- The rain-free base of a storm cloud, with towers above but no rain
- W023015Z
- The rain-free base of a storm cloud has growing towers above it but no rain falling from it. It attaches to the main updraft on one side, trails to smaller cloud elements farther from the storm, and is accompanied by a change from warmer inflow to cooler outflow air and a wind shift as it passes over. For a supercell it also doubles as the flanking line.
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