Following the precipitation that occurred on Wednesday August 4, from the Pyrenees to the Alps, where it fell in some places the equivalent of three weeks of rain, further degradation will affect a large part of France on Saturday August 7.
The Bourgogne-Franche-Comté and Auvergne-Rhône-Alpes regions will be particularly affected, announces La Chaîne Météo *.
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This new pluvio-stormy degradation occurs because of the arrival, in the West, by the Bay of Biscay, of a cold air piloted by a strong depression stagnating on the British Isles, and a mass of hot air rising from the Mediterranean.
This meeting will promote the formation of a disturbance in the southwest of the country, from the end of the night of Friday 6 to Saturday 7 August.
This disturbance will then move towards the central massif, the Rhône valley and finally Franche-Comté.
This degradation is manifested during a new crossover day classified as "
black
" by Bison Futé in the direction of the departures.
Six departments are placed on orange “storm” alert.
The Weather Channel
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On Saturday morning, the weather will become more and more stormy from 9 a.m.
Heavy rains will fall from the north of the Massif Central to New Aquitaine.
With hourly intensities of 10 to 15 mm, they will significantly reduce visibility.
The rains will intensify from 9 am on the north of the Massif Central, becoming more and more stormy.
Saturday afternoon, this disturbance will gradually shift to the east of the country, from the middle Rhône valley to Alsace, via Franche-Comté.
Thunderstorms will be recurrent.
On Saturday evening, the rains falling on the northeast of the country will quickly recede, from 8 p.m., towards our German neighbor.
This development will be slower in the south of France, in particular for the Rhône-Alpes region.
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This rainy episode will cause, in the east of the country, in the Auvergne-Rhône-Alpes and Bourgogne-Franche-Comté regions, a strong electrical activity, average accumulations of precipitation between 20 and 40 mm, with in some places rainfall of sometimes 15 mm in less than 1 hour, and a risk of accumulations close to 50 mm in the departments of Ain, Doubs, Isère, Jura, Rhône and Territoire de Belfort, corresponding to 3 weeks of rainfall .
* The Weather Channel is owned by the Figaro group.