Rain-free base
The flat, dry cloud base directly beneath the updraft, offset from the precipitation shield. A crisp, moist rain-free base is one of the earliest visual signs of a developing mesocyclone.
8 photos tagged
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Supercell at Dusk near White Deer, TX 
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LP Supercell over the Texas Panhandle 
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Supercell near Seymour, Texas 
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Supercell becoming undercut south of Salina, KS 
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High-based supercell near Vaughn, New Mexico 
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HP Supercell with a large, flat base in North Texas 
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Classic Supercell near Minneapolis, KS 
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High-Based Supercell Near Miami, TX 
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