Clouds are classified by basic characteristics like altitude, appearance, and how they form. The classifications by altitude are:
High - the bottom of the cloud is 18.000 feet or above
Middle - between 7ooo and 18,000 feet and
Low - below 7000 feet
The thunderstorm producing clouds are actually multi-level clouds called Cumulonimbus, and can have a base as low as 3000 feet, and top out at up to 60,000 feet!
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The sky version of "Old Faithful"
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This accessory cloud floated out of cumulus clouds in the shape of a feather or maybe an angel wing.
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These clouds seemed to virtually explode!
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