- How and why anvil clouds form: reaching the stable layer
- W003175Z
- How and why anvil clouds form. Clouds bubble up to a certain level where they encounter a more stable layer, forcing the updrafts to slow down and spread downwind as an anvil cloud. In this case, the anvil is mostly unfrozen and will evaporate into a few Altocumulus patches. An anvil cloud has a more or less flat upper surface (the upper limit of the rising air) but may have a base height that changes as cloud matter erodes from below once the updrafts stop.
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