I would like to thank D. B. Rao, L. Burroughs, V. M. Haliburton, A. G. Haliburton, J. Waldrop, G. Flato, B. Colman, and an anonymous reviewer for their editorial assistance. My thanks also to C. Sercy, NWS Alaska Region, for the software for producing the Web graphics. Thanks also to L. Burroughs for his help with the figures and implementation, and to L. Breaker for the code and explanations of vector correlation.
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