Yesterday I posted the latest seasonal outlook for winter for the US. One of the things it showed was the likely impact of the developing La Niña on this coming winter. But the Climate Prediction Center uses other things as well to make their predictions. Here at Climate.gov Tom DiLiberto discusses how trends are used in the predictions and why 15-year trends are the preferred length of time to use. You can read it at https://www.climate.gov/news-features/blogs/enso/another-non-enso-thing-affects-seasonal-forecasts.