Here's why pummeling tornadoes are coming for the Southern Plains

It's an ominous Monday in the southern Great Plains. Entire school districts are closed as storm scientists expect "high risk" weather and severe thunderstroms, with conditions ripe for powerful tornadoes throughout much of the Texas Panhandle and Oklahoma. A confluence of robust elements have combined forces to produce an exceptionally dangerous day."It's an environment that we don't see very often," said Bill Bunting, operations chief for the National Oceanic and Atmospheric Administratio