals, said Beltran, whose lab leads UC Santa Cruz’s northern elephant seal research program at Año Nuevo.
Johnson, the UC Davis researcher, said the team has been working with stranding networks across the Pacific region for several years — sampling the tissue of birds, elephant seals and other marine mammals. They have not seen the virus in other California marine mammals. Two previous outbreaks of bird flu in U.S. marine mammals occurred in Maine in 2022 and Washington in 2023, affecting gray and harbor seals.
The virus in the animals has not yet been fully sequenced, so it’s unclear how the animals were exposed.
“We think the transmission is actually from dead and dying sea birds” living among the sea lions, Johnson said. “But we’ll certainly be investigating if there’s any mammal-to-mammal transmission.”
Genetic sequencing from southern elephant seal populations in Argentina suggested that version of the virus had acquired mutations that allowed it to pass between mammals.
The H5N1 virus was first detected in geese in China in 1996. Since then it has spread across the globe, reaching North America in 2021. The only continent where it has not been detected is Oceania.
Año Nuevo State Park, just north of Santa Cruz, is home to a colony of some 5,000 elephant seals during the winter breeding season. About 1,350 seals were on the beach when the outbreak began. Other large California colonies are located at Piedras Blancas and Point Reyes National Sea Shore. Most of those animals — roughly 900 — are weaned pups.
It’s “important to keep this in context. So far, avian influenza has affected only a small proportion of the weaned at this time, and there are still thousands of apparently healthy animals in the population,” Beltran said in a press conference.
Public access to the park has been closed and guided elephant seal tours canceled.
Health and wildlife officials urge beachgoers to keep a safe distance from wildlife and keep dogs leashed because the virus is contagious.
Science
When slowing down can save a life: Training L.A. law enforcement to understand autism
Kate Movius moved among a roomful of Los Angeles County sheriff’s deputies, passing out a pop trivia quiz and paper prism glasses.
She told them to put on the vision-distorting glasses, and to write with their nondominant hand. As they filled out the tests, Movius moved about the City of Industry classroom pounding abruptly on tables. Then came the cowbell. An aide flashed the overhead lights on and off at random. The goal was to help the deputies understand the feeling of sensory overwhelm, which many autistic people experience when incoming stimulation exceeds their capacity to process.
“So what can you do to assist somebody, or de-escalate somebody, or get information from someone who suffers from a sensory disorder?” Movius asked the rattled crowd afterward. “We can minimize sensory input. … That might be the difference between them being able to stay calm and them taking off.”
Movius, founder of the consultancy Autism Interaction Solutions, is one of a growing number of people around the U.S. working to teach law enforcement agencies to recognize autistic behaviors and ensure that encounters between neurodevelopmentally disabled people and law enforcement end safely.
She and City of Industry Mayor Cory Moss later passed out bags filled with tools donated by the city to aid interactions: a pair of noise-damping headphones to decrease auditory input, a whiteboard, a set of communication cards with words and images to point to, fidget toys to calm and distract.
“The thing about autistic behavior when it comes to law enforcement is a lot of it may look suspicious, and a lot of it may feel very disrespectful,” said Movius, who is also the parent of an autistic 25-year-old man. Responding officers, she said, “are not coming in thinking, ‘Could this be a developmentally disabled person?’ I would love for them to have that in the back of their minds.”
A sheriff’s deputy reads a pamphlet on autism during the training program.
(Genaro Molina / Los Angeles Times)
Autism spectrum disorder is a developmental condition that manifests differently in nearly every person who has it. Symptoms cluster around difficulties in communication, social interaction and sensory processing.
An autistic person stopped by police might hold the officer’s gaze intensely or not look at them at all. They may repeat a phrase from a movie, repeat the officer’s question or temporarily lose their ability to speak. They might flee.
All are common involuntary responses for an autistic person in a stressful situation, which a sudden encounter with law enforcement almost invariably is. To someone unfamiliar with the condition, all could be mistaken for intoxication, defiance or guilt.
Autism rates in the U.S. have increased nearly fivefold since the Centers for Disease Control began tracking diagnoses in 2000, a rise experts attribute to broadening diagnostic criteria and better efforts to identify children who have the condition.
The CDC now estimates that 1 in 31 U.S. 8-year-olds is autistic. In California, the rate is closer to 1 in 22 children.
As diverse as the autistic population is, people across the spectrum are more likely to be stopped by law enforcement than neurotypical peers.
About 15% of all people in the U.S. ages 18 to 24 have been stopped by police at some point in their lives, according to federal data. While the government doesn’t track encounters for disabled people specifically, a separate study found that 20% of autistic people ages 21 to 25 have been stopped, often after a report or officer observation of a person behaving unusually.
Some of these encounters have ended in tragedy.
In 2021, Los Angeles County sheriff’s deputies shot and permanently paralyzed a deaf autistic man after family members called 911 for help getting him to a hospital.
Isaias Cervantes, 25, had become distressed about a shopping trip and started pushing his mother, his family’s attorney said at the time. He resisted as two deputies attempted to handcuff him and one of the deputies shot him, according to a county report.
In 2024, Ryan Gainer’s family called 911 for support when the 15-year-old became agitated. Responding San Bernardino County sheriff‘s deputies shot and killed him outside his Apple Valley home.
Last year, police in Pocatello, Idaho, shot Victor Perez, 17, through a chain-link fence after the nonspeaking teenager did not heed their shouted commands. He died from his injuries in April.
Sheriff’s deputies take a trivia quiz using their non-writing hands, while wearing vision-distorting glasses, as Kate Movius, standing left, and Industry Mayor Cory Moss, right, ring cowbells. The idea was to help them understand the sensory overwhelm some autistic people experience.
(Genaro Molina / Los Angeles Times)
As early as 2001, the FBI published a bulletin on police officers’ need to adjust their approach when interacting with autistic people.
“Officers should not interpret an autistic individual’s failure to respond to orders or questions as a lack of cooperation or as a reason for increased force,” the bulletin stated. “They also need to recognize that individuals with autism often confess to crimes that they did not commit or may respond to the last choice in a sequence presented in a question.”
But a review of multiple studies last year by Chapman University researchers found that while up to 60% of officers have been on a call involving an autistic person, only 5% to 40% had received any training on autism.
In response, universities, nonprofits and private consultants across the U.S. have developed curricula for law enforcement on how to recognize autistic behaviors and adapt accordingly.
The primary goal, Movius told deputies at November’s training session, is to slow interactions down to the greatest extent possible. Many autistic people require additional time to process auditory input and verbal responses, particularly in unfamiliar circumstances.
If at all possible, Movius said, wait 20 seconds for a response after asking a question. It may feel unnaturally long, she acknowledged. But every additional question or instruction fired in that time — what’s your name? Did you hear me? Look at me. What’s your name? — just decreases the likelihood that a person struggling to process will be able to respond at all.
Moss’ son, Brayden, then 17, was one of several teenagers and young adults with autism who spoke or wrote statements to be read to the deputies. The diversity of their speech patterns and physical mannerisms showed the breadth of the spectrum. Some were fluently verbal, while others communicated through signs and notes.
“This population is so diverse. It is so complicated. But if there’s anything that we can show [deputies] in here that will make them stop and think, ‘Hey, what if this is autism?’ … it is saving lives,” Moss said.
Mayor Cory Moss, left, and Kate Movius hug at the end of the training program last November. Movius started Autism Interaction Solutions after her son was born with profound autism.
(Genaro Molina / Los Angeles Times)
Some disability advocates cautioned that it takes more than isolated training sessions to ensure encounters end safely.
Judy Mark, co-founder and president of the nonprofit Disability Voices United, says she trained thousands of officers on safe autism interactions but stopped after Cervantes’ shooting. She now urges families concerned about an autistic child’s safety to call an ambulance rather than law enforcement.
“I have significant concern about these training sessions,” Mark said. “People get comfort from it, and the Sheriff’s Department can check the box.”
While not a panacea, supporters argue that a brief course is better than no preparation at all. Some years ago, Movius received a letter from a man whose profoundly autistic son slipped away as the family loaded their car at the beach. He opened the unlocked door of a police vehicle, climbed into the back and began to flail in distress.
Though surprised, the officer seated at the wheel de-escalated the situation and helped the young man find his family, the father wrote to Movius. He had just been to her training.
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