The record high MJO amplitude per RMM is March 16, 2015: 4.62 sigma. This GFS Ensemble prediction rivals that of the strongest MJO per RMM on record. It would certainly be the strongest MJO event per RMM in January (old record is Jan 31, 2018: 3.93 sigma). https://t.co/vixzQbSkE0

— Mike Ventrice (@MJVentrice) December 26, 2018