How urban heat islands make the impacts of excessive heat worse?

Urban heat islands make hot days feel even hotter, just like how your bedroom feels stuffier on a summer day if you leave all the lights on.

Cities are like big blankets that trap heat. In the daytime, the sun shines on buildings and roads made of concrete and asphalt, these materials get really hot and stay hot long after the sun goes down. It’s like wearing a heavy jacket when it's already warm outside.

In the countryside, there are lots of trees and grass that help cool things down. But in cities, there are fewer trees and more rooftops and streets. These hard surfaces absorb heat instead of letting it go away, kind of like how a black shirt gets hotter in the sun than a white one.

Also, cities have less wind to carry the heat away. Think about when you're outside on a hot day, if the air is still, it feels even hotter. That’s what happens in urban heat islands, the heat stays around longer and makes people feel more uncomfortable, especially during heatwaves.

So next time it's really hot, imagine your city as a giant, warm blanket that just won’t let go of the heat! Urban heat islands make hot days feel even hotter, just like how your bedroom feels stuffier on a summer day if you leave all the lights on.

Cities are like big blankets that trap heat. In the daytime, the sun shines on buildings and roads made of concrete and asphalt, these materials get really hot and stay hot long after the sun goes down. It’s like wearing a heavy jacket when it's already warm outside.