Tonight on PBS Newsweekend, as the country navigates the extreme heat, many incarcerated

Americans are suffering through the scorching temperatures with little or no air conditioning.

Anyone outside of prison can go outside and catch a breeze.

They have more access to water.

They're not literally living day-to-day, hour-by-hour in these cells of building made out of stone

concrete that are really heating up like ovens.

Then why millions of Americans are living in areas without easy access to an ambulance?

And we get a bird's-eye view of falconry, the ancient sport of hunting game with birds

of prey.

Good evening, I'm John Yang.

Across the south and west, new all-time heat records could be set, as forecasters say

the week's long heat wave is entering its most intense phase.

The forecast high in Las Vegas was 117 degrees, that's the hottest temperature ever recorded

there.

Nearly a third of all Americans are under heat advisories, watches and warnings.

For some areas, the heat wave has been unrelenting.

Phoenix, Arizona, has seen 16 straight days with highs over 110 and is on track to beat

the record of 18 days.

El Paso, Texas has had highs above 100 for a month.

There's also a record setting heat in the waters off Florida reaching the mid-90s.

Not only does it make it harder for people to cool off, scientists warn of coral bleaching,

fish kills and algae blooms, and the warm waters could fuel tropical storms come hurricane

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