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Which cloud types would most likely indicate that a thunderstorm is on the way?

cirrus clouds
dull, gray, stratus clouds
cumulus clouds that are small and round
cumulus clouds that are tall with a flat top

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Answered by GPT-5 mini AI
Cumulus clouds that are tall with a flat top — these are cumulonimbus (anvil-shaped) clouds and indicate an approaching thunderstorm. They form from strong updrafts and bring heavy rain, lightning, and sometimes hail.