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Which additional sounding feature supports a strong cold pool?

  • A.A very high cloud base
  • B.A layer of strong static stability immediately above the level at which the downdraught originates aloft
  • C.A mid-level minimum of equivalent potential temperature
  • D.A mid-level maximum of equivalent potential temperature, which supplies the energy driving the descent below

Answer: C

Air with low equivalent potential temperature at mid-levels descends readily once cooled by evaporation, so a pronounced minimum indicates the potential for a vigorous cold pool and strong outflow winds. Forecasters look for that minimum explicitly when assessing squall line potential. A high cloud base contributes as well, which makes the third option a genuine secondary factor. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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