- Classic anvil knuckles where storm updrafts hit the stable layer
- W854427S
- A classic case of anvil knuckles. An extra strong updraft has hit the ceiling where a stable layer counters buoyancy, slowing down the upward air motion. This forces the cloudy air to squirt outward. The knuckles are a natural way of distributing the fluid motion to account for small variations in pressure and density with the spreading air currents.
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