CERFACS organises the 4th ENES Workshop on High Performance Computing for Climate and Weather on April 6-7 in Toulouse under the auspices of the EU project IS-ENES2 and the Centre of Excellence ESiWACE. This international workshop will gather about 80 scientists and engineer around different topics in High Performance Computing such as the European HPC ecosystem, innovative development and today high-resolution models, and new paradigms (languages, standards, next-generation models, …).