How the weather goes from tornadoes to snow

Snow
Snow coats birch trees outside the Arrowhead Library System Headquarters in Mountain Iron, Minn. on Monday, April 16, 2012.
Photo courtesy Brian Minor

On Sunday, warm, moist air helped create a series of tornadoes in central Minnesota. On Monday, much of the state is getting snow. Tony Zaleski of the Twin Cities office of the National Weather Service talks to Cathy Wurzer about why this dramatic shift is happening.