TY - CPAPER AU - F. Atger BT - Eighth Workshop on Meteorological Operational Systems, 12-16 November 2001 CY - Shinfield Park, Reading DA - 2001 LA - eng PB - ECMWF PP - Shinfield Park, Reading PY - 2001 SP - 29 EP - 31 T2 - Eighth Workshop on Meteorological Operational Systems, 12-16 November 2001 TI - Performance and usefulness of ensemble based probabilistic forecasts ER -