The NASA GEOS5 model has made significant progress in simulating the MJO, demonstrated by how closely its output (right panel) visually resembles satellite observation data (left panel; in both panels, MJO events are represented as lines of green, red, and purple sloping from top left to bottom right). Although continued model improvements are necessary, this effort constitutes a substantial leap in near-term climate modeling capability. (Credit: S. Tulich, NOAA)