Simplify the following text for a Grade 6 native English-speaking person.
Original: A funnel cloud is a funnel-shaped cloud of condensed water droplets , associated with a rotating column of wind and extending from the base of a cloud ( usually a cumulonimbus or towering cumulus cloud ) but not reaching the ground or a water surface .
Simplified: A funnel cloud is a funnel-shaped cloud of condense water droplets . They usually appear with a rotating column of air .