Tropical Storm Chantal was downgraded to a depression on Sunday after making landfall in South Carolina.

The system made landfall near Litchfield Beach at about 4 a.m. ET on Sunday, the National Hurricane Center in Miami said. Tropical storm warnings were canceled for portions of the two Carolinas, but heavy rain was forecast for the region through Monday.

A total of 2 to 4 inches and local amounts up to 6 inches of rain were expected to fall, raising concerns of possible flash flooding as the system makes its way into central and eastern North Carolina on Monday.

The system is expected to turn to the northeast late Sunday as it weakens further.

South Carolina's Emergency Management division had warned residents earlier of the possibility of isolated tornadoes along the coast and of minor coastal flooding.

It also warned drivers not to venture on water-covered roads or around road closure signs where flooding occurred.

The Atlantic hurricane season is from June 1 until Nov. 30, with peak activity typically occurring between mid-August and mid-October. 

NOAA officials predicted a 60% chance of an "above-normal" Atlantic hurricane season, with between 13 to 19 named storms. Six to 10 of those are expected to strengthen into hurricanes, and three to five could become major hurricanes, forecasters said.