How to pronounce “cumulonimbus” in English

That came from a cumulonimbus cloud.

But you remember we saw the cumulonimbus with the hail and the thunderstorm.

That occurs in these clouds-- cumulus-- cumulonimbus.

And we get pretty violent clouds that are called cumulonimbus.

And the clouds we saw at the equator there-- they are cumulonimbus clouds.