cumulonimbus

• The sky was violently alive: heavy gray cumulonimbus, speeding white cirrus, weighty black altostratus, churning nimbostratus, clouds so dense and volatile that one could almost hear them rumbling in on enormous wheels. —  EQMM,November2007
• Lightning is a phenomenon that is created by a separation of positive and negative electrical charges in cumulonimbus clouds, and that can occur in both a positive and negative fashion. —  WRAL.com Top Stories
• Do you know what the words nimbostratus, altocumulus and cumulonimbus describe?
• The haze behaves somewhat like particles in the tops of thunderheads on Earth (known as cumulonimbus anvils) or in the ash plumes from large volcanic eruptions, which rise into the upper atmosphere and spread around the world. —  Scientific Blogging
• The haze behaves somewhat like particles in the tops of thunderheads (known as cumulonimbus anvils) on Earth or in the ash plumes from large volcanic eruptions, which rise into the upper atmosphere and spread around the world, Wong said. —  SpaceRef Top Stories

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