May 31, 2012 3:32 pm Archive: Back of the Yards Fire Kills 6 From the archives: NBC Chicago reports on the March 1984 fire that killed Elva Lupercio and her five children. Local 1:53 What is a geomagnetic storm and how does it cause the Northern Lights? Here's what to know 2:13 Chicago Forecast: Great Mother's Day weekend weather 2:11 Father shot and killed on the way to work during Dunning attempted robbery 1:53 Solar storm produces breathtaking Northern Lights display 3:06 NBC 5 Nightly Update: Friday, May 10