The latest predictions show a La Nina weather system has developed in the Pacific Ocean and it’s expected to linger into spring — which may bring Iowa a colder winter and could influence the state’s weather well into 2021. Matt Rosencrans, a meteorologist at the Climate Prediction Center, says the center’s predictions are largely based on past observations.

Rosencrans says they are confident of the impacts at least through February, while beyond that, there’s still some uncertainty.