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Discussion

The strongest recent evidence for orographic seeding came from

  • A.a survey of the impressions of local operators
  • B.modelling studies unsupported by any observations of the real cloud
  • C.radar tracking of seeding signatures from release to snowfall
  • D.comparison of two consecutive winters of rainfall

Answer: C

Observing the plume from release through ice growth to snowfall closes the causal chain. This represented a considerable advance over purely statistical arguments. The chain from release to snowfall was observed throughout.

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