An intense line of storms formed in central Oklahoma on the evening of Wednesday, April 19, prompting tornado warnings in the area.This footage, filmed by Twitter user @TheOKTransKC, shows dark storm clouds rolling in the distance, as small hail stones pelt the area of Moore in Oklahoma.The National Weather Service issued a tornado watch for the area on April 19 until 11 pm. A severe thunderstorm warning was also in place until 7.45 pm. Credit: @TheOKTransKC via Storyful