Helene unleashed devastation across the Southeast.
More than 230 people have been killed from Hurricane Helene, which unleashed devastation across Florida, Georgia, South Carolina, North Carolina, Virginia and Tennessee.
Helene, which made landfall in Florida's Big Bend region as a massive Category 4 hurricane, has become the deadliest mainland hurricane since Katrina in 2005.
Hurricane Helene is forecast to bring six to 12 inches of rain, with isolated totals around 18 inches, to the Southeast.
The intense rainfall could cause "catastrophic and potentially life-threatening" flooding, the National Hurricane Center warned.
Helene is a large storm, so it could bring life-threatening storm surge for the entire west coast of the Florida Peninsula.
Storm surge could reach 15 to 20 feet in the Florida Panhandle. The Tampa area could get 4 to 8 feet of storm surge.
Click here to read how storm surge works and why it's so dangerous.
Helene has strengthened to a Category 2 hurricane with winds of 100 mph.
The storm will continue to strengthen throughout the day and is forecast to be a major hurricane by the time it makes landfall Thursday night.
Hurricane Helene's landfall may see "damaging winds" penetrate as far inland as major metro areas like Atlanta, Georgia, the National Hurricane Center warned.
The storm is "strengthening and expected to bring catastrophic winds and storm surge to the northeastern Gulf Coast," the NHC said in its latest update.
A hurricane warning is currently in place for parts of Florida and Georgia. This includes Tallahassee and Apalachicola, Florida, and Valdosta, Columbus and Macon, Georgia.
A tropical storm warning is in place for cities including Miami, Orlando, Jacksonville and Atlanta. Dothan, Alabama, Charleston, South Carolina, and Asheville, North Carolina are also under tropical storm warnings.
The hurricane is expected to gather speed to Category 3 status -- with winds of 111 mph and above -- by the time it makes landfall on the Florida coast on Thursday night.
Helene's damaging winds could reach Atlanta and other cities by Friday morning, subsequently passing into the Appalachians and Ohio Valley by Friday afternoon.
-ABC News' Max Golembo
