The first C20C+ “Hackathon” was held December 7-11, 2015 at the Computational Research Division of the Lawrence Berkeley National Laboratory. This get-together was a true working meeting with scientists learning what is in the C20C+ database of simulations and how to access it. Twelve scientists from around the world, including Japan, Australia, Great Britain, Germany, South Africa and the United States spent the week in a room full of computer terminals sharing ideas and experiences about extreme event attribution. Well over half of the attendees were early career scientists. Led by CASCADE team member, Dáithí Stone, the C20C+ Event Attribution Subproject is building a multi-model database of simulations target for extreme event analysis. Currently containing over 2PB of model simulations from four different modeling groups, the database is continuing to grow from both additional modeling groups and simulations. C20C+ data is available now, without restriction from the website http://portal.nersc.gov/c20c/ . Questions about the C20C+ Detection and Attribution Project  should be directed to Dr. Stone at dstone@lbl.gov .

C20C+ hackers toured the new Computational Research and Theory (CRT) Facility and saw the latest NERSC supercomputer cori.nersc.gov on which many high resolution C20C+ simulations will be performed.