- Wide view of an approaching shelf cloud on a severe storm
- W990986S
- Wide view of an approaching shelf cloud or Arcus along a gust front ahead of a severe storm. Convergence and lift ahead of the storm forms a thickening cloud sheet, seen as parallel lines or fingers of darker cloud against the lighter anvil. Below this are various layers aligned along the advancing cool outflow. (See W990992Z for a close-up.)
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