Detailed text transcripts for TV channel - MSNBC - 20150522:02:41:00
If if that rear flank down draft isn't super cold it can allow a tornado form especially when you have on the eastern side of that that warm moist air. you see the rotation going on and viola, we've got otherwise a tornado. preceding a tornado, there's another feature we have to talk about. you saw it on the video that we just showed. it's a wall cloud. it's the base of the thunderstorm beginning to lower, tremendous violent motion. sometimes they whole wall clouds are rotating. sometimes you see the air coming up into the wall cloud. but when the wall cloud starts to produce a funnel and whet...