Massive storm threat builds for America's Heartland

Massive storm threat builds for America's Heartland

A potentially potent storm system could spawn EF-2 tornados, large hail and flooding on Wednesday. FOX Weather Meteorologist Bob Van Dillen explains the severe weather threat kicks off Tuesday and peaks Wednesday for places in Tennessee, Arkansas, Indiana, Missouri and Kentucky. NOAA's Storm Prediction Center upgraded the severe thunderstorm threat for this area to a level 4 out of 5.