Abstract
The Laplacian of terrain height over Central Asia correlates well with planetary boundary layer (PBL) pressure perturbations during summer. Low-pressure perturbations favor concave terrain forms, high pressure perturbations appear to go with convex terrain forms. Some of these PBL perturbations have been found to trigger severe weather over Tibet and over eastern China. This observation leads to the speculation that large-scale orographic features may cause the establishment of “severe weather alleys” downwind.
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