CREDIT NIAR / SCIENCE PHOTO LIBRARY CREDIT NIAR / SCIENCE PHOTO LIBRARY
Towering cumulonimbus cloud developing over a mountain. Cumulonimbus clouds have distinctive towers topped with a flattened anvil, and typically produce heavy rain and thunderstorms. The flat anvil forms as rising air reaches the tropopause, the boundary layer between the troposphere and the stratosphere. The tropopause is a temperature minimum, and the rising air cannot rise into the warming stratosphere, so it spreads out at the boundary, forming the anvil shape. Filmed in the Philippines.
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