Norah plus the new Tornado Threat tonight. The Cbs Evening News starts now. Tonight, tens of millions of americans are in the path of dangerous storms from texas to vermont. Good evening, im norah odonnell, and thank you for being with us. Its a fourth straight day of Severe Weather bringing destructive wind, flooding, and tornadoes. Several twisters touched down last night in the hawkeye state, including one with winds up to 165 Miles Per Hour. And the scope of the devastation is heartbreaking. This is what the small town of greenfield, iowa, looks like from above tonight. Home after home brought to the ground. Search and rescue operations are underway right now with the governor revealing its unknown exactly how many people are dead or missing. Cbss Roxana Saberi is in greenfield tonight, talking to families who lost everything. Reporter the tornado that ripped through greenfield, iowa, left a trail of destruction several miles long. This is a Search And Rescue mission, and it will c