Short for cumulonimbus.
More example sentences
- In the early afternoon the cu-nims developed, but there was no rain here, just off to our east and north.
- The Alps were closed with cumulus and cu-nims but in Aosta a small part of the sky was free.
- It can lead to overall stability of the air mass or the development of cu-nims that dump lots of cool air down on unsuspecting pilots.