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DES MOINES, Iowa — Paul Grinvalds has completed 114 marathons in all 50 states, but he still wilts when he races in temperatures beyond 60 degrees.

It’s the same for most runners, as the body can’t cool down during exertion, and heat makes that even harder.

“One thing about marathoners is typically we’re kind of stubborn,” said Grinvalds, 68, from West Des Moines, Iowa, who finds even temperatures in the 50s a bit warm. “So if we have a goal and it’s hot, a lot of times we’re still going to try to do that goal, which is just stupid because you’re almost guaranteed to have a very painful experience.”

Such an experience can also be dangerous, a reality that marathon organizers are having to confront as climate change, caused mostly by the burning of fuels like coal and gasoline, pushes temperatures up. To improve the chances of having the 26.2-mile race in cooler weather, organizers are shifting race dates, starting earlier and even giving options for participants to cut their runs short.

Starting in 2027, the Twin Cities Marathon in Minneapolis-St. Paul will shift its more than 40-year tradition of holding the race on the first Sunday in October to later in the month. That decision comes after cancellation of the marathon in 2023 because of record heat and humidity, and starting temperatures near 70 for the 2025 race.

Organizers of the Sioux Falls, South Dakota, marathon last year similarly moved their annual race from August to September after canceling the 2024 race due to hot conditions. And other races, including the Air Force Marathon in Dayton, Ohio, the Little Rock Marathon in Arkansas, and the Long Beach Marathon in Southern California, all moved their start times to earlier in the morning in search of cooler temperatures.

In Los Angeles in March, warm conditions prompted race organizers to give runners the option of stopping after 18 miles and still receiving a finishers medal. Less than 5% of participants opted for the shorter finish and only 14 of roughly 27,000 runners were treated at a hospital, with all released the same day. Still, the move led to some online derision.

“We welcome the feedback and it’s certainly something that caused a lot of discussion, but when we’re grading ourselves on it, it has to do with how safe our runners were on the day of the event and we’re very happy with the outcome,” said Meg Treat, a spokesperson for the marathon.

At the Twin Cities Marathon, race director Ed Whetham called the decision to cancel the 2023 marathon “devastating” for runners and the organization. Whetham said it prompted an extensive analysis of weather patterns that resulted in the decision to permanently delay the race by a couple weeks.

That analysis showed that by holding the race later in October, runners would have a far greater chance of optimal conditions. Given that snow sometimes falls in the Twin Cities in late October, there is a greater chance of chilly conditions, but Whetham said, “We’ll take a 39-degree start over a 70-degree start.”

Temperatures are expected to keep rising

The contiguous U.S. just had its warmest July ever recorded, and the Earth had its hottest year on record in 2024. The World Meteorological Organization forecasts that between 2025 and 2030 the Earth’s average global temperature will likely rise by more than 2.7 compared to the 1800s.

The warming is already making conditions worse for most marathons, according to a study of 221 races by the climate research group Climate Central. By 2045, optimal conditions for recreational runners — in the low 40s — would be less likely at 46 of the 51 U.S. marathons analyzed.

“The ability to go outside, to exercise, to take advantage of your human body and being healthy, that’s something that’s getting challenged by climate change,” said Andy Pershing, who led the Climate Central research.

Jessica Murfree leads a University of North Carolina-Chapel Hill lab studying climate change’s effect on sports. She said organizers of marathons, bicycle races and other competitions — from tennis to college football — increasingly must consider changing event dates and times and adopting other safety measures, as climate change makes the weather hotter and more volatile.

Murfree said the concern extends beyond organized sports to whether people can even get outside on increasingly warm days, pushing people to exercise indoors or opt for activities like swimming.

“If we can’t walk, if we can’t exercise or go for runs, it’s too hot, can we still stay physically active while remaining cool?” she asked.

Marathons are especially hard in warm weather

Any kind of exercising in the heat can be challenging, but running a marathon in warm, humid conditions is especially difficult because it’s hard to prevent overheating when a person keeps pushing themselves for hours. And the faster a person goes, the more heat their body produces.

Chris Minson, a University of Oregon professor who researches how people can adapt to extreme heat and other environmental conditions, said the optimum temperature to run a marathon is about 50 degrees. As the temperature creeps into the upper 50s and 60s, the body has a tougher time supplying blood to muscles while also keeping the body cool.

“As you get to warmer temperatures you end up having a bigger competition between blood supplying your muscles to keep running, to keep nutrition going, and blood flow to your skin for thermal regulation,” Minson said.

Minson said it takes a tremendous amount of energy to run quickly. But of that energy, only about 25% is used to move the body forward. The rest goes to deal with the heat that is created by rapid movement.

Even worse than high temperatures is high humidity, which prevents sweat from evaporating and cooling the body.

Minson adds, though, that by regularly exercising in warm weather, people can acclimate to high temperatures and perform better in the heat, though likely not as well as they would in cooler conditions. Athletes who acclimate to high heat also can perform better in lower temperatures than if they hadn’t exercised in warm weather, he said.

Some athletes like John Seals even run in the midday heat and endure a sauna after a workout to acclimate their bodies. That all forms part of Seals’ training for an annual 135-mile ultramarathon held in July in Death Valley, California.

“We had a heat wave this week and for me, that’s a great thing,” said Seals, of West Des Moines.

Still, running in the heat can be dangerous without taking precautions.

Douglas Casa, a kinesiology professor who leads the Korey Stringer Institute, which studies sudden deaths in sports, said the Twin Cities Marathon’s change was prudent, especially considering the way in which many runners approach races.

“If someone was smart enough to say, ‘OK, it’s a little hotter today than usual, I’m going to run a 7 minute mile instead of a 6:30 mile,’ then they won’t get any hotter than normal,” Casa said. “It’s just that runners are sometimes very locked into what they normally do and what their goals are.”

McFetridge writes for the Associated Press. The Associated Press’ climate and environmental coverage receives financial support from multiple private foundations. AP is solely responsible for all content. Find AP’s standards for working with philanthropies, a list of supporters and funded coverage areas at AP.org.

This month’s LA Jazz Festival was slated to be one of the largest concerts in Los Angeles history.

With dozens of performances spread throughout every City Council district, organizers hoped the shows would draw 250,000 attendees and inaugurate the city as a home for jazz events on par with New Orleans and Montreal.

Those hopes will have to wait, as organizers announced the cancellation and postponement of the festival on Friday, including its main show Aug. 22-23 on Dockweiler Beach.

“Due to significant, unanticipated last-minute public safety and municipal costs associated with the final permitting of the On The Beach Festival, we have reached the decision to unfortunately postpone this year’s inaugural LA Jazz Festival,” organizer Martin Ludlow said in a statement to the Times. “Although this decision was an extremely difficult one to reach, our commitment to the audiences and artists participating in the festival is to have a first-class experience worthy of the great legacy of Jazz and our great city. We were encouraged by the enthusiastic support of the artists on the bill, the fans and our sponsors for this inaugural event, and we look forward to presenting all of the components of this incredible cultural opportunity for Los Angeles and the world in 2027 and beyond.”

John Legend, Janelle Monáe, Charlie Wilson, Parliament Funkadelic and Raphael Saadiq were booked to headline the main show.

“We are so grateful to all the artists–from our headliners to our musicians in the parks, many of whom went above and beyond to make this affordable to the community,” Ludlow added. “All current ticket holders for LA Jazz Festival events will be refunded in full within 30 days. We apologize deeply for this situation and vow to make this right over time.”

LA Jazz Festival was a major project for Ludlow, a former Los Angeles City Council member turned music promoter and community activist after pleading guilty to misappropriating funds in 2006.

Ludlow announced the show in a splashy speech on the steps of City Hall in February, flanked by Mayor Karen Bass and other civic leaders. “During this journey, you can only imagine there’s a lot of highs and a lot of lows,” Ludlow said then. “When you have those lows, you want a friend that really can lift you up.”

Back in February, Ludlow described the mission of LA Jazz Festival with a civil rights-inspired fervor, saying that “This festival is intended to lift up our ancestors that came to this country in bondage, terrorized, brutalized. It’s also about celebrating the end to those last bastions of Jim Crow racism, the days we were denied access to public drinking fountains, public swimming pools and public beaches. From the beginning of this journey, we’ve been very intentional about telling the narrative of that human rights struggle called Jazz.”

DEIR AL BALAH, Gaza Strip — An Israeli strike on Gaza just before the kickoff of the Egypt-Argentina World Cup match killed a top Palestinian aid official who helped organize public screenings of the game across the enclave, according to local health officials.

The blast turned what was supposed to be a moment of celebration — the live screening of a potential Argentina upset by an Arab team — into a reminder of how the near-daily Israeli strikes across Gaza are continuing to kill civilians despite a truce reached in October.

The bomb hit a car in the Sabra neighborhood of Gaza City at dusk Tuesday, killing passersby Mohamed al-Wahidi, an official at the Egyptian Committee in Gaza, 10-year-old boy Hamza al-Deri and his 8-year-old brother, Fari. Ahmed Daghmush, 33, the driver of the car, was also killed. That’s according to Dr. Mohamed Abu Selmiya, the director of Shifa Hospital, which received the four bodies.

The Israeli military said al-Wahidi, who helped organize the soccer screenings, was not a target of the strike. It said the strike was aiming for a Hamas militant, and it was checking if Daghmush was the target.

Daghmush is a taxi driver not known to be affiliated with any militant group, Abu Selmiya said.

An Israeli strike hit the same street half an hour earlier, causing no casualties.

The committee for which al-Wahidi worked is the relief arm of the Egyptian government, which provides food, shelters and other assistance to Palestinians in Gaza. The committee organized the initiative to put up screens across Gaza to watch soccer matches, it said.

Many in the Palestinian diaspora live across the border in Egypt, which was a key mediator of the Israel-Hamas ceasefire.

Team Egypt’s Gaza fanbase has only grown since the start of the tournament, as coach Hossam Hassan has spotlighted the plight of the Palestinian people in press briefings and on the pitch. He dedicated his team’s victory over Australia on Friday to both Egyptians and Palestinians and waved a Palestinian flag on the pitch.

In a Monday briefing before the match against Argentina, Hassan urged the world to do more for the Palestinian people.

“I urge you, I urge all media officers, all athletes worldwide, regardless of their identities, maybe we can convey a collective message that is as follows, let the Palestinian people be, let them exist, let them live a life of their own,” he said.

Israel’s military says its strikes target militants and it regrets harm to civilians. At least 1,084 people, including 258 children, have been killed since the truce took effect in October. Five Israeli soldiers have been killed in that time.

The Palestinian death toll from the Israel-Hamas war stands at 73,110, according to the Gaza Health Ministry, which is part of the Hamas-led government and is staffed by medical professionals who maintain detailed records viewed as generally reliable by United Nations agencies and independent experts. It does not distinguish between civilians and militants but says women and children make up around half of all fatalities.

The war began when Hamas-led militants attacked southern Israel on Oct. 7, 2023, killing around 1,200 people and taking 251 others hostage.

Shurafa, Magdy and Frankel write for the Associated Press. Magdy reported from Cairo and Frankel from Jerusalem.

WASHINGTON — Festivities commemorating the 250th anniversary of American independence from Great Britain kick into higher gear across the United States on Friday as celebrations are balanced with efforts to stay safe as much of the country bakes under extreme heat.

President Trump will travel to South Dakota to deliver a speech and watch fireworks at Mt. Rushmore. And in a novel twist, there will be a ball drop in New York City’s Times Square at midnight to usher in the July Fourth holiday with much the same revelry that is typically reserved for New Year’s Eve.

The activity culminates in the main event Saturday, when fireworks will erupt in communities across the U.S., along with backyard cookouts and block parties. Trump will deliver another speech at the National Mall in Washington before what is being billed as a historically massive fireworks show.

But for all the celebrations, there are also serious safety considerations as potentially record heat grips much of the Midwest and East Coast. Officials have warned those celebrating the holiday to stay hydrated and take air-conditioned breaks as needed.

The heat has already affected some of the programming surrounding the holiday. In Washington, organizers of the Capitol Fourth concert banned the public from attending a Thursday rehearsal because of the heat.

The concert Friday, a staple of Washington’s Independence Day traditions, is on, but the gates will open to the public later than usual, at 7 p.m. EDT, an hour before the show. Organizers of celebrations in Washington on Saturday said they were adding water stations along with cooling resources and medical support.

From Boston to Norristown, Penn., and Gettysburg National Military Park, plans were shifting to accommodate the soaring temperatures. Amtrak canceled some trains in the Northeast due to excessive heat that could affect the tracks.

The holiday is unfolding at a unique time in the U.S. The anniversary has served as an opportunity for the country to reflect on its history while also reminding it of the political polarization of the moment.

Even the celebrations themselves have not quite escaped the divide.

Freedom 250, an organization aligned with the White House, has come to rival America250, a bipartisan group founded by Congress a decade ago. Freedom 250 has organized much of the activity in Washington, including the Great American State Fair, which has gained attention for the relatively small crowds it has attracted. America250 is behind the ball drops unfolding in many cities, including New York, and will host a concert in Los Angeles on Saturday.

About 4 in 10 U.S. adults feel “proud” about the country’s 250th anniversary, according to an April survey from the Associated Press-NORC Center for Public Affairs Research. Roughly 3 in 10 said “excited” describes their emotions.

Sloan writes for the Associated Press. Associated Press writers John Hanna in Topeka, Kan., Michael Casey in Cambridge, Mass., and Calvin Woodward in Washington contributed to this report.

Nope, it’s not AI. It’s just a really big flag with bright lights, draped on Hoover Dam for the next several weeks.

As a display to mark the 250th anniversary of U.S. independence, the states of Nevada and Arizona and the federal Bureau of Reclamation teamed up to hang and illuminate an enormous American flag on the dam on Memorial Day.

The display, scheduled to be in place through July 4, is visible to anyone crossing between Arizona and Nevada on U.S. Route 93, which goes across the top of the dam. The flag is 150 feet tall and 300 feet long, spread on the south-facing side of the dam and lit by 550 LED lights (powered by dam-generated electricity).

A wider view of the illuminated U.S. flag at Hoover Dam.

(Michael Bittle)

It’s a spectacle that comes at a challenging moment for Hoover Dam, as experts warn that Lake Mead’s dwindling water levels could threaten the dam’s ability to generate hydropower. “Slap a flag on it, that’ll fix it,” suggested one of several Reddit commenters who were moved to snarkiness by the flag image.

The dam, a frequent day-trip destination from Las Vegas, stands 35 miles east of the Las Vegas Strip, about 295 miles northeast of Los Angeles. The site features a visitor center and overlook, and guided and self-guided tours.

Installation of the display involved dozens of riggers and two cranes. The flag, which is roughly the dimensions of a football field, has been previously used for celebrations at Indianapolis Colts and Las Vegas Raiders football games.

Within two days after it was hung, gusts of wind up to 50 mph prompted organizers to lower the flag last Wednesday as the National Weather Service declared a wind advisory for the area. Organizers raised the flag again late Friday.

Strong winds are not uncommon in the area. Organizers said weather “may periodically require the flag to be temporarily lowered.” Updates on the flag’s status can be found on the Hoover Dam Facebook page.

The Las Vegas Convention and Visitors Authority paid for the display. A spokeswoman said the cost, including flag, production, installation costs and six weeks of lighting, will be between $750,000 and $1 million.

The dam, a five-year construction job that was completed in 1936 during the depths of the Great Depression, is often hailed as one of the nation’s most impressive works of infrastructure. Though this is not the first time a flag has been draped on it, organizers have called the display “the most ambitious long-duration installation ever attempted at Hoover Dam.”