This study is supported by the NSF Grant ATM-9416954. We thank Dr. M. Murakami (the Typhoon Research Department of Meteorological Research Institute at Tsukuba, Japan) for his assistance in accessing the tropical cyclone track data. Comments made by Dr. Chris Landsea and an anonymous reviewer were helpful in clarifying some issues discussed in this paper. The typing support by Mrs. Reatha Diedrichs and editorial assistance by Mrs. Susan Carr are highly appreciated.
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