Here's how Hurricane Helene turned into a major storm

Governors across the southeastern United States have declared statewide states of emergency as Hurricane Helene continues its ascent. After forming in the northwestern Caribbean Sea Tuesday, Helene escalated from a tropical storm, then to a cyclone, and finally to a Category 4 hurricane by the time it made landfall late Thursday night. We talk to hurricane climatologist Jill Trepanier about how a storm tropical storm system rapidly intensifies into a major hurricane, the impact of a changing climate on future storms — and why the devastation doesn't stop at the shore.

*Follow local updates on Hurricane Helene.*

Want to know more about the scientific underpinning of serious weather events? Email us at shortwave@npr.org — we might cover it on a future episode!