- Soft thunderheads where a stream of air rises into mountains
- W031908Z
- Soft boiling clouds promise change in a desert landscape. These soft thunderheads are forming where a stream of air rises into mountains, one tower after another in about the same place. There is no buoyant regeneration so each tower is spent as soon as it has reached its maximum height. In the dry air aloft, bright tops become grayer quickly as rapid evaporation along with freezing disperses the cloud particles.
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