Although the meteorological autumn has already started, thermometers still hold about 30 degrees Celsius. People still enjoy the last hot rays and short sleeves, but meteorologists have their eyes ahead for the upcoming winter. Experts focused on the arrival of La Niña, which is already developing in the Pacific Ocean. As the portal writes, This phenomenon will affect the winter on the whole of Earth.
La Niña is a cool phenomenon in a large Enso area (a phenomenon that affects globally weather), which is located in the equatorial part of the Pacific Ocean. This area varies between warm and cold stages approximately every 1 to 3 years. The warm phase is called El Niño and the cold phase is called la niña.
The NOAA CRW (the US Ocean Watching Ocean Organization) has published the latest analysis of ocean temperature deviations. It shows that in the middle and eastern parts of the EnSo area, the surface waters are cooler than normal. These cooler places have the shape of the waves. The reason is the strong eastern wind that pushes the water to the west, while the whirlpool and movements on the ocean surface arise.
This is an early beginning of cooling, which should be fully formed into a weak but significant phenomenon of La Niña in the upcoming winter season. By changing the circulation, ENSO significantly affects tropical rainfall and pressure models, thereby changing the feedback system between the atmosphere and the ocean. This feedback system helps to spread the influence of ENSO globally, thereby They change winter temperature and snow models.
The La Niña phenomenon should work during autumn and winter, but at that time it is expected to weaken, and next year there is an expected transition to the warm phase. Its influence is usually manifested by the United States and Canada, where it has a direct impact. Europe is not known for any specific or direct influence because it is too far away from the source. However, this does not mean that it has no effect.
The main impact of these ocean anomalies can be observed In changing air flows in higher layers of atmosphere, the so -called Jet Stream (a sharp wind of approximately 8-11 km), which behaves like an atmospheric river.
New forecasts depict an anomaly of snow showers, which means that they show areas where more (or fewer) snowfall is expected than usual. If there is less snow in some area than usual, it does not mean that there will be no snow, but less snow is expected than usual.
According to the ECMWF model from November to January, below -average snow showers are waiting for Europe. In some parts of Scandinavia, more snow is expected than normal. In the central parts, the snowfall deficit breaks a bit, but it is interesting that more snow is predicted over the southern region of the United Kingdom.
The December prediction of snow showers shows less snow on most continent than usual. The area with more snowfall is located above the Middle Balkans, the extreme south of the United Kingdom and a small part of Scandinavia.
According to January predictions, the potential of snowfall on most continent is increasing. It looks like an anomaly of high air pressure above the north, which brings cooler air to the continent. The increased potential of snowfall is manifested in the United Kingdom and in the central parts.
