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Which of the following combinations is most characteristic of unstable air behind a cold front?
  • A
    Good visibility between showers, showery precipitation, cumuliform clouds
  • B
    Poor visibility, continuous precipitation, stratiform clouds
  • C
    Good visibility between showers, persistent precipitation, stratiform clouds
  • D
    Poor visibility, intermittent precipitation, cumuliform clouds

Refer to figures.

Below you can find the weather behind a cold front.

BEHIND THE COLD FRONT:

  • Surface wind: Steady or slight veer to North-West, speeds decrease.
  • Temperature: remains steady (cold).
  • Pressure: increases slowly.
  • Cloud: Broken to overcast, base lifting, occasional Cumulus and Cumulonimbus.
  • Precipitation: Same as at the cold front – heavy/showers rain or snow showers, later occasional showers from Cumulus and Cumulonimbus.
An active cold front with unstable warm air will be associated with cumuliform clouds => producing showery precipitation.
  • Visibility: very good, except in showers.

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