Two massive wildfires burning in Arizona and Utah are doing more than scorching the landscape. They’re generating towering “fire clouds” that make firefighting nearly impossible. These towering ...

The Dragon Bravo Fire exploded in size to 105,415 acres along the Grand Canyon’s North Rim on Thursday as heat and strong ...

The wildfire—one the few to burn more than 100,000 acres this summer—is burning on the more remote North Rim 11 miles away.

Without more details about the early response to the Dragon Bravo Fire, the same mistakes could be repeated, and not just at the Grand Canyon.

The Thomas fire created a huge pyrocumulus cloud in December 2017. The Mountain View fire that largely destroyed the small town of Walker, Calif., this week gave rise to a similar phenomenon.

Pyrocumulus clouds can also increase wildfire spotting, which is when a fire produces sparks or embers that are carried by the wind and start new blazes beyond the zone of the main one.