After the cold drop, omega: This phenomenon explains the weather forecast for the coming days

After the cold drop, omega: This phenomenon explains the weather forecast for the coming days

Way King ShilaClimate scientist

The current climate in Europe will be suspended until the end of August or perhaps the first week of the school year. This situation will bring the prevailing bad weather in the countries of Central Europe, while in Western Europe as well, so the climate will be mild despite the gray and warm weather in France. An explanation of the causes and consequences of this development, especially the weather you can expect in our country.

The weather in France promises to be good for at least 8 days, making holidaymakers happy at the end of August. During thunderstorms in the mountains, especially in the southern Alps, we observe local shades of gray in the northeastern regions. Temperatures are sometimes lower than the seasonal average north of the Lower, but southern summers of the country.

A climate block in “Omega”

The situation we see this week, in weather parlance, is called the “omega barrier”, which is similar to the curves made by a jet stream at a height of from the Greek letter. In fact, the jet stream regulates air mass, depression, and anticyclones by regulating atmospheric circulation through normal fluid and linear motion. However, sometimes the jet stream slows down and bends like a low-flowing river. As the weather freezes, these curves may be blocked.

Sometimes severe weather effects

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You should know that an “omega” prevents everything like depression around a high pressure block. Because these barriers last a long time, depending on the areas involved, they can cause extreme weather events when they occur. This summer, we have witnessed a number of setbacks and severe repercussions. This phenomenon occurred in western Canada in late June and early July: a large amount of hot air was constantly taped into British Columbia and neighboring states causing unprecedented heat waves and drought. In June, another hurricane struck western Europe, causing a cold spell in the Benalux countries and Germany, causing unusual flooding in these areas. It also happened in August in the Mediterranean, resulting in what we called the “hot dome”.

What will happen in Europe in the coming days?

To date, the high pressure block of Omega has become the British Isles. It blows hot air into Iceland, where it is temporarily warmer than northeastern France, around 25 ° C for a few days. At the same time, very fresh air is coming down from Scandinavia to Central Europe and Benelux. In Central Europe, this fresh air will increase the extent of depression, “he said. Cold drip , With the hopefully stormy rain. Countries from Poland to Germany, Austria and northern Italy are expected to experience heavy and prolonged rains until Sunday for fear of possible floods. France, which is under the influence of anticyclones, will benefit from the calm and generally pleasant climate, with the temperature difference between the Northeast being cooler for the season and subject to the summer and summer temperatures. In addition to the generally dry climate, this barrier will not directly affect our country.

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What would have happened if the barrier had been placed differently?

It is interesting to note that this type of interruption only occurs in 20 to 30% of cases during the summer, so it rarely persists. But when that happens, the consequences are devastating. Thus, the great European and French heat wave of August 2003 originated from this type of configuration, as did the June heat wave in British Columbia. Omega is found mostly in Central Europe, bringing hot air to France, resulting in more than 10 consecutive days of historic heat.

If this configuration is rare in the summer, it is more likely to be repeated in September and October, when good weather will prevail in France with the feeling of a “beautiful late season”. However, this is due to the rise of humid Mediterranean air in the south-eastern part of our country, which creates sevens episodes. When such a disturbance occurs in winter, it is responsible for the dry weather with a lot of fog and low clouds in the plains, while in the mountains it is beautiful and mild. In this case, there is no snow, and winter sports resorts are frustrated. Finally, when the barrier is in place, it is responsible for the large cold waves that descend from the Arctic in the winter, on the North Sea or Scandinavian side, as they do now, during the great winter of the 20th century.

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As we can see, these blocking conditions are always accompanied by significant weather effects and indicate a temporary weakening of the jet stream. In recent years, if these configurations have occurred repeatedly, there is nothing to suggest that they are related to contemporary global warming, as noted by Robert Voutard, a researcher at the Climate and Environmental Laboratory. (LSCE), in Interview.

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