Florida residents prepared for a heavy blow from Hurricane Helene as the Category 4 storm churned northward Thursday, prompting warnings of pounding rain and a storm surge that could create “unsurvivable conditions” in some areas.

Hurricane Helene made landfall in Florida’s Big Bend as a Category 4 storm late Thursday, knocking out power in over a million homes and businesses and causing at least one death in the state as the National Hurricane Center warned of life threatening winds and catastrophic storm surges.