Research Collection Journal Article How an uncertain short-wave perturbation on the North Atlantic wave guide affects the forecast of an intense Mediterranean cyclone (Medicane Zorbas) Author(s): Portmann, Raphael; González-Alemán, Juan Jesús; Sprenger, Michael; Wernli, Heini Publication Date: 2020-10-19 Permanent Link: https://doi.org/10.3929/ethz-b-000456727 Originally published in: Weather and Climate Dynamics 1(2), http://doi.org/10.5194/wcd-1-597-2020 Rights / License: Creative Commons Attribution 4.0 International This page was generated automatically upon download from the ETH Zurich Research Collection. For more information please consult the Terms of use. ETH Library Weather Clim. Dynam., 1, 597–615, 2020 https://doi.org/10.5194/wcd-1-597-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. How an uncertain short-wave perturbation on the North Atlantic wave guide affects the forecast of an intense Mediterranean cyclone (Medicane Zorbas) Raphael Portmann1, Juan Jesús González-Alemán2, Michael Sprenger1, and Heini Wernli1 1ETH Zurich, Institute for Atmospheric and Climate Science, Zurich, Switzerland 2Complutense University of Madrid, Department of Earth Physics and Astrophysics, Madrid, Spain Correspondence: Raphael Portmann (
[email protected]) Received: 22 August 2019 – Discussion started: 28 August 2019 Revised: 15 September 2020 – Accepted: 25 September 2020 – Published: 19 October 2020 Abstract. Mediterranean cyclogenesis is known to be fre- ment of the PV streamer in more than a third of the ensem- quently linked to ridge building over the North Atlantic and ble members resulted in a very different cyclone scenario. subsequent anticyclonic Rossby wave breaking over Europe.