Hurricane Harvey explodes into a violent Category 4 storm, the first to strike the U.S. mainland since Hurricane Katrina. When two strong weather fronts block Harvey, it stalls over Houston and unleashes billions of tons of rain. The flooding is catastrophic, leaving thousands in danger, including Iashia, a Katrina survivor.

In one day in December 2023, three supercells, nature's most violent storms, travel through Tennessee, triggering a rare winter tornado outbreak. Local news meteorologist Danielle and storm chaser Caleb broadcast warnings of potential disaster as the supercells unleash deadly twisters striking Clarksville and the surrounding areas of Nashville.

Wildfires are part of life in Australia, but in the summer of 2019 the country is drier and hotter than ever. In what becomes known as the Black Summer, 24 million hectares burn. Firefighters David and Matt take on a new species of fire, 19-year-old India battles to save her home, and the Royal Australian Navy carry out an unprecedented evacuation.