Météo France predicts heavy precipitation this week, linked to a mass of hot air causing a phenomenon called atmospheric river. Explanations!
After the intense summer heat, comes the time for continued fall precipitation. Last month, Meteo France also confirmed that France had never seen so many rain fall from the sky “over the last few weeks”. So much so that between October 18 and November 12, nationally, “an average accumulation of 215.4 mm” had been recorded. An amount “never measured” ! In addition to the various storms which caused damage, including Ciaran and Domingos, a little-known phenomenon is now crossing the metropolis. Indeed, Meteo France indicates in various press releases that a “atmospheric river“ involving heavy rains has already reared its ugly head.
It will rain a lot in the coming days in the central regions, from the Atlantic coast to the Alps. So much so that meteorologists decided to place nine departments in orange vigilance heavy rain and floods from Monday December 11. “Locally very heavy precipitation accumulations over the Alps, with significant associated snowmelt”we also warn, to encourage residents to take precautions.
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Extremely mild temperatures for the season
This “atmospheric river” also called “Express rum” extends over a wide band of “200 to 400 kilometers” (The Weather Channel). It is actually a large mass of warm air which, once it reaches temperate regions, transforms into rain. “By colliding with cooler air, a depression will deepen and cause an active disturbed system which will dump heavy, lasting precipitation over a fairly geographically restricted continental area”explains meteorologist Cyrille Duchesne to BFM TV. “Atmospheric rivers play an important role in the transport and distribution of moisture from the tropics to temperate and polar latitudes”he adds, ensuring thatthey can be beneficial in some cases “by bringing regular rains for nature”.
But they are also likely to generate “more or less severe bad weather with heavy rain or snowfall, floods and floods” And “violent winds”. This is what could happen in France this week. Thus, 150mm of rain is expected between Tuesday December 12 and Wednesday December 13 in the departments of Haute-Savoie and Isère. This Tuesday, December 12, ten departments remain placed on orange vigilance: Savoythere Haute-SavoieTHE Two SevresTHE BatchL’Isèrethere Corrèzethere Dordognethere Girondethere Charentethere Charente Maritime.
On the other hand, temperatures remain mild for the season. They are even higher than normal in certain areas around the Mediterranean. It should be up to 20°C in Perpignan today. At the start of the week, a record for the month of December was even recorded in the Alpes-Maritimes, more recently in Cannes (23.8°C).
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