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A cumulonimbus cloud developed when air is lifted to a point that it is warmer, and thus less dense than its surroundings, causing it to continue to rise. Condensing water vapor prevents the rising air from cooling to quickly. The air will continue to rise until it encounters a warmer layer of air. Sometimes and inversion, somtimes it is the stratosphere.

In the upper part of the cumulonimbus cloud ice crystals form. These gradually grow into snowflakes and small pellets called graupel. The snow or graupel then falls, but melts to form rain before reaching the ground The rain causes downdrafts, which produce the wind associated with thunderstorms. Finally, as ice crystals bump into each other, electrons get transferred, and different regions of the storm develop positive and negative charges. Eventually these charge differences are releases as enormous bolts of static electricity called lightning. The lightning superheats the air instantly, generating a shockwave that we hear as thunder.

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13y ago

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