How can I see the breezes in the Annecy region?
A short reminder of how valley breezes work
Let’s remember that valley breezes are linked to the accumulation of slope breezes on the scale of a massif. To do this, let us first review the slope breezes:
Under the action of the sun’s rays, the ground heats up and communicates this heat by conduction to the air on that side of the relief (the eastern side in the morning for example). The warm air rises in an ascending current, which follows the slope of the mountain: this is the rising slope breeze, or anabatic wind. This rising air is replaced by colder air from the middle of the valley or from a slope not exposed to the sun. These breezes can reach 15 to 30kmh.
The valley breeze therefore rises during the day and falls at night.
The wind can sometimes reinforce or counteract it. It can sometimes be so strong that it will prevent paragliders from flying.
In Annecy, the layout of the mountain ranges makes it easy to understand the breezes that develop.
Between confluences, strategic thermal or dynamic points, read the map in detail to analyse each massif!