Mesocyclone
The rotating updraft column of a supercell. A mesocyclone is inferred from persistent visual features like a wall cloud, striations, and a rain-free base rather than seen as a single shape. Sustained rotation of these features together confirms its presence.
5 photos tagged
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EF-3 Tornado Under a Giant Supercell, Pink, OK 
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Supercell near Lexington, OK 
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HP Mothership Supercell near Childress, TX Open in the Storm Anatomy library →
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Tail-End Charlie Supercell at the edge of a convective line 
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Supercell with Pronounced Clear Slot 
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