From Climate Central (Andrew Freedman):
La Niña conditions, which have played a key role in influencing recent winter weather in the U.S. and other parts of the world, are beginning to wane, and will likely be gone by early to mid-summer, according to the latest outlook from forecasters at the International Research Institute for Climate and Society (IRI). La Niña is a natural climate phenomenon that is characterized by cooler than average waters in the equatorial Pacific Ocean. Like its sibling El Niño, La Niña influences global weather patterns by altering air pressure and predominant winds over the Pacific, which have ripple effects — known to meteorologists as “teleconnections” — in far flung locations. It can make certain conditions — such as drought in the American Southwest — more likely to take place, while lessening the odds of other outcomes.