Operational ALADIN ITT for the next computer system Impact of mesoscale 3DVAR initial conditions on ALADIN over Slovenia Experiments with 3DVAR RUC Flash floods on 18 September 2007

minimum 10x computing power compared with the present system, faster interconnect, more memory Lookong for 30x (just in line with Moore's law) cluster type of a system on Interconnect Infiniband –256 cores –1GB/core of memory o cluster management software and queuing system ITT for a new computer system: May 2007 benchmarking based on AROME deliverery and installation: November 2007 ITT for the next computer system

Impact of mesoscale 3DVAR 1 month – June 2006 differences quite small, except for precipitation differences mostly over complex terrain and intermediate valleys and basins, no striking improvements of local data assimilation found for used dataset some cases where initial conditions do play an important role identified benefits of high resolution initial wind and moisture fields for correct prediction of precipitation events. A/HU A/SI An ARP