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.

Tropical Storm Erin formed Monday in the eastern tropical Atlantic Ocean and could become the first hurricane of the 2025 Atlantic season later this week, forecasters say. In the Pacific Ocean, Hurricane Henriette strengthened well away from Hawaii.

Tropical Storm Henriette was strengthening in the central Pacific Ocean far northeast of Hawaii and could become a hurricane but posed no threat to land, the