Cloud Weight It might seem surprising, but the average cumulus cloud, those cotton-like clouds you see on fair weather days, ...

NORFOLK, Va. — Technically called “cumulonimbus flammagenitus,” pyrocumulonimbus clouds are a rare weather phenomenon caused by intense heat. These towering clouds form when extreme heat ...

An average thunderstorm forms when warm air near ... of mountainous terrain can provide the oomph necessary for cumulonimbus clouds robust enough to generate lightning.

“Lightning strikes are increasing,” Kato said. “Nowadays, cumulonimbus clouds form over wide areas, and thunderstorms with heavy downpours can occur several times every few hours.

A frozen form of precipitation consisting of individual balls or lumps of ice called hail stones, produced from cumulonimbus or thunderstorm clouds. A bigger hail stone signifies a longer lifespan ...