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The article discusses the meteorological phenomenon known as « épisodes cévenols, » which affect the southern part of France. These events are particularly violent storms that bring heavy rainfall to the region. They are caused by the meeting of a cold air mass from the north and a hot air mass from the south, which creates an unstable atmosphere. The mistral wind, which blows from the north, can also contribute to the intensification of these storms.
In response to the question, épisodes cévenols are violent storms that bring heavy rainfall to the southern part of France, caused by the meeting of cold and hot air masses and potentially intensified by the mistral wind.