
Meteorologists are monitoring the unusually early weakening of the polar vortex and the large circulation of cold air over the Arctic, warning that this increases the possibility of colder weather in parts of Europe, North America and Asia in the coming weeks.
This concern could increase the possibility of colder periods in northern and central Europe, including parts of Scandinavia, the British Isles, Germany and Poland.
The polar vortex typically strengthens during the fall, reaching its peak around January, before gradually weakening towards the end of winter. Larger disturbances, which allow Arctic air to penetrate further south than usual, occur most often between January and March.
However, this year scientists noticed signs of disturbance in November, which is a precedent in modern meteorological measurements.
Professor Andrew Charlton-Perez, a meteorologist at the University of Reading, said in an expert commentary published by the university that scientists had never before recorded sudden stratospheric warming so early in the season.
The polar vortex is a large area of low pressure and extremely cold air that circulates high above the Arctic. When it weakens or shifts position, the air current can become unstable, potentially allowing cold Arctic air to penetrate to lower latitudes.
The consequences of such changes may only be felt after a few weeks, when the effects trickle down to the lower layers of the atmosphere where weather systems form. The ultimate impact will also depend on the distribution of high and low pressure areas.
Scientists are also examining the potential impact of the strong El Nino phenomenon developing in the Pacific Ocean, which could affect atmospheric circulation and contribute to polar vortex disturbances.
Climate change is also being considered as a possible factor influencing some of the atmospheric processes involved in these phenomena, although no direct link to the current extremely early disturbance has yet been established.
Meteorologists are continuing to monitor the development of the situation and it is expected that next week they will provide a clearer picture of whether this concern will turn into significant changes in winter weather throughout the Northern Hemisphere.