cumulonimbus
cumulonimbus cloud
thundercloud

Lightning from an embedded cumulonimbus cloud may interact with the nimbostratus but only in the immediate area around it.

Even the smallest cumulonimbus clouds dwarfs its neighbours in comparison.

Blowing up from astern are gigantic clumps of cumulonimbus clouds.

In 1993, scientists discovered lightning bolts that shot upward from the top of a cumulonimbus cloud.

The thing that the symbol indicates is a cumulonimbus cloud.

This water vapour then rose upwards and created large cumulonimbus clouds.

Like other precipitation in cumulonimbus clouds hail begins as water droplets.

If enough instability is present in the atmosphere, this process will continue long enough for cumulonimbus clouds to form, which support lightning and thunder.

Near the end of the competition the weather deteriorated with cumulonimbus clouds and rain showers.

This can occur with any cumulonimbus cloud when instability is high.