Definition

1. Noun:
   • A dense, towering vertical cloud associated with thunderstorms and severe weather: A cumulonimbus cloud is a type of cloud characterized by its great vertical height, dark appearance, and internal electrical charges that produce lightning and thunder. It is the only cloud type that can produce hail.

Usage

• Noun:
  • The cumulonimbus cloud on the horizon signaled an approaching storm.
  • Pilots are trained to avoid flying through a mature cumulonimbus cloud due to severe turbulence.
  • The rapid growth of a cumulonimbus cloud is driven by strong upward air currents.

Advanced Usage

• Meteorological Context: In weather forecasting, the term is used technically to describe the specific cloud structure responsible for convective weather phenomena.
  • The radar confirmed the presence of a cumulonimbus cloud, prompting a severe thunderstorm warning.
• Descriptive Use: Can be used descriptively to emphasize size, threat, or dramatic weather.
  • An anvil-shaped cumulonimbus cloud dominated the sky.

Variants and Related Words

• Cumulonimbus (n): The full, more technical name for the same cloud type. Often used interchangeably with "cumulonimbus cloud."
  • The meteorologist noted the development of cumulonimbus over the plains.
• Thunderhead (n, informal): A common informal term for the upper portion of a cumulonimbus cloud.
  • We could see the thunderhead rising in the distance.

Synonyms

• Thundercloud: A cloud, specifically a cumulonimbus, that produces thunder and lightning.
• Storm cloud: A general term for a cloud that brings stormy weather, often referring to cumulonimbus.

Related Phrases

• Anvil cloud: Refers to the distinctive anvil-shaped top of a mature cumulonimbus cloud.
  • The anvil cloud spread out, indicating the storm had reached its mature stage.

Noun

1. a dark cloud of great vertical extent charged with electricity; associated with thunderstorms