tokens: I thank the anonymous referee for helpful comments that improved the paper. I also thank Feng Chen and Sarah Gibson for reading the paper and for helpful comments. This work is supported in part by the Air Force Office of Scientific Research grant FA9550-15-1-0030 to NCAR. NCAR is sponsored by the National Science Foundation. The numerical simulations were carried out on the Cheyenne supercomputer at NWSC under the NCAR Strategic capability project NHAO0011 and also on the DOD supercomputers Thunder at AFRL and Topaz at ERDC under the project AFOSR4033B701.
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