- Rare pattern of Mammatus clouds with mamma ridges and grooves
- W873419P
- Wide view looking up at the backside anvil of a severe storm with Mammatus clouds arranged in a rare cloud pattern. The cloud’s sloped underside is marked with many grooves and ridges leading down to mamma pouches lower in the anvil. The lines could be imagined as “draining” air down the slope along the clear-cloudy interface. See close-up in W873424Z.
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