To my great shame I used to read Vox for a while in the 2010s. Looking back most of their content was dogshit.

But they had one article talking about the potential fallout of a significant heat wave hitting Phoenix. Their climate is already extreme, and apparently there's a decent chance sometime in the near future they could get hit with a month or so of abnormally elevated temperatures.

Basically it would wreak havoc on their infrastructure. The electrical grid would be fucked. Without AC people would start dying of heat stroke. A mass evacuation would cripple the roads throughout the city and people would cook to death on the highway.

I'm embellishing a bit, but it would be hellish.