Par
Timothy the Angevin
Published on
Barely dissipated and already back. From this Friday, July 18, 2025, and after a weekend of July 14 marked by torrential rains, A new salvo of thunderstorms will strike the country. These thunderstorms “Advocals are violent”insist withactu.fr Yann Amice, meteorologist and site founder Weathernco.
Upcoming instability
This mid -week should be quite stable, with high pressure conditions offering a generous sun for almost everyone. But an altitude talweg from the West will disturb the air masses in place, causing strong instability.
What is an altitude talk?
An altitude (or barometric hollow) talweg is an area in height where air is colder and less stable than in neighboring regions. This situation promotes the rise of hot and humid air from the ground.
When this air rises, it cools, condenses, and forms stormy clouds. This is how Talweg can trigger thunderstorms, sometimes violent.
Probable violent phenomena
“We are going to have a stormy activity all over the Atlantic facade on Friday, with violent thunderstorms, points Yann Amice. They will continue in the night and the morning on Saturday, and shift east as the Talweg is progressing in the country. »»
If the deadline is still a bit distant to determine where the thunderstorms will fall, they should save few regions in France. But it is probably the southwest of the country which will be most affected by probable violent phenomena (hail, strong gusts, torrential rain, intense electrical activity).
Thunderstorm forecasts between Friday and Saturday, depending on the European ECMWF model (Météologix card). The more the color turns to purple, the greater the risk of violent phenomena:
Sunday, rain and more thunderstorms
For Sunday, the rain will win the country.
During the night from Saturday to Sunday, a new wave, with a second talweg, will reach our territory. This very classic disturbance will bring important accumulations of rain throughout the country.
You could reach cumulation of around 30 to 40 mm of precipitation. “A humidity that will not hurt our very dry floors. »»
However, this instability will reactivate thunderstorms in the southern half of the country.
Towards a return of the hot weather before the end of the month?
From the beginning of next week, the weather should be released under the influence of a anticyclonic backbone (Extension of one anticyclone to another region, which manifests itself by an area of high pressure, generally bringing calm, dry and sunny time).
Yann Amice does not exclude a return of hot weather by the end of the month.
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