Cooper said he will be traveling to western North Carolina on Thursday to visit counties affected by the storms.
". this storm isn't yet over".
The State of Emergency will help the state coordinate storm response and prepare for any additional impacts.
Half an inch to an inch of rain is anticipated by late tonight. And in the next couple of days, there will be a threat of flash flooding as storms persist, the governor's office said.
Areas downstream of Lake Tahoma Dam, including residences and businesses along USA 70 from Lake Tahoma Road to US 221 Business near Garden Creek, were evacuated Wednesday morning.
Forecasters say heavy rain will continue in northwestern SC where there has been rain for two weeks. Officials were continuing to inspect the dam through the daylight hours.
At its height, Alberto, the first storm of the 2018 Atlantic hurricane season, blasted sustained winds of 65 miles per hour (105 kph) with gusts that packed full hurricane punches of 75 miles per hour (121 kph), said meteorologist David Roth of the National Weather Service.
Wednesday morning, an engineer deemed the dam safe and all evacuations were lifted.
"The emergency at Lake Tahoma has been canceled". "To save your life, please heed all county evacuation notices and take action to leave the vicinity immediately!"
McDowell County Emergency Management says an engineer at the dam recommended a "Level 1 Emergency" and called it an "extremely risky situation". We need the public to be a partner with us and do not go around barriers. "An incredibly moist pattern remains in place over the eastern USA, mostly responsible to the presence of Alberto and its tropical moisture feed", the National Weather Service said. An interstate highway was closed for a time Tuesday and schools will not open Wednesday.
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McDowell County Emergency Management Deputy Director Adrienne Jones told The Associated Press that five minor injuries have been reported during water rescues since Alberto made landfall.
"This is an extremely unsafe situation", the warning said. "What we are hearing is 1 to 3 inches across the county this afternoon and this evening, possibly more than 5 inches in heavy rain", said Yaussy.
They said the Hickory Nut Falls Campground and the Rivercreek Campground have been evacuated. These include Burnettes Landing, Lake James Landing (Paddy's Creek), State Park, and Mystic Landing.
WSOC reported there were "several" landslides in McDowell County and that four swift water rescues were carried out overnight.
Separately, the NWS forecasts that the Catawba River, which runs west of Charlotte, will crest at 18 feet above flood stage by 7 a.m. Wednesday.
Elsewhere in the Southeast, the storms triggered more flooding and mudslides. Most outages were in Henderson, McDowell Cleveland, Buncombe, Swain and Transylvania counties. He also stood and watched the flood waters Wednesday morning.
Western portions of the Carolinas have seen more than 20 inches in the past two weeks, the National Weather Service said.
Earlier this week, two television station employees of WYFF in Greenville, S.C., were killed when a tree fell on their vehicle as they covered Alberto in Polk County, N.C.
Beachgoers walk on Okaloosa Island in Fort Walton Beach, Fla., Monday, May 28, 2018, as Subtropical Storm Alberto approaches the Gulf Coast.