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Strongly developed cumulus clouds are an indication of:
  • A
    the presence of warm air aloft.
  • B
    the presence of a low level inversion.
  • C
    poor surface visibility.
  • D
    instability in the atmosphere.

Clouds are formed by air being lifted and cooled adiabatically => until the condensation level, where saturation is reached, and water vapour condenses and clouds form.

- The type of clouds which will be formed depends on the type of air mass:

  • stable (layer type of clouds will form - STRATIFORM) - great horizontal extension, little vertical development: ST, SC,AS,NS,CI,CS.
  • unstable (heap type of clouds - CUMULIFORM) - extensive vertical extension: CU,TCU,CB,AC,CC.
Note:“poor surface visibility.” And “the presence of a low-level inversion.” INCORRECT. Related to stable atmosphere.
“the presence of warm air aloft.” INCORRECT. Stability increases when lower layers are cooled/Upper layers are warmed.

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