- A multicell thunderstorm type evolves as a series of stronger phases
- W030836Z
- A multicell thunderstorm type evolves as a series of stronger phases separated by weakening, or a short pause, while the next cell comes together. As each stage drifts downwind in the anvil it flattens and freezes slowly. The active updraft is always at the back (west side) and the latest one may be stronger, as suggested by the steep stair-step of strong, new towers.
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