WATCH: Check out the formation of a pyrocumulonimbus cloud above the bushfire at Sedgerley (north of Inglewood) on Monday in this timelapse. The footage shows intense fire behaviour which leads to the development of a cloud above the fire, known as a pyrocumulus. This has a feedback effect on the fire, leading to difficult firefighting conditions on the ground. Because the clouds above the fire are in unstable air, it triggers a thunderstorm, complete with lightning. This fire-induced thundersto