Storms: eight departments of Rhône-Alpes in orange vigilance

This Saturday, July 29 will be characterized in particular by gloomy weather in the center-east of the country with thunderstorms that can potentially be significant. Eight departments are also placed on orange alert: Loire, Rhône, Ain, Savoie, Haute-Savoie, Ardèche, Drôme and Isère.

A very active storm line will sweep through all of these departments between the afternoon and the middle of the night from Saturday to Sunday. thunderstorms will be accompanied by very high rainfall intensities (around 30 to 40 mm/h), significant electrical activity, possibly hail and, to a lesser extent, gusts.

Conversely, the South should continue to benefit from the sun’s rays according to the forecasts of Météo-France. Low clouds will be present in the morning over the Languedoc plain up to the Côte d’Azur before quickly dissipating.

The sunshine will then be generous throughout the day from Languedoc-Roussillon to the Paca region and Corsica even if high clouds will pass at times and an isolated shower will be possible on the south of the Alps.

Further north, the sky will be very cloudy in the morning, cloudy periods will be frequent, bringing a few showers, which can take on a stormy character over the Massif Central, Franche-Comté. In the afternoon, the clearings will be wider north of an axis going from Biarritz to Strasbourg, the showers will be wider and wider.

Instability will be reinforced from the Pyrenees towards the Massif Central, the north of the Alps, the Jura. Storms will break out in the Rhône-Alpes region and Auvergne, they could give significant accumulations of rain, good gusts. The south-westerly wind will be sensitive along the Channel coasts, the tramontane will rise in the evening.

At daybreak, temperatures will be around 14 to 21 degrees from the interior of Brittany towards the Mediterranean shore and Corsica. The maximum will be without excess: 18 to 20 degrees along the Channel coast, from 21 to 25 on the northern half of the country, from 26 to 30 further south with peaks up to 32 or 33 along the valley of the Rhone.