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A cold pool at the surface beneath a convective storm is produced by

  • A.the compression of air within the storm updraught
  • B.evaporatively cooled downdraught air spreading out
  • C.the direct radiative cooling of the ground below
  • D.the melting of hail lying on the surface

Answer: B

Cooled dense air reaches the ground and spreads as a density current. Its leading edge, the gust front, frequently triggers new convection and so propagates the system. Cold pool dynamics govern how a squall line advances.

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