Both the weather and climate are the result of two coupled non-linear dynamical systems:  the Atmosphere and the Oceans.

There need not be a Bear for there to be an occasional, or even repeating, major deviation from what seems to be the norm. 

And, of course, El Niño/La Niña are not external to the weather or climate systems, they are part and parcel of those systems.  As are the loops and twists in the Jet Stream. 

I would not have recommended using any projections using the mostly discredited RCP8.5.