ACCESS-S2: the upgraded Bureau of Meteorology multi-week to seasonal prediction system oleh Xiaobing Zhou, Yi Xiao, Mei Zhao, Griffith Young, Yonghong Yin, Hailin Yan, Matthew C. Wheeler, Guomin Wang, Claire M. Spillman, Grant Smith, Paul Smith, Li Shi, Andrew G. Marshall, Eun-Pa Lim, Shuhua Li, Debra Hudson, Harry H. Hendon, Morwenna Griffiths, Christopher Down, Catherine de Burgh-Day, Oscar Alves, Robin Wedd