overshooting top

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A dome of cloud that protrudes above the general level of the anvil top of a cumulonimbus incus, a multicell storm, or, in particular, a supercell thunderstorm. It is a sign of an extremely vigorous updraught and thus of potentially severe weather beneath the storm. In the strongest storms updraughts may penetrate as much as 4 km above the level of the capping inversion (which is frequently the tropopause), but 1 km is a more common value.

Subjects: Meteorology and Climatology.

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