I don’t want to get out ahead of things, because we’re still trying to understand what the current gonzo El Niño means for global weather, but the monthly outlook from the U.S. Climate Prediction Center now has the odds at 50-50 that we’ll be in La Niña by fall:

Most models indicate that El Niño will weaken, with a transition to ENSO-neutral during the late spring or early summer 2016 (Fig. 6). Thereafter, the chance of La Niña conditions increases into the fall. While there is both model and physical support for La Niña following strong El Niño, considerable uncertainty remains.

La Niña by fall

A reminder that El Niño tilts the odds toward wetter weather across the southern tier of U.S. states, La Niña does the opposite, and the Colorado River Basin as a whole is a coin toss.