At least 15 tornadoes touched down across Mississippi and Louisiana Tuesday night in what can be considered a tornado outbreak, as severe weather impacts the Gulf Coast and the Tennessee River Valley.Tornadoes have been reported near Bakers and Steens, Mississippi, and over Vernon, Mississippi, producing quarter sized to ping pong-sized hail.The tornadoes are expected to hit into Tuesday night, although the peak of the tornadic activity has likely happened.Impacts could also reach New Orleans, Mobile and Birmingham, Alabama; Nashville, Tennessee, and eastern Kentucky.ABC News' Melissa Griffin contributed to this report."