Two wildfires burning in the western United States — including one that has become a “megafire” on the North Rim of the Grand Canyon — are so hot that they’re spurring the formation of “fire clouds” that can create their own erratic weather systems.

In Arizona, the wind-whipped Dragon Bravo Fire that destroyed the Grand Canyon Lodge is 9% contained and has charred more than 164 square miles to become the largest fire now burning in the continental U.S. and one of the top 10 largest in recorded Arizona history. Getting around it would be roughly like driving from New York City to Washington, D.C.

Another large fire in Monroe, Utah, has burned 75 square miles since July 13 and is 11% contained, officials said Thursday. Evacuation orders were issued Wednesday for several towns in the fire’s path, and scorched power poles prompted the shutoff of electricity in other nearby communities in south-central Utah.

Utah Gov. Spencer Cox declared an emergency Thursday as wildfires grew around the state and planned to visit Monroe on Friday.

Towering convection clouds known as pyrocumulus clouds have been spotted over Arizona’s blaze for seven consecutive days, fueling the fire with dry, powerful winds, fire information officer Lisa Jennings said. They form when air over the fire becomes superheated and rises in a large smoke column. The giant billowing clouds can be seen for hundreds of miles and can resemble an anvil.

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