- A weakening of the cold tropical Pacific ocean phase, the La Nina, is now being observed. A new warming wave is strengthening at depth below the ocean surface, signaling that a shift in power is likely in the tropical Pacific from Summer into Autumn 2021. https://www.severe-weather.eu/global-weather/enso-el-nino-la-nina-forecast-weakening-spring-usa-fa/ 7 comments worldnews