Report Abuse. A capping inversion is usually a situation where a layer of relatively warm air exists over a cooler lower air layer. Recall that an inversion is a layer of warm air above a cooler layer.ince the inversion caps the air, keeping it from rising, it suppresses convection. That said, this can be a good thing. The capping inversion can keep storms from developing early on in the day, allowing the surface to warm and become more unstable, and in some cases allow more moisture to advect in.