By Hanna Park and Matt Rehbein, CNN (CNN) — A violent, tornado-spawning storm system tore across the central US, leaving at least 21 people dead in Missouri and southeastern Kentucky as it cut a path of destruction across several states. The 14 deaths in Kentucky come on the heels of fatalities reported hours earlier on Friday in the St. Louis area, which saw widespread destruction. Seven people were reported dead in Missouri. In all, large torn…