Use "cumulonimbus" in a sentence

1. Weather Bureau in the 1950s, and denotes the fluffy cumulonimbus clouds that people find attractive

2. They had had one or two short showers before, but that day the clouds massed high in great peaks of cumulonimbus that spread and covered the whole sky so that it grew dark

3. Cumulonimbus clouds are low thunder clouds

4. They apparently develop when air at the surface has been warmed and a column of air descends from the base of cumulonimbus storm clouds above