3 ms·
Seems silly, you could probably find another specific set of cloud criterion and label it rarest clouds in the world.
by rubatuga 4y ago
Seems silly, you could probably find another specific set of cloud criterion and label it rarest clouds in the world.
- sandworm101 4y agoAt best, these are rare in the context of SF norms. They are also more common than described, just that normally they go unobserved. We only really notice them at dawn when they get hit by sunlight early due to altitude.
- mannykannot 4y agoThe category is not an arbitrary one, primarily because they are higher than other weather phenomena, being in the mesosphere. In fact, there is a hypothesis that they did not occur (or perhaps only occasionally even by the standard of their current rarity, such as after large volcanic explosions) until the industrial revolution.