A dark cloud of great vertical extent charged with electricity; associated with thunderstorms.
1 The surrounding hills still have their forests; cumulonimbus clouds towering over them like clenched fists.
2 Specifically, the scientists were looking at the temperatures at the very tops of each storm's cumulonimbus clouds .
3 Cumulonimbus Clouds Super fluffy, cotton-like balls, shaped into an anvil, are a harbinger for lightning, hail, and tornadoes.
4 During one of these flights, small fluctuations were observed in the vicinity of the aircraft with formation of Cumulonimbus clouds .
5 And we also know the process occurs most spectacularly in the large towering cumulonimbus clouds that we associate with thundery conditions.
6 They realised that tropical cumulonimbus clouds could tower to 15km tall, so high they reached the top of the lower atmosphere.
7 The hot air rises and dense cumulonimbus clouds form as towering plumes reaching up to 12 km (39,000 ft) high.
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