Can rapid October snow advance in Siberia predict your winter? This is a famous forecast signal for cold winters in the U.S. and Europe, so we tested it across 47 winters of data and 4 different datasets. The results were surprising, and they change how we should read this October’s snow surge as we head into Winter 2026/2027. https://t.co/tfzLvfCk6e

— SWE | severe-weather.eu (@severeweatherEU) October 9, 2026