Two heat waves last year killed at least 14 people in the Bay Area, and the past five summers have been the hottest on record in California. It’s a warming world, and heat can pose a serious threat, even in the normally temperate Bay Area. For the past five months, reporter Molly Peterson has been investigating the health risks of heat, and in this story, she looks at its deadly consequences.

Read also: “Extreme Heat Killed 14 People in the Bay Area Last Year. 11 Takeaways From Our Investigation”