Fire crews in North Carolina are battling multiple wildfires across four national forests, with the largest burning in Uwharrie National Forest, about 50 miles (80km) east of Charlotte.

The US Forest Service said the 400-acre (162-hectare) fire, reached about one-third containment by Sunday afternoon.

Meanwhile, in Polk County, the small town of Tryon remains under evacuation orders as a separate wildfire continues to spread.

The blaze, which has scorched 500 acres (202 hectares) with zero containment, prompted officials to urge some residents to leave on Saturday.

One of two Carolina Forest area wildfires that burned roughly 2,000 acres over the weekend has been fully contained.

According to the South Carolina Forest Commission, the Blackthorn Drive Fire, the smaller of the two. is 100 per cent contained.

Crews battled wildfires in North and South Carolina on Sunday amid dry conditions and gusty winds and evacuations were ordered in some areas.

The National Weather Service warned of increased fire danger in the region due to a combination of critically dry fuels and very low relative humidity.

In South Carolina, Gov. Henry McMaster declared a state of emergency on Sunday to support the wildfire response effort, and a statewide burning ban remained in effect.

Horry County Schools will run on a regular schedule on Monday based on re-entry protocols into several Carolina Forest neighborhoods, district officials have said.

“We recognize that many students, their families and staff may still be affected by the wildfires. We are committed to being flexible and working with each individual on a case-by-case basis tomorrow,” spokeswoman Lisa Bourcier said in a statement.

“If you or your family are experiencing challenges due to the fires, we encourage you to reach out to your school to discuss your specific circumstances and needs.”

Evacuated residents in the Carolina Forest area of Myrtle Beach were allowed to return home on Sunday afternoon, though were warned to be vigilant.

As of 4:25 p.m., residents of all neighborhoods were given the go ahead to go home.

Representative of South Carolina District 56 Tim McGinnis said no one was injured or killed and no structures have been lost.

A burn ban was issued in Horry County after several fires on Thursday.

At its largest the California Forest wildfire grew to more than 1,600 acres, the South Carolina Forestry Commission reported on its official tracking site. As of 5.30 p.m. it was 30 percent contained.

Throughout much of Sunday officials estimated that the size of the blaze was 1,200 acres.

The National Weather Service warned of increased fire danger in the region due to a combination of critically dry fuels and very low relative humidity.