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CIN 

This is a surface based measurement of Convective INhibition (CIN) or what is sometimes more commonly referred to as the strength of the cap.  The value is capped off at 500 J/KG and in cases where there is no surface based CAPE available this parameter is set to 500 J/KG.

In general, the Cap is said to be breakable when CIN is 20 J/Kg or less.