It is one of the two significant events of the weekend from a weather point of view. Besides storms Many and potentially strong, temperatures will experience a spectacular drop. They will both back down in very important proportions but also in a very short time.
In the northern half of France, they will lose between ten and fifteen degrees by Sunday. A first decline will take place on Saturday with a drop of a few degrees, locally up to 5 ° C. On Sunday, compared to the day before, temperatures will tumble about a dozen degrees in certain regions.
In the case of Strasbourg (Bas-Rhin), 27 ° C are expected this Friday at the hottest moment of the day. It should be 24 ° C on Saturday. On Sunday, the counter should cap at only 12 ° C. In this case, this will be a decline of 15 ° C in 48 hours, including 12 ° C in only 24 hours between Saturday and Sunday. In Paris, the situation will be almost the same. In the capital, after the 29 ° C of this Friday afternoon, it should be 24 ° C on Saturday and 16 ° C on Sunday, a fall of 13 ° C during the weekend.
Air of polar origin
In the northwest of the country, the difference will be slightly less. Cities like Rouen (Seine-Maritime) or Rennes (Ille-et-Vilaine) will lose ten degrees over the period, from around 25 ° C to just over 15 ° C. In the southern half of France, the change will be a little less brutal. On the one hand, maximum temperatures from the middle of the week rise lower than in the north of the country, on the other hand, the decline will be less strong. This is how Bordeaux (Gironde) will go from 27 ° C to 20 ° C, which Montpellier (Hérault) will lose only 3 ° C, going from 22 ° C to 19 ° C, and Nice (Alpes-Maritimes) go from 22 ° C to 20 ° C.
The cause of this express change is to be found in a modification of the circulation of the air mass. While the heat found its origin in the south of Europe and north of Africa, the air that will arrive in France during the weekend is of polar origin. He will be more present in the north of France than in the southern half, which explains a lower drop in temperatures in the south of the Loire.
This animation made with Weather allows you to view the situation. This is the evolution of the air mass at an altitude of 1500 m between this Friday and Monday, according to the meteorological model Arpège, from Météo France.
With maximum oscillating around 30 ° C in certain regions, temperatures have exceeded seasonal averages a dozen degrees in places in recent days. The situation at the end of the weekend will actually be close to normal in most of the country.
Similar temperatures next week
In the southern half, with values between 17 ° C and 20 ° C, the thermometer will be either in the average, or 2 ° C or 3 ° C under it. In the northwest and north, with fifteen degrees, even a little more, the maximums will be there so close to the averages in early May.
It is in Île-de-France and especially in the Northeast, two of the places in the country where the drop in temperatures will be the most pronounced between Friday and Sunday, that the gap with the standard will be the most pronounced. In the capital region, it should make 3 ° C at 4 ° C less than waiting for this period of the year. In Alsace and near the Belgian and Luxembourg borders, the difference with standards could reach -5 ° C at -7 ° C.
Until the midst of next week, temperatures should remain quite similar to the situation at the end of the weekend. They will tend to lower a little more in the southern half of France. The maximums will revolve around fifteen degrees throughout the country, between 15 ° C and 20 ° C in the southern regions of France.
