E. C. would like to thank Dr. I. Held for providing the GFDL dynamical core, which was adapted into the nonlinear storm-track model. The authors thank the anonymous reviewers for helpful comments. E.C. was supported by NSF Grant ATM0296076 and NOAA Grant NA16GP2540. P. Z.-G. was supported by the Visiting Scientist Program at the NOAA/Geophysical Fluid Dynamics Laboratory administered by the University Corporation for Atmospheric Research.
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