On the basis of a preliminary version of this paper, the first author (LTN) was named as the recipient of the American Meteorological Society’s 2009 Father James B. Macelwane Award for best undergraduate research paper; he thanks the Society for its recognition and the accompanying stipend. Our thanks are given to Yolanda Roberts for invaluable preliminary research. This work was partially supported by the Northeast Regional Climate Center under NOAA Contract EA133E07CN0090.
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