Hurricane Helene was upgraded from a tropical storm Wednesday morning and will reach full intensity before making landfall in Florida on Thursday, according to the National Weather Service. Here’s what to know.

A hurricane warning is in effect for Florida’s Big Bend through southwestern Georgia and Tallahassee, with storm surge warnings reaching from Indian Pass, Florida, southward to Flamingo, including Tampa and Charlotte Harbor. Tropical storm warnings extend to Atlanta and Charleston, South Carolina. Evacuations began Tuesday in Florida’s coastal areas, but mandatory evacuations are in place in Franklin, Wakulla, and Taylor counties.