Which is a common first indicator of an approaching thunderstorm?

A too hot
B heavy wind
C a buildup of dark clouds
D lightning

Correct Answer: a buildup of dark clouds

The first indicator of an approaching thunderstorm is a buildup of dark clouds.

A thunderstorm is a storm with lightning and thunder; it is usually produced by heavy rain, gusty wind, and the cumulonimbus cloud. The thunderstorm is made up of moisture, unstable air and lift.

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