Per Don Sutherland:
“Beyond Phase 8, the MJO forecast becomes more muddled. The EPS rapidly takes it to phase 5, mainly at a low amplitude by January 21. The GEFS takes it to a low amplitude and then loops it back into Phase 7. Based on a blend of the guidance, the baseline scenario is that the MJO would gradually move through Phase 8 at a high but lowering amplitude.”