The COMESEP Alert System was built under the three-year EU FP7 COMESEP (COronal Mass Ejections and Solar Energetic Particles: forecasting the space weather impact) project. Tools for forecasting geomagnetic storms and solar energetic particle (SEP) radiation storms were developed, validated and implemented into an operational space weather alert system that runs without human intervention. The COMESEP Alert System is triggered by solar phenomena such as CMEs and solar flares. After the automatic detection in solar data of any of these transients, the different modules of the system communicate in order to exchange information. Overall the system produces a series of coherent alerts that are then displayed online. The system provides notifications for the space weather community.