CNN Erin Burnett OutFront October 4, 2013 23:35:00
What do you know about these in. >> they were big. they may have been to a mile wide at a time and they're still up and down in the sky, out of the sky tonight. this is just the beginning. we think of fever weather season as spring. that's when the warm air pushes away the cold air. there are the storms, sioux city, iowa, just to the north of sloan, iowa. if you see a hook or a c almost, we call that a hook echo. that's where the tornado is. one right there. that just went north of sloan. one there that went near jefferson and sioux city, iowa and more toward southwest that will develop tonigh...