The prolonged heavy rainfall is expected to cause dangerous and life-threatening flash flooding, particularly in low-lying and poorly drained areas. Swells generated by Arthur are creating hazardous surf and rip-current conditions along the Gulf Coast. Tornadoes remain a threat in some areas, compounding the risks. Emergency measures, including sandbag distribution and drainage clearing, are underway in affected communities. The storm has already caused fatalities, including the drowning of a teenager in Texas.