Why is extreme heat considered the deadliest weather hazard?

Extreme heat is like when your body can’t cool down no matter how hard it tries, and that can make you very sick or even hurt you.

Your body works like a fridge. When it's hot outside, your body tries to stay cool by sweating. But if the air is super hot, the sweat doesn't evaporate fast enough, it just sits on your skin like water on a hot sidewalk. That makes your body feel hotter and hotter inside, like when you're wearing a thick coat in summer.

Your heart has to work harder. Imagine running up a hill every minute for hours straight, that’s what your heart does during extreme heat. It pumps more blood to help cool you down, but if it gets too tired, it can't keep going, and you might feel dizzy or even pass out.

Extreme heat is like the sun being extra loud and strong. You know how sometimes the sun feels so hot it burns your nose? That’s what extreme heat does, it can burn your skin and make it hard for your body to do its job properly. And if it keeps happening day after day, it might even be too much for your body to handle.