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CAPE (or CAPEθe to distinguish it from MUCAPE) is computed assuming a pseudo-adiabatic parcel ascent (all condensate is removed as soon as it forms) using the equivalent potential temperature (θep), and the environmental saturated equivalent potential temperature (tθesaesat). 

CIN

Convective Inhibition (CIN) gives information on the energy required to provide sufficient lift to overcome any capping inversion and to release the CAPE.  CIN is assessed from the model atmosphere in a similar way to the process to identify CAPE.  At any given grid point the convection scheme inspects the temperature structure of the model atmosphere progressively from the surface upwards and if there exists a level of free convection (LFC) it evaluates the energy required for a rising parcel to overcome the inhibiting effect of the underlying temperature structure.   

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