The summer time is only a distant memory. After temperatures around 30 degrees in places, with 28 ° C identified on the side of Avignon on Thursday, May 1, this end of the weekend is marked by unstable and sullen weather. A trend that will continue at the start of next week.
A drop in temperatures up to 10 degrees
If hail does not seem to be on the program for the time being, unlike Paris, showers, thunderstorms and notable drop in temperatures are however to be expected this Sunday evening, causing a decrease of 10 degrees in certain French and Provencal cities. A radical change in advanced situation by The weather channel Linked to the phenomenon called “Thalweg”, which means in German “Chemin de Vallée”.
The “Thalweg” is a “Deputy hollow”linked to the cold air descent from the north, which makes the heat gradually generate an increasingly uncertain time, explains Météo France.
In geography, a thalweg is a line that joins the lowest points of a valley; “The Thalweg of a valley is therefore opposed to the crest line between two valleys. By analogy between the level lines (lines joining the points of the same altitude) of a hiking card and the isobares (lines joining the equal atmospheric pressure points) of a weather card, a thalweg is meteorology an axis of low pressure”, specifies Météo-France on its site.
In short, who says Thalweg often says rains and thunderstorms, we must therefore plan the umbrella and put away shorts this Monday! In Marseille this Monday, May 5, the weather will be cloudy with risks of showers and the thermometer will display 19 degrees at the highest, almost 10 degrees less compared to Thursday May 1 and Friday May 2. In Aix-en-Provence, it will be 18 degrees at the highest. Same thing for Avignon, who nevertheless approached 30 degrees a few days ago …
