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Conditional instability means the atmosphere is unstable

  • A.at every level regardless of saturation
  • B.only when the surface temperature is falling
  • C.only for parcels that have become saturated
  • D.only for parcels that remain unsaturated

Answer: C

An unsaturated parcel cools at the dry rate and is stable, but once it reaches its condensation level it cools more slowly and may become buoyant. The lifting needed to reach that level is what makes such a situation depend on a trigger.

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