We gratefully acknowledge the computing support of David Vollaro of the University at Albany. We benefited from discussions with Dr. Jenni Evans of The Pennsylvania State University. Gridded ECMWF analyses were obtained from the National Center for Atmospheric Research. Funding for this research has been provided by the Office of Naval Research through Grants N00014-92-J-1532 and N00014-98-10599, and the National Science Foundation through Grants ATM-9612485 and ATM-0000673, awarded to the University at Albany, State University of New York.
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