Paradoxically, it is possible for stability to be created within rising air, as well as by subsidence. The reason is that a subsidence inversion occurs within the free atmosphere, far from the ground, whereas orographic stability is caused when dry air is forced to rise over a high mountain range and squeezed against the stratospheric inversion. As a result, the air at the lowest levels is raised (i.e. cooled) more than the upper air of the layer, so that stability increases. inversion layer is usually a few hundred metres above the surface, becoming lower towards evening.
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