We gratefully acknowledge the support of the National Science Foundation (Grant OCE-0236304). This work was partially supported by the FSU School for Computational Science and Information Technology, by a grant of resources on the IBM pSeries690 Power4-based supercomputer Eclipse. Acknowledgement is also made to the National Center for Atmospheric Research, which is sponsored by the National Science Foundation, for computing time used in this research. We thank William Smyth and the anonymous reviewer for their helpful comments.
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