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Too much precipitation can be forecast over mountainous coasts and islands.  At a location on a mountain the model height can be significantly lower than the true height of the of the land surface.  See a schematic of model representation of orography and Tenerife as an example of a mountainous island.  Thus temperatures at the location can be forecast to be too warm.  This can then result in in a reduction of CIN from true values and the release of convection, possibly with large MUCAPE, over the mountains.

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