This work was partly supported by the Modeling, Analysis, and Prediction (MAP) Program in the NASA Earth Science Division and by NSF Grant ATM-0754332. The authors thank William Boos, David Romps, and Christopher Walker for helpful comments and suggestions during the drafting of this paper. Comments by Matthew Wheeler, David Raymond, and an anonymous third reviewer also improved the paper. The discussions on the moist static energy budget and wave-CISK were prompted by discussions with Adam Sobel, Chris Bretherton, and David Raymond. Comments by Chris Bretherton considerably sharpened our view on wave-CISK.
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