Lowering
A general term for a lowered section of cloud beneath the storm base that has not yet organized into a persistent, rotating wall cloud. Distinguishing an ordinary lowering from a wall cloud requires watching for persistence and rotation over minutes, not seconds.
2 photos tagged
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Desert multicell near Mountainair, NM 
Open in the Storm Anatomy library →Storm mode Multicell cluster -
Supercell near Seymour, Texas 
Open in the Storm Anatomy library →Storm mode Classic supercell