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  • High-level cloud cover (HCC). - Cloud integrated from top of the atmosphere down to 450hPa*.
  • Medium-level cloud cover (MCC). - Cloud integrated from 450hPa* down to 800hPa*.
  • Low-level cloud cover (LCC). - Cloud integrated from 800hPa* down to the surface.

  • But note: the Total Cloud Cover (TCC) is cloud layers integrated from the top of the atmosphere down to the surface with overlap assumptions based upon global observations.  The degree of randomness in the overlap is dependant upon distance between layers.   HenceHence TCC  ≤  HCC + MCC + LCC.

* strictly pressure levels are not used, but actually the IFS model levels that correspond to the given pressure levels in a standard atmosphere.  This means that one can get low cloud over the Tibetan plateau, for example, because we are using there the same IFS model levels to divide up cloud layers that we use the over open ocean.

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