- A shelf cloud or Arcus accompanies the gust front of a high-based storm
- W000678Z
- A shelf cloud or Arcus accompanies the gust front of a high-based storm. It is moving forward slowly since the cool air is being held in check by warmer air feeding toward and along the axis. This is forming a series of cells (note the two rounded wider parts within the axis) which will grow into new showers.
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