The paper was jointly written by Julia H. Keller, Christian M. Grams, and Michael Riemer, based on contributions from all coauthors. We thank John Gyakum for his support in initiating this work, as well as Clark Evans for comments that helped to improve the manuscript. Well-thought-out and thorough comments by five anonymous reviewers and the editor David Schultz on a previous version of the manuscript provided very helpful guidance for improving the content and tangibility of this review. CMG, JHK, and MR would like to thank Sarah Jones for sparking their interest in ET and for making parts of the work presented here happen. The contribution by CMG was made while he held a Swiss National Science Foundation (SNSF) Ambizione fellowship under Grant PZ00P2_148177/1 and finished under Grant VH-NG-1243 of the Helmholtz Association. MR acknowledges support from the subproject “A4: Evolution and predictability of storm structure during extratropical transition of tropical cyclones” of the Transregional Collaborative Research Center SFB/TRR 165 “Waves to Weather” program funded by the German Science Foundation (DFG). Parts of the results presented in this review have been produced within the German PANDOWAE (FOR896) project, funded by DFG as a contribution to the WMO World Weather Research Programme THORPEX. Coauthors acknowledge the following support: Bosart from NSF (AGS-1240502 and AGS-1355960); Doyle and Reynolds from the Chief of Naval Research through the NRL Base Program PE 0601153N and the ONR PE 0602435N; Quinting from the Australian Research Council Centre of Excellence for Climate System Science (CE110001028); Torn from NSF (ATM-1461753); and Zhang from ONR (Grant N000140910526). This review was partly initiated at the World Meteorological Organization’s Eighth International Workshop on Tropical Cyclones in 2014.
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, , Agustí-Panareda, A. , C. D. Thorncroft , and G. C. Craig S. L. Gray 2004: The extratropical transition of Hurricane Irene (1999): A potential-vorticity perspective. Quart. J. Roy. Meteor. Soc., 130