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A cumulonimbus incus (Latin ''incus'', "anvil") is a cumulonimbus cloud which has reached the level of stratospheric stability and has formed the characteristic flat, anvil-top shape. They can form into supercells resulting in severe storm phenomena such as tornadoes, flash flooding and downbursts. The cumulonimbus incus is formed when the updraft is strong and vigorous. They form from cumulonimbus calvus which have puffy tops. A cumulonimbus incus means that the thunderstorm is in its mature stage and it may bring severe weather. So if a cumulonimbus incus is sighted, people in its path must take shelter immediately to protect themselves from multiple severe weather threats. Cumulonimbus capillatus is a sub-form of cumulonimbus incus. ==Hazards== A cumulonimbus incus is a mature thunderstorm cloud and it can produce many dangerous elements. *Lightning; this storm cloud is capable of producing bursts of cloud to ground lightning. *Hail; hailstones may fall from this cloud if it is in a highly unstable environment (which favors a more vigorous storm updraft). *Heavy rain; the cloud may drop several inches of rain in a short amount of time. This can cause flash flooding *Strong wind; gale force winds from a downburst may occur under this cloud. *Tornadoes; in severe cases (most commonly with supercells), it can produce tornadoes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「cumulonimbus incus」の詳細全文を読む スポンサード リンク
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