- A line of showers forms by slow, steady propagation
- W013331Z
- A long line of showers along a wind-shift line forms by slow, steady propagation to the left of individual updrafts. As air enters the line from the south end, it rises smoothly and slowly until the clouds are tall enough to precipitate. With each heavier shower and its outflow, that process steps upwind a little to enhance the next cell on the line.
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