Once enough cooling takes place, the rain and hailstones being held high in the thunderstorm cloud drop to the ground - as a ...

A massive clean up is underway in Western Australia after a second microburst in just three weeks pummelled the south west.

"A tornado has that rotational structure to it, it's a funnel cloud that extends down from the main thunderstorm system, whereas a microburst is brought about just by rushing cold air," she said.