Warnings of tropical storms were issued in parts of South Carolina and North Carolina on Saturday. Heavy rainfall and flash flooding are expected to occur over the July Fourth weekend.

The National Hurricane Center announced that Tropical Storm Colin formed close to the South Carolina coast, 50 miles southwest from Myrtle Beach.

At 5 a.m. ET Saturday, Colin was located just over South Carolina’s inland coast and experienced maximum sustained winds of around 40 m.p.h, according to the advisory.

It said that the storm was likely to move northeastwards along the coasts the Carolinas. It said that heavy rainfall up to 4 inches was possible, which could lead to flash flooding in some areas.

According to forecasters, the storm conditions will hit South Carolina Saturday morning. They will also impact North Carolina Sunday morning. Then they will dissipate over the western Atlantic Monday.

From South Santee River (S.C.) to Duck, N.C., a tropical storm warning was in place

The threat of flooding was posed by heavy rains as the storm developed hours after Tropical Storm Bonnie struck Nicaragua.

According to the National Hurricane Center, Bonnie was spotted late Friday along the Carribean coast of Central America about 75 miles south from Bluefields.

Forecasters warned of flooding with heavy rains, up to 8 inches in some places and more in others.