North America is being prepared for a sharp change in the weather. According to the latest forecasts they will bring the first days of September Rare current of cold polar air from the Arctic to the US and Canada. This phenomenon is associated with the unusually weak beginning of the development of a polar whirl, which may have a fundamental impact on the weather in the coming weeks and in Europe, lists the portal.
August closed a meteorological summer and early September A significant drop in temperatures in the central, southern and eastern USA is expected. Predictions show that this is where there is a strong influx of cold air from polar areas while Western Canada will experience warmer conditions under the influence of pressure existing.
The synoptic situation will create tzv. cross-polar flow – a stream of air that passes directly through the North Pole to North America. This phenomenon is usually associated with the winter months, but this year comes unusually early. Cold and dry air from the Arctic will cause unusually low temperatures in the first half of September And the change from summer to autumn character of the weather.
The polar vortex plays a key role in the formation of winter weather, especially for North America, less for Europe. The weaker polar vortex often brings more unstable jet jet stream (nozzle flow), allowing the cold Arctic air to penetrate deeper south. Current models suggest that pressure anomalies are already disrupting its development in the first days of September, which can lead to a weakening of the vortex throughout the autumn.
Long -term forecasts count on the persistent dynamic character of the weather. Above North Canada, a low pressure area should be maintained, while Western Canada will remain under the influence of warm anticyclone. The northeast of the US and the large lakes are expected to face lower temperatures, while the rest of the country will have milder conditions.
At the same time, a weak polar vortex can prepare the soil for interesting weather development during the winter. Meteorologists point out that if this trend is confirmed, winter 2025/26 could be cooler and bring more snow than usual.
