Flash flood emergencies are ongoing in multiple states.
Helene made landfall in Florida's Big Bend region Thursday night as a massive Category 4 hurricane -- the strongest hurricane to make landfall in the Big Bend on record.
Helene has since weakened to a tropical storm and is now pushing through Georgia and the Carolinas, bringing catastrophic rainfall and life-threatening flash flooding as the storm moves toward Tennessee.
Over 900 flights have been canceled nationwide on Friday.
The airports facing the most cancellations are Charlotte Douglas International Airport in North Carolina, Hartsfield-Jackson Atlanta International Airport and Tampa International Airport in Florida.
The Tampa airport, which was closed all day Thursday, has since reopened.
In Valdosta, Georgia, search and rescue teams are trying to reach people trapped inside heavily damaged buildings, Georgia Gov. Brian Kemp said.
"We are asking for patience as we prioritize critical medical emergencies and essential services,” he said.
Helene hit especially hard between Valdosta and Augusta.
Atlanta is facing major flooding.
More than 4 million customers lost power across the South Friday in the wake of Hurricane Helene.
Over 1 million customers are without power in Georgia and 900,000 are without power in Florida.
More than 50 health care facilities are operating on generator power across Florida, officials said.
Another 1.2 million are without power in South Carolina and 700,000 are without power in North Carolina.
At least 26 people have died from Hurricane Helene.
In Georgia, 11 people were killed, including a first responder who was trying to save others, Georgia Gov. Brian Kemp said.
In McDuffie County, just west of Augusta, a mother and her twin infants were among the victims, officials said.
In Wheeler County, southeast of Macon, a man and a woman were killed after their mobile home overturned, local officials said.
In Florida, seven people have died.
One person died in Dixie County in the Big Bend region when a tree fell on a home, Gov. Ron DeSantis said, and a second person was killed on Interstate 4 near Tampa when a sign fell on a car.
Five others died in Pinellas County, according to the sheriff.
In Charlotte, North Carolina, one person was killed when a tree fell on a house, according to the Mecklenburg EMS Agency, and another person died in a traffic accident in Catawba County, officials said.
Six people have died in South Carolina: two in Anderson County and four in Aiken County, officials said.
