Weather report. Strong thunderstorms and hail in the Loire before a radical change in weather

The Loire has been placed on yellow alert for storms by Météo France this Friday June 28 and Saturday June 29, 2024 from 3 to 9 p.m.

“The first outbreaks of storms are expected early this afternoon in Auvergne. They will then progress towards the west of Rhône-Alpes and then the Saône valley,” explains Keraunos, a storm and tornado observatory.

A risk of supercell thunderstorms

The supercellular risk is marked with heavy hail possible and occasional but vigorous gusts of wind.

The significant risk of thunderstorms then shifts to the Jura at the end of the day. By the end of the evening, convective activity should cease in the area. A very localized violent thunderstorm, due to the hail produced, is not totally excluded.

The town of Saint-Étienne is exposed today and next night to a risk of sometimes strong thunderstorms, with the probability of thunderstorms considered high.

The potential for severe hail (diameter greater than 5 cm) is very low, and the predicted tornado risk is very low.

Significant accumulations of rain between the Vivarais plateau and Pilat

This Friday, non-generalized storms are developing mainly on the relief of the Massif Central. They could be very slow to move and produce hail, high rainfall intensities of up to 40-60 mm in a very short time, resulting in significant accumulations of rain between the Vivarais plateau, Pilat and the Loire Valley on the Haute-Loire side.

This Saturday: rainy and stormy situation across the entire region, with possible hail, heavy rain and strong gusts of wind during thunderstorms in the afternoon and late afternoon.

Even though the entire region is affected, the deterioration is organized in two privileged sectors:

• Auvergne to the west and from the lower Rhône valley to the Jura and Alps massifs to the east.
• In the northwest of Rhône-Alpes, the southerly wind could work favorably to reduce the risk of storms.

For these two days, the situation must be monitored in real time and could raise the level of vigilance locally.

A cooling coming

Maximum temperatures will also drop in parallel, noticeably, sometimes by more than 10 degrees in places at the end of the week.

And the start of next week will see the return of slightly timid temperatures for the start of July under the influence of ocean winds, warns Météo France.

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