Two wildfires burning in the western United States are so hot that they're spurring the formation of "fire clouds" that can ...

The wildfire that destroyed the historic Grand Canyon Lodge​ earlier this month has expanded in recent days, fueled by hot, ...

Pyrocumulonimbus clouds look much darker than typical clouds because of their large amounts of smoke and ash. They can reach heights of 50,000 feet and generate their own systems of thunderstorms.

The Vatican used to use ingredients like tarry pitch (a resin made from coal and nowadays used as a binder in asphalt products) to color the smoke, but due to health concerns over burning such a ...