prudential bring your challenges why is philips sonicare the most loved electric toothbrush brand by americans and their dentists? because it leaves your mouth with a level of clean like you've never felt before. get healthier gums in 2 weeks. innovation and you. philips sonicare welcome back to "the lead." i'm jake tapper. in our national lead you're looking at live footage right now from clarksdale, mississippi. rare tornado danger in december. it threatens 45 million people just two days before christmas. you're looking at live pictures as i said coming from clarksdale, mississippi. and you can see a large funnel cloud building there. severe winter storms expected to strike many southern states. thunderstorms have already caused wind damage in parts of arkansas, missouri and illinois. let's bring in cnn meteorologist jennifer gray. she's been keeping a close eye on these potential tornadoes. jennifer, how powerful is this