Conditions atmosphériques associées aux chutes de grêles en Bourgogne.

A network of 96 hail pads is installed in Burgundy since 2014. Hailfalls in this part of France are mainly recorded from Avril to September and usually at the end of the afternoon when the surface air has been warmed enough to trigger an upward lift. Atmospherically speaking, hailfalls in Burgundy are associated with southward winds blowing from the Mediterranean Sea (Gulf of Lions) according to a strong negative barometric anomaly centered over Germany and extended southwestward until the south of Spain. A weak northwestward wind is at the same time also blowing until the northern part of Burgundy creating a thermal air-mass conflict and therefore a convective available potential energy wh…