Meteorological winter is fast approaching and experts are specifying what kind of weather the world is waiting for. It seems that we can look forward to a real cold from the very beginning of December. The polar vortex changes its behavior and according to meteorologists, this will show its strength, writes the portal.
Although this phenomenon will mainly affect the USA, it will also be felt in Europe. A lower polar vortex should move over North America, creating a special phenomenon known as the cross-polar current, when it attracts cold air from the polar region.
Current weather developments in the North Pacific and North America are very dynamic. Pressure anomalies are created in the regions as the atmosphere tries to balance the temperature differences between the cold poles and the warm tropics. A so-called jet flow is created in the middle of this anomaly, which drives and affects pressure systems, thereby directly affects weather changes. This phenomenon is behind extreme events, from cold spells and floods to heat waves and droughts.
However, the winter weather is mainly affected by the polar vortex, the core of which is currently over Canada and the northern United States. The flow of cold air therefore pushes to the south. Meteorologists expect a greater cooling than usual on Thanksgiving Day, which is celebrated on the last Thursday of November, i.e. November 28. In early December, cold air should begin to spread to the east.
While the core of the polar vortex is located over North America, for Europe in general this means a high pressure scenario. The forecast of the temperature anomaly over Europe shows that in the first week of December, temperatures below the high pressure area will be higher than normal. The anticyclone is rotating and will bring some northerly flow to the central and southern to southeastern parts.
In mid-December, meteorologists estimate above-normal temperatures associated with warmer westerly flow from the Atlantic low pressure anomaly region. The weather for the holidays and the end of the year will depend on pressure anomalies.
