The primary concern is widespread heavy rainfall leading to flash, urban, and river flooding across the Texas Gulf Coast and Lower Mississippi River Valley. The National Weather Service has issued a moderate risk of excessive rainfall for these areas through early Friday. Coastal regions may also experience storm surge of up to 4 feet, life-threatening rip currents, and gusty winds. Tornadoes are possible through the evening of June 16, particularly along the upper Texas coast and into southern Louisiana, Mississippi, Alabama, and the Florida Panhandle. Motorists are advised to avoid flooded roads, as flash floods are a leading cause of weather-related fatalities.