A significant temperature drop is expected in the Alps, with a cooler air mass arriving over the next few days, leading to a decrease of 10 to 15°C. This change will bring a return of snow in the Northern Alps, with snowfall potentially occurring as low as 1600 to 1800 meters in altitude on Thursday. The shift in weather will be accompanied by a change in wind direction to the north and northwest, bringing cooler air over France. Temperatures will temporarily fall below seasonal norms starting Thursday, with a noticeable decrease at higher altitudes in the mountains, as the 0°C isotherm lowers. The isotherm refers to the line on a weather map where the temperature is exactly 0°C, marking the boundary between rain and snow. In the Alps, the rain-snow line is expected to drop to around 1800 to 2000 meters on Thursday, or even as low as 1600 to 1800 meters in the Northern Alps. Under sustained precipitation, the isothermal effect could cause snowflakes to fall slightly lower. This means that snow might reach lower elevations than usual, making it more visible in areas that typically see less snowfall. However, this return of snow is expected to be brief, with temperatures rising again starting Friday, especially over the weekend, as pressure increases and the 0°C isotherm rises, limiting snow to the highest peaks. The weather pattern suggests a temporary shift toward colder conditions, which may affect local activities such as skiing and hiking. As temperatures rise again, the snow cover will likely retreat to higher altitudes, returning to more typical seasonal patterns.