How Hurricane Helene became a monster storm

This aerial picture taken on September 27th, 2024, shows a flooded street after Hurricane Helene made landfall in Steinhatchee, Florida. | Photo by Ricardo Arduengo / AFP via Getty Images

The Southeastern United States is reeling from Hurricane Helene, a monstrous storm that made landfall in Florida on Thursday before cutting a terrifying path all the way up to Tennessee. How did it get this bad?

The storm has killed more than 100 people, and hundreds more are still missing. Power is out for millions of people.