The session will focus on the most recent developments in the field of ensemble techniques, with applications to data-assimilation and high resolution (1 km scale) forecast systems. As such it may provide a platform for exchanging ideas on how to create and use an ensemble system for forecast lead times ranging from hours to weeks. In particular the use of ensembles in predicting hazardous weather from several hours ahead will be of interest. The conveners invite further papers on various issues associated with Ensemble Forecasting for weather prediction, such as:

i) representation of initial uncertainties in Global and Limited-Area Ensemble Prediction Systems;
ii) representation of model or boundary uncertainties in Global and Limited-Area Ensemble Prediction Systems;
iii) results from experiments including major observational campaigns such as MAP D-PHASE, COPS, ETReC07;
iv) use, verification and calibration methods of Ensemble Prediction Systems.

In addition to meteorological verification, multi-disciplinary (e.g. hydrological) verification studies of high impact phenomena are encouraged to participate.