Wall cloud
An abrupt lowering hanging below the rain-free base, marking the strongest concentrated inflow. A persistent wall cloud that rotates and rises is one of the most reliable pre-tornadic visual features.
8 photos tagged
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EF-3 Tornado Under a Giant Supercell, Pink, OK 
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Supercell at Dusk near White Deer, TX 
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Supercell near Lexington, OK 
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HP Supercell near Littlefield, TX 
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Tornado near Punkin Center, Colorado 
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Classic Supercell near Minneapolis, KS 
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HP Supercell near Memphis, Texas 
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SW Oklahoma Classic Supercell 
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