. Sudden Stratospheric Warming Events analyzed in an Isentropic-Coordinate Numerical Weather Prediction Model

Abstract
Time series of Eliassen-Palm (EP) fluxes show that wintertime sudden stratospheric warmings (SSWs) can profoundly alter the vertical propagation of planetary waves [1,2]. Hence, correct prediction of SSW occurrences is important for medium- and longer-term weather prediction. In this study, predictions of SSWs during the winter seasons of 1999-2014, carried out with the Flow-following Icosahedral Model FIM [3], are inspected for commonalities in the evolution of both minor and major warmings.