The authors thank W. Higgins and W. Shi at NCEP for making the URD available to this study. This study was supported by NOAA (Grants NA00AANRG0201, NA06GP0376, NA03OAR4310012, and NA17RJ1231) and NASA (Grants NAG5-13248, NAG5-11363, NAG5-11738, and NAG8-1875). The views expressed herein are those of the authors and do not necessarily reflect the views of NOAA or NASA.
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