After the storms of Friday evening, the atmosphere remains unstable in the south of France: a new stormy degradation concerns until Sunday morning all the regions extending from the east of the Pyrenees to the Alps to the Mediterranean. These thunderstorms are linked to a conflict of air masses, between fresh oceanic air and tropical air upwelling over the south of France. As a result, thunderstorms are rapidly circulating over these southern regions. They are generally brief but can lead to occasional violent phenomena, such as hailstorms and heavy rainfall in a few minutes. As a result, thunderstorms are rapidly circulating over these southern regions. They are generally brief but can lead to occasional violent phenomena, such as hailstorms and heavy rainfall in a few minutes.

In recent hours, thunderstorm activity has clearly increased in Languedoc-Roussillon and especially in the south of the Alps. In Narbonne (11), a gust reached 86 km / h when a brief thunderstorm passed. Between 3 p.m. and 6 p.m., 47.5 mm of rain fell in Aups (83) under a violent storm. At 3 p.m., the rain-storm axis developed well between Occitanie and Auvergne, giving heavy rain intensities locally. Ahead of the disturbance, localized but violent thunderstorms began to form over the southern Alps, accompanied by significant electrical activity and some hailstorms. In Aups (83), 26.7 mm of rain fell between 3 p.m. and 4 p.m., the equivalent of 2 weeks of precipitation. In Montclar (04), in the same period of time, 19 mm of rain had just been collected. At 12 o’clock, the rain-storm disturbance took hold from the Pyrenees to the Alps with occasional heavy downpours, especially in the Hautes- Pyrenees, Cantal and Pyrénées-Orientales.

Tonight
The pluvio-stormy axis progresses towards the east and stretches from the Cévennes to the Alps. Rain intensities will sometimes be strong in the Alps with a risk of runoff and flooding in low points. The Mediterranean regions, and in particular the PACA, are affected by thunderstorms which will circulate very quickly which may occasionally prove to be virulent. It is at the end of the night and the beginning of the morning of Sunday that the thunderstorms will evacuate beyond our borders and that this special press release will be lifted, at the latest at 9 am.
During this episode, we wait
– strong electrical activity
– cumulative rainfall between 20 and 50 mm, sometimes in less than 1 hour and corresponding to 10-15 days of rain with a risk of very locally reaching 50 mm
– locally strong hailstorms.
– strong gusts of wind between 60 and 80 km / h.

This situation requires increased vigilance, especially on road networks where visibility will sometimes be reduced to less than 50 m. Due to the risk of aquaplaning, it will be imperative to reduce your speed.

Every Thursday, the 4-week weather trend is updated. The latter, which covers the rest of the summer vacation, presents the most likely weather scenario for the next four weeks until August 29.

The supporters of the first week will have no better luck than those of the beginning of July: the weather promises to be permanently disturbed, gloomy and rainy, with a fall weekend in prospect. Hello summer?

If most Julyists were not spoiled by the weather during their holidays, can future holidaymakers in August hope for the return of good summer weather for the first ten days of August?

Ref: https://actualite.lachainemeteo.com