Officials predict higher chance of wetter, colder La Niña winter

La Niña is caused by cooling of ocean surface temperatures in the Pacific Ocian, causing a wave-like jet stream with variable strength, generally entering North America in the northwest U.S. and southwest Canada.

This causes gives increased storminess across large parts of central North America and drier conditions across the southern states.

NOAA said that La Niña episodes tend to last one to three years, and 2020 was also a La Niña year.