(CNN)Two people died Wednesday after severe weather caused a landslide in western North Carolina.
5 people have died this week since Alberto made landfall
Heavy rains pummeled the western part of the state on Tuesday and Wednesday, causing mudslides and forcing evacuations and road closures.
Another person is missing in north-central Virginia.
Initially, two people were missing, according to authorities in Albemarle County. Floodwater swept away their Toyota Prius around 9:30 p.m. Wednesday, when Ivy Creek topped its bank, creating a flash flood that swept away the Prius and another car.
Witnesses watched as two occupants managed to exit their vehicle before being swept away, according to Dan Eggleston, the county's fire rescue chief. The vehicle was located, Eggleston said in a news conference.
Authorities recovered one of the bodies on Thursday afternoon, according to Albemarle County Police, marking the fifth death due to weather. The other person is still missing.
The occupant of the second car escaped and was rescued, Eggleston added.
"Ivy Creek's normally a very docile creek, but with 8 to 10 inches of rain ... it turned into a swollen, raging river," he said, "and it just tossed and turned both of those vehicles."
County authorities carried out at least 10 water rescues overnight, Eggleston said.
Two people were found dead in the rubble of a home in Boone, North Carolina, according to the Boone Fire Department. A landslide caused a gas explosion that leveled the house, said Shane Robbins, the Boone Police Department spokesman.
The deaths are the legacy of a storm named Alberto, which made landfall earlier this week as a subtropical storm and has since drenched the states in its path. On Monday, two journalists from South Carolina-based CNN affiliate WYFF were killed in Polk County, North Carolina. A tree fell on their SUV as they covered the hazardous weather, the station said.
While the storm had weakened by Thursday, it was still dumping rain across large swathes of the country, according to CNN meteorologists.
More than 9 million people were under flash flood watches Thursday morning, including Baltimore and Washington. Ellicott City, Maryland, which was devastated by flooding earlier this week, is also under a watch.
The weather conditions prompted North Carolina Gov. Roy Cooper to declare a state of emergency Wednesday for the western part of the state.
"This storm isn't yet over. I'm urging people to keep a close eye on forecasts and flood watches, and asking drivers to use caution, especially when traveling in our western counties," Cooper said in a statement Wednesday.
The emergency declaration will help the state coordinate its response and "prepare for any additional impacts," the statement said.
In 24 hours, 4 to 7 inches of rain slammed parts of a region that had been hit by frequent rain for a couple of weeks. And in the next couple of days, there will be a threat of flash flooding as storms persist, the governor's office said.
The North Carolina Department of Transportation has been assessing damage and removing debris caused by mudslides, washouts and flooding on interstates, highways and local roads.
Several towns in western North Carolina reported high water levels, power outages, downed trees and blocked roads.
The city of Asheville reported road and park closings and school delays Wednesday. It is managing water releases from the North Fork Reservoir Dam.
Alberto made landfall Monday as a subtropical storm in the Florida Panhandle and weakened to a subtropical depression later that day. But it brought heavy rainfall, drenching parts of northern Georgia, the western Carolinas and Tennessee on Tuesday, increasing the threat of flash flooding in those areas, the National Weather Service said.
After moving into the Tennessee Valley, the system is forecast to head into the Ohio Valley and Great Lakes region Thursday, according to the National Hurricane Center.
Florida, Mississippi and Alabama -- the three states bearing the brunt of the storm -- declared emergencies ahead of Alberto.
Hurricane season is set to begin officially Friday.