IF GEFS correct, big trough in NW PAC during Week 2 (Image #1) (MJO-related?) will generate strong vert wave propagation there (Image #2), decelerating the upper vortex (Image #3). Lots of uncertainty, though, in whether this will occur (Image #4, vertical bars). Fun times. :) pic.twitter.com/SpNpJrPS3X

— Jason Furtado (@wxjay) November 25, 2017