drivers racing for shelter under gas station canopies, as hail battered the dallas area. >> you could hear it coming from the distance, just like a stampede. >> reporter: some stones the size of baseballs. in little elm, more than 70% of the school buses are out of commission. it's all part of a multi-day storm outbreak that brought more than 200 reports of severe weather. >> here's a frame from a mobile home that was blown off. >> reporter: an ef-2 tornado in arkansas. and straight-line winds up to 100 miles per hour, destroying this louisiana church. and we have got ominous clouds behind us here. the rain starting to come down again. we've seen thunder and lightning. here in louisville, we're under a severe weather watch all night long. we could see wind gusts of up to 70 miles an hour, large hail and possibly tornadoes. david? >> all right, under a watch there in louisville. adrienne, thank you. let's get right to chief meteorologist ginger zee, who is tracking this right into the night. >> reporter: and that severe thunderstorm watch that adrienne is in goes all the way south into parts of alabama.