Which of the following best describes a thunderstorm anvil?

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Multiple Choice

Which of the following best describes a thunderstorm anvil?

The key idea is that the thunderstorm anvil is the flat, spreading top of a cumulonimbus cloud. It forms when the updrafts lift air to the upper levels of the troposphere, where temperatures are cold enough for the air to spread horizontally under the influence of the surrounding environment and any outflow from the storm. That horizontal spreading at the top creates the characteristic anvil shape and signals a mature thunderstorm with strong convection and significant upper-level dynamics. Other descriptions describe different features: a vertical column extending above the tropopause would be an unusually tall core or an overshooting top, not the flat spreading cap. The underside of the cumulonimbus is associated with the rain-formation region near the cloud base, not the top. A thin halo around a cloud formed by ice crystals refers to a halo phenomenon, not storm structure.

The key idea is that the thunderstorm anvil is the flat, spreading top of a cumulonimbus cloud. It forms when the updrafts lift air to the upper levels of the troposphere, where temperatures are cold enough for the air to spread horizontally under the influence of the surrounding environment and any outflow from the storm. That horizontal spreading at the top creates the characteristic anvil shape and signals a mature thunderstorm with strong convection and significant upper-level dynamics.

Other descriptions describe different features: a vertical column extending above the tropopause would be an unusually tall core or an overshooting top, not the flat spreading cap. The underside of the cumulonimbus is associated with the rain-formation region near the cloud base, not the top. A thin halo around a cloud formed by ice crystals refers to a halo phenomenon, not storm structure.

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