trailer in half. the driver escaped with his life. it was not the only tornado on the ground. at least four people killed west of oklahoma city in canadian county. at one point the national weather service had to evacuate its norman oklahoma storm prediction center. take a look. >> wow. woe got lightning really close. where is it? yeah. >> okay, we got another tornado on the ground. we're going to have to get out of here, guys. we can't stay around here. >> multiple vortex tornado on the ground. where's the location towards the south? >> don't worry about it. >> we're good, we're good. >> we'll be all right. >> here's a remarkable view from reporter david payne.