A wildfire that has closed the North Rim of Grand Canyon National Park raged out of control over the weekend and is now the largest currently burning in the country. The Dragon Bravo fire has burned more than 133,000 acres and was only 13 percent contained as of Wednesday morning, according to a federal interagency website that tracks wildfires.

The Dragon Bravo Fire became a “megafire” this week, doubling in size in just a few days as heat and strong winds drove the growth.

A wildfire burning near the Grand Canyon has grown into what experts call a 'megafire,' and it has even developed its own weather.