ECMWF Severe Event Catalogue for Evaluation of Multi-scale Prediction of Extreme Weather

Since 2013 ECMWF has been collecting material about severe weather events into a web catalogue,
with the main aim to keep evaluation material for later use in order to better understand the performance. In this report we describe the outline of the cases in the catalogue and we discuss the lessons learnt so far from the evaluation in terms of multi-scale predictability of severe weather. By studying the cases, we can identify processes that are key for the prediction on different time-scales. By evaluating these processes we can learn about current bottlenecks for severe-weather prediction.