The fire has burned for a month on the North Rim of the Grand Canyon, destroyed historic buildings and called for thousands of fire personnel.

Pyrocumulus clouds, otherwise known as flammagenitus or “fire clouds,” develop due to “convection initiated by heat from forest fires, wildfires or volcanic eruption activity,” according to the World Meteorological Organization.

It’s been one month since the Dragon Bravo Fire broke out on the North Rim of Grand Canyon National Park. The blaze has burned more than 123,000 acres and is 13% contained as of this morning.