The thermometer learn 121 levels Fahrenheit when 71-year-old Steve Curry collapsed exterior a restroom in Dying Valley Nationwide Park final summer time. Curry, who’d reportedly been mountaineering on a close-by path in Golden Canyon, was simply attempting to make it again to his automobile. The Nationwide Park Service and the Inyo County Sheriff’s Workplace shortly responded to the scene. They tried to revive him with an exterior defibrillator, nevertheless it was not sufficient, and the medical helicopter that would’ve transported him to a hospital wasn’t in a position to take off due to the acute warmth. It was too late.

One of many final pictures of Curry alive, taken by a Los Angeles Occasions workforce on the day he died, reveals him sitting below a tiny patch of shade, a big solar hat on his head and his face smeared with sunscreen. When requested by the Occasions why he was mountaineering that day, the skilled hiker replied, “Why not?”

This summer time, tens of millions of holiday makers will descend on nationwide parks. They might not notice that excessive warmth just isn’t solely making the outside riskier, but in addition making rescuing these in peril way more troublesome. Park rangers in Dying Valley reply to overheated guests a number of instances per week in the summertime months, and in recent times, warmth has been a think about one to a few deaths there a yr. Excessive temperatures can result in warmth exhaustion and heatstroke—situations that may necessitate a search-and-rescue operation or an air ambulance, which might attain you faster than an ambulance on the bottom. However temperatures above 120 levels Fahrenheit (a standard summer time incidence in Dying Valley) make the air too “skinny” to provide an ambulance helicopter the elevate it must get off the bottom and safely keep there.

And not using a helicopter, rescuers on the bottom—braving the identical blistering warmth—are the one possibility. Though park rangers need to assist, park managers is not going to permit them to place their lives in peril for prolonged search-and-rescue operations in excessive warmth. On-foot searches for individuals whose location is unknown are much less prone to occur when temperatures are 120 levels or hotter in Dying Valley, although park rangers will reply to medical emergencies that they will safely get to (in developed areas and alongside roads, for instance), even in excessive temperatures.

These rescue challenges are prone to grow to be increasingly widespread at quite a few nationwide parks. A few of the hottest—Dying Valley and Joshua Tree in California, Huge Bend in Texas, Grand Canyon in Arizona—are in desert areas the place summer time is simply naturally, properly, sizzling. Dying Valley as soon as reached an air temperature of 134 levels, on the aptly named Furnace Creek in 1913.

However even the recent locations are getting hotter. In 2021, Dying Valley broke its report for many consecutive days over 125 levels; projections from a report ready for the Nationwide Local weather Evaluation present that temperatures throughout the southwestern United States will proceed to heat above earlier averages all through the remainder of the century. Nationwide parks (partly due to their places in Alaska, at excessive elevations, and within the arid Southwest) are disproportionately affected by local weather change—from 1895 to 2010, their temperatures elevated at double the speed of the remainder of the nation, in keeping with analysis revealed in 2018. Final June and July, at the very least 5 individuals—together with Curry—died in nationwide parks within the Southwest. Warmth was a contributing think about all 5 deaths.

However the warmth doesn’t appear to be deterring guests. In reality, record-breaking temperatures may even be a draw. In Dying Valley, many guests are wanting to get a photograph in entrance of the park’s big digital thermometer with its eye-popping numbers within the triple digits.

Visiting a nationwide park is a quintessential American pastime, significantly in the summertime. However in recent times, the expertise of visiting a park, and different out of doors locations, has modified alongside the local weather. A research led by the NPS predicted a big uptick in heat-related sickness for its guests within the coming years. “Individuals ought to know that warmth can kill, and it does,” Abby Wines, a Dying Valley Nationwide Park spokesperson, advised me.

Rangers and volunteers within the Grand Canyon, the place hikers begin the day taking place and should exert themselves extra on the way in which again up, when temperatures are larger, have since 1997 carried out a proactive method. A “preventive” search-and-rescue workforce stops individuals earlier than they’ve reached the canyon’s backside, and checks on their water provides, educates them on the day’s forecast, and encourages a U-turn if essential.

Hikers may take their very own precautions to get forward of an emergency. Suggestions are commonsense and simple to observe wherever you’re: Drink water, shorten your actions, put on a hat, eat salty snacks, and search out shady trails if doable. Don’t low cost temperatures of 105 or 110 levels, Wines warned, regardless that these numbers are “not so sizzling” by Dying Valley requirements. Low humidity in these dry locations means your sweat evaporates off your physique because it’s being created, eliminating a well-known sign of exertion. And regulate your watch: Climbing low-elevation trails after 10 a.m., and particularly from 3 to five p.m., is discouraged in locations like Dying Valley.

Cease indicators on the Golden Canyon trailhead, the place Curry hiked the day of his dying, warn guests of maximum warmth hazard in 9 totally different languages. One other signal reveals a helicopter with a black line slashed by means of it, warning {that a} rescue could also be hours away. Once you see these indicators, take heed.