Metropolitan France is preparing for violent storms this Saturday, June 29, 2024. The northeast of the country is particularly at risk. Where do these violent and sudden storms come from?
Violent storms affect a large part of mainland France. After a very summery week across the country, Météo-France anticipates a deterioration in the weather and the installation of a “ severe storm situation » this Saturday, June 29, 2024. While France had finally experienced temperatures worthy of a summer, where does this risk of such violent storms come from? The occurrence of a storm after an episode of high heat is not that rare.
In meteorology, a thalweg is a barometric trough, located between two high pressure zones. The trough, of lower pressure, extends from the depression, forming a sort of V on weather maps.
« A short-wavelength high-altitude trough, associated with a cut-off [ndlr : dépression froide isolée] which rises from Spain towards the north-east of the country will cause severe stormy degradation this Saturday “, indicates Keraunos, the French observatory of tornadoes and violent storms, in its forecast bulletin.
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The rise of the cut-off from Spain, which will “merge” into a thalweg, is a situation which ” will create an extremely unstable and dynamic air mass “, comments Guillaume Jauseau, meteorologist for Météo-Contact, on X.
The north-east of France is particularly prone to the risk of violent thunderstorms, “ due to the hail potential on the one hand and the wind potential on the other hand “, according to Keraunos. On the northeast, ” the development of supercell thunderstorms is expected “, adds Guillaume Jauseau.
31 departments are on orange alert for thunderstorms in France this Saturday
But we should expect strong storms in other regions as well. 31 departments are placed on orange alert this Saturday by Météo-France. Hail is possible, as well as gusts exceeding 100 km/h, estimates Keraunos.
In the event of violent storms like those forecast in France this weekend, it is recommended to follow several tips. You must take shelter quickly as soon as the storm rumbles, to avoid being struck by lightning. Stay in shelter for at least 30 minutes after hearing the last clap of thunder », conseille Keraunos.
Even when sheltering at home, there are also good practices during a storm. So, it is better not to take a shower during a storm. Some also prefer to unplug their box in the event of a storm and avoid using the television and computer. Obviously, it is preferable not to take the car and to avoid driving in the event of a storm.
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