What a Weak La Niña Could Mean for Winter Weather
Article 0 Comments The National Oceanic and Atmospheric Administration’s Climate Prediction Center says there is a 60% chance that a weak La Niña event will develop this autumn and could last until March. La Niña is part of a natural climate cycle that can cause extreme weather across the planet — and its effects vary from place to place. Although there is no guarantee how this La Niña will play out, there are some general trends. Experts say northern parts of South America could see more rain than usual. Southern regions of the U.S. and parts of Mexico could be drier than average. The northern tier of the U.S. and southern Canada could be wetter than average. La Niña is the cool phase of the El Niño-Southern Oscillation, a naturally occurring global climate pattern that involves changes in wind and ocean temperatures in the Pacific and can cause extreme weather across the planet. El Niño is the warm phase and happens when trade winds that typically blow across the Pacific toward Asia weaken, allowing warm ocean waters to pile up along the western edge of South America. But during La Nina, the trade winds intensify and cold water from the...