Tropical Storm Erin formed in the Atlantic Monday morning, Aug. 11. Erin could become a hurricane by Aug. 13. Because the flooding has been a growing concern, city officials have installed emergency flood barriers along several miles of riverbanks. Flash flooding has emerged around the St. Louis region after heavy rain Tuesday afternoon.

The air feels tropical in North Carolina, but tropical activity is ramping up in the Atlantic Ocean were Erin may become a hurricane. Erin may also could impact the Leeward Islands and Puerto Rico depending on how far north the storm tracks.