- *Stratosphere warming watch* Strong signals now emerge for a possible disruptive Sudden Stratospheric Warming event in early January 2021. These SSW events can impact the course of Winter, with a cascading effect as the Polar Vortex collapses. https://www.severe-weather.eu/global-weather/stratosphere-major-winter-warming-watch-january-2021-fa/ 93 comments worldnews