Oklahoma's 3rd megafire in 3 years torches 242K acres

Wildfires have been raging across parts of Oklahoma over the past week, scorching nearly 250,000 acres. One fire is being categorized as a megafire -- the third megafire to hit Oklahoma in three years. Bob Henson, a meteorologist and writer at Weather Underground, joins CBSN to discuss why Oklahoma is seeing such massive fires.