Tropical Storm Arthur formed on Wednesday along the U.S. Gulf Coast, becoming the first named Atlantic storm of the 2026 season after a disorganised cluster of storms that had been drenching the region for days finally consolidated. The National Hurricane Center warned that the storm's primary danger is a prolonged, multi-day rainfall event capable of life-threatening flash flooding across a broad arc from Texas to the Florida Panhandle, with isolated rainfall totals potentially reaching 20 inches (50 centimetres). At least two deaths have already been linked to the associated flooding, and nearly 40 million people across the region remain under flash flood alerts.