The authors are grateful to J. Allen and M. Whitney for helpful comments and suggestions; P. M. Kosro kindly provided the land-based, high-frequency radar data used for estimating the Rossby number upstream of Heceta Bank. This research was supported by the National Science Foundation under Grant OCE-9907854. Author RC was supported by the Brazilian National Research Council (CNPq Grant 200147/01-3) and by the Inter American Institute for Global Change Research (IAI), through project SACC (CRN-061). We dedicate this paper to the memory of Dr. David C. Chapman, for this is just the type of coastal geophysical fluid dynamics problem that he loved to explore.
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