The flooding could be life-threatening, officials said.
Power lines and trees are down on at least 10 other roads.
Five people died as a result of the storm in North Carolina on Friday.
12:09 p.m.: Moore County schools will remain closed Monday due to power outages and heavy rain in the area.
More than 150 roads were closed in Wilmington on Saturday.
Yes, ContinueNo 10:40 a.m.: Flash flood warnings that were in effect for many central North Carolina counties, including Wake, have been extended until 5 p.m.
About 6,100 people in the county remain without power.
6:07 a.m.: State officials said 782,909 people remain without power.
5:04 a.m.: Officials said 780,390 are without power across the state.
4:37 a.m.: A tornado warning is in effect for Lenoir County until 5 a.m. 4:33 a.m.: WRAL meteorologist Elizabeth Gardner said that even though the center of Tropical Storm Florence is in South Carolina, North Carolina will continue to get the brunt of rain from the system, especially in the southern counties.