Nation What is an El Niño, and what effects will this climate pattern have on spring weather? February 15, 2019February 15, 2019Brett Molina and Doyle Rice, USA TODAYComments Off on What is an El Niño, and what effects will this climate pattern have on spring weather? El Niño, the infamous climate pattern, has reappeared. How will it impact our weather this spring? What is La Nina? Oh, and what about global warming?