We wish to thank Steve Belcher for directing us towards the articles of Frank Smith on the triple-deck theory of boundary layer separation. We are also grateful to Maarten Ambaum, Roger Samelson, and two anonymous reviewers for comments that lead to a significantly improved manuscript. The financial support of the Natural Environment Research Council (GR3/10157) and, previously, the U.K. Meteorological Office (met1b/2170) is gratefully acknowledged.
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